From 2917057da81c7d815551c82c9d220f15bef4a53e Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Fri, 6 Feb 2026 18:08:30 +0100
Subject: [PATCH 01/10] [analyze-memory] Trace CSWTCH switch table symbols to
 source components (#13798)

Co-authored-by: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
---
 esphome/analyze_memory/__init__.py | 217 ++++++++++++++++++++++++++++-
 esphome/analyze_memory/cli.py      |  50 +++++++
 esphome/analyze_memory/const.py    |  13 +-
 3 files changed, 267 insertions(+), 13 deletions(-)

diff --git a/esphome/analyze_memory/__init__.py b/esphome/analyze_memory/__init__.py
index 63ef0e74ed..d8c941e76f 100644
--- a/esphome/analyze_memory/__init__.py
+++ b/esphome/analyze_memory/__init__.py
@@ -12,7 +12,6 @@ from .const import (
     CORE_SUBCATEGORY_PATTERNS,
     DEMANGLED_PATTERNS,
     ESPHOME_COMPONENT_PATTERN,
-    SECTION_TO_ATTR,
     SYMBOL_PATTERNS,
 )
 from .demangle import batch_demangle
@@ -91,6 +90,17 @@ class ComponentMemory:
     bss_size: int = 0  # Uninitialized data (ram only)
     symbol_count: int = 0
 
+    def add_section_size(self, section_name: str, size: int) -> None:
+        """Add size to the appropriate attribute for a section."""
+        if section_name == ".text":
+            self.text_size += size
+        elif section_name == ".rodata":
+            self.rodata_size += size
+        elif section_name == ".data":
+            self.data_size += size
+        elif section_name == ".bss":
+            self.bss_size += size
+
     @property
     def flash_total(self) -> int:
         """Total flash usage (text + rodata + data)."""
@@ -167,12 +177,15 @@ class MemoryAnalyzer:
         self._elf_symbol_names: set[str] = set()
         # SDK symbols not in ELF (static/local symbols from closed-source libs)
         self._sdk_symbols: list[SDKSymbol] = []
+        # CSWTCH symbols: list of (name, size, source_file, component)
+        self._cswtch_symbols: list[tuple[str, int, str, str]] = []
 
     def analyze(self) -> dict[str, ComponentMemory]:
         """Analyze the ELF file and return component memory usage."""
         self._parse_sections()
         self._parse_symbols()
         self._categorize_symbols()
+        self._analyze_cswtch_symbols()
         self._analyze_sdk_libraries()
         return dict(self.components)
 
@@ -255,8 +268,7 @@ class MemoryAnalyzer:
                 comp_mem.symbol_count += 1
 
                 # Update the appropriate size attribute based on section
-                if attr_name := SECTION_TO_ATTR.get(section_name):
-                    setattr(comp_mem, attr_name, getattr(comp_mem, attr_name) + size)
+                comp_mem.add_section_size(section_name, size)
 
                 # Track uncategorized symbols
                 if component == "other" and size > 0:
@@ -372,6 +384,205 @@ class MemoryAnalyzer:
 
         return "Other Core"
 
+    def _find_object_files_dir(self) -> Path | None:
+        """Find the directory containing object files for this build.
+
+        Returns:
+            Path to the directory containing .o files, or None if not found.
+        """
+        # The ELF is typically at .pioenvs/<env>/firmware.elf
+        # Object files are in .pioenvs/<env>/src/ and .pioenvs/<env>/lib*/
+        pioenvs_dir = self.elf_path.parent
+        if pioenvs_dir.exists() and any(pioenvs_dir.glob("src/*.o")):
+            return pioenvs_dir
+        return None
+
+    def _scan_cswtch_in_objects(
+        self, obj_dir: Path
+    ) -> dict[str, list[tuple[str, int]]]:
+        """Scan object files for CSWTCH symbols using a single nm invocation.
+
+        Uses ``nm --print-file-name -S`` on all ``.o`` files at once.
+        Output format: ``/path/to/file.o:address size type name``
+
+        Args:
+            obj_dir: Directory containing object files (.pioenvs/<env>/)
+
+        Returns:
+            Dict mapping "CSWTCH$NNN:size" to list of (source_file, size) tuples.
+        """
+        cswtch_map: dict[str, list[tuple[str, int]]] = defaultdict(list)
+
+        if not self.nm_path:
+            return cswtch_map
+
+        # Find all .o files recursively, sorted for deterministic output
+        obj_files = sorted(obj_dir.rglob("*.o"))
+        if not obj_files:
+            return cswtch_map
+
+        _LOGGER.debug("Scanning %d object files for CSWTCH symbols", len(obj_files))
+
+        # Single nm call with --print-file-name for all object files
+        result = run_tool(
+            [self.nm_path, "--print-file-name", "-S"] + [str(f) for f in obj_files],
+            timeout=30,
+        )
+        if result is None or result.returncode != 0:
+            return cswtch_map
+
+        for line in result.stdout.splitlines():
+            if "CSWTCH$" not in line:
+                continue
+
+            # Split on last ":" that precedes a hex address.
+            # nm --print-file-name format: filepath:hex_addr hex_size type name
+            # We split from the right: find the last colon followed by hex digits.
+            parts_after_colon = line.rsplit(":", 1)
+            if len(parts_after_colon) != 2:
+                continue
+
+            file_path = parts_after_colon[0]
+            fields = parts_after_colon[1].split()
+            # fields: [address, size, type, name]
+            if len(fields) < 4:
+                continue
+
+            sym_name = fields[3]
+            if not sym_name.startswith("CSWTCH$"):
+                continue
+
+            try:
+                size = int(fields[1], 16)
+            except ValueError:
+                continue
+
+            # Get relative path from obj_dir for readability
+            try:
+                rel_path = str(Path(file_path).relative_to(obj_dir))
+            except ValueError:
+                rel_path = file_path
+
+            key = f"{sym_name}:{size}"
+            cswtch_map[key].append((rel_path, size))
+
+        return cswtch_map
+
+    def _source_file_to_component(self, source_file: str) -> str:
+        """Map a source object file path to its component name.
+
+        Args:
+            source_file: Relative path like 'src/esphome/components/wifi/wifi_component.cpp.o'
+
+        Returns:
+            Component name like '[esphome]wifi' or the source file if unknown.
+        """
+        parts = Path(source_file).parts
+
+        # ESPHome component: src/esphome/components/<name>/...
+        if "components" in parts:
+            idx = parts.index("components")
+            if idx + 1 < len(parts):
+                component_name = parts[idx + 1]
+                if component_name in get_esphome_components():
+                    return f"{_COMPONENT_PREFIX_ESPHOME}{component_name}"
+                if component_name in self.external_components:
+                    return f"{_COMPONENT_PREFIX_EXTERNAL}{component_name}"
+
+        # ESPHome core: src/esphome/core/... or src/esphome/...
+        if "core" in parts and "esphome" in parts:
+            return _COMPONENT_CORE
+        if "esphome" in parts and "components" not in parts:
+            return _COMPONENT_CORE
+
+        # Framework/library files - return the first path component
+        # e.g., lib65b/ESPAsyncTCP/... -> lib65b
+        #        FrameworkArduino/... -> FrameworkArduino
+        return parts[0] if parts else source_file
+
+    def _analyze_cswtch_symbols(self) -> None:
+        """Analyze CSWTCH (GCC switch table) symbols by tracing to source objects.
+
+        CSWTCH symbols are compiler-generated lookup tables for switch statements.
+        They are local symbols, so the same name can appear in different object files.
+        This method scans .o files to attribute them to their source components.
+        """
+        obj_dir = self._find_object_files_dir()
+        if obj_dir is None:
+            _LOGGER.debug("No object files directory found, skipping CSWTCH analysis")
+            return
+
+        # Scan object files for CSWTCH symbols
+        cswtch_map = self._scan_cswtch_in_objects(obj_dir)
+        if not cswtch_map:
+            _LOGGER.debug("No CSWTCH symbols found in object files")
+            return
+
+        # Collect CSWTCH symbols from the ELF (already parsed in sections)
+        # Include section_name for re-attribution of component totals
+        elf_cswtch = [
+            (symbol_name, size, section_name)
+            for section_name, section in self.sections.items()
+            for symbol_name, size, _ in section.symbols
+            if symbol_name.startswith("CSWTCH$")
+        ]
+
+        _LOGGER.debug(
+            "Found %d CSWTCH symbols in ELF, %d unique in object files",
+            len(elf_cswtch),
+            len(cswtch_map),
+        )
+
+        # Match ELF CSWTCH symbols to source files and re-attribute component totals.
+        # _categorize_symbols() already ran and put these into "other" since CSWTCH$
+        # names don't match any component pattern. We move the bytes to the correct
+        # component based on the object file mapping.
+        other_mem = self.components.get("other")
+
+        for sym_name, size, section_name in elf_cswtch:
+            key = f"{sym_name}:{size}"
+            sources = cswtch_map.get(key, [])
+
+            if len(sources) == 1:
+                source_file = sources[0][0]
+                component = self._source_file_to_component(source_file)
+            elif len(sources) > 1:
+                # Ambiguous - multiple object files have same CSWTCH name+size
+                source_file = "ambiguous"
+                component = "ambiguous"
+                _LOGGER.debug(
+                    "Ambiguous CSWTCH %s (%d B) found in %d files: %s",
+                    sym_name,
+                    size,
+                    len(sources),
+                    ", ".join(src for src, _ in sources),
+                )
+            else:
+                source_file = "unknown"
+                component = "unknown"
+
+            self._cswtch_symbols.append((sym_name, size, source_file, component))
+
+            # Re-attribute from "other" to the correct component
+            if (
+                component not in ("other", "unknown", "ambiguous")
+                and other_mem is not None
+            ):
+                other_mem.add_section_size(section_name, -size)
+                if component not in self.components:
+                    self.components[component] = ComponentMemory(component)
+                self.components[component].add_section_size(section_name, size)
+
+        # Sort by size descending
+        self._cswtch_symbols.sort(key=lambda x: x[1], reverse=True)
+
+        total_size = sum(size for _, size, _, _ in self._cswtch_symbols)
+        _LOGGER.debug(
+            "CSWTCH analysis: %d symbols, %d bytes total",
+            len(self._cswtch_symbols),
+            total_size,
+        )
+
     def get_unattributed_ram(self) -> tuple[int, int, int]:
         """Get unattributed RAM sizes (SDK/framework overhead).
 
diff --git a/esphome/analyze_memory/cli.py b/esphome/analyze_memory/cli.py
index 72a73dbdd4..bb0eb7723e 100644
--- a/esphome/analyze_memory/cli.py
+++ b/esphome/analyze_memory/cli.py
@@ -184,6 +184,52 @@ class MemoryAnalyzerCLI(MemoryAnalyzer):
                 f"{i + 1:>2}. {size:>7,} B {section_label:<8} {demangled_display:<{self.COL_TOP_SYMBOL_NAME}} {component}"
             )
 
+    def _add_cswtch_analysis(self, lines: list[str]) -> None:
+        """Add CSWTCH (GCC switch table lookup) analysis section."""
+        self._add_section_header(lines, "CSWTCH Analysis (GCC Switch Table Lookups)")
+
+        total_size = sum(size for _, size, _, _ in self._cswtch_symbols)
+        lines.append(
+            f"Total: {len(self._cswtch_symbols)} switch table(s), {total_size:,} B"
+        )
+        lines.append("")
+
+        # Group by component
+        by_component: dict[str, list[tuple[str, int, str]]] = defaultdict(list)
+        for sym_name, size, source_file, component in self._cswtch_symbols:
+            by_component[component].append((sym_name, size, source_file))
+
+        # Sort components by total size descending
+        sorted_components = sorted(
+            by_component.items(),
+            key=lambda x: sum(s[1] for s in x[1]),
+            reverse=True,
+        )
+
+        for component, symbols in sorted_components:
+            comp_total = sum(s[1] for s in symbols)
+            lines.append(f"{component} ({comp_total:,} B, {len(symbols)} tables):")
+
+            # Group by source file within component
+            by_file: dict[str, list[tuple[str, int]]] = defaultdict(list)
+            for sym_name, size, source_file in symbols:
+                by_file[source_file].append((sym_name, size))
+
+            for source_file, file_symbols in sorted(
+                by_file.items(),
+                key=lambda x: sum(s[1] for s in x[1]),
+                reverse=True,
+            ):
+                file_total = sum(s[1] for s in file_symbols)
+                lines.append(
+                    f"  {source_file} ({file_total:,} B, {len(file_symbols)} tables)"
+                )
+                for sym_name, size in sorted(
+                    file_symbols, key=lambda x: x[1], reverse=True
+                ):
+                    lines.append(f"    {size:>6,} B  {sym_name}")
+            lines.append("")
+
     def generate_report(self, detailed: bool = False) -> str:
         """Generate a formatted memory report."""
         components = sorted(
@@ -471,6 +517,10 @@ class MemoryAnalyzerCLI(MemoryAnalyzer):
                     lines.append(f"    ... and {len(large_ram_syms) - 10} more")
             lines.append("")
 
+        # CSWTCH (GCC switch table) analysis
+        if self._cswtch_symbols:
+            self._add_cswtch_analysis(lines)
+
         lines.append(
             "Note: This analysis covers symbols in the ELF file. Some runtime allocations may not be included."
         )
diff --git a/esphome/analyze_memory/const.py b/esphome/analyze_memory/const.py
index 83547b1eb5..66866615a6 100644
--- a/esphome/analyze_memory/const.py
+++ b/esphome/analyze_memory/const.py
@@ -66,15 +66,6 @@ SECTION_MAPPING = {
     ),
 }
 
-# Section to ComponentMemory attribute mapping
-# Maps section names to the attribute name in ComponentMemory dataclass
-SECTION_TO_ATTR = {
-    ".text": "text_size",
-    ".rodata": "rodata_size",
-    ".data": "data_size",
-    ".bss": "bss_size",
-}
-
 # Component identification rules
 # Symbol patterns: patterns found in raw symbol names
 SYMBOL_PATTERNS = {
@@ -513,7 +504,9 @@ SYMBOL_PATTERNS = {
         "__FUNCTION__$",
         "DAYS_IN_MONTH",
         "_DAYS_BEFORE_MONTH",
-        "CSWTCH$",
+        # Note: CSWTCH$ symbols are GCC switch table lookup tables.
+        # They are attributed to their source object files via _analyze_cswtch_symbols()
+        # rather than being lumped into libc.
         "dst$",
         "sulp",
         "_strtol_l",  # String to long with locale

From f9192b5f75af343a41eb00b1cf82dd9b8380c90a Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Fri, 6 Feb 2026 18:20:46 +0100
Subject: [PATCH 02/10] [wifi] Avoid jump tables in LOG_STR switch statements
 to save ESP8266 RAM (#13799)

---
 esphome/components/wifi/wifi_component.cpp    |  30 ++--
 .../wifi/wifi_component_esp8266.cpp           | 150 ++++++++----------
 2 files changed, 81 insertions(+), 99 deletions(-)

diff --git a/esphome/components/wifi/wifi_component.cpp b/esphome/components/wifi/wifi_component.cpp
index 0fe98162f3..e350f990af 100644
--- a/esphome/components/wifi/wifi_component.cpp
+++ b/esphome/components/wifi/wifi_component.cpp
@@ -236,25 +236,23 @@ static const char *const TAG = "wifi";
 /// │  - Roaming fail (RECONNECTING→IDLE): counter preserved (ping-pong)   │
 /// └──────────────────────────────────────────────────────────────────────┘
 
+// Use if-chain instead of switch to avoid jump table in RODATA (wastes RAM on ESP8266)
 static const LogString *retry_phase_to_log_string(WiFiRetryPhase phase) {
-  switch (phase) {
-    case WiFiRetryPhase::INITIAL_CONNECT:
-      return LOG_STR("INITIAL_CONNECT");
+  if (phase == WiFiRetryPhase::INITIAL_CONNECT)
+    return LOG_STR("INITIAL_CONNECT");
 #ifdef USE_WIFI_FAST_CONNECT
-    case WiFiRetryPhase::FAST_CONNECT_CYCLING_APS:
-      return LOG_STR("FAST_CONNECT_CYCLING");
+  if (phase == WiFiRetryPhase::FAST_CONNECT_CYCLING_APS)
+    return LOG_STR("FAST_CONNECT_CYCLING");
 #endif
-    case WiFiRetryPhase::EXPLICIT_HIDDEN:
-      return LOG_STR("EXPLICIT_HIDDEN");
-    case WiFiRetryPhase::SCAN_CONNECTING:
-      return LOG_STR("SCAN_CONNECTING");
-    case WiFiRetryPhase::RETRY_HIDDEN:
-      return LOG_STR("RETRY_HIDDEN");
-    case WiFiRetryPhase::RESTARTING_ADAPTER:
-      return LOG_STR("RESTARTING");
-    default:
-      return LOG_STR("UNKNOWN");
-  }
+  if (phase == WiFiRetryPhase::EXPLICIT_HIDDEN)
+    return LOG_STR("EXPLICIT_HIDDEN");
+  if (phase == WiFiRetryPhase::SCAN_CONNECTING)
+    return LOG_STR("SCAN_CONNECTING");
+  if (phase == WiFiRetryPhase::RETRY_HIDDEN)
+    return LOG_STR("RETRY_HIDDEN");
+  if (phase == WiFiRetryPhase::RESTARTING_ADAPTER)
+    return LOG_STR("RESTARTING");
+  return LOG_STR("UNKNOWN");
 }
 
 bool WiFiComponent::went_through_explicit_hidden_phase_() const {
diff --git a/esphome/components/wifi/wifi_component_esp8266.cpp b/esphome/components/wifi/wifi_component_esp8266.cpp
index 6e2adcbf04..6488de8dae 100644
--- a/esphome/components/wifi/wifi_component_esp8266.cpp
+++ b/esphome/components/wifi/wifi_component_esp8266.cpp
@@ -416,75 +416,65 @@ PROGMEM_STRING_TABLE(OpModeStrings, "OFF", "STA", "AP", "AP+STA", "UNKNOWN");
 
 const LogString *get_op_mode_str(uint8_t mode) { return OpModeStrings::get_log_str(mode, OpModeStrings::LAST_INDEX); }
 
+// Use if-chain instead of switch to avoid jump tables in RODATA (wastes RAM on ESP8266).
+// A single switch would generate a sparse lookup table with ~175 default entries, wasting 700 bytes of RAM.
+// Even split switches still generate smaller jump tables in RODATA.
 const LogString *get_disconnect_reason_str(uint8_t reason) {
-  /* If this were one big switch statement, GCC would generate a lookup table for it. However, the values of the
-   * REASON_* constants aren't continuous, and GCC will fill in the gap with the default value -- wasting 4 bytes of RAM
-   * per entry. As there's ~175 default entries, this wastes 700 bytes of RAM.
-   */
-  if (reason <= REASON_CIPHER_SUITE_REJECTED) {  // This must be the last constant with a value <200
-    switch (reason) {
-      case REASON_AUTH_EXPIRE:
-        return LOG_STR("Auth Expired");
-      case REASON_AUTH_LEAVE:
-        return LOG_STR("Auth Leave");
-      case REASON_ASSOC_EXPIRE:
-        return LOG_STR("Association Expired");
-      case REASON_ASSOC_TOOMANY:
-        return LOG_STR("Too Many Associations");
-      case REASON_NOT_AUTHED:
-        return LOG_STR("Not Authenticated");
-      case REASON_NOT_ASSOCED:
-        return LOG_STR("Not Associated");
-      case REASON_ASSOC_LEAVE:
-        return LOG_STR("Association Leave");
-      case REASON_ASSOC_NOT_AUTHED:
-        return LOG_STR("Association not Authenticated");
-      case REASON_DISASSOC_PWRCAP_BAD:
-        return LOG_STR("Disassociate Power Cap Bad");
-      case REASON_DISASSOC_SUPCHAN_BAD:
-        return LOG_STR("Disassociate Supported Channel Bad");
-      case REASON_IE_INVALID:
-        return LOG_STR("IE Invalid");
-      case REASON_MIC_FAILURE:
-        return LOG_STR("Mic Failure");
-      case REASON_4WAY_HANDSHAKE_TIMEOUT:
-        return LOG_STR("4-Way Handshake Timeout");
-      case REASON_GROUP_KEY_UPDATE_TIMEOUT:
-        return LOG_STR("Group Key Update Timeout");
-      case REASON_IE_IN_4WAY_DIFFERS:
-        return LOG_STR("IE In 4-Way Handshake Differs");
-      case REASON_GROUP_CIPHER_INVALID:
-        return LOG_STR("Group Cipher Invalid");
-      case REASON_PAIRWISE_CIPHER_INVALID:
-        return LOG_STR("Pairwise Cipher Invalid");
-      case REASON_AKMP_INVALID:
-        return LOG_STR("AKMP Invalid");
-      case REASON_UNSUPP_RSN_IE_VERSION:
-        return LOG_STR("Unsupported RSN IE version");
-      case REASON_INVALID_RSN_IE_CAP:
-        return LOG_STR("Invalid RSN IE Cap");
-      case REASON_802_1X_AUTH_FAILED:
-        return LOG_STR("802.1x Authentication Failed");
-      case REASON_CIPHER_SUITE_REJECTED:
-        return LOG_STR("Cipher Suite Rejected");
-    }
-  }
-
-  switch (reason) {
-    case REASON_BEACON_TIMEOUT:
-      return LOG_STR("Beacon Timeout");
-    case REASON_NO_AP_FOUND:
-      return LOG_STR("AP Not Found");
-    case REASON_AUTH_FAIL:
-      return LOG_STR("Authentication Failed");
-    case REASON_ASSOC_FAIL:
-      return LOG_STR("Association Failed");
-    case REASON_HANDSHAKE_TIMEOUT:
-      return LOG_STR("Handshake Failed");
-    case REASON_UNSPECIFIED:
-    default:
-      return LOG_STR("Unspecified");
-  }
+  if (reason == REASON_AUTH_EXPIRE)
+    return LOG_STR("Auth Expired");
+  if (reason == REASON_AUTH_LEAVE)
+    return LOG_STR("Auth Leave");
+  if (reason == REASON_ASSOC_EXPIRE)
+    return LOG_STR("Association Expired");
+  if (reason == REASON_ASSOC_TOOMANY)
+    return LOG_STR("Too Many Associations");
+  if (reason == REASON_NOT_AUTHED)
+    return LOG_STR("Not Authenticated");
+  if (reason == REASON_NOT_ASSOCED)
+    return LOG_STR("Not Associated");
+  if (reason == REASON_ASSOC_LEAVE)
+    return LOG_STR("Association Leave");
+  if (reason == REASON_ASSOC_NOT_AUTHED)
+    return LOG_STR("Association not Authenticated");
+  if (reason == REASON_DISASSOC_PWRCAP_BAD)
+    return LOG_STR("Disassociate Power Cap Bad");
+  if (reason == REASON_DISASSOC_SUPCHAN_BAD)
+    return LOG_STR("Disassociate Supported Channel Bad");
+  if (reason == REASON_IE_INVALID)
+    return LOG_STR("IE Invalid");
+  if (reason == REASON_MIC_FAILURE)
+    return LOG_STR("Mic Failure");
+  if (reason == REASON_4WAY_HANDSHAKE_TIMEOUT)
+    return LOG_STR("4-Way Handshake Timeout");
+  if (reason == REASON_GROUP_KEY_UPDATE_TIMEOUT)
+    return LOG_STR("Group Key Update Timeout");
+  if (reason == REASON_IE_IN_4WAY_DIFFERS)
+    return LOG_STR("IE In 4-Way Handshake Differs");
+  if (reason == REASON_GROUP_CIPHER_INVALID)
+    return LOG_STR("Group Cipher Invalid");
+  if (reason == REASON_PAIRWISE_CIPHER_INVALID)
+    return LOG_STR("Pairwise Cipher Invalid");
+  if (reason == REASON_AKMP_INVALID)
+    return LOG_STR("AKMP Invalid");
+  if (reason == REASON_UNSUPP_RSN_IE_VERSION)
+    return LOG_STR("Unsupported RSN IE version");
+  if (reason == REASON_INVALID_RSN_IE_CAP)
+    return LOG_STR("Invalid RSN IE Cap");
+  if (reason == REASON_802_1X_AUTH_FAILED)
+    return LOG_STR("802.1x Authentication Failed");
+  if (reason == REASON_CIPHER_SUITE_REJECTED)
+    return LOG_STR("Cipher Suite Rejected");
+  if (reason == REASON_BEACON_TIMEOUT)
+    return LOG_STR("Beacon Timeout");
+  if (reason == REASON_NO_AP_FOUND)
+    return LOG_STR("AP Not Found");
+  if (reason == REASON_AUTH_FAIL)
+    return LOG_STR("Authentication Failed");
+  if (reason == REASON_ASSOC_FAIL)
+    return LOG_STR("Association Failed");
+  if (reason == REASON_HANDSHAKE_TIMEOUT)
+    return LOG_STR("Handshake Failed");
+  return LOG_STR("Unspecified");
 }
 
 // TODO: This callback runs in ESP8266 system context with limited stack (~2KB).
@@ -645,21 +635,15 @@ void WiFiComponent::wifi_pre_setup_() {
 
 WiFiSTAConnectStatus WiFiComponent::wifi_sta_connect_status_() {
   station_status_t status = wifi_station_get_connect_status();
-  switch (status) {
-    case STATION_GOT_IP:
-      return WiFiSTAConnectStatus::CONNECTED;
-    case STATION_NO_AP_FOUND:
-      return WiFiSTAConnectStatus::ERROR_NETWORK_NOT_FOUND;
-      ;
-    case STATION_CONNECT_FAIL:
-    case STATION_WRONG_PASSWORD:
-      return WiFiSTAConnectStatus::ERROR_CONNECT_FAILED;
-    case STATION_CONNECTING:
-      return WiFiSTAConnectStatus::CONNECTING;
-    case STATION_IDLE:
-    default:
-      return WiFiSTAConnectStatus::IDLE;
-  }
+  if (status == STATION_GOT_IP)
+    return WiFiSTAConnectStatus::CONNECTED;
+  if (status == STATION_NO_AP_FOUND)
+    return WiFiSTAConnectStatus::ERROR_NETWORK_NOT_FOUND;
+  if (status == STATION_CONNECT_FAIL || status == STATION_WRONG_PASSWORD)
+    return WiFiSTAConnectStatus::ERROR_CONNECT_FAILED;
+  if (status == STATION_CONNECTING)
+    return WiFiSTAConnectStatus::CONNECTING;
+  return WiFiSTAConnectStatus::IDLE;
 }
 bool WiFiComponent::wifi_scan_start_(bool passive) {
   static bool first_scan = false;

From 238e40966f8a373ac634987fd30f871d55f0cf59 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Fri, 6 Feb 2026 18:33:26 +0100
Subject: [PATCH 03/10] [light] Move CSWTCH lookup table to PROGMEM in
 get_suitable_color_modes_mask_ (#13801)

---
 esphome/components/light/light_call.cpp | 88 ++++++++++++++-----------
 1 file changed, 48 insertions(+), 40 deletions(-)

diff --git a/esphome/components/light/light_call.cpp b/esphome/components/light/light_call.cpp
index f4bb0c5d11..3b4e136ba5 100644
--- a/esphome/components/light/light_call.cpp
+++ b/esphome/components/light/light_call.cpp
@@ -445,6 +445,52 @@ ColorMode LightCall::compute_color_mode_() {
            LOG_STR_ARG(color_mode_to_human(color_mode)));
   return color_mode;
 }
+// PROGMEM lookup table for get_suitable_color_modes_mask_().
+// Maps 4-bit key (white | ct<<1 | cwww<<2 | rgb<<3) to color mode bitmask.
+// Packed into uint8_t by right-shifting by PACK_SHIFT since the lower bits
+// (UNKNOWN, ON_OFF, BRIGHTNESS) are never present in suitable mode masks.
+static constexpr unsigned PACK_SHIFT = ColorModeBitPolicy::to_bit(ColorMode::WHITE);
+// clang-format off
+static constexpr uint8_t SUITABLE_COLOR_MODES[] PROGMEM = {
+    // [0] none - all modes with brightness
+    static_cast<uint8_t>(ColorModeMask({ColorMode::RGB_WHITE, ColorMode::RGB_COLOR_TEMPERATURE,
+        ColorMode::RGB_COLD_WARM_WHITE, ColorMode::RGB, ColorMode::WHITE, ColorMode::COLOR_TEMPERATURE,
+        ColorMode::COLD_WARM_WHITE}).get_mask() >> PACK_SHIFT),
+    // [1] white only
+    static_cast<uint8_t>(ColorModeMask({ColorMode::WHITE, ColorMode::RGB_WHITE, ColorMode::RGB_COLOR_TEMPERATURE,
+        ColorMode::COLD_WARM_WHITE, ColorMode::RGB_COLD_WARM_WHITE}).get_mask() >> PACK_SHIFT),
+    // [2] ct only
+    static_cast<uint8_t>(ColorModeMask({ColorMode::COLOR_TEMPERATURE, ColorMode::RGB_COLOR_TEMPERATURE,
+        ColorMode::COLD_WARM_WHITE, ColorMode::RGB_COLD_WARM_WHITE}).get_mask() >> PACK_SHIFT),
+    // [3] white + ct
+    static_cast<uint8_t>(ColorModeMask({ColorMode::COLD_WARM_WHITE, ColorMode::RGB_COLOR_TEMPERATURE,
+        ColorMode::RGB_COLD_WARM_WHITE}).get_mask() >> PACK_SHIFT),
+    // [4] cwww only
+    static_cast<uint8_t>(ColorModeMask({ColorMode::COLD_WARM_WHITE,
+        ColorMode::RGB_COLD_WARM_WHITE}).get_mask() >> PACK_SHIFT),
+    0,  // [5] white + cwww (conflicting)
+    0,  // [6] ct + cwww (conflicting)
+    0,  // [7] white + ct + cwww (conflicting)
+    // [8] rgb only
+    static_cast<uint8_t>(ColorModeMask({ColorMode::RGB, ColorMode::RGB_WHITE, ColorMode::RGB_COLOR_TEMPERATURE,
+        ColorMode::RGB_COLD_WARM_WHITE}).get_mask() >> PACK_SHIFT),
+    // [9] rgb + white
+    static_cast<uint8_t>(ColorModeMask({ColorMode::RGB_WHITE, ColorMode::RGB_COLOR_TEMPERATURE,
+        ColorMode::RGB_COLD_WARM_WHITE}).get_mask() >> PACK_SHIFT),
+    // [10] rgb + ct
+    static_cast<uint8_t>(ColorModeMask({ColorMode::RGB_COLOR_TEMPERATURE,
+        ColorMode::RGB_COLD_WARM_WHITE}).get_mask() >> PACK_SHIFT),
+    // [11] rgb + white + ct
+    static_cast<uint8_t>(ColorModeMask({ColorMode::RGB_COLOR_TEMPERATURE,
+        ColorMode::RGB_COLD_WARM_WHITE}).get_mask() >> PACK_SHIFT),
+    // [12] rgb + cwww
+    static_cast<uint8_t>(ColorModeMask({ColorMode::RGB_COLD_WARM_WHITE}).get_mask() >> PACK_SHIFT),
+    0,  // [13] rgb + white + cwww (conflicting)
+    0,  // [14] rgb + ct + cwww (conflicting)
+    0,  // [15] all (conflicting)
+};
+// clang-format on
+
 color_mode_bitmask_t LightCall::get_suitable_color_modes_mask_() {
   bool has_white = this->has_white() && this->white_ > 0.0f;
   bool has_ct = this->has_color_temperature();
@@ -454,46 +500,8 @@ color_mode_bitmask_t LightCall::get_suitable_color_modes_mask_() {
                  (this->has_red() || this->has_green() || this->has_blue());
 
   // Build key from flags: [rgb][cwww][ct][white]
-#define KEY(white, ct, cwww, rgb) ((white) << 0 | (ct) << 1 | (cwww) << 2 | (rgb) << 3)
-
-  uint8_t key = KEY(has_white, has_ct, has_cwww, has_rgb);
-
-  switch (key) {
-    case KEY(true, false, false, false):  // white only
-      return ColorModeMask({ColorMode::WHITE, ColorMode::RGB_WHITE, ColorMode::RGB_COLOR_TEMPERATURE,
-                            ColorMode::COLD_WARM_WHITE, ColorMode::RGB_COLD_WARM_WHITE})
-          .get_mask();
-    case KEY(false, true, false, false):  // ct only
-      return ColorModeMask({ColorMode::COLOR_TEMPERATURE, ColorMode::RGB_COLOR_TEMPERATURE, ColorMode::COLD_WARM_WHITE,
-                            ColorMode::RGB_COLD_WARM_WHITE})
-          .get_mask();
-    case KEY(true, true, false, false):  // white + ct
-      return ColorModeMask(
-                 {ColorMode::COLD_WARM_WHITE, ColorMode::RGB_COLOR_TEMPERATURE, ColorMode::RGB_COLD_WARM_WHITE})
-          .get_mask();
-    case KEY(false, false, true, false):  // cwww only
-      return ColorModeMask({ColorMode::COLD_WARM_WHITE, ColorMode::RGB_COLD_WARM_WHITE}).get_mask();
-    case KEY(false, false, false, false):  // none
-      return ColorModeMask({ColorMode::RGB_WHITE, ColorMode::RGB_COLOR_TEMPERATURE, ColorMode::RGB_COLD_WARM_WHITE,
-                            ColorMode::RGB, ColorMode::WHITE, ColorMode::COLOR_TEMPERATURE, ColorMode::COLD_WARM_WHITE})
-          .get_mask();
-    case KEY(true, false, false, true):  // rgb + white
-      return ColorModeMask({ColorMode::RGB_WHITE, ColorMode::RGB_COLOR_TEMPERATURE, ColorMode::RGB_COLD_WARM_WHITE})
-          .get_mask();
-    case KEY(false, true, false, true):  // rgb + ct
-    case KEY(true, true, false, true):   // rgb + white + ct
-      return ColorModeMask({ColorMode::RGB_COLOR_TEMPERATURE, ColorMode::RGB_COLD_WARM_WHITE}).get_mask();
-    case KEY(false, false, true, true):  // rgb + cwww
-      return ColorModeMask({ColorMode::RGB_COLD_WARM_WHITE}).get_mask();
-    case KEY(false, false, false, true):  // rgb only
-      return ColorModeMask({ColorMode::RGB, ColorMode::RGB_WHITE, ColorMode::RGB_COLOR_TEMPERATURE,
-                            ColorMode::RGB_COLD_WARM_WHITE})
-          .get_mask();
-    default:
-      return 0;  // conflicting flags
-  }
-
-#undef KEY
+  uint8_t key = has_white | (has_ct << 1) | (has_cwww << 2) | (has_rgb << 3);
+  return static_cast<color_mode_bitmask_t>(progmem_read_byte(&SUITABLE_COLOR_MODES[key])) << PACK_SHIFT;
 }
 
 LightCall &LightCall::set_effect(const char *effect, size_t len) {

From 155447f541b18524ce8a9509e3614c1411c91e6e Mon Sep 17 00:00:00 2001
From: PolarGoose <35307286+PolarGoose@users.noreply.github.com>
Date: Fri, 6 Feb 2026 18:53:59 +0100
Subject: [PATCH 04/10] [dsmr] Fix issue with parsing lines like
 `1-0:0.2.0((ER11))` (#13780)

---
 .clang-tidy.hash                       | 2 +-
 esphome/components/dsmr/__init__.py    | 2 +-
 esphome/components/dsmr/sensor.py      | 8 --------
 esphome/components/dsmr/text_sensor.py | 2 ++
 platformio.ini                         | 2 +-
 5 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/.clang-tidy.hash b/.clang-tidy.hash
index ab354259e3..63ddbbac05 100644
--- a/.clang-tidy.hash
+++ b/.clang-tidy.hash
@@ -1 +1 @@
-069fa9526c52f7c580a9ec17c7678d12f142221387e9b561c18f95394d4629a3
+37ec8d5a343c8d0a485fd2118cbdabcbccd7b9bca197e4a392be75087974dced
diff --git a/esphome/components/dsmr/__init__.py b/esphome/components/dsmr/__init__.py
index 386da3ce21..7d76856f28 100644
--- a/esphome/components/dsmr/__init__.py
+++ b/esphome/components/dsmr/__init__.py
@@ -66,7 +66,7 @@ async def to_code(config):
     cg.add_build_flag("-DDSMR_WATER_MBUS_ID=" + str(config[CONF_WATER_MBUS_ID]))
 
     # DSMR Parser
-    cg.add_library("esphome/dsmr_parser", "1.0.0")
+    cg.add_library("esphome/dsmr_parser", "1.1.0")
 
     # Crypto
     cg.add_library("polargoose/Crypto-no-arduino", "0.4.0")
diff --git a/esphome/components/dsmr/sensor.py b/esphome/components/dsmr/sensor.py
index 7d69f79530..863af42d1b 100644
--- a/esphome/components/dsmr/sensor.py
+++ b/esphome/components/dsmr/sensor.py
@@ -718,14 +718,6 @@ CONFIG_SCHEMA = cv.Schema(
             device_class=DEVICE_CLASS_POWER,
             state_class=STATE_CLASS_MEASUREMENT,
         ),
-        cv.Optional("fw_core_version"): sensor.sensor_schema(
-            accuracy_decimals=3,
-            state_class=STATE_CLASS_MEASUREMENT,
-        ),
-        cv.Optional("fw_module_version"): sensor.sensor_schema(
-            accuracy_decimals=3,
-            state_class=STATE_CLASS_MEASUREMENT,
-        ),
     }
 ).extend(cv.COMPONENT_SCHEMA)
 
diff --git a/esphome/components/dsmr/text_sensor.py b/esphome/components/dsmr/text_sensor.py
index 4c7455a38f..203c9c997e 100644
--- a/esphome/components/dsmr/text_sensor.py
+++ b/esphome/components/dsmr/text_sensor.py
@@ -26,7 +26,9 @@ CONFIG_SCHEMA = cv.Schema(
         cv.Optional("sub_equipment_id"): text_sensor.text_sensor_schema(),
         cv.Optional("gas_delivered_text"): text_sensor.text_sensor_schema(),
         cv.Optional("fw_core_checksum"): text_sensor.text_sensor_schema(),
+        cv.Optional("fw_core_version"): text_sensor.text_sensor_schema(),
         cv.Optional("fw_module_checksum"): text_sensor.text_sensor_schema(),
+        cv.Optional("fw_module_version"): text_sensor.text_sensor_schema(),
         cv.Optional("telegram"): text_sensor.text_sensor_schema().extend(
             {cv.Optional(CONF_INTERNAL, default=True): cv.boolean}
         ),
diff --git a/platformio.ini b/platformio.ini
index bb0de3c2b1..d198862a25 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -37,7 +37,7 @@ lib_deps_base =
     wjtje/qr-code-generator-library@1.7.0  ; qr_code
     functionpointer/arduino-MLX90393@1.0.2 ; mlx90393
     pavlodn/HaierProtocol@0.9.31           ; haier
-    esphome/dsmr_parser@1.0.0              ; dsmr
+    esphome/dsmr_parser@1.1.0              ; dsmr
     polargoose/Crypto-no-arduino@0.4.0     ; dsmr
     https://github.com/esphome/TinyGPSPlus.git#v1.1.0     ; gps
 ; This is using the repository until a new release is published to PlatformIO

From 9315da79bc016c5b45ba93ca85a2c257b89d559c Mon Sep 17 00:00:00 2001
From: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
Date: Fri, 6 Feb 2026 13:03:16 -0500
Subject: [PATCH 05/10] [core] Add missing requests dependency to
 requirements.txt (#13803)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
---
 requirements.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/requirements.txt b/requirements.txt
index bb118c5f9a..1771867535 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,6 +23,7 @@ resvg-py==0.2.6
 freetype-py==2.5.1
 jinja2==3.1.6
 bleak==2.1.1
+requests==2.32.5
 
 # esp-idf >= 5.0 requires this
 pyparsing >= 3.0

From 41cecbfb0f62db7e6dffff709e34141a06e59f7f Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Fri, 6 Feb 2026 19:22:26 +0100
Subject: [PATCH 06/10] [template] Convert alarm sensor type to
 PROGMEM_STRING_TABLE and narrow enum to uint8_t (#13804)

---
 .../template_alarm_control_panel.cpp             | 16 +++++-----------
 .../template_alarm_control_panel.h               |  2 +-
 2 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/esphome/components/template/alarm_control_panel/template_alarm_control_panel.cpp b/esphome/components/template/alarm_control_panel/template_alarm_control_panel.cpp
index 1a5aef6b8d..09efe678ce 100644
--- a/esphome/components/template/alarm_control_panel/template_alarm_control_panel.cpp
+++ b/esphome/components/template/alarm_control_panel/template_alarm_control_panel.cpp
@@ -5,6 +5,7 @@
 #include "esphome/core/application.h"
 #include "esphome/core/helpers.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 
 namespace esphome::template_ {
 
@@ -28,18 +29,11 @@ void TemplateAlarmControlPanel::add_sensor(binary_sensor::BinarySensor *sensor,
   this->sensor_data_.push_back(sd);
 };
 
+// Alarm sensor type strings indexed by AlarmSensorType enum (0-3): DELAYED, INSTANT, DELAYED_FOLLOWER, INSTANT_ALWAYS
+PROGMEM_STRING_TABLE(AlarmSensorTypeStrings, "delayed", "instant", "delayed_follower", "instant_always");
+
 static const LogString *sensor_type_to_string(AlarmSensorType type) {
-  switch (type) {
-    case ALARM_SENSOR_TYPE_INSTANT:
-      return LOG_STR("instant");
-    case ALARM_SENSOR_TYPE_DELAYED_FOLLOWER:
-      return LOG_STR("delayed_follower");
-    case ALARM_SENSOR_TYPE_INSTANT_ALWAYS:
-      return LOG_STR("instant_always");
-    case ALARM_SENSOR_TYPE_DELAYED:
-    default:
-      return LOG_STR("delayed");
-  }
+  return AlarmSensorTypeStrings::get_log_str(static_cast<uint8_t>(type), 0);
 }
 #endif
 
diff --git a/esphome/components/template/alarm_control_panel/template_alarm_control_panel.h b/esphome/components/template/alarm_control_panel/template_alarm_control_panel.h
index df3b64fb6e..4f32e99fd7 100644
--- a/esphome/components/template/alarm_control_panel/template_alarm_control_panel.h
+++ b/esphome/components/template/alarm_control_panel/template_alarm_control_panel.h
@@ -26,7 +26,7 @@ enum BinarySensorFlags : uint16_t {
   BINARY_SENSOR_MODE_BYPASS_AUTO = 1 << 4,
 };
 
-enum AlarmSensorType : uint16_t {
+enum AlarmSensorType : uint8_t {
   ALARM_SENSOR_TYPE_DELAYED = 0,
   ALARM_SENSOR_TYPE_INSTANT,
   ALARM_SENSOR_TYPE_DELAYED_FOLLOWER,

From 86f91eed2f69a7cdb7789fb4927d560a7133e890 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Fri, 6 Feb 2026 19:30:05 +0100
Subject: [PATCH 07/10] [mqtt] Move switch string tables to
 PROGMEM_STRING_TABLE (#13802)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
---
 .../mqtt/mqtt_alarm_control_panel.cpp         |  29 +----
 esphome/components/mqtt/mqtt_client.cpp       |  38 ++----
 esphome/components/mqtt/mqtt_climate.cpp      | 115 ++++--------------
 esphome/components/mqtt/mqtt_component.cpp    |  13 +-
 esphome/components/mqtt/mqtt_number.cpp       |  17 ++-
 esphome/components/mqtt/mqtt_text.cpp         |  14 +--
 6 files changed, 58 insertions(+), 168 deletions(-)

diff --git a/esphome/components/mqtt/mqtt_alarm_control_panel.cpp b/esphome/components/mqtt/mqtt_alarm_control_panel.cpp
index dc8f75d8f5..a461a140ae 100644
--- a/esphome/components/mqtt/mqtt_alarm_control_panel.cpp
+++ b/esphome/components/mqtt/mqtt_alarm_control_panel.cpp
@@ -13,31 +13,12 @@ static const char *const TAG = "mqtt.alarm_control_panel";
 
 using namespace esphome::alarm_control_panel;
 
+// Alarm state MQTT strings indexed by AlarmControlPanelState enum (0-9)
+PROGMEM_STRING_TABLE(AlarmMqttStateStrings, "disarmed", "armed_home", "armed_away", "armed_night", "armed_vacation",
+                     "armed_custom_bypass", "pending", "arming", "disarming", "triggered", "unknown");
+
 static ProgmemStr alarm_state_to_mqtt_str(AlarmControlPanelState state) {
-  switch (state) {
-    case ACP_STATE_DISARMED:
-      return ESPHOME_F("disarmed");
-    case ACP_STATE_ARMED_HOME:
-      return ESPHOME_F("armed_home");
-    case ACP_STATE_ARMED_AWAY:
-      return ESPHOME_F("armed_away");
-    case ACP_STATE_ARMED_NIGHT:
-      return ESPHOME_F("armed_night");
-    case ACP_STATE_ARMED_VACATION:
-      return ESPHOME_F("armed_vacation");
-    case ACP_STATE_ARMED_CUSTOM_BYPASS:
-      return ESPHOME_F("armed_custom_bypass");
-    case ACP_STATE_PENDING:
-      return ESPHOME_F("pending");
-    case ACP_STATE_ARMING:
-      return ESPHOME_F("arming");
-    case ACP_STATE_DISARMING:
-      return ESPHOME_F("disarming");
-    case ACP_STATE_TRIGGERED:
-      return ESPHOME_F("triggered");
-    default:
-      return ESPHOME_F("unknown");
-  }
+  return AlarmMqttStateStrings::get_progmem_str(static_cast<uint8_t>(state), AlarmMqttStateStrings::LAST_INDEX);
 }
 
 MQTTAlarmControlPanelComponent::MQTTAlarmControlPanelComponent(AlarmControlPanel *alarm_control_panel)
diff --git a/esphome/components/mqtt/mqtt_client.cpp b/esphome/components/mqtt/mqtt_client.cpp
index a284b162dd..d503461257 100644
--- a/esphome/components/mqtt/mqtt_client.cpp
+++ b/esphome/components/mqtt/mqtt_client.cpp
@@ -8,6 +8,7 @@
 #include "esphome/core/entity_base.h"
 #include "esphome/core/helpers.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 #include "esphome/core/version.h"
 #ifdef USE_LOGGER
 #include "esphome/components/logger/logger.h"
@@ -27,6 +28,11 @@ namespace esphome::mqtt {
 
 static const char *const TAG = "mqtt";
 
+// Disconnect reason strings indexed by MQTTClientDisconnectReason enum (0-8)
+PROGMEM_STRING_TABLE(MQTTDisconnectReasonStrings, "TCP disconnected", "Unacceptable Protocol Version",
+                     "Identifier Rejected", "Server Unavailable", "Malformed Credentials", "Not Authorized",
+                     "Not Enough Space", "TLS Bad Fingerprint", "DNS Resolve Error", "Unknown");
+
 MQTTClientComponent::MQTTClientComponent() {
   global_mqtt_client = this;
   char mac_addr[MAC_ADDRESS_BUFFER_SIZE];
@@ -348,36 +354,8 @@ void MQTTClientComponent::loop() {
   mqtt_backend_.loop();
 
   if (this->disconnect_reason_.has_value()) {
-    const LogString *reason_s;
-    switch (*this->disconnect_reason_) {
-      case MQTTClientDisconnectReason::TCP_DISCONNECTED:
-        reason_s = LOG_STR("TCP disconnected");
-        break;
-      case MQTTClientDisconnectReason::MQTT_UNACCEPTABLE_PROTOCOL_VERSION:
-        reason_s = LOG_STR("Unacceptable Protocol Version");
-        break;
-      case MQTTClientDisconnectReason::MQTT_IDENTIFIER_REJECTED:
-        reason_s = LOG_STR("Identifier Rejected");
-        break;
-      case MQTTClientDisconnectReason::MQTT_SERVER_UNAVAILABLE:
-        reason_s = LOG_STR("Server Unavailable");
-        break;
-      case MQTTClientDisconnectReason::MQTT_MALFORMED_CREDENTIALS:
-        reason_s = LOG_STR("Malformed Credentials");
-        break;
-      case MQTTClientDisconnectReason::MQTT_NOT_AUTHORIZED:
-        reason_s = LOG_STR("Not Authorized");
-        break;
-      case MQTTClientDisconnectReason::ESP8266_NOT_ENOUGH_SPACE:
-        reason_s = LOG_STR("Not Enough Space");
-        break;
-      case MQTTClientDisconnectReason::TLS_BAD_FINGERPRINT:
-        reason_s = LOG_STR("TLS Bad Fingerprint");
-        break;
-      default:
-        reason_s = LOG_STR("Unknown");
-        break;
-    }
+    const LogString *reason_s = MQTTDisconnectReasonStrings::get_log_str(
+        static_cast<uint8_t>(*this->disconnect_reason_), MQTTDisconnectReasonStrings::LAST_INDEX);
     if (!network::is_connected()) {
       reason_s = LOG_STR("WiFi disconnected");
     }
diff --git a/esphome/components/mqtt/mqtt_climate.cpp b/esphome/components/mqtt/mqtt_climate.cpp
index 673593ef84..158cfb5552 100644
--- a/esphome/components/mqtt/mqtt_climate.cpp
+++ b/esphome/components/mqtt/mqtt_climate.cpp
@@ -13,109 +13,44 @@ static const char *const TAG = "mqtt.climate";
 
 using namespace esphome::climate;
 
+// Climate mode MQTT strings indexed by ClimateMode enum (0-6): OFF, HEAT_COOL, COOL, HEAT, FAN_ONLY, DRY, AUTO
+PROGMEM_STRING_TABLE(ClimateMqttModeStrings, "off", "heat_cool", "cool", "heat", "fan_only", "dry", "auto", "unknown");
+
 static ProgmemStr climate_mode_to_mqtt_str(ClimateMode mode) {
-  switch (mode) {
-    case CLIMATE_MODE_OFF:
-      return ESPHOME_F("off");
-    case CLIMATE_MODE_HEAT_COOL:
-      return ESPHOME_F("heat_cool");
-    case CLIMATE_MODE_AUTO:
-      return ESPHOME_F("auto");
-    case CLIMATE_MODE_COOL:
-      return ESPHOME_F("cool");
-    case CLIMATE_MODE_HEAT:
-      return ESPHOME_F("heat");
-    case CLIMATE_MODE_FAN_ONLY:
-      return ESPHOME_F("fan_only");
-    case CLIMATE_MODE_DRY:
-      return ESPHOME_F("dry");
-    default:
-      return ESPHOME_F("unknown");
-  }
+  return ClimateMqttModeStrings::get_progmem_str(static_cast<uint8_t>(mode), ClimateMqttModeStrings::LAST_INDEX);
 }
 
+// Climate action MQTT strings indexed by ClimateAction enum (0,2-6): OFF, (gap), COOLING, HEATING, IDLE, DRYING, FAN
+PROGMEM_STRING_TABLE(ClimateMqttActionStrings, "off", "unknown", "cooling", "heating", "idle", "drying", "fan",
+                     "unknown");
+
 static ProgmemStr climate_action_to_mqtt_str(ClimateAction action) {
-  switch (action) {
-    case CLIMATE_ACTION_OFF:
-      return ESPHOME_F("off");
-    case CLIMATE_ACTION_COOLING:
-      return ESPHOME_F("cooling");
-    case CLIMATE_ACTION_HEATING:
-      return ESPHOME_F("heating");
-    case CLIMATE_ACTION_IDLE:
-      return ESPHOME_F("idle");
-    case CLIMATE_ACTION_DRYING:
-      return ESPHOME_F("drying");
-    case CLIMATE_ACTION_FAN:
-      return ESPHOME_F("fan");
-    default:
-      return ESPHOME_F("unknown");
-  }
+  return ClimateMqttActionStrings::get_progmem_str(static_cast<uint8_t>(action), ClimateMqttActionStrings::LAST_INDEX);
 }
 
+// Climate fan mode MQTT strings indexed by ClimateFanMode enum (0-9)
+PROGMEM_STRING_TABLE(ClimateMqttFanModeStrings, "on", "off", "auto", "low", "medium", "high", "middle", "focus",
+                     "diffuse", "quiet", "unknown");
+
 static ProgmemStr climate_fan_mode_to_mqtt_str(ClimateFanMode fan_mode) {
-  switch (fan_mode) {
-    case CLIMATE_FAN_ON:
-      return ESPHOME_F("on");
-    case CLIMATE_FAN_OFF:
-      return ESPHOME_F("off");
-    case CLIMATE_FAN_AUTO:
-      return ESPHOME_F("auto");
-    case CLIMATE_FAN_LOW:
-      return ESPHOME_F("low");
-    case CLIMATE_FAN_MEDIUM:
-      return ESPHOME_F("medium");
-    case CLIMATE_FAN_HIGH:
-      return ESPHOME_F("high");
-    case CLIMATE_FAN_MIDDLE:
-      return ESPHOME_F("middle");
-    case CLIMATE_FAN_FOCUS:
-      return ESPHOME_F("focus");
-    case CLIMATE_FAN_DIFFUSE:
-      return ESPHOME_F("diffuse");
-    case CLIMATE_FAN_QUIET:
-      return ESPHOME_F("quiet");
-    default:
-      return ESPHOME_F("unknown");
-  }
+  return ClimateMqttFanModeStrings::get_progmem_str(static_cast<uint8_t>(fan_mode),
+                                                    ClimateMqttFanModeStrings::LAST_INDEX);
 }
 
+// Climate swing mode MQTT strings indexed by ClimateSwingMode enum (0-3): OFF, BOTH, VERTICAL, HORIZONTAL
+PROGMEM_STRING_TABLE(ClimateMqttSwingModeStrings, "off", "both", "vertical", "horizontal", "unknown");
+
 static ProgmemStr climate_swing_mode_to_mqtt_str(ClimateSwingMode swing_mode) {
-  switch (swing_mode) {
-    case CLIMATE_SWING_OFF:
-      return ESPHOME_F("off");
-    case CLIMATE_SWING_BOTH:
-      return ESPHOME_F("both");
-    case CLIMATE_SWING_VERTICAL:
-      return ESPHOME_F("vertical");
-    case CLIMATE_SWING_HORIZONTAL:
-      return ESPHOME_F("horizontal");
-    default:
-      return ESPHOME_F("unknown");
-  }
+  return ClimateMqttSwingModeStrings::get_progmem_str(static_cast<uint8_t>(swing_mode),
+                                                      ClimateMqttSwingModeStrings::LAST_INDEX);
 }
 
+// Climate preset MQTT strings indexed by ClimatePreset enum (0-7)
+PROGMEM_STRING_TABLE(ClimateMqttPresetStrings, "none", "home", "away", "boost", "comfort", "eco", "sleep", "activity",
+                     "unknown");
+
 static ProgmemStr climate_preset_to_mqtt_str(ClimatePreset preset) {
-  switch (preset) {
-    case CLIMATE_PRESET_NONE:
-      return ESPHOME_F("none");
-    case CLIMATE_PRESET_HOME:
-      return ESPHOME_F("home");
-    case CLIMATE_PRESET_ECO:
-      return ESPHOME_F("eco");
-    case CLIMATE_PRESET_AWAY:
-      return ESPHOME_F("away");
-    case CLIMATE_PRESET_BOOST:
-      return ESPHOME_F("boost");
-    case CLIMATE_PRESET_COMFORT:
-      return ESPHOME_F("comfort");
-    case CLIMATE_PRESET_SLEEP:
-      return ESPHOME_F("sleep");
-    case CLIMATE_PRESET_ACTIVITY:
-      return ESPHOME_F("activity");
-    default:
-      return ESPHOME_F("unknown");
-  }
+  return ClimateMqttPresetStrings::get_progmem_str(static_cast<uint8_t>(preset), ClimateMqttPresetStrings::LAST_INDEX);
 }
 
 void MQTTClimateComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryConfig &config) {
diff --git a/esphome/components/mqtt/mqtt_component.cpp b/esphome/components/mqtt/mqtt_component.cpp
index a77afd3f4e..e4b80de50a 100644
--- a/esphome/components/mqtt/mqtt_component.cpp
+++ b/esphome/components/mqtt/mqtt_component.cpp
@@ -14,6 +14,9 @@ namespace esphome::mqtt {
 
 static const char *const TAG = "mqtt.component";
 
+// Entity category MQTT strings indexed by EntityCategory enum: NONE(0) is skipped, CONFIG(1), DIAGNOSTIC(2)
+PROGMEM_STRING_TABLE(EntityCategoryMqttStrings, "", "config", "diagnostic");
+
 // Helper functions for building topic strings on stack
 inline char *append_str(char *p, const char *s, size_t len) {
   memcpy(p, s, len);
@@ -213,13 +216,9 @@ bool MQTTComponent::send_discovery_() {
         // NOLINTEND(clang-analyzer-cplusplus.NewDeleteLeaks)
 
         const auto entity_category = this->get_entity()->get_entity_category();
-        switch (entity_category) {
-          case ENTITY_CATEGORY_NONE:
-            break;
-          case ENTITY_CATEGORY_CONFIG:
-          case ENTITY_CATEGORY_DIAGNOSTIC:
-            root[MQTT_ENTITY_CATEGORY] = entity_category == ENTITY_CATEGORY_CONFIG ? "config" : "diagnostic";
-            break;
+        if (entity_category != ENTITY_CATEGORY_NONE) {
+          root[MQTT_ENTITY_CATEGORY] = EntityCategoryMqttStrings::get_progmem_str(
+              static_cast<uint8_t>(entity_category), static_cast<uint8_t>(ENTITY_CATEGORY_CONFIG));
         }
 
         if (config.state_topic) {
diff --git a/esphome/components/mqtt/mqtt_number.cpp b/esphome/components/mqtt/mqtt_number.cpp
index 7dc93eee0c..fdc909fcc9 100644
--- a/esphome/components/mqtt/mqtt_number.cpp
+++ b/esphome/components/mqtt/mqtt_number.cpp
@@ -1,5 +1,6 @@
 #include "mqtt_number.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 
 #include "mqtt_const.h"
 
@@ -12,6 +13,9 @@ static const char *const TAG = "mqtt.number";
 
 using namespace esphome::number;
 
+// Number mode MQTT strings indexed by NumberMode enum: AUTO(0) is skipped, BOX(1), SLIDER(2)
+PROGMEM_STRING_TABLE(NumberMqttModeStrings, "", "box", "slider");
+
 MQTTNumberComponent::MQTTNumberComponent(Number *number) : number_(number) {}
 
 void MQTTNumberComponent::setup() {
@@ -48,15 +52,10 @@ void MQTTNumberComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryCon
   if (!unit_of_measurement.empty()) {
     root[MQTT_UNIT_OF_MEASUREMENT] = unit_of_measurement;
   }
-  switch (this->number_->traits.get_mode()) {
-    case NUMBER_MODE_AUTO:
-      break;
-    case NUMBER_MODE_BOX:
-      root[MQTT_MODE] = "box";
-      break;
-    case NUMBER_MODE_SLIDER:
-      root[MQTT_MODE] = "slider";
-      break;
+  const auto mode = this->number_->traits.get_mode();
+  if (mode != NUMBER_MODE_AUTO) {
+    root[MQTT_MODE] =
+        NumberMqttModeStrings::get_progmem_str(static_cast<uint8_t>(mode), static_cast<uint8_t>(NUMBER_MODE_BOX));
   }
   const auto device_class = this->number_->traits.get_device_class_ref();
   if (!device_class.empty()) {
diff --git a/esphome/components/mqtt/mqtt_text.cpp b/esphome/components/mqtt/mqtt_text.cpp
index 16293c0603..200e420c9c 100644
--- a/esphome/components/mqtt/mqtt_text.cpp
+++ b/esphome/components/mqtt/mqtt_text.cpp
@@ -1,5 +1,6 @@
 #include "mqtt_text.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 
 #include "mqtt_const.h"
 
@@ -12,6 +13,9 @@ static const char *const TAG = "mqtt.text";
 
 using namespace esphome::text;
 
+// Text mode MQTT strings indexed by TextMode enum (0-1): TEXT, PASSWORD
+PROGMEM_STRING_TABLE(TextMqttModeStrings, "text", "password");
+
 MQTTTextComponent::MQTTTextComponent(Text *text) : text_(text) {}
 
 void MQTTTextComponent::setup() {
@@ -34,14 +38,8 @@ const EntityBase *MQTTTextComponent::get_entity() const { return this->text_; }
 
 void MQTTTextComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryConfig &config) {
   // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
-  switch (this->text_->traits.get_mode()) {
-    case TEXT_MODE_TEXT:
-      root[MQTT_MODE] = "text";
-      break;
-    case TEXT_MODE_PASSWORD:
-      root[MQTT_MODE] = "password";
-      break;
-  }
+  root[MQTT_MODE] = TextMqttModeStrings::get_progmem_str(static_cast<uint8_t>(this->text_->traits.get_mode()),
+                                                         static_cast<uint8_t>(TEXT_MODE_TEXT));
 
   config.command_topic = true;
 }

From eb7aa3420fcf0d649953a0ce6c8643c0a2357e31 Mon Sep 17 00:00:00 2001
From: tronikos <tronikos@users.noreply.github.com>
Date: Fri, 6 Feb 2026 12:23:42 -0800
Subject: [PATCH 08/10] Add target_temperature to the template water heater
 (#13661)

Co-authored-by: J. Nick Koston <nick@koston.org>
---
 .../components/template/water_heater/__init__.py   |  9 +++++++++
 .../water_heater/template_water_heater.cpp         | 14 +++++++++++++-
 .../template/water_heater/template_water_heater.h  |  4 ++++
 tests/components/template/common-base.yaml         |  1 +
 .../fixtures/water_heater_template.yaml            |  1 +
 tests/integration/test_water_heater_template.py    |  3 +++
 6 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/esphome/components/template/water_heater/__init__.py b/esphome/components/template/water_heater/__init__.py
index bddd378b23..5f96155fbf 100644
--- a/esphome/components/template/water_heater/__init__.py
+++ b/esphome/components/template/water_heater/__init__.py
@@ -46,6 +46,7 @@ CONFIG_SCHEMA = (
                 RESTORE_MODES, upper=True
             ),
             cv.Optional(CONF_CURRENT_TEMPERATURE): cv.returning_lambda,
+            cv.Optional(CONF_TARGET_TEMPERATURE): cv.returning_lambda,
             cv.Optional(CONF_MODE): cv.returning_lambda,
             cv.Optional(CONF_SUPPORTED_MODES): cv.ensure_list(
                 water_heater.validate_water_heater_mode
@@ -78,6 +79,14 @@ async def to_code(config: ConfigType) -> None:
         )
         cg.add(var.set_current_temperature_lambda(template_))
 
+    if CONF_TARGET_TEMPERATURE in config:
+        template_ = await cg.process_lambda(
+            config[CONF_TARGET_TEMPERATURE],
+            [],
+            return_type=cg.optional.template(cg.float_),
+        )
+        cg.add(var.set_target_temperature_lambda(template_))
+
     if CONF_MODE in config:
         template_ = await cg.process_lambda(
             config[CONF_MODE],
diff --git a/esphome/components/template/water_heater/template_water_heater.cpp b/esphome/components/template/water_heater/template_water_heater.cpp
index f888edb1df..c354deee0e 100644
--- a/esphome/components/template/water_heater/template_water_heater.cpp
+++ b/esphome/components/template/water_heater/template_water_heater.cpp
@@ -16,7 +16,8 @@ void TemplateWaterHeater::setup() {
       restore->perform();
     }
   }
-  if (!this->current_temperature_f_.has_value() && !this->mode_f_.has_value())
+  if (!this->current_temperature_f_.has_value() && !this->target_temperature_f_.has_value() &&
+      !this->mode_f_.has_value())
     this->disable_loop();
 }
 
@@ -28,6 +29,9 @@ water_heater::WaterHeaterTraits TemplateWaterHeater::traits() {
   }
 
   traits.set_supports_current_temperature(true);
+  if (this->target_temperature_f_.has_value()) {
+    traits.add_feature_flags(water_heater::WATER_HEATER_SUPPORTS_TARGET_TEMPERATURE);
+  }
   return traits;
 }
 
@@ -42,6 +46,14 @@ void TemplateWaterHeater::loop() {
     }
   }
 
+  auto target_temp = this->target_temperature_f_.call();
+  if (target_temp.has_value()) {
+    if (*target_temp != this->target_temperature_) {
+      this->target_temperature_ = *target_temp;
+      changed = true;
+    }
+  }
+
   auto new_mode = this->mode_f_.call();
   if (new_mode.has_value()) {
     if (*new_mode != this->mode_) {
diff --git a/esphome/components/template/water_heater/template_water_heater.h b/esphome/components/template/water_heater/template_water_heater.h
index f1cf00a115..22173209aa 100644
--- a/esphome/components/template/water_heater/template_water_heater.h
+++ b/esphome/components/template/water_heater/template_water_heater.h
@@ -20,6 +20,9 @@ class TemplateWaterHeater : public Component, public water_heater::WaterHeater {
   template<typename F> void set_current_temperature_lambda(F &&f) {
     this->current_temperature_f_.set(std::forward<F>(f));
   }
+  template<typename F> void set_target_temperature_lambda(F &&f) {
+    this->target_temperature_f_.set(std::forward<F>(f));
+  }
   template<typename F> void set_mode_lambda(F &&f) { this->mode_f_.set(std::forward<F>(f)); }
 
   void set_optimistic(bool optimistic) { this->optimistic_ = optimistic; }
@@ -44,6 +47,7 @@ class TemplateWaterHeater : public Component, public water_heater::WaterHeater {
   // Ordered to minimize padding on 32-bit: 4-byte members first, then smaller
   Trigger<> set_trigger_;
   TemplateLambda<float> current_temperature_f_;
+  TemplateLambda<float> target_temperature_f_;
   TemplateLambda<water_heater::WaterHeaterMode> mode_f_;
   TemplateWaterHeaterRestoreMode restore_mode_{WATER_HEATER_NO_RESTORE};
   water_heater::WaterHeaterModeMask supported_modes_;
diff --git a/tests/components/template/common-base.yaml b/tests/components/template/common-base.yaml
index d1849efaf7..b8742f8c7b 100644
--- a/tests/components/template/common-base.yaml
+++ b/tests/components/template/common-base.yaml
@@ -412,6 +412,7 @@ water_heater:
     name: "Template Water Heater"
     optimistic: true
     current_temperature: !lambda "return 42.0f;"
+    target_temperature: !lambda "return 60.0f;"
     mode: !lambda "return water_heater::WATER_HEATER_MODE_ECO;"
     supported_modes:
       - "OFF"
diff --git a/tests/integration/fixtures/water_heater_template.yaml b/tests/integration/fixtures/water_heater_template.yaml
index b54ebed789..1aaded1991 100644
--- a/tests/integration/fixtures/water_heater_template.yaml
+++ b/tests/integration/fixtures/water_heater_template.yaml
@@ -10,6 +10,7 @@ water_heater:
     name: Test Boiler
     optimistic: true
     current_temperature: !lambda "return 45.0f;"
+    target_temperature: !lambda "return 60.0f;"
     # Note: No mode lambda - we want optimistic mode changes to stick
     # A mode lambda would override mode changes in loop()
     supported_modes:
diff --git a/tests/integration/test_water_heater_template.py b/tests/integration/test_water_heater_template.py
index b5f1fb64c0..6b4a685d0d 100644
--- a/tests/integration/test_water_heater_template.py
+++ b/tests/integration/test_water_heater_template.py
@@ -85,6 +85,9 @@ async def test_water_heater_template(
         assert initial_state.current_temperature == 45.0, (
             f"Expected current temp 45.0, got {initial_state.current_temperature}"
         )
+        assert initial_state.target_temperature == 60.0, (
+            f"Expected target temp 60.0, got {initial_state.target_temperature}"
+        )
 
         # Test changing to GAS mode
         client.water_heater_command(test_water_heater.key, mode=WaterHeaterMode.GAS)

From 9de91539e6d1990593400db003ad05a7c55795d3 Mon Sep 17 00:00:00 2001
From: schrob <83939986+schdro@users.noreply.github.com>
Date: Sat, 7 Feb 2026 20:24:57 +0100
Subject: [PATCH 09/10] [epaper_spi] Add Waveshare 1.54-G (#13758)

---
 esphome/components/epaper_spi/colorconv.h     |  67 ++++++
 .../epaper_spi/epaper_spi_jd79660.cpp         | 227 ++++++++++++++++++
 .../epaper_spi/epaper_spi_jd79660.h           | 145 +++++++++++
 .../components/epaper_spi/models/jd79660.py   |  86 +++++++
 .../epaper_spi/test.esp32-s3-idf.yaml         |  16 ++
 5 files changed, 541 insertions(+)
 create mode 100644 esphome/components/epaper_spi/colorconv.h
 create mode 100644 esphome/components/epaper_spi/epaper_spi_jd79660.cpp
 create mode 100644 esphome/components/epaper_spi/epaper_spi_jd79660.h
 create mode 100644 esphome/components/epaper_spi/models/jd79660.py

diff --git a/esphome/components/epaper_spi/colorconv.h b/esphome/components/epaper_spi/colorconv.h
new file mode 100644
index 0000000000..a2ea28f4b6
--- /dev/null
+++ b/esphome/components/epaper_spi/colorconv.h
@@ -0,0 +1,67 @@
+#pragma once
+
+#include <cstdint>
+#include <algorithm>
+#include "esphome/core/color.h"
+
+/* Utility for converting internal \a Color RGB representation to supported IC hardware color keys
+ *
+ * Focus in driver layer is on efficiency.
+ * For optimum output quality on RGB inputs consider offline color keying/dithering.
+ * Also see e.g. Image component.
+ */
+
+namespace esphome::epaper_spi {
+
+/** Delta for when to regard as gray */
+static constexpr uint8_t COLORCONV_GRAY_THRESHOLD = 50;
+
+/** Map RGB color to discrete BWYR hex 4 color key
+ *
+ * @tparam NATIVE_COLOR  Type of native hardware color values
+ * @param color     RGB color to convert from
+ * @param hw_black  Native value for black
+ * @param hw_white  Native value for white
+ * @param hw_yellow Native value for yellow
+ * @param hw_red    Native value for red
+ * @return          Converted native hardware color value
+ * @internal Constexpr. Does not depend on side effects ("pure").
+ */
+template<typename NATIVE_COLOR>
+constexpr NATIVE_COLOR color_to_bwyr(Color color, NATIVE_COLOR hw_black, NATIVE_COLOR hw_white, NATIVE_COLOR hw_yellow,
+                                     NATIVE_COLOR hw_red) {
+  // --- Step 1: Check for Grayscale (Black or White) ---
+  // We define "grayscale" as a color where the min and max components
+  // are close to each other.
+
+  const auto [min_rgb, max_rgb] = std::minmax({color.r, color.g, color.b});
+
+  if ((max_rgb - min_rgb) < COLORCONV_GRAY_THRESHOLD) {
+    // It's a shade of gray. Map to BLACK or WHITE.
+    // We split the luminance at the halfway point (382 = (255*3)/2)
+    if ((static_cast<int>(color.r) + color.g + color.b) > 382) {
+      return hw_white;
+    }
+    return hw_black;
+  }
+
+  // --- Step 2: Check for Primary/Secondary Colors ---
+  // If it's not gray, it's a color. We check which components are
+  // "on" (over 128) vs "off". This divides the RGB cube into 8 corners.
+  const bool r_on = (color.r > 128);
+  const bool g_on = (color.g > 128);
+  const bool b_on = (color.b > 128);
+
+  if (r_on) {
+    if (!b_on) {
+      return g_on ? hw_yellow : hw_red;
+    }
+
+    // At least red+blue high (but not gray) -> White
+    return hw_white;
+  } else {
+    return (b_on && g_on) ? hw_white : hw_black;
+  }
+}
+
+}  // namespace esphome::epaper_spi
diff --git a/esphome/components/epaper_spi/epaper_spi_jd79660.cpp b/esphome/components/epaper_spi/epaper_spi_jd79660.cpp
new file mode 100644
index 0000000000..1cd1087c6b
--- /dev/null
+++ b/esphome/components/epaper_spi/epaper_spi_jd79660.cpp
@@ -0,0 +1,227 @@
+#include "epaper_spi_jd79660.h"
+#include "colorconv.h"
+
+#include "esphome/core/log.h"
+
+namespace esphome::epaper_spi {
+static constexpr const char *const TAG = "epaper_spi.jd79660";
+
+/** Pixel color as 2bpp. Must match IC LUT values. */
+enum JD79660Color : uint8_t {
+  BLACK = 0b00,
+  WHITE = 0b01,
+  YELLOW = 0b10,
+  RED = 0b11,
+};
+
+/** Map RGB color to JD79660 BWYR hex color keys */
+static JD79660Color HOT color_to_hex(Color color) {
+  return color_to_bwyr(color, JD79660Color::BLACK, JD79660Color::WHITE, JD79660Color::YELLOW, JD79660Color::RED);
+}
+
+void EPaperJD79660::fill(Color color) {
+  // If clipping is active, fall back to base implementation
+  if (this->get_clipping().is_set()) {
+    EPaperBase::fill(color);
+    return;
+  }
+
+  const auto pixel_color = color_to_hex(color);
+
+  // We store 4 pixels per byte
+  this->buffer_.fill(pixel_color | (pixel_color << 2) | (pixel_color << 4) | (pixel_color << 6));
+}
+
+void HOT EPaperJD79660::draw_pixel_at(int x, int y, Color color) {
+  if (!this->rotate_coordinates_(x, y))
+    return;
+  const auto pixel_bits = color_to_hex(color);
+  const uint32_t pixel_position = x + y * this->get_width_internal();
+  // We store 4 pixels per byte at LSB offsets 6, 4, 2, 0
+  const uint32_t byte_position = pixel_position / 4;
+  const uint32_t bit_offset = 6 - ((pixel_position % 4) * 2);
+  const auto original = this->buffer_[byte_position];
+
+  this->buffer_[byte_position] = (original & (~(0b11 << bit_offset))) |  // mask old 2bpp
+                                 (pixel_bits << bit_offset);             // add new 2bpp
+}
+
+bool EPaperJD79660::reset() {
+  // On entry state RESET set step, next state will be RESET_END
+  if (this->state_ == EPaperState::RESET) {
+    this->step_ = FSMState::RESET_STEP0_H;
+  }
+
+  switch (this->step_) {
+    case FSMState::RESET_STEP0_H:
+      // Step #0: Reset H for some settle time.
+
+      ESP_LOGVV(TAG, "reset #0");
+      this->reset_pin_->digital_write(true);
+
+      this->reset_duration_ = SLEEP_MS_RESET0;
+      this->step_ = FSMState::RESET_STEP1_L;
+      return false;  // another loop: step #1 below
+
+    case FSMState::RESET_STEP1_L:
+      // Step #1: Reset L pulse for slightly >1.5ms.
+      // This is actual reset trigger.
+
+      ESP_LOGVV(TAG, "reset #1");
+
+      // As commented on SLEEP_MS_RESET1: Reset pulse must happen within time window.
+      // So do not use FSM loop, and avoid other calls/logs during pulse below.
+      this->reset_pin_->digital_write(false);
+      delay(SLEEP_MS_RESET1);
+      this->reset_pin_->digital_write(true);
+
+      this->reset_duration_ = SLEEP_MS_RESET2;
+      this->step_ = FSMState::RESET_STEP2_IDLECHECK;
+      return false;  // another loop: step #2 below
+
+    case FSMState::RESET_STEP2_IDLECHECK:
+      // Step #2: Basically finished. Check sanity, and move FSM to INITIALISE state
+      ESP_LOGVV(TAG, "reset #2");
+
+      if (!this->is_idle_()) {
+        // Expectation: Idle after reset + settle time.
+        // Improperly connected/unexpected hardware?
+        // Error path reproducable e.g. with disconnected VDD/... pins
+        // (optimally while busy_pin configured with local pulldown).
+        // -> Mark failed to avoid followup problems.
+        this->mark_failed(LOG_STR("Busy after reset"));
+      }
+      break;  // End state loop below
+
+    default:
+      // Unexpected step = bug?
+      this->mark_failed();
+  }
+
+  this->step_ = FSMState::INIT_STEP0_REGULARINIT;  // reset for initialize state
+  return true;
+}
+
+bool EPaperJD79660::initialise(bool partial) {
+  switch (this->step_) {
+    case FSMState::INIT_STEP0_REGULARINIT:
+      // Step #0: Regular init sequence
+      ESP_LOGVV(TAG, "init #0");
+      if (!EPaperBase::initialise(partial)) {  // Call parent impl
+        return false;                          // If parent should request another loop, do so
+      }
+
+      // Fast init requested + supported?
+      if (partial && (this->fast_update_length_ > 0)) {
+        this->step_ = FSMState::INIT_STEP1_FASTINIT;
+        this->wait_for_idle_(true);  // Must wait for idle before fastinit sequence in next loop
+        return false;                // another loop: step #1 below
+      }
+
+      break;  // End state loop below
+
+    case FSMState::INIT_STEP1_FASTINIT:
+      // Step #1: Fast init sequence
+      ESP_LOGVV(TAG, "init #1");
+      this->write_fastinit_();
+      break;  // End state loop below
+
+    default:
+      // Unexpected step = bug?
+      this->mark_failed();
+  }
+
+  this->step_ = FSMState::NONE;
+  return true;  // Finished: State transition waits for idle
+}
+
+bool EPaperJD79660::transfer_buffer_chunks_() {
+  size_t buf_idx = 0;
+  uint8_t bytes_to_send[MAX_TRANSFER_SIZE];
+  const uint32_t start_time = App.get_loop_component_start_time();
+  const auto buffer_length = this->buffer_length_;
+  while (this->current_data_index_ != buffer_length) {
+    bytes_to_send[buf_idx++] = this->buffer_[this->current_data_index_++];
+
+    if (buf_idx == sizeof bytes_to_send) {
+      this->start_data_();
+      this->write_array(bytes_to_send, buf_idx);
+      this->disable();
+      ESP_LOGVV(TAG, "Wrote %zu bytes at %ums", buf_idx, (unsigned) millis());
+      buf_idx = 0;
+
+      if (millis() - start_time > MAX_TRANSFER_TIME) {
+        // Let the main loop run and come back next loop
+        return false;
+      }
+    }
+  }
+
+  // Finished the entire dataset
+  if (buf_idx != 0) {
+    this->start_data_();
+    this->write_array(bytes_to_send, buf_idx);
+    this->disable();
+    ESP_LOGVV(TAG, "Wrote %zu bytes at %ums", buf_idx, (unsigned) millis());
+  }
+  // Cleanup for next transfer
+  this->current_data_index_ = 0;
+
+  // Finished with all buffer chunks
+  return true;
+}
+
+void EPaperJD79660::write_fastinit_() {
+  // Undocumented register sequence in vendor register range.
+  // Related to Fast Init/Update.
+  // Should likely happen after regular init seq and power on, but before refresh.
+  // Might only work for some models with certain factory MTP.
+  // Please do not change without knowledge to avoid breakage.
+
+  this->send_init_sequence_(this->fast_update_, this->fast_update_length_);
+}
+
+bool EPaperJD79660::transfer_data() {
+  // For now always send full frame buffer in chunks.
+  // JD79660 might support partial window transfers. But sample code missing.
+  // And likely minimal impact, solely on SPI transfer time into RAM.
+
+  if (this->current_data_index_ == 0) {
+    this->command(CMD_TRANSFER);
+  }
+
+  return this->transfer_buffer_chunks_();
+}
+
+void EPaperJD79660::refresh_screen([[maybe_unused]] bool partial) {
+  ESP_LOGV(TAG, "Refresh");
+  this->cmd_data(CMD_REFRESH, {(uint8_t) 0x00});
+}
+
+void EPaperJD79660::power_off() {
+  ESP_LOGV(TAG, "Power off");
+  this->cmd_data(CMD_POWEROFF, {(uint8_t) 0x00});
+}
+
+void EPaperJD79660::deep_sleep() {
+  ESP_LOGV(TAG, "Deep sleep");
+  // "Deepsleep between update": Ensure EPD sleep to avoid early hardware wearout!
+  this->cmd_data(CMD_DEEPSLEEP, {(uint8_t) 0xA5});
+
+  // Notes:
+  // - VDD: Some boards (Waveshare) with "clever reset logic" would allow switching off
+  //   EPD VDD by pulling reset pin low for longer time.
+  //   However, a) not all boards have this, b) reliable sequence timing is difficult,
+  //   c) saving is not worth it after deepsleep command above.
+  //   If needed: Better option is to drive VDD via MOSFET with separate enable pin.
+  //
+  // - Possible safe shutdown:
+  //   EPaperBase::on_safe_shutdown() may also trigger deep_sleep() again.
+  //   Regularly, in IDLE state, this does not make sense for this "deepsleep between update" model,
+  //   but SPI sequence should simply be ignored by sleeping receiver.
+  //   But if triggering during lengthy update, this quick SPI sleep sequence may have benefit.
+  //   Optimally, EPDs should even be set all white for longer storage.
+  //   But full sequence (>15s) not possible w/o app logic.
+}
+
+}  // namespace esphome::epaper_spi
diff --git a/esphome/components/epaper_spi/epaper_spi_jd79660.h b/esphome/components/epaper_spi/epaper_spi_jd79660.h
new file mode 100644
index 0000000000..4e488fe93e
--- /dev/null
+++ b/esphome/components/epaper_spi/epaper_spi_jd79660.h
@@ -0,0 +1,145 @@
+#pragma once
+
+#include "epaper_spi.h"
+
+namespace esphome::epaper_spi {
+
+/**
+ * JD7966x IC driver implementation
+ *
+ * Currently tested with:
+ * - JD79660 (max res: 200x200)
+ *
+ * May also work for other JD7966x chipset family members with minimal adaptations.
+ *
+ * Capabilities:
+ * - HW frame buffer layout:
+ *   4 colors (gray0..3, commonly BWYR). Bytes consist of 4px/2bpp.
+ *   Width must be rounded to multiple of 4.
+ * - Fast init/update (shorter wave forms): Yes. Controlled by CONF_FULL_UPDATE_EVERY.
+ *   Needs undocumented fastinit sequence, based on likely vendor specific MTP content.
+ * - Partial transfer (transfer only changed window): No. Maybe possible by HW.
+ * - Partial refresh (refresh only changed window): No. Likely HW limit.
+ *
+ * @internal \c final saves few bytes by devirtualization. Remove \c final when subclassing.
+ */
+class EPaperJD79660 final : public EPaperBase {
+ public:
+  EPaperJD79660(const char *name, uint16_t width, uint16_t height, const uint8_t *init_sequence,
+                size_t init_sequence_length, const uint8_t *fast_update, uint16_t fast_update_length)
+      : EPaperBase(name, width, height, init_sequence, init_sequence_length, DISPLAY_TYPE_COLOR),
+        fast_update_(fast_update),
+        fast_update_length_(fast_update_length) {
+    this->row_width_ = (width + 3) / 4;  // Fix base class calc (2bpp instead of 1bpp)
+    this->buffer_length_ = this->row_width_ * height;
+  }
+
+  void fill(Color color) override;
+
+ protected:
+  /** Draw colored pixel into frame buffer */
+  void draw_pixel_at(int x, int y, Color color) override;
+
+  /** Reset (multistep sequence)
+   * @pre this->reset_pin_ != nullptr // cv.Required check
+   * @post Should be idle on successful reset. Can mark failures.
+   */
+  bool reset() override;
+
+  /** Initialise (multistep sequence) */
+  bool initialise(bool partial) override;
+
+  /** Buffer transfer */
+  bool transfer_data() override;
+
+  /** Power on: Already part of init sequence (likely needed there before transferring buffers).
+   * So nothing to do in FSM state.
+   */
+  void power_on() override {}
+
+  /** Refresh screen
+   * @param partial Ignored: Needed earlier in \a ::initialize
+   * @pre Must be idle.
+   * @post Should return to idle later after processing.
+   */
+  void refresh_screen([[maybe_unused]] bool partial) override;
+
+  /** Power off
+   * @pre Must be idle.
+   * @post Should return to idle later after processing.
+   *       (latter will take long period like ~15-20s on actual refresh!)
+   */
+  void power_off() override;
+
+  /** Deepsleep: Must be used to avoid hardware wearout!
+   * @pre Must be idle.
+   * @post Will go busy, and not return idle till ::reset!
+   */
+  void deep_sleep() override;
+
+  /** Internal: Send fast init sequence via undocumented vendor registers
+   * @pre Must be directly after regular ::initialise sequence, before ::transfer_data
+   * @pre Must be idle.
+   * @post Should return to idle later after processing.
+   */
+  void write_fastinit_();
+
+  /** Internal: Send raw buffer in chunks
+   * \retval true Finished
+   * \retval false Loop time elapsed. Need to call again next loop.
+   */
+  bool transfer_buffer_chunks_();
+
+  /** @name IC commands @{ */
+  static constexpr uint8_t CMD_POWEROFF = 0x02;
+  static constexpr uint8_t CMD_DEEPSLEEP = 0x07;
+  static constexpr uint8_t CMD_TRANSFER = 0x10;
+  static constexpr uint8_t CMD_REFRESH = 0x12;
+  /** @} */
+
+  /** State machine constants for \a step_ */
+  enum class FSMState : uint8_t {
+    NONE = 0,  //!< Initial/default value: Unused
+
+    /* Reset state steps */
+    RESET_STEP0_H,
+    RESET_STEP1_L,
+    RESET_STEP2_IDLECHECK,
+
+    /* Init state steps */
+    INIT_STEP0_REGULARINIT,
+    INIT_STEP1_FASTINIT,
+  };
+
+  /** Wait time (millisec) for first reset phase: High
+   *
+   * Wait via FSM loop.
+   */
+  static constexpr uint16_t SLEEP_MS_RESET0 = 200;
+
+  /** Wait time (millisec) for second reset phase: Low
+   *
+   * Holding Reset Low too long may trigger "clever reset" logic
+   * of e.g. Waveshare Rev2 boards: VDD is shut down via MOSFET, and IC
+   * will not report idle anymore!
+   * FSM loop may spuriously increase delay, e.g. >16ms.
+   * Therefore, sync wait below, as allowed (code rule "delays > 10ms not permitted"),
+   * yet only slightly exceeding known IC min req of >1.5ms.
+   */
+  static constexpr uint16_t SLEEP_MS_RESET1 = 2;
+
+  /** Wait time (millisec) for third reset phase: High
+   *
+   * Wait via FSM loop.
+   */
+  static constexpr uint16_t SLEEP_MS_RESET2 = 200;
+
+  // properties initialised in the constructor
+  const uint8_t *const fast_update_{};
+  const uint16_t fast_update_length_{};
+
+  /** Counter for tracking substeps within FSM state */
+  FSMState step_{FSMState::NONE};
+};
+
+}  // namespace esphome::epaper_spi
diff --git a/esphome/components/epaper_spi/models/jd79660.py b/esphome/components/epaper_spi/models/jd79660.py
new file mode 100644
index 0000000000..2d8830ebd2
--- /dev/null
+++ b/esphome/components/epaper_spi/models/jd79660.py
@@ -0,0 +1,86 @@
+import esphome.codegen as cg
+from esphome.components.mipi import flatten_sequence
+import esphome.config_validation as cv
+from esphome.const import CONF_BUSY_PIN, CONF_RESET_PIN
+from esphome.core import ID
+
+from ..display import CONF_INIT_SEQUENCE_ID
+from . import EpaperModel
+
+
+class JD79660(EpaperModel):
+    def __init__(self, name, class_name="EPaperJD79660", fast_update=None, **kwargs):
+        super().__init__(name, class_name, **kwargs)
+        self.fast_update = fast_update
+
+    def option(self, name, fallback=cv.UNDEFINED) -> cv.Optional | cv.Required:
+        # Validate required pins, as C++ code will assume existence
+        if name in (CONF_RESET_PIN, CONF_BUSY_PIN):
+            return cv.Required(name)
+
+        # Delegate to parent
+        return super().option(name, fallback)
+
+    def get_constructor_args(self, config) -> tuple:
+        # Resembles init_sequence handling for fast_update config
+        if self.fast_update is None:
+            fast_update = cg.nullptr, 0
+        else:
+            flat_fast_update = flatten_sequence(self.fast_update)
+            fast_update = (
+                cg.static_const_array(
+                    ID(
+                        config[CONF_INIT_SEQUENCE_ID].id + "_fast_update", type=cg.uint8
+                    ),
+                    flat_fast_update,
+                ),
+                len(flat_fast_update),
+            )
+        return (*fast_update,)
+
+
+jd79660 = JD79660(
+    "jd79660",
+    # Specified refresh times are ~20s (full) or ~15s (fast) due to BWRY.
+    # So disallow low update intervals (with safety margin), to avoid e.g. FSM update loops.
+    # Even less frequent intervals (min/h) highly recommended to optimize lifetime!
+    minimum_update_interval="30s",
+    # SPI rate: From spec comparisons, IC should allow SCL write cycles up to 10MHz rate.
+    # Existing code samples also prefer 10MHz. So justifies as default.
+    # Decrease value further in user config if needed (e.g. poor cabling).
+    data_rate="10MHz",
+    # No need to set optional reset_duration:
+    # Code requires multistep reset sequence with precise timings
+    # according to data sheet or samples.
+)
+
+# Waveshare 1.54-G
+#
+# Device may have specific factory provisioned MTP content to facilitate vendor register features like fast init.
+# Vendor specific init derived from vendor sample code
+# <https://github.com/waveshareteam/e-Paper/blob/master/E-paper_Separate_Program/1in54_e-Paper_G/ESP32/EPD_1in54g.cpp>
+# Compatible MIT license, see esphome/LICENSE file.
+#
+# fmt: off
+jd79660.extend(
+    "Waveshare-1.54in-G",
+    width=200,
+    height=200,
+
+    initsequence=(
+        (0x4D, 0x78,),
+        (0x00, 0x0F, 0x29,),
+        (0x06, 0x0d, 0x12, 0x30, 0x20, 0x19, 0x2a, 0x22,),
+        (0x50, 0x37,),
+        (0x61, 200 // 256, 200 % 256, 200 // 256, 200 % 256,),  # RES: 200x200 fixed
+        (0xE9, 0x01,),
+        (0x30, 0x08,),
+        # Power On (0x04): Must be early part of init seq = Disabled later!
+        (0x04,),
+    ),
+    fast_update=(
+        (0xE0, 0x02,),
+        (0xE6, 0x5D,),
+        (0xA5, 0x00,),
+    ),
+)
diff --git a/tests/components/epaper_spi/test.esp32-s3-idf.yaml b/tests/components/epaper_spi/test.esp32-s3-idf.yaml
index 621a819c3c..333ab567cd 100644
--- a/tests/components/epaper_spi/test.esp32-s3-idf.yaml
+++ b/tests/components/epaper_spi/test.esp32-s3-idf.yaml
@@ -25,6 +25,22 @@ display:
     lambda: |-
       it.circle(64, 64, 50, Color::BLACK);
 
+  - platform: epaper_spi
+    spi_id: spi_bus
+    model: waveshare-1.54in-G
+    cs_pin:
+      allow_other_uses: true
+      number: GPIO5
+    dc_pin:
+      allow_other_uses: true
+      number: GPIO17
+    reset_pin:
+      allow_other_uses: true
+      number: GPIO16
+    busy_pin:
+      allow_other_uses: true
+      number: GPIO4
+
   - platform: epaper_spi
     spi_id: spi_bus
     model: waveshare-2.13in-v3

From a43e3e59483a239467d1db8201522db25291371d Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Sat, 7 Feb 2026 22:19:20 +0100
Subject: [PATCH 10/10] [dashboard] Close WebSocket after process exit to
 prevent zombie connections (#13834)

---
 esphome/dashboard/web_server.py    |  1 +
 tests/dashboard/test_web_server.py | 24 +++++++++++++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/esphome/dashboard/web_server.py b/esphome/dashboard/web_server.py
index f94d8eea22..da50279864 100644
--- a/esphome/dashboard/web_server.py
+++ b/esphome/dashboard/web_server.py
@@ -317,6 +317,7 @@ class EsphomeCommandWebSocket(CheckOriginMixin, tornado.websocket.WebSocketHandl
             # Check if the proc was not forcibly closed
             _LOGGER.info("Process exited with return code %s", returncode)
             self.write_message({"event": "exit", "code": returncode})
+            self.close()
 
     def on_close(self) -> None:
         # Check if proc exists (if 'start' has been run)
diff --git a/tests/dashboard/test_web_server.py b/tests/dashboard/test_web_server.py
index 10ca6061e6..7642876ee5 100644
--- a/tests/dashboard/test_web_server.py
+++ b/tests/dashboard/test_web_server.py
@@ -29,7 +29,7 @@ from esphome.dashboard.entries import (
     bool_to_entry_state,
 )
 from esphome.dashboard.models import build_importable_device_dict
-from esphome.dashboard.web_server import DashboardSubscriber
+from esphome.dashboard.web_server import DashboardSubscriber, EsphomeCommandWebSocket
 from esphome.zeroconf import DiscoveredImport
 
 from .common import get_fixture_path
@@ -1654,3 +1654,25 @@ async def test_websocket_check_origin_multiple_trusted_domains(
             assert data["event"] == "initial_state"
         finally:
             ws.close()
+
+
+def test_proc_on_exit_calls_close() -> None:
+    """Test _proc_on_exit sends exit event and closes the WebSocket."""
+    handler = Mock(spec=EsphomeCommandWebSocket)
+    handler._is_closed = False
+
+    EsphomeCommandWebSocket._proc_on_exit(handler, 0)
+
+    handler.write_message.assert_called_once_with({"event": "exit", "code": 0})
+    handler.close.assert_called_once()
+
+
+def test_proc_on_exit_skips_when_already_closed() -> None:
+    """Test _proc_on_exit does nothing when WebSocket is already closed."""
+    handler = Mock(spec=EsphomeCommandWebSocket)
+    handler._is_closed = True
+
+    EsphomeCommandWebSocket._proc_on_exit(handler, 0)
+
+    handler.write_message.assert_not_called()
+    handler.close.assert_not_called()