This worked like a blast!
I am just testing my thermal printer which is connected via bluetooth,
It just simply worked and I got a print of what I wrote!

Many many thanks man!
Keep posting such articles..

It could be that the serial port hasn’t appeared properly for some reason. What do you get when you run

ls -alh /dev/rfcomm1

and

lsusb

Regards

Alan

Do you have any thoughts?

That error is sometimes caused if you have another program using the serial port, have you got another program such as cutecom running?

If that’s not the problem then I’d actually recommend using a separate serial program like cutecom to test that the serial port works, before you try to use it with Python.

On the Raspberry Pi you can install cutecom with

sudo apt-get install cutecom

When you run cutecom (needs to be run from the desktop) you type the name of your serial port in, select the baud rate and then open the connection. At that point you should should be able to send a message with 2 numbers to the Arduino.

Best of luck.

Regards

Alan

Traceback (most recent call last):
File “bluetooth_serial_example.py” , line 21, in
buetoothSerial.write( “{0} {1}”.format(a,b ))
file “/usr/lib/python2.7/dist-packages/serial/serialposix.py”, line 485, inwrite
raise SerialException(‘write failed: %s’ % (v,))
serial.serialutil.SerialException: write failed: [Errno 5] Input/output error

…. what i shoud do…. help me…

Sorry I can’t be more help, but it’s tough without having the specific devices to hand.

Regards

Alan

My bluetooth module is this one https://www.adafruit.com/products/1588 and my bluetooth dongle is this one https://www.adafruit.com/product/1327. I am able to pair my bluetooth module with my laptop so i guess it work properly

After few test, i finally manage to pair my raspberry to my bluetooth module using the command “sudo bluez-simple-agent hci# xx:xx:xx:xx:xx:xx” but we did not ask me any password ( yet i have to use one to pait it with my laptop ) and when i’ve tried to run a test code, there is an error :

Traceback (most recent call last):
File "test.py", line 6, in
bluetoothSerial.write("test")
File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 485, in write
raise SerialException('write failed: %s' % (v,))
serial.serialutil.SerialException: write failed: [Errno 107] Transport endpoint is not connected

And here is the test code that i use :

#! /usr/bin/python

bluetoothSerial = serial.Serial( "/dev/rfcomm1", baudrate=9600 )
time.sleep(5)
bluetoothSerial.write( "test")

Thanks

I’m not sure I’m afraid. I haven’t seen that particular error before and I haven’t had to try the KeyboardDisplay to DisplayYesNo change. Which 2 bluetooth devices are you trying to pair exactly? I.e. which dongle, and can you post a link to the Adafruit device? Also, are you able to pair a bluetooth enabled smartphone to the target bluetooth device? It’s usually easier to pair phones with devices and you can see if the passcode is as you expect etc.

Regards

Alan

I follow your guide to connect my Adafruit bluetooth module to my pi but i have cannot pair these two devices together. In fact, when i run this command “sudo bluez-simple-agent hci# xx:xx:xx:xx:xx:xx” ( with my module adresse and number of course ) i get an error “Creating device failed: org.bluez.Error.AuthenticationRejected: Authentication Rejected”

How can i solve that ? ( i already try to change the word ‘KeyboardDisplay’ with ‘DisplayYesNo’ of the file in the “/usr/bin/bluez-simple-agent” directory )

Practically anything is possible with computers and robotics, provided that you’ve got enough time. One way to do what you want would be to write a server program that ran on the Pi. Your virtual machine could then talk to this server program over the network, and send commands to the bluetooth device. You can write the server program in whichever language you’re most comfortable with, but personally I’d try to use Python and XML-RPC.

Regards

Alan