Australian power strip KP303 appears to work properly
### Expected Behaviour
KP303 Australian power strip should work, switching all 3 outlets.

### Current Behaviour
KP303 Australian power strip does work, switching all 3 outlets!

### Versions
<!-- Please run commands and include versions below. -->
- **Node**:       `v10.16.3`
- **Homebridge**: `0.4.50`
- **OS**:         oznu/homebridge (https://hub.docker.com/r/oznu/homebridge/)

### Configuration
```json
{                                                                               
    "bridge": {                                                                 
        "name": "Homebridge",                                                   
        "username": "xxxx",                                        
        "port": 52650,                                                          
        "pin": "xxxx"                                                     
    },                                                                          
    "accessories": [],                                                          
    "platforms": [{                                                             
        "platform": "TplinkSmarthome",                                          
        "name": "TplinkSmarthome",                                              
                                                                                
        "broadcast": "255.255.255.255",                                         
        "devices": [],                                                          
        "deviceTypes": [],                                                      
        "macAddresses": [],                                                     
        "excludeMacAddresses": [],                                              
        "pollingInterval": 10,                                                  
                                                                                
        "addCustomCharacteristics": true,                                       
        "inUseThreshold": 0,                                                    
        "switchModels": ["HS200", "HS210"],                                     
        "timeout": 15                                                           
    }]                                                                          
}
```

### Homebridge Log / Command Output
```
[11/3/2019, 6:46:56 AM] [TplinkSmarthome] New Device Online: [Plug 1] plug [xxxx] 192.168.1.35 9999                       
[11/3/2019, 6:46:56 AM] [TplinkSmarthome] Adding: [Plug 1] plug [xxxx]                                                    
[11/3/2019, 6:46:56 AM] [TplinkSmarthome] New Device Online: [Plug 2] plug [xxxx] 192.168.1.35 9999                       
[11/3/2019, 6:46:56 AM] [TplinkSmarthome] Adding: [Plug 2] plug [xxxx]                                                    
[11/3/2019, 6:46:56 AM] [TplinkSmarthome] New Device Online: [Plug 3] plug [xxxx] 192.168.1.35 9999                       
[11/3/2019, 6:46:56 AM] [TplinkSmarthome] Adding: [Plug 3] plug [xxxx]                                                    
HAP Warning: Characteristic 00000053-0000-1000-8000-0026BB765291 not in required
 or optional characteristics for service 0000003E-0000-1000-8000-0026BB765291. A
dding anyway.
```
