feat: do not subscribe proxy gateway child device online/offline state message

Author: SusanPhevos

custom_components/xiaomi_home/miot/miot_mips.py

@@ -998,9 +998,11 @@ def on_state_msg(topic: str, payload: str, ctx: Any) -> None:
                     did, MIoTDeviceState.ONLINE if msg['event'] == 'online'
                     else MIoTDeviceState.OFFLINE, ctx)
 
-        if did.startswith('blt.'):
-        # MIoT cloud may not publish BLE device online/offline state message.
-        # Do not subscribe BLE device online/offline state.
+        if did.startswith('blt.') or did.startswith('proxy.'):
+        # MIoT cloud may not publish BLE device or proxy gateway child device
+        # online/offline state message.
+        # Do not subscribe BLE device or proxy gateway child device
+        # online/offline state.
             return True
         return self.__reg_broadcast_external(
             topic=topic, handler=on_state_msg, handler_ctx=handler_ctx)