Obex permission denied

[ra.ravi.rav]

I was trying following code to create temporary files and send it between phones. I have avoided RFCOMM specifically for the purposes of my project.

http://pastebin.com/f34c4f676

I ask user to enter the text message. Save it in a temporary file and then send it to other phone using obex. I got the error

socket.error (13, 'Permission denied')

I have saved the temporary file in E:\\Images folder to avoid the clash with directory permissions. However I am using 2nd edition devices which do not require special capabilities.

[ra.ravi.rav]

I figured it out. I have to close the file before sending it. But this has given me another problem.

How do I use inbox to recieve files sent using OBEX. I can use bt_obex_recieve_file() but this is a blocking call and and whole application freezes. I want to keep the application alive while waiting for network messages. How do I do this?

[aya42]

I can use bt_obex_recieve_file() but this is a blocking call and and whole application freezes. I want to keep the application alive while waiting for network messages. How do I do this?

Depends if the bt_obex_recieve_file() will work with a socket which has been set non-blocking. If not, you'll have to run it blocking in another thread. If you choose the latter approach, make sure you create the socket in the same thread which calls bt_obex_recieve_file().

[ra.ravi.rav]

I learned a bit about Active objects. Requests to read and write are sent to Blutooth server. But there is a limitation of only one request at a time.

I create a new thread (say t1) and call it in the context of the main thread using ao_e32.callgate(). In that I wait for the incoming message. When I want to send a mesaage over bluetooth I should stop this thread, send the message and start the thread again. But now the problem is how do I stop a thread in Python.

P.S. thread module is available in Python for S60 and threding can be installed over it using threading.py from the PC version of Python

[aya42]

I create a new thread (say t1) and call it in the context of the main thread using ao_e32.callgate(). In that I wait for the incoming message. When I want to send a mesaage over bluetooth I should stop this thread, send the message and start the thread again. But now the problem is how do I stop a thread in Python.

Please post the code which you're having problems with.

[ra.ravi.rav]

Here is the code:

http://pastebin.com/f4a84e11c

The problem is again the same when I select the option to send the message, ans its the permission denied error. However when in the line 15 I change the channel to 9 which is the standard OBEX Object Push service it works fine, but the messages are tranferred to inbox whose contents I cannot read.

P.S. threading module is taken from the desktop version of python and installed as lib module.

[aya42]

The problem is again the same when I select the option to send the message, ans its the permission denied error. However when in the line 15 I change the channel to 9 which is the standard OBEX Object Push service it works fine, but the messages are tranferred to inbox whose contents I cannot read.

Sadly I don't have two S60 devices to test on, unless there's some way I can get my phone to connect to itself via Bluetooth. It might be that you have to bypass OBEX, and use the low-level RFCOMM interface.

With regards to the threading issue, you can 'kill' one thread from another like this:

import e32, thread

def thread1():
    global thread2running
    thread2running = True
    thread.start_new_thread(thread2, ())
    e32.ao_sleep(5)
    thread2running = False

def thread2():
    global thread2running
    while thread2running:
        do_something()

thread1()

[ra.ravi.rav]

import e32, thread

def thread1():
global thread2running
thread2running = True
thread.start_new_thread(thread2, ())
e32.ao_sleep(5)
thread2running = False

def thread2():
global thread2running
while thread2running:
do_something()

thread1()

How do I kill the thread this way? Because do_something() is a blocking wait to receieve the data. So the while loop's condtition is not checked next time.

[aya42]

How do I kill the thread this way? Because do_something() is a blocking wait to receieve the data. So the while loop's condtition is not checked next time.

Simple answer: you can't.

There is no way to forcibly kill a thread in Python. And even if there were, it's generally not a good idea to do so.

However, as I said before, I don't think you can achieve what you want with the OBEX protocol, so it's a non-issue.
Use the low-level interface with non-blocking IO, and you won't even need to start a new thread. There's an example in http://wiki.opensource.nokia.com/ima..._PyS60_1_2.pdf.

[ra.ravi.rav]

Well I can't understand the code! Can you please help.

[aya42]

Well I can't understand the code! Can you please help.

I'm still trying to get a working solution. There seem to be some bugs in non-blocking IO.

In the meantime, have a look at: http://discussion.forum.nokia.com/fo...83&postcount=2.