add: mqtt status client

src/models/relay.c

@@ -15,6 +15,7 @@ relay_create(uint8_t number)
     new_relay->name[0] = '\0';
 
     new_relay->is_on = -1;
+    new_relay->sent_to_broker = 0;
 
     uuid_t off_id;
     memset(off_id, 0, sizeof(uuid_t));