addAdd the module as software serial then add these lines to setup() these line tell us the bluetoothBluetooth to turn into data mode
bluetooth.begin(115200); bluetooth.print("$$$"); delay(100); bluetooth.println("U,9600,N"); bluetooth.begin(9600);:
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bluetooth.begin(115200); bluetooth.print("$$$"); delay(100); bluetooth.println("U,9600,N"); bluetooth.begin(9600);