Hi Anderson, > -----Original Message----- > From: Anderson Lizardo [mailto:anderson.lizardo@xxxxxxxxxxxxx] > Sent: Wednesday, December 12, 2012 6:53 PM > To: Ting Chou > Cc: Johan Hedberg; linux-bluetooth@xxxxxxxxxxxxxxx > Subject: Re: [BLE] org.bluez.Device1.Connect() returns > org.bluez.Error.NotAvailable > > Hi Ting, > > On Wed, Dec 12, 2012 at 6:21 AM, Ting Chou <Ting.Chou@xxxxxxxxxxxxxx> > wrote: > > Do you mean once a LE device with internally supported profiles is > > discovered, it will be connected automatically? Which means I cannot > > connect manually, at the timing I prefer? > > > > Since with my BT 4.0 dongle, Adpater.StartDiscovery discover also LE > > devices, I thought I should use Device.Connect to connect to the > device. > > According to the General Connection Establishment procedure (GCEP, see > Core spec page 1716 for details), the host shall start scanning and: > > "When the Host discovers a device to which the Host may attempt to > connect, the Host shall stop the scanning, and initiate a connection > using the direct con- nection establishment procedure." > > That's exactly what BlueZ does for LE devices. For paired devices whose > profile is supported internally by BlueZ (e.g. a LE thermometer), the > GCEP will keep trying to connect to them, where "connect" means using > LE active/passive scan, followed by the procedure above. > Does this mean the "User selects a device to connect" in Figure 9.6 (Page 1715, Flow chart for a device performing the general connection establishment procedure) is not needed for supported devices? > For unsupported devices, IIRC there will be not attempt to keep re- > connecting to it (or even keep the connection up after service > discovery). This should be addressed by the generic GATT API in > attrib/client.c, but the current implementation has several limitations > and is not implementing a consistent API, therefore it will probably be > removed for first BlueZ 5.0 release, and a replacement (which should > probably address reconnection for external/proprietary GATT services) > will be implemented. > I'm not sure if I understand correctly. But do you mean the GCEP you mentioned above is applied while "reconnecting" to a supported device? Thanks, Ting -- 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
