Fix callbacks

main/event.cpp

@@ -18,8 +18,9 @@ void add_wlan_connection_status_callback(connection_status_callback_t callback)
         wlan_connection_status_callback = callback;
     }
     else {
-        wlan_connection_status_callback = [wlan_connection_status_callback, callback](connection_status_t status){
-            wlan_connection_status_callback(status);
+        connection_status_callback_t old_callback = wlan_connection_status_callback;
+        wlan_connection_status_callback = [old_callback, callback](connection_status_t status){
+            old_callback(status);
             callback(status);
         };
     }
@@ -41,8 +42,9 @@ void add_mqtt_connection_status_callback(connection_status_callback_t callback)
         mqtt_connection_status_callback = callback;
     }
     else {
-        mqtt_connection_status_callback = [mqtt_connection_status_callback, callback](connection_status_t status){
-            mqtt_connection_status_callback(status);
+        connection_status_callback_t old_callback = mqtt_connection_status_callback;
+        mqtt_connection_status_callback = [old_callback, callback](connection_status_t status){
+            old_callback(status);
             callback(status);
         };
     }
@@ -88,8 +90,9 @@ void add_combined_mqtt_connection_status_callback(connection_status_callback_t c
         });
     }
     else {
-        combined_mqtt_connection_status_callback = [combined_mqtt_connection_status_callback, callback](connection_status_t status){
-            combined_mqtt_connection_status_callback(status);
+        connection_status_callback_t old_callback = combined_mqtt_connection_status_callback;
+        combined_mqtt_connection_status_callback = [old_callback, callback](connection_status_t status){
+            old_callback(status);
             callback(status);
         };
     }