Bluetooth in non-blocking application with Qt user interface

20 Feb 2010

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Hello,

I need your help porting my application Series60-Remote [1] to Mac OS X.
It is an open source software suite for S60 mobile phones, which is written in
Python. Its GUI is based on PyQt4 [2] and it uses Bluetooth to connect to a
mobile phone.

I tried to port this application to Mac OS X using lightblue as bluetooth
wrapper for IOBluetooth. I tried to handle the bluetooth connection in a
seperate thread (like in Linux and Windows) [3], but this seems to be not
possible with IOBluetooth.

My next try was to use an asynchronous connection instead and use IOBluetooth
directly. It works great with the attached Objective-C application [4].
But how can I use this wrapper in my Python application?
When I import this extension using objc I already have the Qt event loop
running. But I also have to start the Cocoa event loop (CFRunLoopRun()) if I
want to receive rfcommChannelData and rfcommChannelOpenComplete events?
Is it possible to integrate this event loop in Qt, like it is possible to
integrate the Qt event loop in GTK+?

Did anybody try something like this? Are there any examples?

Thank you for every help,
Lukas Hetzenecker

[1] http://series60-remote.sorceforge.net
[2] http://www.riverbankcomputing.co.uk/software/pyqt/intro
[3] thread.py (attachment)
[4] async.m (attachment)

from PyQt4.QtCore import *
from PyQt4.QtGui import *
import lightblue
import threading
import Foundation

#class Thread(QThread):
#or:
class Thread(threading.Thread):
    def run(self):
        pool = Foundation.NSAutoreleasePool.alloc().init()
        sock = lightblue.socket()
        print "connecting"
        sock.connect(('00:1B:AF:84:FF:E2', 18))
        print "connected"
        print "received",  sock.recv(1024)
        print "finish..."

class Button(QPushButton):
    def __init__(self):
        QPushButton.__init__(self,  "Start thread")
        self.connect(self,  SIGNAL("clicked()"),  self.start)

    def start(self):
        self.thread = Thread()
        self.thread.start()

app = QApplication([])
button = Button()
button.show()
app.exec_()

#import <Foundation/NSObject.h>
#import <IOBluetooth/objc/IOBluetoothDevice.h>
#import <IOBluetooth/objc/IOBluetoothDeviceInquiry.h>
#import <IOBluetooth/objc/IOBluetoothRFCOMMChannel.h>
#import <stdio.h>

@interface ConnectionHandler : NSObject {}
- (void)rfcommChannelOpenComplete:(IOBluetoothRFCOMMChannel*)channel
                           status:(IOReturn)status;
- (void)rfcommChannelData:(IOBluetoothRFCOMMChannel*)channel
                     data:(void *)dataPointer
                   length:(size_t)dataLength;
@end

@implementation ConnectionHandler
- (void)rfcommChannelOpenComplete:(IOBluetoothRFCOMMChannel*)channel
                           status:(IOReturn)status
{
    if( kIOReturnSuccess == status ) {
        printf("connection established\n");
        [channel writeSync: "110\x02\n" length: 5];
    } else {
        printf("Connection error!\n");
        CFRunLoopStop( CFRunLoopGetCurrent() );
    }
}
- (void)rfcommChannelData:(IOBluetoothRFCOMMChannel*)channel
                     data:(void *)dataPointer
                   length:(size_t)dataLength
{
    printf("received: %s\n", dataPointer);
    [channel writeSync: "110\x02\n" length: 5];
	CFRunLoopStop( CFRunLoopGetCurrent() );
}
@end

int main( int argc, const char *argv[] )
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    NSString *addr_str = @"00:1B:AF:84:FF:E2";
    BluetoothDeviceAddress addr;
    IOBluetoothNSStringToDeviceAddress( addr_str, &addr );
    IOBluetoothDevice *remote_device =
        [IOBluetoothDevice withAddress:&addr];
    IOBluetoothRFCOMMChannel *chan;
    ConnectionHandler *handler = [[ConnectionHandler alloc] init];

    [remote_device openRFCOMMChannelAsync:&chan withChannelID:18
                            delegate: handler];

    CFRunLoopRun();

    printf("exited!");

    [handler release];
    [pool release];
    return 0;
}

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