From the Spanish telegram community of Duet we are making an integration with Nodered, to have bot, timelapse, dashboard for various duet machines ...
soon we will have an image for raspberry to release preconfigured, with which anyone can continue to customize 
mqtt bridge include in this option, read data from duet api, use in flow and inject to mqtt server, o in the include server in the pi
Leds control is macro call in the duet board, and the macro set the pwm in pin in expansion port, and read with small arduino or wemos, and change the effect.
is possible set effect for heating, error, printing, homing, finish etc...