Yes, now we could start working on details. I also want to support the color picker (item type color) etc., but as @hmerkmentioned “Please keep in mind that the binding is in alpha state” Looking forward to more suggestions.
I just started yesterday: https://github.com/markus7017/org.openhab.binding.shelly/blob/alpha5/README.md
Please send a TRACE Log as PM. So far I didn’t tried the timers. Nevertheless I would expect that the relay supports the ison property, which indicates the switch state.
Please feel free to open an issue here: https://github.com/markus7017/org.openhab.binding.shelly/issues or send me a PM.
Please make sure to include the thing type, e.g. Shelly1, Shelly 2.5 relay mode, Shelly Plug-S etc.