This page shall list all rocnet node mqtt setups which act as rocnet node and enable lot connect actors, sensors or locos. Typically ESP8266 based.
ESPWIFIROCNET
ESP8266 code using MQTT to communicate with RocRail as a node. This program is designed to work with Rocrail, as a Rocnode.
I recommend you also review https://wiki.rocrail.net/doku.php?id=rocnet:rocnet-prot-en#groups