1. Install Blueapp serial port and APP（ http://pan.baidu.com/s/1dEYlIqX ）,
2. Set up the serial port app, open the app, switch to the on/off option, and a menu will pop up in the Changan gray box for setting. Select hexadecimal, open the command A001 01 A2, and close the command A001 00 A1. Be sure not to have too many spaces and ensure consistent format.
3. Power on the relay module and click on the connection in the app to search. The first pairing will take longer, so search a few more times (you can also use your phone's built-in to search for pairing). After pairing, you can use the APP to control the module.
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