SamKite
asked on
Limits to Bluetooth Inquiries
Hi
I have written a simple Bluetooth application (using the Windows CE Widcomm SDK) which merely scans for devices in the area. I have only tested this with two other devices and it works fine.
I would like to know if anyone has done any experiments to see what the maximum number of devices one inquiring device could find? I know that the limit to forming a piconet is 7, but my application is much simpler - just seeing what's out there.
I have programmed an iPAQ h4100 which will happily find my DLink dongle and Nokia cellphone. If I add another iPAQ things start getting a bit confused. I'm not sure if its my program or the Bluetooth radio on the device. I have found with the iPAQ that the Bluetooth radio is a little buggy, sometimes it won't find my dongle at all, if I just use the native device discovery on the PDA.
Any suggestions, former experience would be greatly appreciated,
Thanks
Sam
I have written a simple Bluetooth application (using the Windows CE Widcomm SDK) which merely scans for devices in the area. I have only tested this with two other devices and it works fine.
I would like to know if anyone has done any experiments to see what the maximum number of devices one inquiring device could find? I know that the limit to forming a piconet is 7, but my application is much simpler - just seeing what's out there.
I have programmed an iPAQ h4100 which will happily find my DLink dongle and Nokia cellphone. If I add another iPAQ things start getting a bit confused. I'm not sure if its my program or the Bluetooth radio on the device. I have found with the iPAQ that the Bluetooth radio is a little buggy, sometimes it won't find my dongle at all, if I just use the native device discovery on the PDA.
Any suggestions, former experience would be greatly appreciated,
Thanks
Sam
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I'm not 100% sure what you're trying to accomplish here. Bluetooth limits the number of concurrent connections to 7. Within a single connection with a device, there can, at least theoretically, be several different communications channels (though I'm not clear why you would want to do this), each multiplexed over a single RFCOMM link.
ASKER
I didn't consider the service side of things but it makes sense now that you mention it!
I was also wondering in terms of number of concurrent connections - for instance using RFCOMM (Virtual Serial Ports)- there must be some upper limit to the number of concurrent virtual connections one device could have with many others? I know that Bluetooth transmits on one port and listens on another, and I realise that these are not 'real' ports but surely there is some limit for this?
Thanks
Sam :-)