Keyestudio 4DOF Manual page 205

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You can download the APP from the link:
https://drive.google.com/open?id=10U7EWyCyb5bGUxWm3DXRXGKEm1UQGU4Q
There are 10 control keys on the App. When connect well the HC-06 Bluetooth module to Android phone using our
APP, press the control key, Android phone will receive a corresponding value.
When programming, you can set the function for the corresponding value. So in the experiment, we will test each
key to get the corresponding value.
Pay close attention to:
1) First should pair Bluetooth in the phone settings. Connect the Bluetooth to
shield, powered up, LED on the Bluetooth module flashes, then open the mobile
Bluetooth, search for a Bluetooth device.
If find a new address, pair and enter 1234, paired successfully, you should see the
address name change to HC-06.
2) Must first upload the test program successfully, then connect the Bluetooth, pair
and connect the App. Otherwise, fail to upload the program.