Arman, 2014-11-21 20:12 GMT+01:00 Arman Uguray <armansito@xxxxxxxxxxxx>: > Hi Gilles, > >> On Fri, Nov 21, 2014 at 12:03 AM, Gilles Grégoire <gilles.gregoire@xxxxxxxxx> wrote: >> Hi, >> >> I am trying to understand how a BLE connection is established between >> my embedded system and an Android phone. I am using bluez 5.9 on a >> 3.12 kernel on this embedded system; with a CSR chipset. >> >> I set up bluetooth using: >> hciconfig hci0 reset >> hciconfig hci0 noscan >> >> Then, I use hcitool to set the advertisement and scan data, and I >> enable a connectable advertisement with >> hcitool -i hci0 cmd 0x08 0x000a 01 >> >> I am _not_ using bluetoothd. >> >> With this simple setup, I can connect with an Android phone to my >> embedded system. >> I check it with: >> hcitool -i hci0 con >> >> Which reports one active connection. >> >> I had a look at the hciconfig and hcitool source code (the only tools >> I used to setup bluetooth), but could not find where a connection is >> accepted. >> >> My question is: where (in the code) is the connection accepted in the >> first place? >> >> Thanks! >> >> -- Gilles >> >> PS: my excuses for this repost. I realized that I forgot to set a >> subject for the initial version of this e-mail sent on this list >> yesterday. >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > If you're using just hcitool (and someone correct me if I'm wrong) > then the kernel will accept the connection but won't magically hand it > over to userland unless someone is listening for incoming connections. > For that you would have to create an L2CAP socket and listen on it. > Once a connection is accepted then you can use the returned socket > just as you would with any UNIX socket over which you can exchange > data. This is exactly the kind of answer I was looking for. I could not find this information anywhere. I still find this a bit surprising: when using an l2capSocket, I still have to listen() and accept() the connection. One would expect that without anyone accept()'ing, the connection is not accepted! Thanks a lot, -- Gilles -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
