Hello Dave, On 9 February 2017 at 16:12, Dave Beal <dbeal@xxxxxxxxxxxxxxxx> wrote: > Hello - > > I'm trying to get a GATT client working on a Linux system that's > running BlueZ 5.19. Unfortunately, neither Python or glib are > available on this system, so my only choice is using libdbus. And did > I mention that I've never used D-Bus before? I have a GATT server on > another system that provides and advertises a custom service by its > 16-byte UUID. I'm trying to get my BlueZ-based system to access this > service. I've verified that I can discover the server by the UUID > that it advertises, and I can get BlueZ to manually connect to it. My > client app has successfully called Bluez's RegisterProfile method, I am using a newer version of BlueZ but I think it is still true that you don't need to use RegisterProfile to read information from a GATT server. I just use the Adapter API to scan, the Device API to connect and GATT API to read/write data > passing the UUID advertised by the server, but BlueZ never calls my > NewConnection method. In the options of the RegisterProfile call, I'm > setting "Role" to "client", "AutoConnect" to TRUE, and both > "RequireAuthorization" and "RequireAuthentication" to FALSE. I am > running bluetoothd with the -E (experimental) option. > > If I run bluetoothd in the foreground with both the -E and debug > option, this is what I see when I start my client app: > > bluetoothd[2126]: src/profile.c:register_profile() sender :1.20 > bluetoothd[2126]: src/profile.c:create_ext() Created "myRemoteControlProfile" > bluetoothd[2126]: src/profile.c:ext_device_probe() > myRemoteControlProfile probed with UUID > 119649b6-b656-22ae-e611-ba85a04effc5 > bluetoothd[2126]: src/service.c:change_state() 0x950d0: device > 24:71:89:09:AD:09 profile myRemoteControlProfile state changed: > unavailable -> disconnected (0) > > > That's all that happens. "myRemoteControlProfile" is the name of the > profile I registered with Bluez, > "119649b6-b656-22ae-e611-ba85a04effc5" is the UUID that I passed in > the RegisterProfile call and 24:71:89:09:AD:09 is the GATT server I'm > trying to interact with, so BlueZ seems to know that this remote > device provides the service I'm looking for. When I watch on the > server device, I never see BlueZ connecting to it. Isn't BlueZ > supposed to automatically connect to a device when it sees that the > device offers the service that I passed in RegisterProfile? Why don't > I get a NewConnection method call? What does it mean that my > registered profile never gets past the "disconnected" state? I know > that the GATT API was still considered experimental in BlueZ 5.19; > should I even expect this to work? Thanks! What I can say is that there have been some good improvements in the GATT API since 5.19 so I would encourage you to move to a newer version if you can. The latest version (5.43) has an example GATT client: http://git.kernel.org/cgit/bluetooth/bluez.git/tree/test/example-gatt-client There is no such example for 5.19. > > - Dave Beal > dbeal@xxxxxxxxxxxxxxxx > Cardinal Peak, LLC > -- > 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 -- 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
