无法理解蓝牙连接

无法理解蓝牙连接

我正在尝试排除与廉价 elm327 OBDII 适配器的连接故障,可以使用 bluetoothctl 将其配对并且我可以信任它,可以使用 rfcomm 建立串行连接,然后我继续使用波特率为 9600 的屏幕,但我很难获取任何数据,并且在提示符下我只能插入两个字符?

我使用 btmon 来捕获我的 bt 连接,但我无法理解它,我看到我可以连接并交换 MTU 速率,据我了解它使用最低速率:

= Note: Bluetooth subsystem version 2.22                                                                                                                                            0.304925
= New Index: 60:F2:62:0B:05:EE (Primary,USB,hci0)                                                                                                                            [hci0] 0.304925
= Open Index: 60:F2:62:0B:05:EE                                                                                                                                              [hci0] 0.304926
= Index Info: 60:F2:62:0B:05:EE (Intel Corp.)                                                                                                                                [hci0] 0.304926
@ MGMT Open: bluetoothd (privileged) version 1.22                                                                                                                          {0x0001} 0.304927
> HCI Event: Extended Inquiry Result (0x2f) plen 255                                                                                                                      #1 [hci0] 1.946471
        Num responses: 1
        Address: 00:10:CC:4F:36:03 (CLP COMPUTER LOGISTIK PLANUNG GmbH)
        Page scan repetition mode: R1 (0x01)
        Page period mode: P0 (0x00)
        Class: 0x000000
          Major class: Miscellaneous
          Minor class: 0x00
        Clock offset: 0x4b8e
        RSSI: -45 dBm (0xd3)
        Name (complete): OBDII
        Company: not assigned (29282)
          Data: 32327878112233445566aabb0000
@ MGMT Event: Device Found (0x0012) plen 45                                                                                                                         {0x0001} [hci0] 1.946526
        BR/EDR Address: 00:10:CC:4F:36:03 (CLP COMPUTER LOGISTIK PLANUNG GmbH)
        RSSI: -45 dBm (0xd3)
        Flags: 0x00000000
        Data length: 31
        Name (complete): OBDII
        Company: not assigned (29282)
          Data: 32327878112233445566aabb0000
        Class: 0x000000
          Major class: Miscellaneous
          Minor class: 0x00
< HCI Command: Inquiry Cancel (0x01|0x0002) plen 0                                                                                                                        #2 [hci0] 3.532687
> HCI Event: Command Complete (0x0e) plen 4                                                                                                                               #3 [hci0] 3.534686
      Inquiry Cancel (0x01|0x0002) ncmd 2
        Status: Success (0x00)
@ MGMT Event: Discovering (0x0013) plen 2                                                                                                                           {0x0001} [hci0] 3.534740
        Address type: 0x01
          BR/EDR
        Discovery: Disabled (0x00)
< HCI Command: Create Connection (0x01|0x0005) plen 13                                                                                                                    #4 [hci0] 3.534748
        Address: 00:10:CC:4F:36:03 (CLP COMPUTER LOGISTIK PLANUNG GmbH)
        Packet type: 0xcc18
          DM1 may be used
          DH1 may be used
          DM3 may be used
          DH3 may be used
          DM5 may be used
          DH5 may be used
        Page scan repetition mode: R2 (0x02)
        Page scan mode: Mandatory (0x00)
        Clock offset: 0x0000
        Role switch: Allow peripheral (0x01)
> HCI Event: Command Status (0x0f) plen 4                                                                                                                                 #5 [hci0] 3.535531
      Create Connection (0x01|0x0005) ncmd 1
        Status: Success (0x00)
> HCI Event: Vendor (0xff) plen 4                                                                                                                                         #6 [hci0] 6.407132
        26 00 01 01                                      &...            
> HCI Event: Connect Complete (0x03) plen 11                                                                                                                              #7 [hci0] 6.407938
        Status: Success (0x00)
        Handle: 256
        Address: 00:10:CC:4F:36:03 (CLP COMPUTER LOGISTIK PLANUNG GmbH)
        Link type: ACL (0x01)
        Encryption: Disabled (0x00)
< HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2                                                                                                        #8 [hci0] 6.408166
        Handle: 256
> HCI Event: Max Slots Change (0x1b) plen 3                                                                                                                               #9 [hci0] 6.408950
        Handle: 256
        Max slots: 5
> HCI Event: Command Status (0x0f) plen 4                                                                                                                                #10 [hci0] 6.409923
      Read Remote Supported Features (0x01|0x001b) ncmd 1
        Status: Success (0x00)
< HCI Command: Write Scan Enable (0x03|0x001a) plen 1                                                                                                                    #11 [hci0] 6.410018
        Scan enable: No Scans (0x00)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                                              #12 [hci0] 6.410968
      Write Scan Enable (0x03|0x001a) ncmd 2
        Status: Success (0x00)
> HCI Event: Read Remote Supported Features (0x0b) plen 11                                                                                                               #13 [hci0] 6.413957
        Status: Success (0x00)
        Handle: 256
        Features: 0xbf 0xfe 0x8d 0xfa 0xc8 0x2d 0x71 0x83
          3 slot packets
          5 slot packets
          Encryption
          Slot offset
          Timing accuracy
          Role switch
          Sniff mode
          Power control requests
          Channel quality driven data rate (CQDDR)
          SCO link
          HV2 packets
          HV3 packets
          u-law log synchronous data
          A-law log synchronous data
          CVSD synchronous data
          Power control
          Transparent synchronous data
          Broadcast Encryption
          Enhanced Data Rate ACL 2 Mbps mode
          Enhanced inquiry scan
          Interlaced inquiry scan
          Interlaced page scan
          RSSI with inquiry results
          Extended SCO link (EV3 packets)
          AFH capable peripheral
          LE Supported (Controller)
          3-slot Enhanced Data Rate ACL packets
          5-slot Enhanced Data Rate ACL packets
          Pause encryption
          AFH capable central
          Enhanced Data Rate eSCO 2 Mbps mode
          Extended Inquiry Response
          Encapsulated PDU
          Erroneous Data Reporting
          Non-flushable Packet Boundary Flag
          Link Supervision Timeout Changed Event
          Inquiry TX Power Level
          Extended features
< HCI Command: Read Remote Extended Features (0x01|0x001c) plen 3                                                                                                        #14 [hci0] 6.414046
        Handle: 256
        Page: 1
> HCI Event: Command Status (0x0f) plen 4                                                                                                                                #15 [hci0] 6.414916
      Read Remote Extended Features (0x01|0x001c) ncmd 1
        Status: Success (0x00)
> HCI Event: Read Remote Extended Features (0x23) plen 13                                                                                                                #16 [hci0] 6.418963
        Status: Success (0x00)
        Handle: 256
        Page: 1/2
        Features: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
< HCI Command: Remote Name Request (0x01|0x0019) plen 10                                                                                                                 #17 [hci0] 6.419074
        Address: 00:10:CC:4F:36:03 (CLP COMPUTER LOGISTIK PLANUNG GmbH)
        Page scan repetition mode: R2 (0x02)
        Page scan mode: Mandatory (0x00)
        Clock offset: 0x0000
< ACL Data TX: Handle 256 flags 0x00 dlen 10                                                                                                                             #18 [hci0] 6.419104
      L2CAP: Information Request (0x0a) ident 1 len 2
        Type: Extended features supported (0x0002)
> HCI Event: Command Status (0x0f) plen 4                                                                                                                                #19 [hci0] 6.419930
      Remote Name Request (0x01|0x0019) ncmd 1
        Status: Success (0x00)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #20 [hci0] 6.425023
        Num handles: 1
        Handle: 256
        Count: 1
> HCI Event: Remote Name Req Complete (0x07) plen 255                                                                                                                    #21 [hci0] 6.430003
        Status: Success (0x00)
        Address: 00:10:CC:4F:36:03 (CLP COMPUTER LOGISTIK PLANUNG GmbH)
        Name: OBDII
@ MGMT Event: Device Connected (0x000b) plen 20                                                                                                                     {0x0001} [hci0] 6.430056
        BR/EDR Address: 00:10:CC:4F:36:03 (CLP COMPUTER LOGISTIK PLANUNG GmbH)
        Flags: 0x00000008
          Connection Locally Initiated
        Data length: 7
        Name (complete): OBDII
> ACL Data RX: Handle 256 flags 0x02 dlen 16                                                                                                                             #22 [hci0] 6.437601
      L2CAP: Information Response (0x0b) ident 1 len 8
        Type: Extended features supported (0x0002)
        Result: Success (0x0000)
        Features: 0x00000000
< ACL Data TX: Handle 256 flags 0x00 dlen 12                                                                                                                             #23 [hci0] 6.437668
      L2CAP: Connection Request (0x02) ident 2 len 4
        PSM: 3 (0x0003)
        Source CID: 64
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #24 [hci0] 6.441004
        Num handles: 1
        Handle: 256
        Count: 1
> ACL Data RX: Handle 256 flags 0x02 dlen 16                                                                                                                             #25 [hci0] 6.453672
      L2CAP: Connection Response (0x03) ident 2 len 8
        Destination CID: 64
        Source CID: 64
        Result: Connection successful (0x0000)
        Status: No further information available (0x0000)
> ACL Data RX: Handle 256 flags 0x02 dlen 16                                                                                                                             #26 [hci0] 6.453675
      L2CAP: Configure Request (0x04) ident 1 len 8
        Destination CID: 64
        Flags: 0x0000
        Option: Maximum Transmission Unit (0x01) [mandatory]
          MTU: 668
< ACL Data TX: Handle 256 flags 0x00 dlen 16                                                                                                                             #27 [hci0] 6.453761
      L2CAP: Configure Request (0x04) ident 3 len 8
        Destination CID: 64
        Flags: 0x0000
        Option: Maximum Transmission Unit (0x01) [mandatory]
          MTU: 1021
< ACL Data TX: Handle 256 flags 0x00 dlen 18                                                                                                                             #28 [hci0] 6.453780
      L2CAP: Configure Response (0x05) ident 1 len 10
        Source CID: 64
        Flags: 0x0000
        Result: Success (0x0000)
        Option: Maximum Transmission Unit (0x01) [mandatory]
          MTU: 668
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #29 [hci0] 6.459103
        Num handles: 1
        Handle: 256
        Count: 1
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #30 [hci0] 6.459979
        Num handles: 1
        Handle: 256
        Count: 1
> ACL Data RX: Handle 256 flags 0x02 dlen 18                                                                                                                             #31 [hci0] 6.465671
      L2CAP: Configure Response (0x05) ident 3 len 10
        Source CID: 64
        Flags: 0x0000
        Result: Success (0x0000)
        Option: Maximum Transmission Unit (0x01) [mandatory]
          MTU: 1021
< ACL Data TX: Handle 256 flags 0x00 dlen 8                                                                                                                              #32 [hci0] 6.465833
      Channel: 64 len 4 [PSM 3 mode Basic (0x00)] {chan 0}
      RFCOMM: Set Async Balance Mode (SABM) (0x2f)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0x3f poll/final 1
         Length: 0
         FCS: 0x1c
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #33 [hci0] 6.474195
        Num handles: 1
        Handle: 256
        Count: 1
> ACL Data RX: Handle 256 flags 0x02 dlen 8                                                                                                                              #34 [hci0] 6.481715
      Channel: 64 len 4 [PSM 3 mode Basic (0x00)] {chan 0}
      RFCOMM: Unnumbered Ack (UA) (0x63)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0x73 poll/final 1
         Length: 0
         FCS: 0xd7
< ACL Data TX: Handle 256 flags 0x00 dlen 18                                                                                                                             #35 [hci0] 6.481922
      Channel: 64 len 14 [PSM 3 mode Basic (0x00)] {chan 0}
      RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0xef poll/final 0
         Length: 10
         FCS: 0x70
         MCC Message type: DLC Parameter Negotiation CMD (0x20)
...skipping...
        Source CID: 64
        Flags: 0x0000
        Result: Success (0x0000)
        Option: Maximum Transmission Unit (0x01) [mandatory]
          MTU: 668
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #29 [hci0] 6.459103
        Num handles: 1
        Handle: 256
        Count: 1
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #30 [hci0] 6.459979
        Num handles: 1
        Handle: 256
        Count: 1
> ACL Data RX: Handle 256 flags 0x02 dlen 18                                                                                                                             #31 [hci0] 6.465671
      L2CAP: Configure Response (0x05) ident 3 len 10
        Source CID: 64
        Flags: 0x0000
        Result: Success (0x0000)
        Option: Maximum Transmission Unit (0x01) [mandatory]
          MTU: 1021
< ACL Data TX: Handle 256 flags 0x00 dlen 8                                                                                                                              #32 [hci0] 6.465833
      Channel: 64 len 4 [PSM 3 mode Basic (0x00)] {chan 0}
      RFCOMM: Set Async Balance Mode (SABM) (0x2f)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0x3f poll/final 1
         Length: 0
         FCS: 0x1c
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #33 [hci0] 6.474195
        Num handles: 1
        Handle: 256
        Count: 1
> ACL Data RX: Handle 256 flags 0x02 dlen 8                                                                                                                              #34 [hci0] 6.481715
      Channel: 64 len 4 [PSM 3 mode Basic (0x00)] {chan 0}
      RFCOMM: Unnumbered Ack (UA) (0x63)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0x73 poll/final 1
         Length: 0
         Length: 0
         FCS: 0xd7
< ACL Data TX: Handle 256 flags 0x00 dlen 18                                                                                                                             #35 [hci0] 6.481922
      Channel: 64 len 14 [PSM 3 mode Basic (0x00)] {chan 0}
      RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0xef poll/final 0
         Length: 10
         FCS: 0x70
         MCC Message type: DLC Parameter Negotiation CMD (0x20)
           Length: 8
           dlci 4 frame_type 0 credit_flow 15 pri 7
           ack_timer 0 frame_size 663 max_retrans 0 credits 7
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #36 [hci0] 6.484969
        Num handles: 1
           dlci 4 frame_type 0 credit_flow 15 pri 7
           ack_timer 0 frame_size 663 max_retrans 0 credits 7
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #36 [hci0] 6.484969
        Num handles: 1
        Handle: 256
        Count: 1
> ACL Data RX: Handle 256 flags 0x02 dlen 18                                                                                                                             #37 [hci0] 6.493479
      Channel: 64 len 14 [PSM 3 mode Basic (0x00)] {chan 0}
      RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
         Address: 0x01 cr 0 dlci 0x00
         Control: 0xef poll/final 0
         Length: 10
         FCS: 0xaa
         MCC Message type: DLC Parameter Negotiation RSP (0x20)
           Length: 8
           dlci 4 frame_type 0 credit_flow 14 pri 7
           ack_timer 0 frame_size 662 max_retrans 0 credits 0
< ACL Data TX: Handle 256 flags 0x00 dlen 8                                                                                                                              #38 [hci0] 6.493701
      Channel: 64 len 4 [PSM 3 mode Basic (0x00)] {chan 0}
      RFCOMM: Set Async Balance Mode (SABM) (0x2f)
         Address: 0x13 cr 1 dlci 0x04
         Control: 0x3f poll/final 1
         Length: 0
         FCS: 0x96
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #39 [hci0] 6.498304
        Num handles: 1
        Handle: 256
        Count: 1
> ACL Data RX: Handle 256 flags 0x02 dlen 8                                                                                                                              #40 [hci0] 6.498359
      Channel: 64 len 4 [PSM 3 mode Basic (0x00)] {chan 0}
      RFCOMM: Unnumbered Ack (UA) (0x63)
         Address: 0x13 cr 1 dlci 0x04
         Control: 0x73 poll/final 1
         Length: 0
         FCS: 0x5d
< ACL Data TX: Handle 256 flags 0x00 dlen 12                                                                                                                             #41 [hci0] 6.498649
      Channel: 64 len 8 [PSM 3 mode Basic (0x00)] {chan 0}
      RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0xef poll/final 0
         Length: 4
         FCS: 0x70
         MCC Message type: Modem Status Command CMD (0x38)
           Length: 2
           dlci 4 
           fc 0 rtc 1 rtr 1 ic 0 dv 1

我看到了“RFCOMM:未编号确认(UA)(0x63)”,我不确定它是什么意思,而且似乎从那时起连接就出现了一些问题,“RFCOMM:带有标头检查的未编号信息(UIH)”是我发现的另一个问题,但不确定它是什么。

我错过了什么?

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