Hi Natalya, On Mon, Jul 24, 2017 at 6:03 PM, Natalya Rozhnova <rozhnova.natalya@xxxxxxxxx> wrote: > Hello, > > I am trying to understand the difference between the gatt_db stored in > the device structure and the one stored in bt_gatt_client structure. I > see that the database stored in the device is recovered from the > cache. I would like to understand what it is used for if anyway the > new one is created during the discover_services phase? Another > question that would very probably help me to understand this better: > if I copy the device->db to client->db, would it still work or we > really need to pass by a communication with a BLE device and compose > the database from scratch? > > Could anybody explain me this please? The gatt_db is passed over to bt_gatt_client_new, that way the client can inspect if the attributes were already in place and skip deep discovery: https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/src/shared/gatt-client.c#n1831 As you can see above the client->db is a reference to device->db, so there is just one instance of the db per device. -- Luiz Augusto von Dentz -- 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
