Outdoor Plug mss620
Hello!

In setting up this plugin today I was able to connect my garage door very easily, however I ran into an issue with my outdoor plug mss620. Specifically, the HomeBridge error is: 
```
TypeError: Cannot read property 'onoff' of undefined
    at Meross.getOnCharacteristicHandler (/usr/local/lib/node_modules/homebridge-meross/src/index.ts:513:87)
    at processTicksAndRejections (node:internal/process/task_queues:93:5)
```
### Config
```
"bridge": {
        "name": "Homebridge ****",
        "username": "**:**:**:**:**:**",
        "port": 51346,
        "pin": "***-**-***"
    },
    "accessories": [
        {
            "model": "MSG100",
            "name": "Garage Door",
            "deviceUrl": "192.168.1.254",
            "channel": 0,
            "messageId": "*******************************",
            "timestamp": *********,
            "sign": "********************************************",
            "garageDoorOpeningTime": 15,
            "accessory": "Meross"
        },
        {
            "model": "MSS620",
            "name": "Inflatable",
            "deviceUrl": "192.168.1.253",
            "channel": 1,
            "messageId": "*******************************",
            "timestamp": *******************************,
            "sign": "*******************************",
            "accessory": "Meross"
        },
        {
            "model": "MSS620",
            "name": "Christmas Lights",
            "deviceUrl": "192.168.1.254",
            "channel": 2,
            "messageId": "*******************************",
            "timestamp": *******************************,
            "sign": "*******************************",
            "accessory": "Meross"
        }
    ],
    "platforms": [
        {
            "name": "Config",
            "port": 8581,
            "auth": "form",
            "theme": "auto",
            "tempUnits": "f",
            "lang": "auto",
            "platform": "config"
        }
    ]
}
```

Any idea where I should start looking?

Thanks in advance!