Use Kotlin native MQTT client for Kotlin code

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Expected Behavior

Kotlin native MQTT client is used in Kotlin code.

Actual Behavior

Eclipse Paho MQTT client is used. Not cool.

Candidates

• https://github.com/davidepianca98/KMQTT

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Done as of rev. a0e2ba81349293e99848c83ae6ff7146b5257e90