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charset="iso-2022-jp" content-transfer-encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: jp.ricoh.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: OS3PR01MB6837.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 618680cc-f5ff-4b4a-32f8-08d9766f8aef X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Sep 2021 04:32:49.2750 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: e717ec3d-6036-4776-b72e-41f49481d91e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: gGq4oFDHC8t2U6smUTI7a0ldhBMhhkXKROu2afAe97q3t12SHlj61Sbv4kxRMMh5oFS2nW6VlfBRSjR+5zRcAz802y54wuHGsWTUC2rRED8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: OS0PR01MB6417 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Hello All, I am developing a system that communicates with BLE on Raspberry Pi. When the developed system is operated, HCI link down occurs several times= a week and BLE communication is disconnected. Shows the results of syslog and hcidump when communication is interrupted= . >From the result of hcidump, I think that it is a problem of hci because c= ommunication is not interrupted, but what kind of cause can be considered= ? Would you please suggest a solution? Thank you for your help. Best regards, Hideki Takahashi [Execution environment] =1B$B!&=1B(BRaspberry pi 3 model b =1B$B!&=1B(BRaspbian Buster 10 Linux raspberrypi 4.19.57-v7+ =1B$B!&=1B(BBlueZ 5.58 =1B$B!&=1B(BBroadcom BCM43438 [syslog] Jun 1 14:59:31 raspberrypi kernel: [2678208.088754] Bluetooth: hci0: lin= k tx timeout Jun 1 14:59:31 raspberrypi kernel: [2678208.088765] Bluetooth: hci0: kil= ling stalled connection xx:xx:xx:xx:xx:xx Jun 1 14:59:31 raspberrypi bluetoothd[901]: src/adapter.c:dev_disconnect= ed() Device xx:xx:xx:xx:xx:xx disconnected, reason 2 Jun 1 14:59:31 raspberrypi bluetoothd[901]: src/adapter.c:adapter_remove= _connection() = Jun 1 14:59:31 raspberrypi bluetoothd[901]: plugins/policy.c:disconnect_= cb() reason 2 Jun 1 14:59:31 raspberrypi bluetoothd[901]: src/adapter.c:bonding_attemp= t_complete() hci0 bdaddr xx:xx:xx:xx:xx:xx type 1 status 0xe Jun 1 14:59:31 raspberrypi bluetoothd[901]: src/device.c:device_bonding_= complete() bonding (nil) status 0x0e Jun 1 14:59:31 raspberrypi bluetoothd[901]: src/device.c:device_bonding_= failed() status 14 Jun 1 14:59:31 raspberrypi bluetoothd[901]: src/adapter.c:resume_discove= ry() = Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/agent.c:add_default_agen= t() Default agent set to :1.108 /org/bluez/agent Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/adapter.c:set_mode() sen= ding set mode command for index 0 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/agent.c:agent_ref() 0x56= 8110: ref=3D1 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/agent.c:register_agent()= agent :1.108 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/adapter.c:new_settings_c= allback() Settings: 0x00000ad1 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/adapter.c:settings_chang= ed() Changed settings: 0x00000010 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/adapter.c:settings_chang= ed() Pending settings: 0x00000000 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/device.c:device_remove()= Removing device /org/bluez/hci0/dev_xx_xx_xx_xx_xx_xx Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/device.c:btd_device_unre= f() Freeing device /org/bluez/hci0/dev_xx_xx_xx_xx_xx_xx Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/device.c:device_free() 0= x56bfb8 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/agent.c:agent_disconnect= () Agent :1.108 disconnected Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/agent.c:remove_default_a= gent() Default agent cleared Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/adapter.c:set_mode() sen= ding set mode command for index 0 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/agent.c:agent_destroy() = agent :1.108 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/agent.c:agent_unref() 0x= 568110: ref=3D0 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/adapter.c:new_settings_c= allback() Settings: 0x00000ac1 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/adapter.c:settings_chang= ed() Changed settings: 0x00000010 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/adapter.c:settings_chang= ed() Pending settings: 0x00000000 Jun 1 14:59:34 raspberrypi bluetoothd[901]: src/adapter.c:discovering_ca= llback() hci0 type 6 discovering 1 method 0 [hcidump] 2021-06-01 14:59:31.304383 > ACL data: handle 64 flags 0x02 dlen 27 ATT: Handle notify (0x1b) handle 0x0012 2021-06-01 14:59:31.304682 < HCI Command: Disconnect (0x01|0x0006) plen 3= handle 64 reason 0x13 Reason: Remote User Terminated Connection 2021-06-01 14:59:31.305089 > HCI Event: Command Status (0x0f) plen 4 Disconnect (0x01|0x0006) status 0x00 ncmd 1 2021-06-01 14:59:31.345332 > HCI Event: Disconn Complete (0x05) plen 4 status 0x00 handle 64 reason 0x16 Reason: Connection Terminated by Local Host 2021-06-01 14:59:34.992038 < HCI Command: LE Set Random Address (0x08|0x0= 005) plen 6 bdaddr 37:68:FE:C8:77:51 2021-06-01 14:59:34.992509 > HCI Event: Command Complete (0x0e) plen 4 LE Set Random Address (0x08|0x0005) ncmd 1 status 0x00