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. 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. Regards, -- Anderson Lizardo Instituto Nokia de Tecnologia - INdT Manaus - Brazil -- 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
