firebase MQTT actions

I am building google action with dialogflow. I also deployed nodejs fulfillment in firebase. Inoder to connect to the IoT devices which are connected to google homes, I am using MQTT protocol, VerneMQ is the broker which I am using. I executed the code in local machine and I was able to subscribe to the message the publish by the google home. But when i upload this code to firebase, I was not able to establish the connection. As their are limitation to debug firebase, I put logs and i find that the device is not connected to MQTT broker. What should I do to connect? Is firebase support MQTT connection?