| Message ID | 98ccef96a4b719599c0fb1d085c7239a12d2ed8c.1676226143.git.pav@iki.fi |
|---|---|
| State | New |
| Headers | show |
| Series | [BlueZ] shared/bap: wait for GATT client ready before ASCS/PACS discovery | expand |
Hi Pauli, On Sun, Feb 12, 2023 at 1:50 PM Pauli Virtanen <pav@iki.fi> wrote: > > Hi Luiz, > > su, 2023-02-12 kello 12:45 -0800, Luiz Augusto von Dentz kirjoitti: > > Hi Pauli, > > > > On Sun, Feb 12, 2023 at 10:41 AM Pauli Virtanen <pav@iki.fi> wrote: > > > > > > BAP client fails to find endpoints if GATT services are not resolved > > > when the GATT client is attached to the session. This condition > > > almost always occurs on the first BAP connection to a device between > > > bluetoothd restarts, and may occur also otherwise. > > > > Hmm, this shouldn't happen if you have caching enabled, did you > > disable it for some reason? > > Caching has not been disabled. The files in /var/lib/bluetooth/*/cache > also get updated so presumably it is working. > > > > The BAP client code discovers ASCS/PACS services and characteristics at > > > client attach time. > > > > > > Fix the connection issue by postponing PAC/ASE discovery until the > > > GATT client is ready, if it was not ready at attach time. > > > > This should probably be done by the core, it should check if the > > services are cached then it can call accept, otherwise it needs to > > wait for the client to be ready, perhaps there is something not quite > > right with the way to probe services as afaik if we don't have any > > cache the driver shouldn't have been called to begin with. > > bap_accept gets called from > > #0 bap_accept (service=0x604000005f50) at profiles/audio/bap.c:1304 > #1 0x0000000000631755 in service_accept (service=0x604000005f50, initiator=true) at src/service.c:203 > #2 0x0000000000668561 in device_accept_gatt_profiles (device=0x617000000080) at src/device.c:3739 > #3 0x0000000000676128 in gatt_client_init (device=0x617000000080) at src/device.c:5161 > #4 0x00000000006782e5 in device_attach_att (dev=0x617000000080, io=0x60c00000b2c0) at src/device.c:5331 > #5 0x00000000006788e5 in att_connect_cb (io=0x60c00000b2c0, gerr=0x0, user_data=0x617000000080) at src/device.c:5378 > #6 0x000000000053de23 in connect_cb (io=0x60c00000b2c0, cond=G_IO_OUT, user_data=0x60300001f8d0) at btio/btio.c:229 > #7 0x00007f4955d16cbf in g_main_context_dispatch () from target:/lib64/libglib-2.0.so.0 > #8 0x00007f4955d6c598 in g_main_context_iterate.constprop () from target:/lib64/libglib-2.0.so.0 > #9 0x00007f4955d1628f in g_main_loop_run () from target:/lib64/libglib-2.0.so.0 > #10 0x00000000007df9ca in mainloop_run () at src/shared/mainloop-glib.c:66 > #11 0x00000000007e075a in mainloop_run_with_signal (func=0x558597 <signal_callback>, user_data=0x0) at src/shared/mainloop-notify.c:188 > #12 0x0000000000558e97 in main (argc=1, argv=0x7ffd399f7788) at src/main.c:1304 > > which does not wait for GATT client ready. The comment above that > > 5157│ /* > 5158│ * Notify notify existing service about the new connection so they can > 5159│ * react to notifications while discovering services > 5160│ */ > > looks like this is intentional. If it's like this, then services would > need to explicitly wait. > > Didn't look yet how come it knows the gatt service is there then, > however I guess it only looks for the PACS service uuid, as I think > nothing tells device.c also ASCS would be needed. We do load the database from cache in case there is one: https://github.com/bluez/bluez/blob/master/src/device.c#L5328 Or are you experiencing some problem where PACS is cached but ASCS isn't? > Best, > Pauli > > > > > > --- > > > > > > Notes: > > > Typical bluetoothctl output in the failing case, without this patch: > > > > > > $ sudo systemctl restart bluetooth > > > $ bluetoothctl > > > ... > > > [bluetooth]# connect XX:XX:XX:XX:XX:XX > > > Attempting to connect to XX:XX:XX:XX:XX:XX > > > [CHG] Device XX:XX:XX:XX:XX:XX Connected: yes > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 0000184e-0000-1000-8000-00805f9b34fb > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001850-0000-1000-8000-00805f9b34fb > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 03b80e5a-ede8-4b33-a751-6ce34ec4c700 > > > Connection successful > > > [NEW] Primary Service (Handle 0x0000) > > > /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/service0008 > > > 00001801-0000-1000-8000-00805f9b34fb > > > Generic Attribute Profile > > > ... > > > [NEW] Descriptor (Handle 0x0000) > > > /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/service0065/char0066/desc0069 > > > 00002901-0000-1000-8000-00805f9b34fb > > > Characteristic User Description > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001800-0000-1000-8000-00805f9b34fb > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001801-0000-1000-8000-00805f9b34fb > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 0000180a-0000-1000-8000-00805f9b34fb > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001844-0000-1000-8000-00805f9b34fb > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 0000184e-0000-1000-8000-00805f9b34fb > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001850-0000-1000-8000-00805f9b34fb > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 03b80e5a-ede8-4b33-a751-6ce34ec4c700 > > > [CHG] Device XX:XX:XX:XX:XX:XX ServicesResolved: yes > > > [CHG] Device XX:XX:XX:XX:XX:XX Paired: yes > > > [xxx]# endpoint.list > > > [xxx]# disconnect > > > Attempting to disconnect from XX:XX:XX:XX:XX:XX > > > [CHG] Device XX:XX:XX:XX:XX:XX ServicesResolved: no > > > Successful disconnected > > > [CHG] Device XX:XX:XX:XX:XX:XX Connected: no > > > [bluetooth]# connect XX:XX:XX:XX:XX:XX > > > Attempting to connect to XX:XX:XX:XX:XX:XX > > > [CHG] Device XX:XX:XX:XX:XX:XX Connected: yes > > > Connection successful > > > [NEW] Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0 > > > [NEW] Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0 > > > [NEW] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 > > > [NEW] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 > > > [CHG] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 Links: /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 > > > [CHG] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 Links: /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 > > > [CHG] Device XX:XX:XX:XX:XX:XX ServicesResolved: yes > > > [xxx]# endpoint.list > > > Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0 > > > Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0 > > > [xxx]# > > > > > > Endpoints and transports failed to appear on the first connect to the > > > BAP server, since GATT discovery was not yet completed when the BAP code > > > tried to discover the endpoints. Second connection succeeded. > > > Occasionally, it also happens that endpoints appear but transports do > > > not, but this is hard to reproduce. > > > > > > With this patch: > > > > > > $ sudo systemctl restart bluetooth > > > $ bluetoothctl > > > ... > > > [bluetooth]# connect XX:XX:XX:XX:XX:XX > > > Attempting to connect to XX:XX:XX:XX:XX:XX > > > [CHG] Device XX:XX:XX:XX:XX:XX Connected: yes > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 0000184e-0000-1000-8000-00805f9b34fb > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001850-0000-1000-8000-00805f9b34fb > > > [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 03b80e5a-ede8-4b33-a751-6ce34ec4c700 > > > Connection successful > > > [NEW] Primary Service (Handle 0x0000) > > > /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/service0008 > > > 00001801-0000-1000-8000-00805f9b34fb > > > Generic Attribute Profile > > > ... > > > [NEW] Descriptor (Handle 0x0000) > > > /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/service0065/char0066/desc0069 > > > 00002901-0000-1000-8000-00805f9b34fb > > > Characteristic User Description > > > [CHG] Device XX:XX:XX:XX:XX:XX ServicesResolved: yes > > > [CHG] Device XX:XX:XX:XX:XX:XX Paired: yes > > > [NEW] Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0 > > > [NEW] Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0 > > > [NEW] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 > > > [NEW] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 > > > [CHG] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 Links: /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 > > > [CHG] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 Links: /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 > > > [xxx]# > > > > > > Now the first connection works properly. > > > > > > On first reading, the spec does not seem to clearly comment if ASEs and > > > PACs could be removed/added by the server while client is connected. If > > > that's allowed, then we'd need some bigger changes here. Regardless, > > > waiting for GATT client ready before first scan seems good also in this > > > case. > > > > > > src/shared/bap.c | 93 +++++++++++++++++++++++++++++++----------------- > > > 1 file changed, 60 insertions(+), 33 deletions(-) > > > > > > diff --git a/src/shared/bap.c b/src/shared/bap.c > > > index 22f2e6714..2d676d96f 100644 > > > --- a/src/shared/bap.c > > > +++ b/src/shared/bap.c > > > @@ -158,6 +158,7 @@ struct bt_bap { > > > struct bt_att *att; > > > struct bt_bap_req *req; > > > unsigned int cp_id; > > > + unsigned int client_ready_id; > > > > > > unsigned int process_id; > > > unsigned int disconn_id; > > > @@ -3733,41 +3734,10 @@ static void bap_attach_att(struct bt_bap *bap, struct bt_att *att) > > > bap, NULL); > > > } > > > > > > -bool bt_bap_attach(struct bt_bap *bap, struct bt_gatt_client *client) > > > +static void bap_attach_finish(struct bt_bap *bap) > > > { > > > bt_uuid_t uuid; > > > > > > - if (queue_find(sessions, NULL, bap)) { > > > - /* If instance already been set but there is no client proceed > > > - * to clone it otherwise considered it already attached. > > > - */ > > > - if (client && !bap->client) > > > - goto clone; > > > - return true; > > > - } > > > - > > > - if (!sessions) > > > - sessions = queue_new(); > > > - > > > - queue_push_tail(sessions, bap); > > > - > > > - queue_foreach(bap_cbs, bap_attached, bap); > > > - > > > - if (!client) { > > > - bap_attach_att(bap, bap->att); > > > - return true; > > > - } > > > - > > > - if (bap->client) > > > - return false; > > > - > > > -clone: > > > - bap->client = bt_gatt_client_clone(client); > > > - if (!bap->client) > > > - return false; > > > - > > > - bap_attach_att(bap, bt_gatt_client_get_att(client)); > > > - > > > if (bap->rdb->pacs) { > > > uint16_t value_handle; > > > struct bt_pacs *pacs = bap->rdb->pacs; > > > @@ -3798,7 +3768,7 @@ clone: > > > > > > bap_notify_ready(bap); > > > > > > - return true; > > > + return; > > > } > > > > > > bt_uuid16_create(&uuid, PACS_UUID); > > > @@ -3806,6 +3776,57 @@ clone: > > > > > > bt_uuid16_create(&uuid, ASCS_UUID); > > > gatt_db_foreach_service(bap->rdb->db, &uuid, foreach_ascs_service, bap); > > > +} > > > + > > > +static void bap_attach_ready_cb(bool success, uint8_t att_ecode, > > > + void *user_data) > > > +{ > > > + struct bt_bap *bap = user_data; > > > + > > > + bap->client_ready_id = 0; > > > + > > > + bap_attach_finish(bap); > > > +} > > > + > > > +bool bt_bap_attach(struct bt_bap *bap, struct bt_gatt_client *client) > > > +{ > > > + if (queue_find(sessions, NULL, bap)) { > > > + /* If instance already been set but there is no client proceed > > > + * to clone it otherwise considered it already attached. > > > + */ > > > + if (client && !bap->client) > > > + goto clone; > > > + return true; > > > + } > > > + > > > + if (!sessions) > > > + sessions = queue_new(); > > > + > > > + queue_push_tail(sessions, bap); > > > + > > > + queue_foreach(bap_cbs, bap_attached, bap); > > > + > > > + if (!client) { > > > + bap_attach_att(bap, bap->att); > > > + return true; > > > + } > > > + > > > + if (bap->client) > > > + return false; > > > + > > > +clone: > > > + bap->client = bt_gatt_client_clone(client); > > > + if (!bap->client) > > > + return false; > > > + > > > + bap_attach_att(bap, bt_gatt_client_get_att(bap->client)); > > > + > > > + if (bt_gatt_client_is_ready(bap->client)) { > > > + bap_attach_finish(bap); > > > + } else { > > > + bap->client_ready_id = bt_gatt_client_ready_register( > > > + bap->client, bap_attach_ready_cb, bap, NULL); > > > + } > > > > > > return true; > > > } > > > @@ -3824,6 +3845,12 @@ void bt_bap_detach(struct bt_bap *bap) > > > if (!queue_remove(sessions, bap)) > > > return; > > > > > > + if (bap->client_ready_id) { > > > + bt_gatt_client_ready_unregister(bap->client, > > > + bap->client_ready_id); > > > + bap->client_ready_id = 0; > > > + } > > > + > > > bt_gatt_client_unref(bap->client); > > > bap->client = NULL; > > > > > > -- > > > 2.39.1 > > > > > > > >
diff --git a/src/shared/bap.c b/src/shared/bap.c index 22f2e6714..2d676d96f 100644 --- a/src/shared/bap.c +++ b/src/shared/bap.c @@ -158,6 +158,7 @@ struct bt_bap { struct bt_att *att; struct bt_bap_req *req; unsigned int cp_id; + unsigned int client_ready_id; unsigned int process_id; unsigned int disconn_id; @@ -3733,41 +3734,10 @@ static void bap_attach_att(struct bt_bap *bap, struct bt_att *att) bap, NULL); } -bool bt_bap_attach(struct bt_bap *bap, struct bt_gatt_client *client) +static void bap_attach_finish(struct bt_bap *bap) { bt_uuid_t uuid; - if (queue_find(sessions, NULL, bap)) { - /* If instance already been set but there is no client proceed - * to clone it otherwise considered it already attached. - */ - if (client && !bap->client) - goto clone; - return true; - } - - if (!sessions) - sessions = queue_new(); - - queue_push_tail(sessions, bap); - - queue_foreach(bap_cbs, bap_attached, bap); - - if (!client) { - bap_attach_att(bap, bap->att); - return true; - } - - if (bap->client) - return false; - -clone: - bap->client = bt_gatt_client_clone(client); - if (!bap->client) - return false; - - bap_attach_att(bap, bt_gatt_client_get_att(client)); - if (bap->rdb->pacs) { uint16_t value_handle; struct bt_pacs *pacs = bap->rdb->pacs; @@ -3798,7 +3768,7 @@ clone: bap_notify_ready(bap); - return true; + return; } bt_uuid16_create(&uuid, PACS_UUID); @@ -3806,6 +3776,57 @@ clone: bt_uuid16_create(&uuid, ASCS_UUID); gatt_db_foreach_service(bap->rdb->db, &uuid, foreach_ascs_service, bap); +} + +static void bap_attach_ready_cb(bool success, uint8_t att_ecode, + void *user_data) +{ + struct bt_bap *bap = user_data; + + bap->client_ready_id = 0; + + bap_attach_finish(bap); +} + +bool bt_bap_attach(struct bt_bap *bap, struct bt_gatt_client *client) +{ + if (queue_find(sessions, NULL, bap)) { + /* If instance already been set but there is no client proceed + * to clone it otherwise considered it already attached. + */ + if (client && !bap->client) + goto clone; + return true; + } + + if (!sessions) + sessions = queue_new(); + + queue_push_tail(sessions, bap); + + queue_foreach(bap_cbs, bap_attached, bap); + + if (!client) { + bap_attach_att(bap, bap->att); + return true; + } + + if (bap->client) + return false; + +clone: + bap->client = bt_gatt_client_clone(client); + if (!bap->client) + return false; + + bap_attach_att(bap, bt_gatt_client_get_att(bap->client)); + + if (bt_gatt_client_is_ready(bap->client)) { + bap_attach_finish(bap); + } else { + bap->client_ready_id = bt_gatt_client_ready_register( + bap->client, bap_attach_ready_cb, bap, NULL); + } return true; } @@ -3824,6 +3845,12 @@ void bt_bap_detach(struct bt_bap *bap) if (!queue_remove(sessions, bap)) return; + if (bap->client_ready_id) { + bt_gatt_client_ready_unregister(bap->client, + bap->client_ready_id); + bap->client_ready_id = 0; + } + bt_gatt_client_unref(bap->client); bap->client = NULL;
BAP client fails to find endpoints if GATT services are not resolved when the GATT client is attached to the session. This condition almost always occurs on the first BAP connection to a device between bluetoothd restarts, and may occur also otherwise. The BAP client code discovers ASCS/PACS services and characteristics at client attach time. Fix the connection issue by postponing PAC/ASE discovery until the GATT client is ready, if it was not ready at attach time. --- Notes: Typical bluetoothctl output in the failing case, without this patch: $ sudo systemctl restart bluetooth $ bluetoothctl ... [bluetooth]# connect XX:XX:XX:XX:XX:XX Attempting to connect to XX:XX:XX:XX:XX:XX [CHG] Device XX:XX:XX:XX:XX:XX Connected: yes [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 0000184e-0000-1000-8000-00805f9b34fb [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001850-0000-1000-8000-00805f9b34fb [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 03b80e5a-ede8-4b33-a751-6ce34ec4c700 Connection successful [NEW] Primary Service (Handle 0x0000) /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/service0008 00001801-0000-1000-8000-00805f9b34fb Generic Attribute Profile ... [NEW] Descriptor (Handle 0x0000) /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/service0065/char0066/desc0069 00002901-0000-1000-8000-00805f9b34fb Characteristic User Description [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001800-0000-1000-8000-00805f9b34fb [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001801-0000-1000-8000-00805f9b34fb [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 0000180a-0000-1000-8000-00805f9b34fb [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001844-0000-1000-8000-00805f9b34fb [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 0000184e-0000-1000-8000-00805f9b34fb [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001850-0000-1000-8000-00805f9b34fb [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 03b80e5a-ede8-4b33-a751-6ce34ec4c700 [CHG] Device XX:XX:XX:XX:XX:XX ServicesResolved: yes [CHG] Device XX:XX:XX:XX:XX:XX Paired: yes [xxx]# endpoint.list [xxx]# disconnect Attempting to disconnect from XX:XX:XX:XX:XX:XX [CHG] Device XX:XX:XX:XX:XX:XX ServicesResolved: no Successful disconnected [CHG] Device XX:XX:XX:XX:XX:XX Connected: no [bluetooth]# connect XX:XX:XX:XX:XX:XX Attempting to connect to XX:XX:XX:XX:XX:XX [CHG] Device XX:XX:XX:XX:XX:XX Connected: yes Connection successful [NEW] Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0 [NEW] Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0 [NEW] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 [NEW] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 [CHG] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 Links: /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 [CHG] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 Links: /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 [CHG] Device XX:XX:XX:XX:XX:XX ServicesResolved: yes [xxx]# endpoint.list Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0 Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0 [xxx]# Endpoints and transports failed to appear on the first connect to the BAP server, since GATT discovery was not yet completed when the BAP code tried to discover the endpoints. Second connection succeeded. Occasionally, it also happens that endpoints appear but transports do not, but this is hard to reproduce. With this patch: $ sudo systemctl restart bluetooth $ bluetoothctl ... [bluetooth]# connect XX:XX:XX:XX:XX:XX Attempting to connect to XX:XX:XX:XX:XX:XX [CHG] Device XX:XX:XX:XX:XX:XX Connected: yes [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 0000184e-0000-1000-8000-00805f9b34fb [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 00001850-0000-1000-8000-00805f9b34fb [CHG] Device XX:XX:XX:XX:XX:XX UUIDs: 03b80e5a-ede8-4b33-a751-6ce34ec4c700 Connection successful [NEW] Primary Service (Handle 0x0000) /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/service0008 00001801-0000-1000-8000-00805f9b34fb Generic Attribute Profile ... [NEW] Descriptor (Handle 0x0000) /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/service0065/char0066/desc0069 00002901-0000-1000-8000-00805f9b34fb Characteristic User Description [CHG] Device XX:XX:XX:XX:XX:XX ServicesResolved: yes [CHG] Device XX:XX:XX:XX:XX:XX Paired: yes [NEW] Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0 [NEW] Endpoint /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0 [NEW] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 [NEW] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 [CHG] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 Links: /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 [CHG] Transport /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_sink0/fd1 Links: /org/bluez/hci0/dev_XX_XX_XX_XX_XX_XX/pac_source0/fd0 [xxx]# Now the first connection works properly. On first reading, the spec does not seem to clearly comment if ASEs and PACs could be removed/added by the server while client is connected. If that's allowed, then we'd need some bigger changes here. Regardless, waiting for GATT client ready before first scan seems good also in this case. src/shared/bap.c | 93 +++++++++++++++++++++++++++++++----------------- 1 file changed, 60 insertions(+), 33 deletions(-)