I think it has been resolved. On the ratgdo device web page, at the bottom - all the way at the bottom, there is a Control Protocol selection dropdown. I totally missed this (MY BAD – BIG TIME). I saw and focused on the firmware update at the top of the page. (tunnel vision) However, I selected Security +1, and then updated the ratgdo firmware to V2.1. The system was updated and rebooted. However, the garage door would not respond. So – reflashed, firmware reinstall complete, selected Security +1, DID NOT update the ratgdo firmware to V2.1 and ratgdo works. So, for me anyway, the firmware update is titled: ratgdo_esp8266_v2.1.bin. And the update description would seem to indicate I need to update as I am using Home Assistant. But I now believe the update label means the firmware update is for esphome, not mqtt. So, as of right now, ratgdo works as advertised. Hope this helps!