Hi Luiz, 2016-12-09 10:43 GMT+01:00 Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx>: > Hi Jose, > > On Thu, Dec 8, 2016 at 4:40 PM, José Bollo <jose.bollo@xxxxxxx> wrote: >> Hello, >> >> I observe a strange behaviour of bluez dbus interface. >> >> I'm using Cinolink BT 4.0 USB Adapter (CSR BC8510 chipset), Bluez 5.43 >> on debian and/or on fedora. >> >> When I first pair a BLE device, the services are correctly discovered >> and the GATT endpoints are created (a lot). >> >> Then I can use it as expected and it is nice. But when I turn off the >> computer and restart it, things become different. >> >> Because the devices are paired with LT key, they are still paired but >> the GATT services are not availables. I can connect to the device but >> it doesn't declares the GATT properties/attributes that I need. Also, >> the service advertises itself without effect. > > The attributes should be saved in cache but they are only reloaded on > demand once a connection happens. Also if the database changes the > cache can be invalidated removing its attributes, this has been > changed so premature disconnections don't cause that anymore but in > case the database do actually change their attributes will be > invalidated. So if your device is known to cause premature disconnects > please try with upstream version. That is probably the case, the device disconnects itself after a transaction. Its designer made it to improve battery life. The attribute stay available by DBUS until next restart. I'll try the upstream version and check whether attribute are available after a restart. (snip) > ConnectService? You mean Connect/ConnectProfile, those can be used in > case you want to force an active scanning + connect procedure, > otherwise the device shall be reconnected using passive scanning. Yes I meant ConnectProfile. Is it preferable to use ConnectProfile instead of Connect when only one profile is expected? The device is always advertising. I think that I have to connect explicitly because the connection is not automatic. > Luiz Augusto von Dentz Best regards José -- 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
