Hi Scott, On Wed, Jan 18, 2012, Scott James Remnant wrote: > > On Wed, Jan 18, 2012, Scott James Remnant wrote: > >> The Bluetooth HID profile recommends (4.1, p24) that rather than > >> prompting the user for a PIN on the host, which then needs to be > >> entered into the connecting keyboard, instead the host simply generate > >> the PIN and display it to the user instead. Part of this will be > >> implemented as a plugin, but since UI is involved, the Agent is > >> involved as well. As far as I can tell, there are two options: > >> > >> > > 3) Keep using RequestPinCode and have let the agent be responsible for > > generating and showing a PIN to the user which is immediately sent as a > > reply to the agent callback (while the UI prompt remains). > > > > Marcel has specifically instructed me not to do that, stating that the > Agent is not supposed to be "smart" like this but only to directly > interact with the user. > > See http://thread.gmane.org/gmane.linux.bluez.kernel/20391 yesterday Well, it's what most BlueZ UIs do already now. They look for the LegacyPairing property in DeviceFound signals, and if it's True they will pre-generate and show a PIN to the user even before calling CreatePairedDevice (for devices that can be assumed to have an interactive PIN entering method). One problem that you'll face is that it's not guaranteed that your side will get the PIN request first or even at the same time as the other side. IIRC this depends on the controller manufacturer, who initiated the connection, what security mode you're using (3 has some special behavior), etc. I.e. in the worst case the user has already entered the PIN on the remote side when you get the request on your side. Then when you decide to auto-generate a PIN it's most certainly not going to match what the user already entered on the other device. For best interoperability with quirky devices I think the safest way would be to make your best guess whether the user is able to enter the PIN on the remote side (e.g. yes for a mobile phone, no for a headset and yes for a keyboard) but still give the possibility to override this if the user wants to enter the PIN by himself after all. Johan -- 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
