[paho-dev] java: adding an modern intuitive interface

[Luc Baumann <lb@xxxxxxxxx>]

Hi together

before I something stupid like develop antoher mqtt-library I wanted to ask you if changes to mqtt (java) which includes new Interfaces are welcome.

Reason: We use patho-mqtt-java in multiple projects and I always end up writing Wrapper-Classes to fix some shortcomings (one example attached, ignore the compression).

I suggest these (with more overloads for qos, and retained):

subscribe(String topic, Consumer<byte[]> consumer);

publish(String topic, byte[] payload);

Also we run into problems with the subscription being lost when subscribing to multiple topics, so I'd like to fix that as well.

If this contribution is welcome I'll prepare a pull-request.

Thanks and best regards

Luc

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