I’m going to give this solution a shot , especially because I’m trying to control a fireplace using the 303Mhz frequency and the RM4 Pro is only 433Mhz. It also has the custom MQTT for it to show up in HA with the correct state without any helpers and allows you to choose multiple fan speeds granted I just need on and off and I already have a C1101 module to try and set it up. Pretty sure they are using rolling codes which makes it more fun but still doable. Direct link to the GitHub project