Sync failed! Error: Call to device timed out
网关型号： `acpartner.v2`
空调：格力，已经在米家app选择预设2

米家app所有操作都是正常的。

配置文件如下：
```
    {
      "accessories": [
        {
          "autoStart": "heat",
          "deviceIp": "192.168.10.56",
          "maxTemp": 30,
          "minTemp": 16,
          "name": "ac_zhu",
          "type": "climate"
        }
      ],
      "devices": {
        "192.168.10.56": "b64a013b69186b7ef12e4575be23c40c"
      },
      "platform": "XiaoMiAcPartner"
    },
```

空调伴侣操作无响应，日志如下：
```
[2018-7-1 04:29:03] [XiaoMiAcPartner] [INIT]Accessory ac_zhu -> type: climate
[2018-7-1 04:29:03] [XiaoMiAcPartner] [INIT]Register complete
[2018-7-1 04:29:03] [XiaoMiAcPartner] Initializing platform accessory 'ac_zhu'...
Load homebridge-mi-acpartner.XiaoMiAcPartner
[2018-7-1 04:29:03] [XiaoMiAcPartner] [INFO]Device 192.168.10.56 -> Connected
[2018-7-1 04:29:44] [XiaoMiAcPartner] [ac_zhu]Send code failed! Error: Call to device timed out
[2018-7-1 04:29:48] [XiaoMiAcPartner] [ac_zhu]Sync failed! Error: Call to device timed out
[2018-7-1 04:29:56] [XiaoMiAcPartner] [ac_zhu]Send code failed! Error: Call to device timed out
[2018-7-1 04:29:57] [XiaoMiAcPartner] [ac_zhu]Sync failed! Error: Call to device timed out
[2018-7-1 04:30:09] [XiaoMiAcPartner] [ac_zhu]Send code failed! Error: Call to device timed out
[2018-7-1 04:30:09] [XiaoMiAcPartner] [ac_zhu]Sync failed! Error: Call to device timed out
[2018-7-1 04:30:21] [XiaoMiAcPartner] [ac_zhu]Sync failed! Error: Call to device timed out
[2018-7-1 04:30:53] [XiaoMiAcPartner] [ac_zhu]Sync failed! Error: Call to device timed out
```
