Hi,
I have the same volume problem with my 2020 webOS LGTV.
I am using the LG webOS Binding version 2.5.7
The TV was paired successfully and I can control the volume from openhab.
However, when the volume is changed, we get an error.
as you can see the volume is reported correctly, but the “payload=null” causing problem.
2020-11-08 19:42:39.470 [WARN ] [bos.internal.handler.LGWebOSTVSocket] - Error while processing message: {"type":"response","id":2,"payload":{"volumeStatus":{"activeStatus":true,"adjustVolume":true,"maxVolume":100,"muteStatus":false,"volume":11,"soundOutput":"tv_speaker","cause":"volumeUp"},"returnValue":true,"callerId":"com.webos.platformstarfish"}} - in response to request: ServiceCommand [type=subscribe, target=ssap://audio/getVolume, payload=null] - Error Message: null
2020-11-08 19:42:39.790 [WARN ] [bos.internal.handler.LGWebOSTVSocket] - Error while processing message: {"type":"response","id":2,"payload":{"volumeStatus":{"activeStatus":true,"adjustVolume":true,"maxVolume":100,"muteStatus":false,"volume":12,"soundOutput":"tv_speaker","cause":"volumeUp"},"returnValue":true,"callerId":"com.webos.platformstarfish"}} - in response to request: ServiceCommand [type=subscribe, target=ssap://audio/getVolume, payload=null] - Error Message: null
2020-11-08 19:42:40.090 [WARN ] [bos.internal.handler.LGWebOSTVSocket] - Error while processing message: {"type":"response","id":2,"payload":{"volumeStatus":{"activeStatus":true,"adjustVolume":true,"maxVolume":100,"muteStatus":false,"volume":13,"soundOutput":"tv_speaker","cause":"volumeUp"},"returnValue":true,"callerId":"com.webos.platformstarfish"}} - in response to request: ServiceCommand [type=subscribe, target=ssap://audio/getVolume, payload=null] - Error Message: null