All TPLink Kasa Devices showing offline when accessing apple "Home" from WAN


### Expected Behavior
TPLINK devices should respond in the apple "Home" app like they do in the Kasa app when not on the LAN network.  All other Homebrige Plugins show accessories and function when on WAN.  When on VPN all TP link Accessories show working. 


### Current Behavior
All TPlink devices show now responding when checking the Apple Home App and the iPhone is not on the same network such as when on cellular or other WAN network.

### Steps to Reproduce (for bugs)
Provision TPlink Device 
Instal home bridge
pair home bridge with apple Homekit
test on WAN.
Turn off wifi on mobile device (EX: iPhone)
Open Apple Home App
TPLink devices show offline and not responding to commands.
Note other home bridge plugin still working and responding with their accessories (EX: Wemo)


### Versions


Node.js Version | v14.17.2
NPM | v6.14.13
Homebridge | 1.3.4
Ubuntu | 20.04LTS (no container)
homebridge-tplink-smarthome | v6.4.0

### Configuration
<!-- Please include the TplinkSmarthome platform section of your config.json file.
Paste between the the two ``` lines below.
-->
```json
        {
            "name": "kasa_TPlink",
            "platform": "TplinkSmarthome"
        }
```

### Homebridge Log / Command Output

```

```
