[Homie] signal when wifi disconnected

[CWempe]

Show color signal (1st LED) when specific events occur.
Like Wifi disconnected.

https://homieiot.github.io/homie-esp8266/docs/2.0.1-pre1/advanced-usage/events/

[CWempe]

You can also use homie.isConnected() in loop.
IIRC it is true when WiFi and MQTT are connected.
Or you can use your own loop handler which is only called when everything is connected.