Bug: Only Temperature is not being retrieved from Switchbot Meter.
### Describe The Bug

Only Temperature is not being retrieved from Switchbot Meter.

### To Reproduce

At the Homebridge UI accessory view, You can see that the temperature is displayed as 0.1 C. If you wait a few seconds, the correct number will be displayed, but if you refresh the browser, it will display 0.1 C again.

### Expected behavior

At the Homebridge UI accessory view, the temperature is displayed as 0.1 C. If you wait a few seconds, the correct number will be displayed, but if you refresh the browser, it will display 0.1 C again.

### Relevant log output

```shell
[11/14/2021, 4:04:16 AM] [@switchbot/homebridge-switchbot] This plugin generated a warning from the characteristic 'Current Temperature': characteristic value expected valid finite number and received "undefined" (undefined). See https://git.io/JtMGR for more info.
[11/14/2021, 4:04:16 AM] [@switchbot/homebridge-switchbot] Error: 
    at CurrentTemperature.Characteristic.characteristicWarning (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:2074:105)
    at CurrentTemperature.Characteristic.validateUserInput (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1967:16)
    at CurrentTemperature.<anonymous> (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1492:24)
    at step (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:143:27)
    at Object.next (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:124:57)
    at fulfilled (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:114:62)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
[11/14/2021, 4:04:16 AM] [@switchbot/homebridge-switchbot] This plugin generated a warning from the characteristic 'Current Temperature': characteristic value expected valid finite number and received "undefined" (undefined). See https://git.io/JtMGR for more info.
```


### Config for homebridge-switchbot

```shell
{
    "bridge": {
        "name": "Homebridge 7312",
        "username": "SECRET",
        "port": SECRET,
        "pin": "SECRET"
    },
    "accessories": [],
    "platforms": [
        {
            "name": "Config",
            "port": 8581,
            "platform": "config"
        },
        {
            "name": "SwitchBot",
            "credentials": {
                "openToken": "SECRET",
                "notice": "Keep your token a secret!"
            },
            "platform": "SwitchBot",
            "_bridge": {
                "username": "SECRET",
                "port": 46530
            }
        }
    ]
}
```


### Screenshots

![image](https://user-images.githubusercontent.com/63475228/141656255-e1d49244-457a-4920-b04a-c6d55e559504.png)

### Device & Model

SWITCHBOT-METERTH-S1

### Node.js Version

v16.13.0

### NPM Version

v8.1.0

### Homebridge Version

v1.3.6

### Homebridge Switchbot Plugin Version

v1.0.0

### Homebridge Config UI X Plugin Version

_No response_

### Operating System

Docker