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I have paired two android phones to the Raspberry Pi 3. However when I attempt to execute a file it gives me the error:

[Errno 2] could not open port /dev/rfcomm0: [Errno 2] No such file or directory: '/dev/rfcomm0'

I have tried testing the connection using the Bluetooth Terminal from Play Store. It says that the device is unavailable.

Does anyone know how to fix this problem?

2

You have to perform several steps in order to establish communication.

  1. You have to pair your desired bluetooth device using bluetoothctl

    sudo bluetoothctl -a

    scan on
    devices
    pair XX:XX:XX:XX:XX:XX
    trust XX:XX:XX:XX:XX:XX
    quit
    

    Where XX:XX:XX:XX:XX:XX is the MAC address of your bluetooth device.

  2. You have to create the serial device that binds to your paired bluetooth device.

    sudo rfcomm bind /dev/rfcomm0 XX:XX:XX:XX:XX:XX 1
    

    The last number is the communication channel. It has to bee unique for all your connections.

Then you should be able to open a connection. (Assuming your bluetooth device actually supports the required SPP protocol.)

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