Make MQTT sink "retain" flag configurable

[miquelruiz]

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Use Cases

I would like the messages sent to the MQTT sink to be retained by the server.

Attempted Solutions

The MQTT client's publish function accepts a retain flag, which the sink service hardcodes to false

Proposal

I think it should be rather easy to expose a "retain" boolean configuration flag for the sink that allows users to configure this.

I'd be happy to give it a go and submit a PR myself, but opening this issue first so the feature can be considered before I spend time on it.

References

No response

Version

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[jszwedko]

Good spot @miquelruiz