Button to publish to MQTT, LED to receive MQTT subscriptions about ardulink-2

[pfichtner]

Not the right place to ask, but let me give you some hints as this could be done very easy:
either use Ardulink Console or ardulink-mqtt. Enable listening on the digital pin the button is connected to by either clicking the button "Digital sensor panel" in the UI or passing "-d X" where X is digital pin the button is connected to, to ardulink-mqtt

For the LED you just have to publish a message to the broker. The default topic ardulink is listening to is home/devices/ardulink so when sending a message "1" to the topic "home/devices/ardulink/Dx/value/set" where x is the digital pin the LED is connected to, your LED should lighten up