I am trying to open the L2Cap HID Channel and Interrupt so that I can send HID commands to a Bluetooth device.
I performed all my advertising and device processing and established a connection to the main network.
The Hid Control channel opens normally. When I try to create my kbluetoothL2CAPPSMHIDInterrupt connection
l2capChannelQueueSpaceAvailable
delegate method called (not sure what that means) followed by
l2capChannelOpenComplete
but the connection closes immediately, causing
l2capChannelClosed
How can I open this connection correctly?
I have been digging in the IOBlueTooth infrastructure and the bluetooth.org HID specification for a long time, but I have almost no useful information (which I can find at least).
When I trace my L2Cap channels, I see a few null values for
mIncomingDataListener
and
mEventDataListener
. I don't know how to install them or if they have anything to do with my problem ... just speculating.
The code snippet below is my attempt to make connections after establishing a connection with the device.
-(void)establishL2CappConnections:(IOBluetoothDevice*)device { IOReturn r; IOBluetoothL2CAPChannel *ch1; r = [device openL2CAPChannelSync:&ch1 withPSM:(BluetoothL2CAPPSM)kBluetoothL2CAPPSMHIDControl delegate:self]; self.mL2CappChannel=ch1; NSLog(@"r == %i",r); IOBluetoothL2CAPChannel *ch2; r = [device openL2CAPChannelSync:&ch2 withPSM:(BluetoothL2CAPPSM)kBluetoothL2CAPPSMHIDInterrupt delegate:self]; self.mL2CappInterruptChannel=ch2; NSLog(@"r == %i",r); }
Edit: 1
I plugged in my package logs. It's weird request for
kBluetoothL2CAPPSMSDP 0x0001
is created without my request, and then everything starts to trip.
BT Package Logs