hi,
here is the item:
String myKodi_playfavorite "Play favorite" { channel="kodi:kodi:8f67bed9-afbb-92b8-5cad-c6cb49e53ecb:playfavorite" }
here is the trace log from the moment item is enabled
2020-08-02 21:42:32.330 [INFO ] [el.core.internal.ModelRepositoryImpl] - Refreshing model 'kodi.items'
==> /var/log/openhab2/events.log <==
2020-08-02 21:42:32.391 [.ItemChannelLinkAddedEvent] - Link 'myKodi_playfavorite-kodi:kodi:8f67bed9-afbb-92b8-5cad-c6cb49e53ecb:playfavorite' has been added.
2020-08-02 21:42:32.393 [vent.ItemStateChangedEvent] - myKodi_playfavorite changed from NULL to UNDEF
==> /var/log/openhab2/openhab.log <==
2020-08-02 21:42:36.567 [TRACE] [i.internal.protocol.KodiClientSocket] - send message: {"jsonrpc":"2.0","id":39132,"method":"Player.GetActivePlayers"}
2020-08-02 21:42:36.572 [TRACE] [i.internal.protocol.KodiClientSocket] - Message received from server: {"id":39132,"jsonrpc":"2.0","result":[{"playerid":0,"playertype":"internal","type":"audio"}]}
2020-08-02 21:42:36.576 [DEBUG] [i.internal.protocol.KodiClientSocket] - callMethod returns: {"id":39132,"jsonrpc":"2.0","result":[{"playerid":0,"playertype":"internal","type":"audio"}]}
2020-08-02 21:42:36.580 [TRACE] [i.internal.protocol.KodiClientSocket] - send message: {"jsonrpc":"2.0","id":39133,"method":"Application.GetProperties","params":{"properties":["version"]}}
2020-08-02 21:42:36.585 [TRACE] [i.internal.protocol.KodiClientSocket] - Message received from server: {"id":39133,"jsonrpc":"2.0","result":{"version":{"major":18,"minor":7,"revision":"18.7.1-Leia","tag":"stable"}}}
2020-08-02 21:42:36.589 [DEBUG] [i.internal.protocol.KodiClientSocket] - callMethod returns: {"id":39133,"jsonrpc":"2.0","result":{"version":{"major":18,"minor":7,"revision":"18.7.1-Leia","tag":"stable"}}}
2020-08-02 21:42:36.592 [TRACE] [i.internal.protocol.KodiClientSocket] - send message: {"jsonrpc":"2.0","id":39134,"method":"Player.GetProperties","params":{"playerid":0,"properties":["speed"]}}
2020-08-02 21:42:36.597 [TRACE] [i.internal.protocol.KodiClientSocket] - Message received from server: {"id":39134,"jsonrpc":"2.0","result":{"speed":1}}
2020-08-02 21:42:36.601 [DEBUG] [i.internal.protocol.KodiClientSocket] - callMethod returns: {"id":39134,"jsonrpc":"2.0","result":{"speed":1}}
2020-08-02 21:42:36.615 [TRACE] [i.internal.protocol.KodiClientSocket] - send message: {"jsonrpc":"2.0","id":39135,"method":"Player.GetProperties","params":{"playerid":0,"properties":["subtitleenabled","currentsubtitle","currentaudiostream","currentvideostream","percentage","time","totaltime","audiostreams","subtitles"]}}
2020-08-02 21:42:36.622 [TRACE] [i.internal.protocol.KodiClientSocket] - Message received from server: {"id":39135,"jsonrpc":"2.0","result":{"audiostreams":[],"currentaudiostream":{},"currentsubtitle":null,"currentvideostream":null,"percentage":0.0,"subtitleenabled":false,"subtitles":[],"time":{"hours":0,"milliseconds":32,"minutes":25,"seconds":40},"totaltime":{"hours":0,"milliseconds":0,"minutes":0,"seconds":0}}}
2020-08-02 21:42:36.627 [DEBUG] [i.internal.protocol.KodiClientSocket] - callMethod returns: {"id":39135,"jsonrpc":"2.0","result":{"audiostreams":[],"currentaudiostream":{},"currentsubtitle":null,"currentvideostream":null,"percentage":0.0,"subtitleenabled":false,"subtitles":[],"time":{"hours":0,"milliseconds":32,"minutes":25,"seconds":40},"totaltime":{"hours":0,"milliseconds":0,"minutes":0,"seconds":0}}}
2020-08-02 21:42:36.677 [TRACE] [i.internal.protocol.KodiClientSocket] - send message: {"jsonrpc":"2.0","id":39136,"method":"Player.GetItem","params":{"playerid":0,"properties":["uniqueid","title","originaltitle","album","artist","track","director","thumbnail","fanart","file","showtitle","season","episode","channel","channeltype","genre","mpaa","rating","votes","userrating"]}}