I have a few SOnOff S20 devices running in my HA system without issue. I have them configured though ESPHome and they work fine (indoors only) without communicating with any non-LAN system. I have flashed these devices by connecting the appropriate cable to the internal ports and have updated them wirelessly.
I also have a few SOnOff S26 devices and was wondering if I can add these to my HA system. They do not have readily accessible internal ports and I have not found anything that shows how to flash them wirelessly. Like my current devices, I do not want them to have to communicate with any non-LAN system to function.
Can you point me to some instructions for setting these up? Thanks.