案例1--蓝牙音箱电量用完后，配对一直失败，提示PIN码不正确

基于MTK平台，通过MTKLogger开启保存HCI日志

问题定位分析

Android日志查看logcat 搜索到关键log

01-20 10:07:55.403760   978  1075 V bt_stack: [VERBOSE2:btm_inq.cc(2032)] BDA 74:a3:4a:0f:e3:2b
01-20 10:07:55.403878   978  1075 V bt_stack: [VERBOSE2:btm_inq.cc(2035)] Inquire BDA 74:a3:4a:0f:e3:2b
01-20 10:07:55.403948   978  1075 V bt_stack: [VERBOSE1:btm_inq.cc(951)] BTM_InqDbRead: bd addr 74:a3:4a:0f:e3:2b
01-20 10:07:55.403981   978  1075 D bt_btm  : btm_find_dev_type - device_type = 1 addr_type = 0
01-20 10:07:55.404019   978  1075 I bt_btm  : btm_sec_rmt_name_request_complete
01-20 10:07:55.404041   978  1075 D bt_btm  : btm_acl_resubmit_page
01-20 10:07:55.404081   978  1075 I bt_btm  : btm_sec_rmt_name_request_complete PairState: GET_REM_NAME  RemName:   status: 19 State:0  p_dev_rec: 0x9ffc9000 
01-20 10:07:55.404137   978  1075 I bt_btm  : btm_sec_rmt_name_request_complete() continue bonding sm4: 0x0000, status:0x13
01-20 10:07:55.404160   978  1075 I bt_btm  : btm_sec_change_pairing_state()  Old: GET_REM_NAME
01-20 10:07:55.404181   978  1075 I bt_btm  : btm_sec_change_pairing_state()  New: IDLE pairing_flags:0x1
01-20 10:07:55.404336   978  1075 V bt_stack: [VERBOSE1:btm_inq.cc(951)] BTM_InqDbRead: bd addr 74:a3:4a:0f:e3:2b
01-20 10:07:55.404381   978  1075 D bt_btm  : btm_find_dev_type - device_type = 1 addr_type = 0
01-20 10:07:55.404414   978  1075 D bt_btif : btif_transfer_context event 3, len 280
01-20 10:07:55.404527   978  1018 D bt_btif : btif task fetched event a001
01-20 10:07:55.404553   978  1018 D bt_btif : btif_context_switched
01-20 10:07:55.404574   978  1018 I bt_btif : btif_dm_upstreams_evt: ev: BTA_DM_AUTH_CMPL_EVT
01-20 10:07:55.404596   978  1018 D bt_btif : btif_dm_auth_cmpl_evt: bond state=1, success=0, key_present=0
01-20 10:07:55.404619   978  1018 D bt_btif :  btif_dm_auth_cmpl_evt() Authentication fail reason 19

关键日志

01-20 10:07:55.404081   978  1075 I bt_btm  : btm_sec_rmt_name_request_complete PairState: GET_REM_NAME  RemName:   status: 19 State:0  p_dev_rec: 0x9ffc9000

01-20 10:07:55.404619   978  1018 D bt_btif :  btif_dm_auth_cmpl_evt() Authentication fail reason 19

HCI定位分析

根据这些信息，配对是链路层的行为，即在 HCI中搜索

进行搜索

一目了然，看到对端主动断开连接。