Hi guys of which I been using for some time, but now can pair the Bluetooth with my phone connect to same app I have been using the Bluetooth with but there no communication between the app and Arduino.
That only means what it says, and no guarantee that Bluetooth is properly connected to Arduino. Rx< Tx and Tx> Rx. You can verify a kosher connection by sending AT command, but careful perusal of the obvious usually suffices.
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