Wrong Status
Hello,

I really love the add-on, thanks for great work. 
However, after the latest update Home app shows the wrong status for the TV. When I click the switch it can turn the tv off, change switch to off position after 5 seconds switch goes on again while tv stays of. Here is the config 
`        {
            "accessory": "webos3",
            "name": "LG Television",
            "ip": "192.168.1.24",
            "mac": "ab:ab:ab:ab:ab:ab",
            "keyFile": "/home/pi/.homebridge/lgtvKeyFile",
            "pollingEnabled": true,
            "volumeControl": false,
            "pollingInterval": 10,
            "appSwitch": [
                "com.webos.app.hdmi4"
            ]
        }` 

And here is the log:
`[4/4/2018, 9:46:40 PM] [LG Television] webOS - connected to TV
[4/4/2018, 9:46:58 PM] [LG Television] webOS - disconnected from TV
[4/4/2018, 9:49:04 PM] [LG Television] webOS - connected to TV
[4/4/2018, 9:49:04 PM] [LG Television] webOS - current appId: com.webos.app.hdmi4
**[4/4/2018, 9:49:08 PM] [LG Television] webOS - disconnected from TV**
[4/4/2018, 9:49:24 PM] [LG Television] webOS - connected to TV`

The bold part is the where I turn tv off, and in the logs it says "connected to TV" but tv is off actually. I'm pretty sure that Mac address is correct and ip is binded to it.

Thanks