[bluetooth_proxy] Remove ESPBTUUID dependency to save 296 bytes of flash (#10213)

esphome/components/ble_client/__init__.py

@@ -286,6 +286,7 @@ async def remove_bond_to_code(config, action_id, template_arg, args):
 async def to_code(config):
     # Register the loggers this component needs
     esp32_ble.register_bt_logger(BTLoggers.GATT, BTLoggers.SMP)
+    cg.add_define("USE_ESP32_BLE_UUID")
 
     var = cg.new_Pvariable(config[CONF_ID])
     await cg.register_component(var, config)

esphome/components/bluetooth_proxy/bluetooth_connection.cpp

@@ -12,16 +12,30 @@ namespace esphome::bluetooth_proxy {
 
 static const char *const TAG = "bluetooth_proxy.connection";
 
+// This function is allocation-free and directly packs UUIDs into the output array
+// using precalculated constants for the Bluetooth base UUID
 static void fill_128bit_uuid_array(std::array<uint64_t, 2> &out, esp_bt_uuid_t uuid_source) {
-  esp_bt_uuid_t uuid = espbt::ESPBTUUID::from_uuid(uuid_source).as_128bit().get_uuid();
-  out[0] = ((uint64_t) uuid.uuid.uuid128[15] << 56) | ((uint64_t) uuid.uuid.uuid128[14] << 48) |
-           ((uint64_t) uuid.uuid.uuid128[13] << 40) | ((uint64_t) uuid.uuid.uuid128[12] << 32) |
-           ((uint64_t) uuid.uuid.uuid128[11] << 24) | ((uint64_t) uuid.uuid.uuid128[10] << 16) |
-           ((uint64_t) uuid.uuid.uuid128[9] << 8) | ((uint64_t) uuid.uuid.uuid128[8]);
-  out[1] = ((uint64_t) uuid.uuid.uuid128[7] << 56) | ((uint64_t) uuid.uuid.uuid128[6] << 48) |
-           ((uint64_t) uuid.uuid.uuid128[5] << 40) | ((uint64_t) uuid.uuid.uuid128[4] << 32) |
-           ((uint64_t) uuid.uuid.uuid128[3] << 24) | ((uint64_t) uuid.uuid.uuid128[2] << 16) |
-           ((uint64_t) uuid.uuid.uuid128[1] << 8) | ((uint64_t) uuid.uuid.uuid128[0]);
+  // Bluetooth base UUID: 00000000-0000-1000-8000-00805F9B34FB
+  // out[0] = bytes 8-15 (big-endian)
+  // - For 128-bit UUIDs: use bytes 8-15 as-is
+  // - For 16/32-bit UUIDs: insert into bytes 12-15, use 0x00001000 for bytes 8-11
+  out[0] = uuid_source.len == ESP_UUID_LEN_128
+               ? (((uint64_t) uuid_source.uuid.uuid128[15] << 56) | ((uint64_t) uuid_source.uuid.uuid128[14] << 48) |
+                  ((uint64_t) uuid_source.uuid.uuid128[13] << 40) | ((uint64_t) uuid_source.uuid.uuid128[12] << 32) |
+                  ((uint64_t) uuid_source.uuid.uuid128[11] << 24) | ((uint64_t) uuid_source.uuid.uuid128[10] << 16) |
+                  ((uint64_t) uuid_source.uuid.uuid128[9] << 8) | ((uint64_t) uuid_source.uuid.uuid128[8]))
+               : (((uint64_t) (uuid_source.len == ESP_UUID_LEN_16 ? uuid_source.uuid.uuid16 : uuid_source.uuid.uuid32)
+                   << 32) |
+                  0x00001000ULL);  // Base UUID bytes 8-11
+  // out[1] = bytes 0-7 (big-endian)
+  // - For 128-bit UUIDs: use bytes 0-7 as-is
+  // - For 16/32-bit UUIDs: use precalculated base UUID constant
+  out[1] = uuid_source.len == ESP_UUID_LEN_128
+               ? ((uint64_t) uuid_source.uuid.uuid128[7] << 56) | ((uint64_t) uuid_source.uuid.uuid128[6] << 48) |
+                     ((uint64_t) uuid_source.uuid.uuid128[5] << 40) | ((uint64_t) uuid_source.uuid.uuid128[4] << 32) |
+                     ((uint64_t) uuid_source.uuid.uuid128[3] << 24) | ((uint64_t) uuid_source.uuid.uuid128[2] << 16) |
+                     ((uint64_t) uuid_source.uuid.uuid128[1] << 8) | ((uint64_t) uuid_source.uuid.uuid128[0])
+               : 0x800000805F9B34FBULL;  // Base UUID bytes 0-7: 80-00-00-80-5F-9B-34-FB
 }
 
 // Helper to fill UUID in the appropriate format based on client support and UUID type

esphome/components/esp32_ble/ble_uuid.cpp

@@ -1,6 +1,7 @@
 #include "ble_uuid.h"
 
 #ifdef USE_ESP32
+#ifdef USE_ESP32_BLE_UUID
 
 #include <cstring>
 #include <cstdio>
@@ -190,4 +191,5 @@ std::string ESPBTUUID::to_string() const {
 
 }  // namespace esphome::esp32_ble
 
-#endif
+#endif  // USE_ESP32_BLE_UUID
+#endif  // USE_ESP32

esphome/components/esp32_ble/ble_uuid.h

@@ -1,9 +1,11 @@
 #pragma once
 
+#include "esphome/core/defines.h"
 #include "esphome/core/hal.h"
 #include "esphome/core/helpers.h"
 
 #ifdef USE_ESP32
+#ifdef USE_ESP32_BLE_UUID
 
 #include <string>
 #include <esp_bt_defs.h>
@@ -42,4 +44,5 @@ class ESPBTUUID {
 
 }  // namespace esphome::esp32_ble
 
-#endif
+#endif  // USE_ESP32_BLE_UUID
+#endif  // USE_ESP32

esphome/components/esp32_ble_beacon/__init__.py

@@ -65,6 +65,8 @@ FINAL_VALIDATE_SCHEMA = esp32_ble.validate_variant
 
 
 async def to_code(config):
+    cg.add_define("USE_ESP32_BLE_UUID")
+
     uuid = config[CONF_UUID].hex
     uuid_arr = [
         cg.RawExpression(f"0x{uuid[i : i + 2]}") for i in range(0, len(uuid), 2)

esphome/components/esp32_ble_server/__init__.py

@@ -529,6 +529,7 @@ async def to_code_characteristic(service_var, char_conf):
 async def to_code(config):
     # Register the loggers this component needs
     esp32_ble.register_bt_logger(BTLoggers.GATT, BTLoggers.SMP)
+    cg.add_define("USE_ESP32_BLE_UUID")
 
     var = cg.new_Pvariable(config[CONF_ID])
 

esphome/components/esp32_ble_tracker/__init__.py

@@ -373,6 +373,7 @@ async def _add_ble_features():
     # Add feature-specific defines based on what's needed
     if BLEFeatures.ESP_BT_DEVICE in _required_features:
         cg.add_define("USE_ESP32_BLE_DEVICE")
+        cg.add_define("USE_ESP32_BLE_UUID")
 
 
 ESP32_BLE_START_SCAN_ACTION_SCHEMA = cv.Schema(

esphome/components/esp32_ble_tracker/esp32_ble_tracker.h

@@ -33,10 +33,12 @@ enum AdvertisementParserType {
   RAW_ADVERTISEMENTS,
 };
 
+#ifdef USE_ESP32_BLE_UUID
 struct ServiceData {
   ESPBTUUID uuid;
   adv_data_t data;
 };
+#endif
 
 #ifdef USE_ESP32_BLE_DEVICE
 class ESPBLEiBeacon {

esphome/core/defines.h

@@ -154,6 +154,7 @@
 #define USE_ESP32_BLE_CLIENT
 #define USE_ESP32_BLE_DEVICE
 #define USE_ESP32_BLE_SERVER
+#define USE_ESP32_BLE_UUID
 #define USE_ESP32_BLE_ADVERTISING
 #define USE_I2C
 #define USE_IMPROV