[BUG]Homebridge 1.3.x warning from the characteristic 'Active Identifier': characteristic was supplied illegal value
@nicoduj I hope you are well.

With latest public Homebridge v1.3.0 I have this error/message in the log.
Plugin seems to work but to as reliable and correct for some reason. 
I have to investigate more and I'm sure other user can also contribute with some of their similar issues.

Thanks for your work. 

**Describe the bug**
[20.2.2021, 13:41:42] [homebridge-harmony] This plugin generated a warning from the characteristic 'Active Identifier': characteristic was supplied illegal value: number -1 exceeded minimum of 0. See https://git.io/JtMGR for more info.
[20.2.2021, 13:41:52] [homebridge-harmony] This plugin generated a warning from the characteristic 'Active Identifier': characteristic was supplied illegal value: number -1 exceeded minimum of 0. See https://git.io/JtMGR for more info.
