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https://issues.apache.org/jira/browse/BEAM-9647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismaël Mejía reassigned BEAM-9647:
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Assignee: Michael Jacoby
> No MQTT connection possible because clientId is too long
> --------------------------------------------------------
>
> Key: BEAM-9647
> URL: https://issues.apache.org/jira/browse/BEAM-9647
> Project: Beam
> Issue Type: Bug
> Components: io-java-mqtt
> Affects Versions: 2.19.0
> Reporter: Michael Jacoby
> Assignee: Michael Jacoby
> Priority: Critical
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> The used FuseSource MQTT library only supports (outdated) MQTT version 3.1.
> According to MQTT v3.1 protocol
> ([https://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#connect])
> a clientId must be <= 23 characters, otherwise the connection must be
> rejected by the server. However, in MqttIO
> ([https://github.com/apache/beam/blob/master/sdks/java/io/mqtt/src/main/java/org/apache/beam/sdk/io/mqtt/MqttIO.java#L223])
> the clientId is always appended with a random UUID which itself is longer
> than 23 characters. This implies that establishing a connection this way
> should never work.
> FYI: If you don't encounter this error when testing it may be because some
> servers do not correctly implement the standard and accept connections with a
> clientId longer than 23 characters (e.g. HiveMQ) or crash and/or don't
> respond to such connection requests at all.
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