Resolving problems if your MQTT client disconnects unexpectedly

Discover what is going wrong when an MQTT client is unexpectedly disconnected from a telemetry channel.

Procedure

If your MQTT client connects successfully and later disconnects with no apparent reason, consider the following reasons to diagnose the problem:

• The queue manager, MQXR service, or telemetry channel is not running.

  Start the queue manager, MQXR service, or telemetry channel. Try reconnecting the MQTT client, and check that this solution rectifies the problem.

• Another client is started and connects with the same client ID.

  In this case, IBM MQ accepts the connection from the second MQTT client and forcefully disconnects the first MQTT client.

• The MQTT client accesses a topic that it is not authorized to, either for publishing or subscribing.

  IBM MQ disconnects the MQTT client.

• The TCP/IP connection is no longer active.

  Diagnose and fix the problem with your TCP/IP connection, and try reconnecting the MQTT client.