Jan,?
I don't necessary agree with you on that. MQTT can certainly send data to an engine and drive it via an Arduino or whatever. You can also use it to send strings to an arduino that controls a DCC decoder. The problem is the readability of the data being transferred and how fast it gets there. So it could some what replace how commands get sent to the engine, but Decoders have very nice sound control, which is hard to replicate.?
Chris?
