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Hello,
the four buttons are soft keys, which are used as input device for the HMI. I have used them to to control the heating, and to switch the audio amplifier. But this is very specific and you should modify the code to fulfill your needs.
Regarding Bluetooth you need a device as counterpart. The characteristics depend on the content you want to display or control.
Hey, what is the function of the four buttons, Bluetooth can not be configured, need to modify the parameters?
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