Bug: Curtains failing to open/close via BLE
### Describe The Bug

Curtains report status correctly, but do not open or close when operated through home app. Perhaps Bluetooth does not initialise quickly enough before the request is sent?

### To Reproduce

Attempt to open/close curtains through Home app

### Expected behavior

Curtains to open/close

### Relevant log output

```shell
[26/12/2021, 15:18:05] [SwitchBot] Curtain: Curtain Right Checking Status ...
[26/12/2021, 15:18:05] [SwitchBot] Curtain: Curtain Left Checking Status ...
[26/12/2021, 15:18:07] [SwitchBot] Curtain Right Target Position: 0
[26/12/2021, 15:18:07] [SwitchBot] Curtain: Curtain Right failed pushChanges with BLE Connection
[26/12/2021, 15:18:47] [SwitchBot] Curtain Right Target Position: 0
[26/12/2021, 15:18:48] [SwitchBot] Curtain: Curtain Right failed pushChanges with BLE Connection
[26/12/2021, 15:18:52] [SwitchBot] Curtain Left Target Position: 0
[26/12/2021, 15:18:52] [SwitchBot] Curtain: Curtain Left failed pushChanges with BLE Connection
```


### Config for homebridge-switchbot

```shell
"name": "SwitchBot",
            "credentials": {
                "notice": "Keep your token a secret!"
            },
            "options": {
                "devices": [
                    {
                        "deviceId": "C96A0B3F840C",
                        "configDeviceName": "Curtain Right",
                        "configDeviceType": "Curtain",
                        "ble": true,
                        "curtain": {
                            "set_minStep": 10
                        }
                    },
                    {
                        "deviceId": "D0FB469E79F0",
                        "configDeviceName": "Curtain Left",
                        "configDeviceType": "Curtain",
                        "ble": true,
                        "curtain": {
                            "set_minStep": 10
                        }
                    }
                ]
            }
```


### Screenshots

_No response_

### Device & Model

Raspberry Pi 4 Model B

### Node.js Version

v16.13.1

### NPM Version

v8.1.2

### Homebridge Version

v1.3.8

### Homebridge Switchbot Plugin Version

v1.4.0

### Homebridge Config UI X Plugin Version

_No response_

### Operating System

Raspian