@harrys, I just created an addon to allow control of X10 via CM11. This should allow you to convert to Home Assistant OS without losing X10 connectivity
It uses MQTT to control the X10 devices, using Heyu under the covers, so all you’d need to do is convert your old X10 entries over to MQTT entries. It also updates state in HA correctly when using X10 remotes. Note only ON and OFF are supported, no dimmers (the old HA X10 didn’t really support them either from what I found).
I wrote this for a friend of mine who also still has some old X10 devices in use and who wants to convert from the ‘venv’ style (hard for him to support with lack of Linux knowledge) to Home Assistant OS.
I’d also be willing to package ‘mochad’ into a addon if there is still interest.
Here’s the forum post with details: