MQTT Publish on unconnected MQTT Client

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#MQTT Publish on unconnected MQTT Client

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theHuanter 07/17/2023 12:47 PM

If the my code is calling mqtt.publish on a disconnected MQTT Client (I killed the broker to see what happens) it tries to reconnect using the reconnect strategy (default). During this time a publish might happen, which gets blocked until the MQTT Client has connected and then still sends this message.

Can I set a timeout for a publish to happen?

I moved the publish into a task as well and triggered multiple publish. They all got stuck and have been send once the client came back online. Is there a way to cancel a task after a duration n? (that would be the walkaround for the timout of a publish)

theHuanter 07/17/2023 01:12 PM

I could think of something like that:

task:: 
  publish/Task := task:: 
    client.publish REQUEST_TOPIC payload
    logger.debug "publish has been send"
  sleep --ms=2000
  publish.cancel

floitsch 07/17/2023 02:02 PM

Typically we use with_timeout: ...

floitsch 07/17/2023 02:03 PM

so:

with_timeout --ms=5_000:
  client.publish REQUEST_TOPIC payload

4 messages in total