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Note

Prior to release 4.0.22, MQTT Transmission has a max inflight message limit of 10. Depending on the frequency of MQTT publishes and the QOS selected, you may see the error "Too many publishes in progress" in the Ignition logs.

There are a couple of options to work around this now:

  • Slow down the publish rate if possible
  • Use QoS0 for publishing
  • Set up multiple clients and spread the load across them

The max inflight message for release 4.0.22 and newer is 500

Logging Errors

If you have not enabled the RPC Client, under Sets RPC Client and attempt to perform the system.cirruslink.transmission.publish call, the logs will show:

Image Added


If the RPC Client is enabled under Sets RPC Clientbut is misconfigured under Server RPC Client Connection, the logs will show errors similar to the one below:

 Image Added

Additional Resources