feat(mqtt): update mqtt interface with new methods #19
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Summary
This PR adds 2 new methods to the MQTT interface and modifies an existing method. It also updates the Paho client and unit tests to reflect the changes.
New methods added,
connected()- Check MQTT connection statusset_will(...)- Set a last will message that will be sent when the client disconnects abruptlyExisting methods updated,
publish(...)- A newbooleanflag has been added to allow users to indicate if this message should be retained in the broker