Hi， Luiz Here there is no pair operation in our end. Our rough idea is the below. 1. ble scan 2. ble connect from central to peripheral. 3. central app writes data in characteristic A offered by peripheral 4. central app subscribes characteristic B offered by peripheral app, which is used to receive indication data from peripheral. I am using 2 btvirt, one is 00:AA:01:00:00:23(peripheral), another is 00:AA:01:01:00:24 (central) For previous reproduced step: 1. Assume server has one characteristic A that is subscribed by client and sending indication, 2. Then ble connection is disconnected by client directly or connection disappear without unsubscribing A. 3. Client tries to connect to ble successfully 4. Client fails to subscribe that characteristic A although ble connection is ok. 5. Another retry to make Ble connection and subscribe to A can work. The below logs in bluetoothd are from step 2: ble disconnect seems not clean anything related to gatt notification. src/gatt-database.c:send_notification_to_device() GATT server sending indication src/gatt-database.c:conf_cb() GATT server received confirmation src/device.c:gatt_debug() Write Req - handle: 0x003f src/gatt-database.c:send_notification_to_device() GATT server sending indication src/gatt-database.c:conf_cb() GATT server received confirmation src/service.c:change_state() 0x925b20: device 00:AA:01:00:00:23 profile gap-profile state changed: connected -> disconnecting (0) src/service.c:change_state() 0x925b20: device 00:AA:01:00:00:23 profile gap-profile state changed: disconnecting -> disconnected (0) src/adapter.c:dev_disconnected() Device 00:AA:01:00:00:23 disconnected, reason 2 src/adapter.c:adapter_remove_connection() plugins/policy.c:disconnect_cb() reason 2 src/adapter.c:bonding_attempt_complete() hci1 bdaddr 00:AA:01:00:00:23 type 1 status 0xe src/device.c:device_bonding_complete() bonding (nil) status 0x0e src/device.c:device_bonding_failed() status 14 src/adapter.c:resume_discovery() src/device.c:att_disconnected_cb() src/device.c:att_disconnected_cb() Connection reset by peer (104) src/service.c:change_state() 0x9103e0: device 00:AA:01:01:00:24 profile gap-profile state changed: connected -> disconnecting (0) src/service.c:change_state() 0x9103e0: device 00:AA:01:01:00:24 profile gap-profile state changed: disconnecting -> disconnected (0) src/gatt-client.c:btd_gatt_client_disconnected() Device disconnected. Cleaning up. src/device.c:att_disconnected_cb() Automatic connection disabled attrib/gattrib.c:g_attrib_unref() 0x91d190: g_attrib_unref=0 src/adapter.c:dev_disconnected() Device 00:AA:01:01:00:24 disconnected, reason 3 src/adapter.c:adapter_remove_connection() plugins/policy.c:disconnect_cb() reason 3 src/adapter.c:bonding_attempt_complete() hci0 bdaddr 00:AA:01:01:00:24 type 1 status 0xe src/device.c:device_bonding_complete() bonding (nil) status 0x0e src/device.c:device_bonding_failed() status 14 src/device.c:att_disconnected_cb() src/device.c:att_disconnected_cb() Connection reset by peer (104) src/gatt-client.c:btd_gatt_client_disconnected() Device disconnected. Cleaning up. src/device.c:att_disconnected_cb() Automatic connection disabled attrib/gattrib.c:g_attrib_unref() 0x925000: g_attrib_unref=0 The below logs in bluetoothd are from step 4: Client fails to subscribe that characteristic A although ble connection is ok. from the log, it seems it is cleaning gatt notification in https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/src/gatt-database.c#n2005 src/device.c:gatt_debug() start: 0x0001, end: 0x0005, uuid: 00001800-0000-1000-8000-00805f9b34fb src/device.c:gatt_debug() start: 0x0006, end: 0x0009, uuid: 00001801-0000-1000-8000-00805f9b34fb src/device.c:gatt_client_ready_cb() status: success, error: 10 src/gatt-client.c:create_services() Exporting objects for GATT services: 00:AA:01:01:00:24 src/device.c:device_svc_resolved() /org/bluez/hci0/dev_00_AA_01_01_00_24 err 0 src/device.c:gatt_debug() Read Req - handle: 0x0003 src/gatt-database.c:gap_device_name_read_cb() GAP Device Name read request profiles/gap/gas.c:read_device_name_cb() GAP Device Name: N0002 src/device.c:btd_device_device_set_name() /org/bluez/hci1/dev_00_AA_01_00_00_23 N0002 src/device.c:gatt_debug() Write Req - handle: 0x0009 src/gatt-database.c:gatt_ccc_write_cb() CCC write called for handle: 0x0009 src/device.c:gatt_debug() Registered handler for "Service Changed": 1 src/device.c:gatt_debug() Read Req - handle: 0x0005 src/gatt-database.c:gap_appearance_read_cb() GAP Appearance read request profiles/gap/gas.c:read_appearance_cb() GAP Appearance: 0x0000 src/device.c:gatt_debug() Write Req - handle: 0x0039 src/gatt-client.c:notify_client_ref() owner :1.122201 src/device.c:gatt_debug() Write Req - handle: 0x0037 src/gatt-database.c:gatt_ccc_write_cb() CCC write called for handle: 0x0037 src/gatt-client.c:notify_client_unref() owner :1.122201 src/gatt-client.c:notify_client_free() owner :1.122201 src/device.c:gatt_debug() Write Req - handle: 0x0037 src/gatt-database.c:gatt_ccc_write_cb() CCC write called for handle: 0x0037 src/gatt-database.c:ccc_write_cb() External CCC write received with value: 0x0000 src/gatt-database.c:pipe_hup() 0x921290 closed src/gatt-database.c:proxy_removed_cb() Proxy removed - removing service: /org/bluez/xxxx/xxx src/gatt-database.c:gatt_db_service_removed() Local GATT service removed src/gatt-database.c:send_notification_to_device() GATT server sending indication src/gatt-database.c:client_disconnect_cb() Client disconnected src/advertising.c:client_disconnect_cb() Client disconnected src/device.c:gatt_debug() Service Changed received - start: 0x0034 end: 0x0039 src/gatt-database.c:conf_cb() GATT server received confirmation src/device.c:gatt_debug() Read By Grp Type - start: 0x0034 end: 0x0039 src/device.c:gatt_debug() Primary service discovery failed. ATT ECODE: 0x0a src/device.c:gatt_debug() Read By Grp Type - start: 0x0034 end: 0x0039 src/device.c:gatt_debug() Secondary service discovery failed. ATT ECODE: 0x0a src/device.c:gatt_debug() Read By Type - start: 0x0000 end: 0x0000 src/device.c:gatt_debug() service disappeared: start 0x0034 end 0x0039 src/device.c:gatt_service_removed() start: 0x0034, end: 0x0039 Any idea? Thanks Best wishes Yunhan On Tue, Oct 10, 2017 at 1:19 AM, Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx> wrote: > Hi Yunhan, > > On Tue, Oct 10, 2017 at 11:02 AM, Yunhan Wang <yunhanw@xxxxxxxxxxxx> wrote: >> Hi, Luiz >> >> Please ignore the previous email. >> >> I am seeing a bluez gatt notification problem in gatt-database.c >> >> Here is scenario: >> >> 1. Assume server has one characteristic A that is subscribed by client >> and sending notification, >> 2. Then ble connection is disconnected by client directly or >> connection disappear without unsubscribing A. >> 3. Client tries to connect to ble successfully >> 4. Client fails to subscribe that characteristic A although ble >> connection is ok. >> 5. Another retry to make Ble connection and subscribe to A can work. >> >> It seems ble disconnect at step 2 only disconnect ble connection and >> does not cleanup notify_io and stop >> notification in step 3 at code, >> https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/src/gatt-database.c >> >> It seems retry in step 4 would trigger ccc_write_cb and release >> notify_io and stop notification so that step 5 would succeed. >> partial log from step 4: >> ccc_write_cb() External CCC write received with value: 0x0000 >> pipe_hup() 0x921290 closed >> >> Any idea? > > Do you have the full logs, this might be a bug since perhaps we > cleanup the notification itself though if the device is paired the > subscription should be persisted. > > -- > 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
