GCP IoT connection closed because MQTT keep-alive check failed

[Agron Ce]

GCP IoT Core showing error: "mqtt: SERVER: The connection was closed because MQTT keep-alive check failed." 

Error Message: https://imgur.com/2Aragbp

Under the monitoring tab, I can see data sent/received, however I believe the above error is preventing the data being sent to firebase.

Have tried rebuilding the avr-iot device, which indicate data is being sent with no errors.

Is there a specific reason why I might be getting this error?

[Ali T (Cloud Platform Support)]

Hi,

Given the error message, I would suspect you device didn’t emit a heartbeat for a while resulting in the MQTT connection to close. I would suggest going over the possible causes of this error and adjust the heartbeat frequency accordingly.