diff --git a/Doxyfile b/Doxyfile
index ab6a0e8252..956cf7c97a 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -48,7 +48,7 @@ PROJECT_NAME           = ESPHome
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 2025.8.3
+PROJECT_NUMBER         = 2025.8.4
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/esphome/components/kmeteriso/kmeteriso.cpp b/esphome/components/kmeteriso/kmeteriso.cpp
index d20e07460b..36f6d74ba0 100644
--- a/esphome/components/kmeteriso/kmeteriso.cpp
+++ b/esphome/components/kmeteriso/kmeteriso.cpp
@@ -33,7 +33,7 @@ void KMeterISOComponent::setup() {
   }
 
   uint8_t read_buf[4] = {1};
-  if (!this->read_register(KMETER_ERROR_STATUS_REG, read_buf, 1)) {
+  if (!this->read_bytes(KMETER_ERROR_STATUS_REG, read_buf, 1)) {
     ESP_LOGCONFIG(TAG, "Could not read from the device.");
     this->error_code_ = COMMUNICATION_FAILED;
     this->mark_failed();
diff --git a/esphome/components/light/light_state.h b/esphome/components/light/light_state.h
index 94b81dee61..f25f870715 100644
--- a/esphome/components/light/light_state.h
+++ b/esphome/components/light/light_state.h
@@ -12,6 +12,7 @@
 #include "light_transformer.h"
 
 #include <vector>
+#include <strings.h>
 
 namespace esphome {
 namespace light {
diff --git a/esphome/components/sen5x/sen5x.cpp b/esphome/components/sen5x/sen5x.cpp
index 0f27ec1b10..f3222221a2 100644
--- a/esphome/components/sen5x/sen5x.cpp
+++ b/esphome/components/sen5x/sen5x.cpp
@@ -38,6 +38,7 @@ void SEN5XComponent::setup() {
       this->mark_failed();
       return;
     }
+    delay(20);  // per datasheet
 
     uint16_t raw_read_status;
     if (!this->read_data(raw_read_status)) {
diff --git a/esphome/const.py b/esphome/const.py
index 5ed9092454..49b9a83c7f 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -4,7 +4,7 @@ from enum import Enum
 
 from esphome.enum import StrEnum
 
-__version__ = "2025.8.3"
+__version__ = "2025.8.4"
 
 ALLOWED_NAME_CHARS = "abcdefghijklmnopqrstuvwxyz0123456789-_"
 VALID_SUBSTITUTIONS_CHARACTERS = (
diff --git a/tests/components/light/test.nrf52-adafruit.yaml b/tests/components/light/test.nrf52-adafruit.yaml
new file mode 100644
index 0000000000..cb421ed4bb
--- /dev/null
+++ b/tests/components/light/test.nrf52-adafruit.yaml
@@ -0,0 +1,19 @@
+esphome:
+  on_boot:
+    then:
+      - light.toggle: test_binary_light
+
+output:
+  - platform: gpio
+    id: test_binary
+    pin: 0
+
+light:
+  - platform: binary
+    id: test_binary_light
+    name: Binary Light
+    output: test_binary
+    effects:
+      - strobe:
+    on_state:
+      - logger.log: Binary light state changed
diff --git a/tests/components/light/test.nrf52-mcumgr.yaml b/tests/components/light/test.nrf52-mcumgr.yaml
new file mode 100644
index 0000000000..cb421ed4bb
--- /dev/null
+++ b/tests/components/light/test.nrf52-mcumgr.yaml
@@ -0,0 +1,19 @@
+esphome:
+  on_boot:
+    then:
+      - light.toggle: test_binary_light
+
+output:
+  - platform: gpio
+    id: test_binary
+    pin: 0
+
+light:
+  - platform: binary
+    id: test_binary_light
+    name: Binary Light
+    output: test_binary
+    effects:
+      - strobe:
+    on_state:
+      - logger.log: Binary light state changed