Guide: Install LYWSD03MMC in macOS 
I had problems receiving bluetooth data from the LYWSD03MMC on a MacBook with macOS Big Sur and Homebridge being installed. So I wanted to share my experience here

1. Install [Xcode](https://apps.apple.com/us/app/xcode/id497799835?mt=12)
2. install the [homebridge-mi-hygrothermograph plugin](https://www.npmjs.com/package/homebridge-mi-hygrothermograph). When using the [Homekit UI plugin](https://www.npmjs.com/package/homebridge-config-ui-x) noble will automatically be installed
3. Here comes the important part: In macOS got to Preferences -> Security & Privacy -> Bluetooth and allow "node" bluetooth access. In my case node was located in usr/local/include/
<img width="780" alt="Screen Shot 2020-12-27 at 2 48 19 PM" src="https://user-images.githubusercontent.com/5749697/103178723-78235900-4853-11eb-9101-083209e36bac.png">
4. Reboot Homebridge and you should receive data from the hygrothermograph from now on (check Homebridge logs  with debug mode enabled)

The above steps were required to get the plugin up and running in Big Sur. 

Catalina does not have any Bluetooth settings in  "Security & Privacy". However, to make the plugin receive data in Catalina I needed to reset my bluetooth settings (Press Option+Shift and clíck on Bluettoth Icon in the  menu bar -> Select "Debug" in drop-down menu ->  "Reset Bluetooth"
