DUALR3 Motor Mode
### What issue do you have? Please be as thorough and explicit as possible.

In the eWeLink App, I have added my new device (Sonoff Dual R3) and configure it as a motor. I have also calibrate motor directly inside the app. My awning open and close well with eWeLink app.
Then, this device is detected by the plugin as we can see on following log: 

> 27/04/2021, 16:55:33] [eWeLink] LAN monitoring started.
[27/04/2021, 16:55:34] [eWeLink] [Awning] initialised and found locally with IP [192.168.1.73].
[27/04/2021, 16:55:34] [eWeLink] [Terrace Light] initialised and found locally with IP [192.168.1.65].

Then, in Home App, I can see the device but when I would like to act on it, nothing happens.
I have tried to configure this device as a multipledevice as mentionned in your configuration settings but nothing still happens.

### Details of your setup.
* Do you use (1) Homebridge (+ config-ui), (2) Homebridge (CLI) or (3) HOOBS?

(1) Homebridge (+ config-ui)


* Which version of Homebridge/HOOBS do you have?

v1.3.4

* Which platform do you run Homebridge/HOOBS on (e.g. Raspberry Pi/Windows/HOOBS Box)? Please also mention your version of Node.js/NPM if known.

Raspberry Pi 4 Node.js v14.16.1 Npm v7.8.0

* Which version of this plugin (homebridge-ewelink) do you have? Has the issue started since upgrading from a previous version?

v6.2.2. I do not know if it works with an old version, I do not tried it

* Which eWeLink devices do you have that are causing issues? Please include product models if applicable.

DUALR3 
