Integration with Home Assistant

Ok, just an update on this - I had a go, and it needed some changes but it works great!

I tried to document it at https://github.com/espruino/EspruinoHub#home-assistant-integration, but basically:

• Update to the latest EspruinoHub
  
• Enable the MQTT option in HomeAssistant and point it at 'localhost'
  
• All your devices appear!
  
  

On the Bangle, or some other Espruino device you can now do:

var value = false;

function update() {
  g.clear();
  g.setFontVector(30).setFontAlign(0,0);
  g.drawString(value?"ON":"OFF", g.getWidth()/2, g.getHeight()/2);
  g.flip();
  NRF.setAdvertising({ 0x2A56 : [value]});
}

update();
setWatch(function() {
  value = !value;
  update();
}, BTN, {repeat:true});

When it's not connected to any other device it'll start advertising when running the code above, and pressing BTN1 will change what it advertises from a 0 to a 1 and back. You can then hook onto that with a rule in Home Assistant :)