The probe if online seems too slow for Siri
If I use Siri with HomePod to turn on the TV the response seems too slow for Siri to recognize. It says, that "some devices are not responding". After a few more seconds the "turning wheel" in HomeKit is gone and the Switch shows that the TV is turned on. 
Maybe the check for the availability of port 3000 is too slow?

>         {
>             "accessory": "webostv",
>             "name": "LG-TV",
>             "ip": "<ip>",
>             "mac": "<mac>,
>             "keyFile": "./lgtvKeyFile",
>             "pollingEnabled": true,
>             "volumeControl": false,
>             "channelControl": false
>         }