Android在连接BLE设备的时候,遇到连接没多久就自动断开的情况。通过HCI来分析一下。

BLE设备发送连接参数更新请求
3909 15:53:01.224737 TexasIns_f0:d3:41 (Hon-RFID3) HandHeld_e0:e5:4f (EDA) L2CAP 21 Rcvd Connection Parameter Update Request
回复BLE发送过来的请求
3910 15:53:01.225744 HandHeld_e0:e5:4f (EDA) TexasIns_f0:d3:41 (Hon-RFID3) L2CAP 15 Sent Connection Parameter Update Response (Accepted)
发送连接更新请求,host通过hci发给controller
3911 15:53:01.227044 host controller HCI_CMD 18 Sent LE Connection Update
更新参数操作执行成功。controller发给host。这条命令之后,协议栈会发送命令给出去,给对面的BLE设备。
3963 15:53:01.566723 controller host HCI_EVT 13 Rcvd LE Meta (LE Connection Update Complete)
这边在等待BLE设备的回复,等待超时了。后面就断开。
5410 15:53:12.491452 controller host HCI_EVT 7 Rcvd Disconnect Complete

最后一个帧的内容,显示连接超时。

Frame 5410: 7 bytes on wire (56 bits), 7 bytes captured (56 bits)
Encapsulation type: Bluetooth H4 with linux header (99)
Arrival Time: Apr 25, 2019 23:53:12.491452000 China Standard Time
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1556207592.491452000 seconds
[Time delta from previous captured frame: 0.001655000 seconds]
[Time delta from previous displayed frame: 0.001655000 seconds]
[Time since reference or first frame: 86.503400000 seconds]
Frame Number: 5410
Frame Length: 7 bytes (56 bits)
Capture Length: 7 bytes (56 bits)
[Frame is marked: False]
[Frame is ignored: False]
Point-to-Point Direction: Received (1)
[Protocols in frame: bluetooth:hci_h4:bthci_evt]
Bluetooth
[Source: controller]
[Destination: host]
Bluetooth HCI H4
[Direction: Rcvd (0x01)]
HCI Packet Type: HCI Event (0x04)
Bluetooth HCI Event - Disconnect Complete
Event Code: Disconnect Complete (0x05)
Parameter Total Length: 4
Status: Success (0x00)
Connection Handle: 0x0002
Reason: Connection Timeout (0x08)

而另外一个台设备, 却不会断开,第一个帧显示对面LE设备所能支持结构,其中Connection Parameters Request Procedure: False,表示不支持更新参数请求。

第一个帧:
1408 15:57:13.490071 controller host HCI_EVT 15 Rcvd LE Meta (LE Read Remote Used Features Complete)
第一个帧的内容:
Frame 1408: 15 bytes on wire (120 bits), 15 bytes captured (120 bits)
Encapsulation type: Bluetooth H4 with linux header (99)
Arrival Time: Apr 25, 2019 23:57:13.490071000 China Standard Time
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1556207833.490071000 seconds
[Time delta from previous captured frame: 0.002823000 seconds]
[Time delta from previous displayed frame: 0.002823000 seconds]
[Time since reference or first frame: 39.218678000 seconds]
Frame Number: 1408
Frame Length: 15 bytes (120 bits)
Capture Length: 15 bytes (120 bits)
[Frame is marked: False]
[Frame is ignored: False]
Point-to-Point Direction: Received (1)
[Protocols in frame: bluetooth:hci_h4:bthci_evt]
Bluetooth
[Source: controller]
[Destination: host]
Bluetooth HCI H4
[Direction: Rcvd (0x01)]
HCI Packet Type: HCI Event (0x04)
Bluetooth HCI Event - LE Meta
Event Code: LE Meta (0x3e)
Parameter Total Length: 12
Sub Event: LE Read Remote Used Features Complete (0x04)
Status: Success (0x00)
Connection Handle: 0x0002
Supported LE Features: 0x0000000000000001, LE Encryption
.... .... .... .... .... .... .... .... .... .... .... .... .... .... .... ...1 = LE Encryption: True
.... .... .... .... .... .... .... .... .... .... .... .... .... .... .... ..0. = Connection Parameters Request Procedure: False
.... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .0.. = Extended Reject Indication: False
.... .... .... .... .... .... .... .... .... .... .... .... .... .... .... 0... = Slave-Initiated Features Exchange: False
.... .... .... .... .... .... .... .... .... .... .... .... .... .... ...0 .... = Ping: False
.... .... .... .... .... .... .... .... .... .... .... .... .... .... ..0. .... = Data Packet Length Extension: False
.... .... .... .... .... .... .... .... .... .... .... .... .... .... .0.. .... = LL Privacy: False
.... .... .... .... .... .... .... .... .... .... .... .... .... .... 0... .... = Extended Scanner Filter Policies: False
.... .... .... .... .... .... .... .... .... .... .... .... .... ...0 .... .... = LE 2M PHY: False
.... .... .... .... .... .... .... .... .... .... .... .... .... ..0. .... .... = Stable Modulation Index - Tx: False
.... .... .... .... .... .... .... .... .... .... .... .... .... .0.. .... .... = Stable Modulation Index - Rx: False
.... .... .... .... .... .... .... .... .... .... .... .... .... 0... .... .... = LE Coded PHY: False
.... .... .... .... .... .... .... .... .... .... .... .... ...0 .... .... .... = LE Extended Advertising: False
.... .... .... .... .... .... .... .... .... .... .... .... ..0. .... .... .... = LE Periodic Advertising: False
.... .... .... .... .... .... .... .... .... .... .... .... .0.. .... .... .... = Channel Selection Algorithm #2: False
.... .... .... .... .... .... .... .... .... .... .... .... 0... .... .... .... = Power Class 1: False
.... .... .... .... .... .... .... .... .... .... .... ...0 .... .... .... .... = Minimum Number of Used Channels Procedure: False
0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 000. .... .... .... .... = Reserved: 0x000000000000
[Command in frame: 1393]
[Pending in frame: 1398]
[Pending-Response Delta: 54.527ms]
[Command-Response Delta: 57.991ms]

虽然不支持更新参数请求,但是却发了更新参数请求过来,这个现象比较奇怪。

参数更新请求。
2698 15:57:19.440508 TexasIns_f0:d3:41 (Hon-RFID3) localhost () L2CAP 21 Rcvd Connection Parameter Update Request
请求回复。
2702 15:57:19.441762 localhost () TexasIns_f0:d3:41 (Hon-RFID3) L2CAP 15 Sent Connection Parameter Update Response (Accepted)
发送更新过去。
2705 15:57:19.442326 host controller HCI_CMD 18 Sent LE Connection Update
这条命令没有处理,应为没有controller通过hci发给host的命令回复,所以没有处理。就不会存在后面的等待超时。

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