Bug in application/src/mqtt.cpp

[ani8897]

The struct on line 206 of application/src/mqtt.cpp is not initialized properly

mqtt_service_config config = {
        mqtt_server,
        mqtt_client_id,
        mqtt_username,
        mqtt_password,
        mqtt_cert,
        mqtt_cert_key,
        mqtt_ca_root};

The third field should be topic which has been skipped during initialization. This bug has a serious cascading effect as we cannot initialize a secure MQTT connection by exporting environment variables.