Sending messages or datas with bluetooth via python

Question

How can i send messages over bluetooth via python without key authentification like type numbers ?

i used pybluez
but i got this error:

File "./send", line 12, in <module>
    connect()
File "./send", line 8, in connect
    sock.connect((bd_addr, port))
File "<string>", line 5, in connect
    bluetooth.btcommon.BluetoothError: (111, 'Connection refused')

Here is the code

#!/usr/bin/python

import bluetooth

def connect ():
    bd_addr = "x:x:x:x:x:x"
    port = 1
    sock=bluetooth.BluetoothSocket(bluetooth.RFCOMM)
    sock.connect((bd_addr, port))
    sock.send("hello!!")
    sock.close()

connect()

Asked By: bulleric

||

Source

Answer 1

Have you tried starting with the basic rfcomm-client and rfcomm-server example code from pybluez?

http://code.google.com/p/pybluez/source/browse/trunk/examples/simple/rfcomm-client.py

It’s basically what your code is doing, but it uses service discovery to ensure connection to proper port.

Answered By: TJD

Answer 2

I had the same error. After binding the address the error went away.

rfcomm bind 0 <address> 1

The 0 refers to your bluetooth device. The 1 refers to the port number.
If you’re running linux you can run hciconfig to the the device number.

Answered By: mingxiao

Answer 3

As @TJD said, you need to ensure you bind with the correct port for the service you want.

>>> from bluetooth import *
>>> from pprint import pprint
>>>
>>> devices = discover_devices()
>>> devices
['xx:yy:tt:zz:44:BD', '00:yy:72:zz:bb:aa']

Then as the second step try to find the service on the device you want to connect to.

>>> service = find_service(address='00:yy:72:zz:bb:aa')
>>> pprint(service)
[{'description': None,
  'host': '00:yy:72:zz:bb:aa',
  'name': 'Headset Audio Gateway',
  'port': 12,
  'profiles': [('1108', 258)],
  ...},
 {'description': None,
  'host': '00:yy:72:zz:bb:aa',
  'name': 'Dial-Up Networking',
  'port': 1,
  'profiles': [('1103', 256)],
  'protocol': 'RFCOMM',
  ...}]

Based on this information you can connect to a service running on a device. According to the service/profile specification you send service specific commands and get back information from the device. E.g. in the list above you see the ‘Headset Audio Gateway’ and the profile list with the number ‘1108’, which is the short uuid for the service. You can now lookup the commands for this profile and it should work.

Answered By: laidback

Answer 4

I tried running the same code in your question, its working for me, i can send some data and see that the data coming into arduino using its Serial Monitor.

But, I did one step prior to it, I paired the HC-05 first with my device (the one using which i am trying to send data, in my case, its a linux machine)

I used bluetoothctl tool to pair .

sudo bluetoothctl # this will start the tool in cli
scan on # this will show the MAC address of hc-05
pair <MAC_ADDRESS_OF_HC-05> #this will ask for username and password
for my module the password is 1234

working picture

Answered By: Vignesh Waran

Sending messages or datas with bluetooth via python

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