By using 32feet.net libraries I manage to discover bluetooth enabled devices in range. for some reason it hangs and the program goes not responding. what kind of a bug is this? how can I over come this? I used 5 seconds timer to discover devices. Codes are written in C# is this a problem in32feet library?

 discovering devices does take time ...

which timer do you mean`?

code would be helpful

 I use the in built timer  (using C#) for trigering the discovery event for every 5 seconds. the sudden froze arise as i try to close the program. 

public Dictionary<string,string> testMethod()
        {
                      
            Dictionary<string,string> btDictionary = new Dictionary<string, string>();
           
            BluetoothDeviceInfo[ devices = bc.DiscoverDevices(8, true, false, true);
            foreach (BluetoothDeviceInfo test in devices)
            {
                           
                //btItems.Add(test.DeviceName + " " + test.DeviceAddress + " " + test.Connected);
           
                btDictionary.Add(test.DeviceAddress.ToString(), test.DeviceName);

            }
            return btDictionary;

        }

I guess this is caused by the default discover time.

For unknown devices, the method DiscoverDevices(int maxDevices, bool authenticated, bool remembered, bool unknown ) of BluetoothClient takes default 10 seconds, that is, the last parameter is set "true".

You can change the value by setting the property "InquiryLength". 

Please see http://inthehand.com/library/html/P_InTheHand_Net_Sockets_BluetoothClient_InquiryLength.htm

Thanks for the reply. i did not understand in how to change theInquiryLenght. can you give a sample code on how to  handle it?

Device discovery / Inquiry in Bluetooth is slow...  It takes more than ten seconds in my experience.  One can change the time the discovery will abort with the InquiryLength property, but that means that you won't get to know all the devices in range.

You could try running the discovery on a background thread and updating a shared list of devices but do you really need to know the devices in range so often??

Hello,

I have a question...

If the InquiryLength less than default value, devices with short distance in range will be discovered?

I don't really know.  My educated *guess* is that the discoverying (inquiring) device sends out the multiple discovery requests including an id, each device in range sees if the id matches its address some function of its address and responds then [if (id == compress(myAddress)) then Respond].  So I don't think the distance matters...