Long time Yatse user here. With my new Onkyo AVR I have some problems with CEC, namely loosing remote on input change.
If I send the Activate CEC command from Yatse shutdown menu, CEC is back and fully functional.
Can you please tell me what command is exactly sent to Kodi and in which way? I would like to use the same command mapped to my remote.
This is best questions for Kodi forums 
CECActivateSource()
https://kodi.wiki/view/List_of_built-in_functions
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Thanks! Yes, I started on Kodi/Coreelec forums, but the only command that works is yours in Yatse.
So the above simply sends the built in CECActivateSource()