[mqtt] Add LN882X (LN882H) platform support (#17297)

Co-authored-by: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>

esphome/components/mqtt/__init__.py

@@ -57,6 +57,7 @@ from esphome.const import (
     PLATFORM_BK72XX,
     PLATFORM_ESP32,
     PLATFORM_ESP8266,
+    PLATFORM_LN882X,
     PLATFORM_RTL87XX,
     PlatformFramework,
 )
@@ -318,7 +319,15 @@ CONFIG_SCHEMA = cv.All(
         }
     ),
     validate_config,
-    cv.only_on([PLATFORM_ESP32, PLATFORM_ESP8266, PLATFORM_BK72XX, PLATFORM_RTL87XX]),
+    cv.only_on(
+        [
+            PLATFORM_BK72XX,
+            PLATFORM_ESP32,
+            PLATFORM_ESP8266,
+            PLATFORM_LN882X,
+            PLATFORM_RTL87XX,
+        ]
+    ),
     _consume_mqtt_sockets,
 )
 

tests/components/mqtt/test.ln882x-ard.yaml

@@ -0,0 +1,2 @@
+packages:
+  common: !include common.yaml