HS200 Is Not Discovered
The HS200 I have does not seem to want to be discovered on my network. The HS200 sits on a separate IOT VLAN than the Homebridge server but the firewall has Avahi installed that should allow it to pass through.

### Expected Behavior
The device should be showing up in the accessory list.

### Current Behavior
The HS200 I have on a separate VLAN does not seem to be discoverable even with the host hardcoded in the file. 

### Steps to Reproduce (for bugs)
N/A

### Versions
Node: homebridge@raspberrypi:/var/lib/homebridge $ node --version
v12.18.3

Homebridge: homebridge@raspberrypi:/var/lib/homebridge $ homebridge --version
1.2.3

OS: Raspbian

### Configuration

"name": "TplinkSmarthome",
            "addCustomCharacteristics": false,
            "platform": "TplinkSmarthome",
            "devices": [
                {
                    "host": "192.168.12.200"
                }

### Homebridge Log / Command Output

```
[10/3/2020, 2:07:30 PM] [TplinkSmarthome] Initializing TplinkSmarthome platform...
[10/3/2020, 2:07:30 PM] [TplinkSmarthome] homebridge-tplink-smarthome v5.1.0, node v12.18.3, homebridge v1.2.3

API Search Command:
homebridge@raspberrypi:/var/lib/homebridge $ tplink-smarthome-api search
Searching...
startDiscovery({
  discoveryInterval: 2000,
  discoveryTimeout: 10000,
  breakoutChildren: true
})
homebridge@raspberrypi:/var/lib/homebridge $ 
```
