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I want to connect my raspberry pi 3 b+ to a smartphone via bluetooth connection. By this connection, I want to receive command from the smartphone to start running codes on my raspberry pi. Can you please tell me how to pair these two devices and receive commands over bluetooth.

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    Well, you have two questions: (1) how to connect smartphone to BT serial module, [2] How to connect Rpi3B+ to the same BT module. And after both connections are made, you talk to your phone over text messages, Rpi will say your text to BT, BT to phone. The first question is easy, and not related to Rpi. For the second question, the following post might be helpful: raspberrypi.stackexchange.com/questions/98177/… – tlfong01 May 21 at 1:59

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