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Bluetooth Programming with Python

Avinesh

I have successfully connected my cell phone to the Raspberry Pi's onboard Bluetooth. I know the Bluetooth works, but I cannot get connection on Bluetooth to work properly.

I get this error when I run the script:

 

Traceback (most recent call last):

  File "/home/pi/Desktop/bluetest.py", line 34, in <module>

    s.connect((serverMACAddress, port))

  File "<string>", line 5, in connect

BluetoothError: (111, 'Connection refused')

 

How do I fix this, or what do I need to do to make this work?

 

 

import bluetooth

from bluetooth import *

 

serverMACAddress = '00:13:EF:C0:02:1E'

port = 3

s = bluetooth.BluetoothSocket(bluetooth.RFCOMM)

s.connect((serverMACAddress, port))

while 1:

     text = raw_input() # Note change to the old (Python 2) raw_input

     if text == "quit":

         break

     s.send(text)

sock.close()

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  • Hi Avinesh,

    The error you report in your post it is telling that the bluetooth server is refusing the connection. Assuming the MAC address of the server is OK, the problem could be due to using the wrong port number.

    You can check what services (and on which ports) are available on the server by using the find_service(address='00:13:EF:C0:02:1E') API, which should return the list of the services, something like:

     

     

    [{'description': None,
          'host': '00:13:EF:C0:02:1E',
          'name': <some_name>,
          'port': <port_number>,
          ...},
    {'description': None,
      'host': '00:13:EF:C0:02:1E',
          'name': <some_other_name>,
          'port': <another_port_number>,
          ...}]

     

    Find the right service you need, and check the port number matches the one you used in your code.

    Fabio.

     

    P.S: To check if the MAC address is OK, you can use the discover_devices() API, which returns the list of MAC addresses for the devices you can connect to.

  • in reply to gecoz
    the list of MAC addresses for the devices you can connect to

    ... as well as the devices names (after few seconds after the immediate discovery process) in human readable format. Don't forget to be sure that the target device is discoverable. Many peripherals set their discoverability for few seconds (less than a minute) only to reduce power consumption.

     

    Enrico

     

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  • in reply to gecoz
    the list of MAC addresses for the devices you can connect to

    ... as well as the devices names (after few seconds after the immediate discovery process) in human readable format. Don't forget to be sure that the target device is discoverable. Many peripherals set their discoverability for few seconds (less than a minute) only to reduce power consumption.

     

    Enrico

     

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