使用play_bt_source_example例子，耳机主动发起重连时会失败 (AUD-6485)

[sourxsunny]

现象和步骤：

1. 使用play_bt_source_example例子，esp32开机主动扫描并且连接上耳机。
   

2. 把耳机放到耳机盒子，连接会断开
   

3. 把耳机从耳机盒子拿出来，这时耳机会主动发起连接。
   

4. 这时，耳机会很快连接上esp32，但很快有会断开。
   

---

LOG如下：

*****************耳机放到盒子，断开连接

I (42710) BT_AVCT: AVCT_MsgReq
I (42720) BT_AVCT: len: 5
I (42720) BT_AVCT: AVCT_MsgReq
I (42720) BT_AVCT: len: 5
I (45230) BT_BTM: BTM_SetPowerMode: pm_id 128 BDA: a391c3f6 mode:0x0
I (45230) BT_L2CAP: L2CAP - Calling Disconnect_Ind_Cb(), CID: 0x0043 Conf Needed
I (45230) BT_L2CAP: L2CA_DisconnectRsp() CID: 0x0043
I (45230) BT_AVCT: AVCT_RemoveConn
I (45240) A2DP_STREAM: AVRC conn_state evt: state 0, [00:00:00:00:00:00]
I (45300) BT_BTM: BTM_SetPowerMode: pm_id 128 BDA: a391c3f6 mode:0x0
I (45300) BT_L2CAP: L2CAP - Calling Disconnect_Ind_Cb(), CID: 0x0040 Conf Needed
I (45300) BT_L2CAP: L2CA_DisconnectRsp() CID: 0x0040
I (45310) BT_BTM: BTM_SetLinkPolicy hold not supported (settings: 0x000d)

I (45310) BT_BTM: BTM_SetLinkPolicy park not supported (settings: 0x0005)

I (45320) BT_L2CAP: L2CA_SetDesireRole() new:x80, disallow_switch:0
I (45320) BT_L2CAP: L2CA_SetDesireRole() new:x0, disallow_switch:0
I (45330) BT_L2CAP: L2CA_SetDesireRole() new:x0, disallow_switch:0
W (45340) BT_APPL: bta_dm_act no entry for connected service cbs
I (45340) BT_BTM: BTM_SetPowerMode: pm_id 128 BDA: a391c3f6 mode:0x0
I (45350) BT_L2CAP: L2CAP - Calling Disconnect_Ind_Cb(), CID: 0x0042 Conf Needed
I (45360) BT_L2CAP: L2CA_DisconnectRsp() CID: 0x0042
I (45360) A2DP_STREAM: a2dp source disconnected
W (45370) BLUETOOTH_SOURCE_EXAMPLE: [ * ] Bluetooth disconnected or suspended
E (45370) BT_LOG: esp_a2d_media_ctrl 4

W (45370) BT_LOG: ESP_A2D_MEDIA_CTRL_STOP is deprecated, using ESP_A2D_MEDIA_CTRL_SUSPEND instead.

W (49360) BT_HCI: hci cmd send: disconnect: hdl 0x80, rsn:0x13
W (49510) BT_HCI: hcif disc complete: hdl 0x80, rsn 0x16 dev_find 1
I (49510) BT_L2CAP: L2CA_SetDesireRole() new:x0, disallow_switch:0

---

*****************耳机从盒子拿出来，耳机主动去连接32

I (63240) BT_BTM: btm_sec_set_peer_sec_caps: sm4: 0x11, rmt_support_for_secure_connections 0

I (63240) BT_BTM: btm_acl_created: pend:0

W (63240) BT_HCI: hcif conn complete: hdl 0x81, st 0x0
I (63250) BT_L2CAP: L2CA_SetDesireRole() new:x0, disallow_switch:0
I (63250) BT_BTM: BTM_InqDbRead: bd addr [b0f1a391c3f6]

I (63360) BT_BTM: BTM_SetPowerMode: pm_id 128 BDA: a391c3f6 mode:0x0
I (63360) BT_L2CAP: L2CAP - Calling Connect_Ind_Cb(), CID: 0x0040
I (63360) BT_L2CAP: L2CA_ErtmConnectRsp() CID: 0x0040 Result: 0 Status: 0 BDA: b0f1a391c3f6 p_ertm_info:0x0
I (63370) BT_L2CAP: L2CA_ConfigReq() CID 0x0040: fcr_present:0 (mode 0) mtu_present:1 (672)
I (63390) BT_L2CAP: L2CA_ConfigRsp() CID: 0x0040 Result: 0 MTU present:0 Flush TO:0 FCR:0 FCS:0
I (63390) BT_L2CAP: L2CAP - Calling Config_Rsp_Cb(), CID: 0x0040
I (63530) BT_BTM: BTM_SetPowerMode: pm_id 128 BDA: a391c3f6 mode:0x0
I (63530) BT_L2CAP: L2CAP - Calling Disconnect_Ind_Cb(), CID: 0x0040 Conf Needed
I (63530) BT_L2CAP: L2CA_DisconnectRsp() CID: 0x0040
W (64520) BT_HCI: hcif disc complete: hdl 0x81, rsn 0x16 dev_find 1
I (64520) BT_L2CAP: L2CA_SetDesireRole() new:x0, disallow_switch:0

连上后，会马上出现断开。

[Marcus-bot]

当蓝牙断开连接时将会执行periph_bluetooth_stop并break终止程序。如果你对example做了修改，可以提供修改后的代码

[Marcus-bot]

我们对该example做了如下的修改并尝试复现你的现象，但是重连后连接稳定，并未出现断连情况

/* Stop when the Bluetooth is disconnected or suspended */
if (msg.source_type == PERIPH_ID_BLUETOOTH
    && msg.source == (void *)bt_periph) {
    if ((msg.cmd == PERIPH_BLUETOOTH_DISCONNECTED) || (msg.cmd == PERIPH_BLUETOOTH_AUDIO_SUSPENDED)) {
        ESP_LOGW(TAG, "[ * ] Bluetooth disconnected or suspended");
        esp_bt_gap_set_scan_mode(ESP_BT_CONNECTABLE, ESP_BT_GENERAL_DISCOVERABLE);
        // periph_bluetooth_stop(bt_periph);
        // break;
    }
}

可以检查你的代码改动或更换其他耳机尝试

[Marcus-bot]

如果想要sink重新连接source后继续播放音乐，可在ADF中增加如下逻辑

--- a/components/bluetooth_service/bluetooth_service.c
+++ b/components/bluetooth_service/bluetooth_service.c
@@ -532,6 +532,15 @@ static void bt_a2d_source_cb(esp_a2d_cb_event_t event, esp_a2d_cb_param_t *param
         case BT_SOURCE_STATE_DISCOVERED:
             break;
         case BT_SOURCE_STATE_UNCONNECTED:
+            // add to support a2d reconnection
+            if (param->conn_stat.state == ESP_A2D_CONNECTION_STATE_CONNECTED) {
+                ESP_LOGI(TAG, "a2dp connected");
+                ESP_LOGE(TAG,"param->conn_stat.state %x",param->conn_stat.state);
+                g_bt_service->source_a2d_state = BT_SOURCE_STATE_CONNECTED;
+                esp_a2d_media_ctrl(ESP_A2D_MEDIA_CTRL_CHECK_SRC_RDY);
+            } else {
+                ESP_LOGE(TAG,"param->conn_stat.state %x",param->conn_stat.state);
+            }