RFCOMM not working anymore?

Mariusz Białończyk <manio@xxxxxxxxxx> · Thu, 8 Feb 2024 15:45:05 +0100

Hi,
I am trying to use an RFCOMM-capable dongle under Arch Linux (kernel: 6.6.10-arch1-1).
The BT usb adapter is:
ID 0bda:8771 Realtek Semiconductor Corp. Bluetooth Radio

dmesg:
[   19.174428] Bluetooth: Core ver 2.22
[   19.174448] NET: Registered PF_BLUETOOTH protocol family
[   19.174448] Bluetooth: HCI device and connection manager initialized
[   19.174452] Bluetooth: HCI socket layer initialized
[   19.174454] Bluetooth: L2CAP socket layer initialized
[   19.174460] Bluetooth: SCO socket layer initialized
[   20.497753] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761
[   20.500891] Bluetooth: hci0: RTL: rom_version status=0 version=1
[   20.500894] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_fw.bin
[   20.502433] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_config.bin
[   20.503140] Bluetooth: hci0: RTL: cfg_sz 6, total sz 30210
[   20.898620] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   20.898620] Bluetooth: BNEP filters: protocol multicast
[   20.898620] Bluetooth: BNEP socket layer initialized
[   21.285074] Bluetooth: hci0: RTL: fw version 0xdfc6d922
[   21.430191] Bluetooth: MGMT ver 1.22
[   40.360736] Bluetooth: RFCOMM TTY layer initialized
[   40.360743] Bluetooth: RFCOMM socket layer initialized
[   40.360746] Bluetooth: RFCOMM ver 1.11

The rfcomm utility was not provided so I had to install:
https://archlinux.org/packages/extra/x86_64/bluez-deprecated-tools/

unfortunately the command:
rfcomm connect 0 B8:8B:15:0A:1C:AD
gives:
Can't connect RFCOMM socket: Operation now in progress

I tried also with bind - all of this gives errors.
Finally I tried python tools to directly use RFCOMM, then even a rust
rfcat tool from:
https://github.com/bluez/bluer/blob/master/bluer-tools/src/rfcat.rs
All gives various errors/timeouts and cannot connect to the dongle's
serial port. I was also trying to pair/connect with bluetoothctl prior
this - no change.
In fact (see below - pairing seems not needed at all).

Finally I started very very old Asus laptop with debian.
I invoked:
rfcomm connect 0 B8:8B:15:0A:1C:AD
and this immediately gives me:
Connected /dev/rfcomm0 to B8:8B:15:0A:1C:AD on channel 1
Press CTRL-C for hangup

... and it works like a charm!!! I can connect minicom and communication is
working (no pairing/connecting with bluetoothctl needed).

dmesg there:
[  298.641307] Bluetooth: Core ver 2.22
[  298.641393] Bluetooth: HCI device and connection manager initialized
[  298.641405] Bluetooth: HCI socket layer initialized
[  298.641409] Bluetooth: L2CAP socket layer initialized
[  298.641419] Bluetooth: SCO socket layer initialized
[  299.673331] Bluetooth: hci0: unexpected event for opcode 0x0000
[  311.510413] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[  311.510422] Bluetooth: BNEP filters: protocol multicast
[  311.510435] Bluetooth: BNEP socket layer initialized
[ 1902.017008] Bluetooth: RFCOMM TTY layer initialized
[ 1902.017026] Bluetooth: RFCOMM socket layer initialized
[ 1902.017048] Bluetooth: RFCOMM ver 1.11

the adapter is:
ID 0b05:1712 ASUSTek Computer, Inc. BT-183 Bluetooth 2.0+EDR adapter

I am now trying to identify the problem. I've logged all data using
btmon from the start to invoking the rfcom connect.

I can see that the difference start when my Asus laptop is showing this:
< ACL Data TX: Handle 42 flags 0x02 dlen 10                                                                        #13 [hci0] 40.891571
      L2CAP: Information Request (0x0a) ident 1 len 2
        Type: Extended features supported (0x0002)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                             #14 [hci0] 40.898476
        Num handles: 1
        Handle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)
        Count: 1
> ACL Data RX: Handle 42 flags 0x02 dlen 16                                                                        #15 [hci0] 40.899488
      L2CAP: Information Response (0x0b) ident 1 len 8
        Type: Extended features supported (0x0002)
        Result: Success (0x0000)
        Features: 0x00000000
< ACL Data TX: Handle 42 flags 0x02 dlen 12                                                                        #16 [hci0] 40.899554
      L2CAP: Connection Request (0x02) ident 2 len 4
        PSM: 3 (0x0003)
        Source CID: 64

I don't see any L2CAP and RFCOMM lines on the "bad" ArchLinux setup.

Please help! I really like to connect to this dongle (even no matter
which software involved - I just want to access this serialport somehow).

I am attaching full logs (called good and bad). dvbsnoop logs also
included.

ps. I tested the dongle also from Windows and Android - also works OK.

-- 
regards,
Mariusz Białończyk
https://skyboo.net | https://github.com/manio
Attachment:
bad_btsnoop.log

Description: Binary data
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[1m[7m#[27m[1m[0m                                                                                                                                                                                     

[0m[27m[24m[J
[1;31mroot[0m in [1;36m/dev/shm[0m 
[1;32m❯[0m [K[?2004hbbtmon[1m [0m[0m -w ./log

[A[A[0m[27m[24m[J
[1;31mroot[0m in [1;36m/dev/shm[0m 
[1;32m❯[0m btmon -w ./log

[A[A[0m[27m[24m[J
[1;31mroot[0m in [1;36m/dev/shm[0m 
[1;32m❯[0m btmon -w ./log[?2004l

Bluetooth monitor ver 5.71
[0mbtmon[2269455]: = Note: Linux version 6.6.10-arch1-1 (x86_64)[0m                                                                 [0;33m[0;33m 0.884325[0m
[0mbtmon[2269455]: = Note: Bluetooth subsystem version 2.22[0m                                                                      [0;33m[0;33m 0.884327[0m
[0;32m= New Index: 8C:88:2B:12:47:8A[0m (Primary,USB,hci0)                                                                      [0;33m[0;37m [hci0][0;33m 0.884329[0m
[0;32m= Open Index: 8C:88:2B:12:47:8A[0m                                                                                        [0;33m[0;37m [hci0][0;33m 0.884330[0m
[0;32m= Index Info: 8C:88:2B:12:47:8A[0m (Realtek Semiconductor Corporation)                                                    [0;33m[0;37m [hci0][0;33m 0.884332[0m
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[1;32mbtmon[2269455]: @ RAW Open: btmon[0m (privileged) version 2.22                                                         [0;33m[0;37m {0x0002}[0;33m 24.861029[0m
[1;31mbtmon[2269455]: @ RAW Close: btmon[0m                                                                                  [0;33m[0;37m {0x0002}[0;33m 24.861032[0m
[0;35m> HCI Event: Max Slots Change[0m (0x1b) plen 3                                                                        [0;33m[0;37m #5[0;37m [hci0][0;33m 24.861582[0m
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[0;35m> HCI Event: Command Status[0m (0x0f) plen 4                                                                         [0;33m[0;37m #15[0;37m [hci0][0;33m 24.924601[0m
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        [0m[0mAuthentication: No Bonding - MITM not required (0x00)[0m
[0;35m> HCI Event: Command Complete[0m (0x0e) plen 10                                                                      [0;33m[0;37m #21[0;37m [hci0][0;33m 24.932593[0m
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[0;35m> HCI Event: IO Capability Response[0m (0x32) plen 9                                                                 [0;33m[0;37m #22[0;37m [hci0][0;33m 24.961594[0m
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[0;35m> HCI Event: User Confirmation Request[0m (0x33) plen 10                                                             [0;33m[0;37m #23[0;37m [hci0][0;33m 25.379644[0m
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[0;34m< HCI Command: User Confirmation Request Reply[0m (0x01|0x002c) plen 6                                               [0;33m[0;37m #24[0;37m [hci0][0;33m 25.379668[0m
        [0m[0mAddress: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
[0;35m> HCI Event: Command Complete[0m (0x0e) plen 10                                                                      [0;33m[0;37m #25[0;37m [hci0][0;33m 25.622674[0m
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[0;35m> HCI Event: Simple Pairing Complete[0m (0x36) plen 7                                                                [0;33m[0;37m #26[0;37m [hci0][0;33m 26.589786[0m
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[0;35m> HCI Event: Auth Complete[0m (0x06) plen 3                                                                          [0;33m[0;37m #27[0;37m [hci0][0;33m 56.710325[0m
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[1;35m@ MGMT Event: Authentication Failed[0m (0x0011) plen 8                                                          [0;33m[0;37m {0x0001}[0;37m [hci0][0;33m 56.710352[0m
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[0;34m< HCI Command: Disconnect[0m (0x01|0x0006) plen 3                                                                    [0;33m[0;37m #28[0;37m [hci0][0;33m 56.743032[0m
        [0m[0mHandle: 2 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mReason: [0;31mRemote User Terminated Connection[0m (0x13)[0m
[0;35m> HCI Event: Command Status[0m (0x0f) plen 4                                                                         [0;33m[0;37m #29[0;37m [hci0][0;33m 56.745340[0m
      [0;34mDisconnect[0m (0x01|0x0006) ncmd 2[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
[0;35m> HCI Event: Disconnect Complete[0m (0x05) plen 4                                                                    [0;33m[0;37m #30[0;37m [hci0][0;33m 56.818364[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
        [0m[0mHandle: 2 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mReason: [0;31mConnection Terminated By Local Host[0m (0x16)[0m
[1;35m@ MGMT Event: Device Disconnected[0m (0x000c) plen 8                                                            [0;33m[0;37m {0x0001}[0;37m [hci0][0;33m 56.818410[0m
        [0m[0mBR/EDR Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mReason: Connection terminated by local host (0x02)[0m
^C[1m[7m#[27m[1m[0m                                                                                                                                       

[0m[27m[24m[J
[1;31mroot[0m in [1;36m/dev/shm[0m took [1;33m1m15s[0m 
[1;32m❯[0m [K[?2004h[?2004l

Script done on 2024-02-08 12:57:13+01:00 [COMMAND_EXIT_CODE="0"]
Attachment:
good_btsnoop.log

Description: Binary data
Script started on 2024-02-08 13:08:24+01:00 [TERM="xterm-256color" TTY="/dev/pts/0" COLUMNS="136" LINES="58"]
[?2004hcyrus:/dev/shm# 
(reverse-i-search)`': b': rfcomm un[7mb[27mind 0 B8:8B:15:0A:1C:AD[8Pt': [7mbt[27mmon -w ./log > log.txt[1@m': [7mbtm[27m[1@o': [7mbtmo[27m
[10Pcyrus:/dev/shm# btmo[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[K[K[K[K
[?2004l
Bluetooth monitor ver 5.66
[0m= Note: Linux version 5.10.0-8-686-pae (i686)[0m                                                                                 [0;33m[0;33m 0.559085[0m
[0m= Note: Bluetooth subsystem version 2.22[0m                                                                                      [0;33m[0;33m 0.559095[0m
[0;32m= New Index: 00:1A:92:C7:CE:51[0m (Primary,USB,hci0)                                                                      [0;33m[0;37m [hci0][0;33m 0.559100[0m
[0;32m= Open Index: 00:1A:92:C7:CE:51[0m                                                                                        [0;33m[0;37m [hci0][0;33m 0.559104[0m
[0;32m= Index Info: 00:1A:92:C7:CE:51[0m (Cambridge Silicon Radio)                                                              [0;33m[0;37m [hci0][0;33m 0.559107[0m
[1;32m@ MGMT Open: bluetoothd[0m (privileged) version 1.18                                                                    [0;33m[0;37m {0x0001}[0;33m 0.559113[0m
[0;34m< HCI Command: Create Connection[0m (0x01|0x0005) plen 13                                                             [0;33m[0;37m #1[0;37m [hci0][0;33m 40.522815[0m
        [0m[0mAddress: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mPacket type: 0xcc18[0m
        [0m[0m  DM1 may be used[0m
        [0m[0m  DH1 may be used[0m
        [0m[0m  DM3 may be used[0m
        [0m[0m  DH3 may be used[0m
        [0m[0m  DM5 may be used[0m
        [0m[0m  DH5 may be used[0m
        [0m[0mPage scan repetition mode: R2 (0x02)[0m
        [0m[0mPage scan mode: Mandatory (0x00)[0m
        [0m[0mClock offset: 0x0000[0m
        [0m[0mRole switch: Allow peripheral (0x01)[0m
[0;35m> HCI Event: Command Status[0m (0x0f) plen 4                                                                          [0;33m[0;37m #2[0;37m [hci0][0;33m 40.532478[0m
      [0;34mCreate Connection[0m (0x01|0x0005) ncmd 1[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
[0;35m> HCI Event: Connect Complete[0m (0x03) plen 11                                                                       [0;33m[0;37m #3[0;37m [hci0][0;33m 40.840478[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
        [0m[0mHandle: 42[0m
        [0m[0mAddress: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mLink type: ACL (0x01)[0m
        [0m[0mEncryption: Disabled (0x00)[0m
[0;34m< HCI Command: Read Remote Supported Features[0m (0x01|0x001b) plen 2                                                 [0;33m[0;37m #4[0;37m [hci0][0;33m 40.840690[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
[1;32m@ RAW Open: btmon[0m (privileged) version 2.22                                                                         [0;33m[0;37m {0x0002}[0;33m 40.841050[0m
[1;31m@ RAW Close: btmon[0m                                                                                                  [0;33m[0;37m {0x0002}[0;33m 40.841067[0m
[0;35m> HCI Event: Command Status[0m (0x0f) plen 4                                                                          [0;33m[0;37m #5[0;37m [hci0][0;33m 40.857466[0m
      [0;34mRead Remote Supported Features[0m (0x01|0x001b) ncmd 0[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
[0;35m> HCI Event: Max Slots Change[0m (0x1b) plen 3                                                                        [0;33m[0;37m #6[0;37m [hci0][0;33m 40.859464[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mMax slots: 5[0m
[0;35m> HCI Event: Command Status[0m (0x0f) plen 4                                                                          [0;33m[0;37m #7[0;37m [hci0][0;33m 40.864464[0m
      [0;34mNOP[0m (0x00|0x0000) ncmd 1[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
[0;35m> HCI Event: Read Remote Supported Features[0m (0x0b) plen 11                                                         [0;33m[0;37m #8[0;37m [hci0][0;33m 40.879478[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mFeatures: 0xbf 0x02 0x00 0x70 0x18 0x1c 0x79 0x83[0m
        [0m[0m  3 slot packets[0m
        [0m[0m  5 slot packets[0m
        [0m[0m  Encryption[0m
        [0m[0m  Slot offset[0m
        [0m[0m  Timing accuracy[0m
        [0m[0m  Role switch[0m
        [0m[0m  Sniff mode[0m
        [0m[0m  Power control requests[0m
        [0m[0m  Interlaced inquiry scan[0m
        [0m[0m  Interlaced page scan[0m
        [0m[0m  RSSI with inquiry results[0m
        [0m[0m  AFH capable peripheral[0m
        [0m[0m  AFH classification peripheral[0m
        [0m[0m  Pause encryption[0m
        [0m[0m  AFH capable central[0m
        [0m[0m  AFH classification central[0m
        [0m[0m  Extended Inquiry Response[0m
        [0m[0m  Secure Simple Pairing[0m
        [0m[0m  Encapsulated PDU[0m
        [0m[0m  Erroneous Data Reporting[0m
        [0m[0m  Non-flushable Packet Boundary Flag[0m
        [0m[0m  Link Supervision Timeout Changed Event[0m
        [0m[0m  Inquiry TX Power Level[0m
        [0m[0m  Extended features[0m
[0;34m< HCI Command: Read Remote Extended Features[0m (0x01|0x001c) plen 3                                                  [0;33m[0;37m #9[0;37m [hci0][0;33m 40.879547[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mPage: 1[0m
[0;35m> HCI Event: Command Status[0m (0x0f) plen 4                                                                         [0;33m[0;37m #10[0;37m [hci0][0;33m 40.886476[0m
      [0;34mRead Remote Extended Features[0m (0x01|0x001c) ncmd 1[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
[0;35m> HCI Event: Read Remote Extended Features[0m (0x23) plen 13                                                         [0;33m[0;37m #11[0;37m [hci0][0;33m 40.891477[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mPage: 1/1[0m
        [0m[0mFeatures: 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00[0m
        [0m[0m  Secure Simple Pairing (Host Support)[0m
[0;34m< HCI Command: Remote Name Request[0m (0x01|0x0019) plen 10                                                          [0;33m[0;37m #12[0;37m [hci0][0;33m 40.891552[0m
        [0m[0mAddress: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mPage scan repetition mode: R2 (0x02)[0m
        [0m[0mPage scan mode: Mandatory (0x00)[0m
        [0m[0mClock offset: 0x0000[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 10                                                                       [0;33m[0;37m #13[0;37m [hci0][0;33m 40.891571[0m
      [0;34mL2CAP: Information Request[0m (0x0a) ident 1 len 2[0m
        [0m[0mType: Extended features supported (0x0002)[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #14[0;37m [hci0][0;33m 40.898476[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 16                                                                       [0;33m[0;37m #15[0;37m [hci0][0;33m 40.899488[0m
      [0;35mL2CAP: Information Response[0m (0x0b) ident 1 len 8[0m
        [0m[0mType: Extended features supported (0x0002)[0m
        [0m[0mResult: Success (0x0000)[0m
        [0m[0mFeatures: 0x00000000[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 12                                                                       [0;33m[0;37m #16[0;37m [hci0][0;33m 40.899554[0m
      [0;34mL2CAP: Connection Request[0m (0x02) ident 2 len 4[0m
        [0m[0mPSM: 3 (0x0003)[0m
        [0m[0mSource CID: 64[0m
[0;35m> HCI Event: Command Status[0m (0x0f) plen 4                                                                         [0;33m[0;37m #17[0;37m [hci0][0;33m 40.904476[0m
      [0;34mRemote Name Request[0m (0x01|0x0019) ncmd 1[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 16                                                                       [0;33m[0;37m #18[0;37m [hci0][0;33m 40.905481[0m
      [0;35mL2CAP: Connection Response[0m (0x03) ident 2 len 8[0m
        [0m[0mDestination CID: 71[0m
        [0m[0mSource CID: 64[0m
        [0m[0mResult: Connection pending (0x0001)[0m
        [0m[0mStatus: Authorization pending (0x0002)[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #19[0;37m [hci0][0;33m 40.906462[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 16                                                                       [0;33m[0;37m #20[0;37m [hci0][0;33m 40.929484[0m
      [0;35mL2CAP: Connection Response[0m (0x03) ident 2 len 8[0m
        [0m[0mDestination CID: 71[0m
        [0m[0mSource CID: 64[0m
        [0m[0mResult: Connection successful (0x0000)[0m
        [0m[0mStatus: No further information available (0x0000)[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 16                                                                       [0;33m[0;37m #21[0;37m [hci0][0;33m 40.929560[0m
      [0;34mL2CAP: Configure Request[0m (0x04) ident 3 len 8[0m
        [0m[0mDestination CID: 71[0m
        [0m[0mFlags: 0x0000[0m
        [0m[0mOption: Maximum Transmission Unit (0x01) [mandatory][0m
        [0m[0m  MTU: 1021[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 16                                                                       [0;33m[0;37m #22[0;37m [hci0][0;33m 40.932479[0m
      [0;35mL2CAP: Configure Request[0m (0x04) ident 13 len 8[0m
        [0m[0mDestination CID: 64[0m
        [0m[0mFlags: 0x0000[0m
        [0m[0mOption: Maximum Transmission Unit (0x01) [mandatory][0m
        [0m[0m  MTU: 128[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 18                                                                       [0;33m[0;37m #23[0;37m [hci0][0;33m 40.932539[0m
      [0;34mL2CAP: Configure Response[0m (0x05) ident 13 len 10[0m
        [0m[0mSource CID: 71[0m
        [0m[0mFlags: 0x0000[0m
        [0m[0mResult: Success (0x0000)[0m
        [0m[0mOption: Maximum Transmission Unit (0x01) [mandatory][0m
        [0m[0m  MTU: 128[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 14                                                                       [0;33m[0;37m #24[0;37m [hci0][0;33m 40.940478[0m
      [0;35mL2CAP: Configure Response[0m (0x05) ident 3 len 6[0m
        [0m[0mSource CID: 64[0m
        [0m[0mFlags: 0x0000[0m
        [0m[0mResult: Success (0x0000)[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 8                                                                        [0;33m[0;37m #25[0;37m [hci0][0;33m 40.940587[0m
      [0;36mChannel:[0m 71 len 4 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;34mRFCOMM: Set Async Balance Mode (SABM)[0m (0x2f)[0m
        [0m[0m Address: 0x03 cr 1 dlci 0x00[0m
        [0m[0m Control: 0x3f poll/final 1[0m
        [0m[0m Length: 0[0m
        [0m[0m FCS: 0x1c[0m
[0;35m> HCI Event: Remote Name Req Complete[0m (0x07) plen 255                                                             [0;33m[0;37m #26[0;37m [hci0][0;33m 40.947472[0m
        [0m[0mStatus: [0;32mSuccess[0m (0x00)[0m
        [0m[0mAddress: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mName: KONNWEI[0m
[1;35m@ MGMT Event: Device Connected[0m (0x000b) plen 27                                                              [0;33m[0;37m {0x0001}[0;37m [hci0][0;33m 40.947524[0m
        [0m[0mBR/EDR Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mFlags: 0x00000000[0m
        [0m[0mData length: 14[0m
        [0m[0mName (complete): KONNWEI[0m
        [0m[0mClass: 0x040424[0m
        [0m[0m  Major class: Audio/Video (headset, speaker, stereo, video, vcr)[0m
        [0m[0m  Minor class: Set-top box[0m
        [0m[0m  Rendering (Printing, Speaker)[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 8                                                                        [0;33m[0;37m #27[0;37m [hci0][0;33m 40.948468[0m
      [0;36mChannel:[0m 64 len 4 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;35mRFCOMM: Unnumbered Ack (UA)[0m (0x63)[0m
        [0m[0m Address: 0x03 cr 1 dlci 0x00[0m
        [0m[0m Control: 0x73 poll/final 1[0m
        [0m[0m Length: 0[0m
        [0m[0m FCS: 0xd7[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 18                                                                       [0;33m[0;37m #28[0;37m [hci0][0;33m 40.948566[0m
      [0;36mChannel:[0m 71 len 14 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;34mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x03 cr 1 dlci 0x00[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 10[0m
        [0m[0m FCS: 0x70[0m
        [0m[0m MCC Message type: DLC Parameter Negotiation CMD (0x20)[0m
        [0m[0m   Length: 8[0m
        [0m[0m   dlci 2 frame_type 0 credit_flow 15 pri 7[0m
        [0m[0m   ack_timer 0 frame_size 123 max_retrans 0 credits 7[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #29[0;37m [hci0][0;33m 40.949469[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #30[0;37m [hci0][0;33m 40.951463[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #31[0;37m [hci0][0;33m 40.953476[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #32[0;37m [hci0][0;33m 40.956477[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 18                                                                       [0;33m[0;37m #33[0;37m [hci0][0;33m 40.957482[0m
      [0;36mChannel:[0m 64 len 14 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;35mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x01 cr 0 dlci 0x00[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 10[0m
        [0m[0m FCS: 0xaa[0m
        [0m[0m MCC Message type: DLC Parameter Negotiation RSP (0x20)[0m
        [0m[0m   Length: 8[0m
        [0m[0m   dlci 2 frame_type 0 credit_flow 14 pri 7[0m
        [0m[0m   ack_timer 0 frame_size 123 max_retrans 0 credits 4[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 8                                                                        [0;33m[0;37m #34[0;37m [hci0][0;33m 40.957579[0m
      [0;36mChannel:[0m 71 len 4 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;34mRFCOMM: Set Async Balance Mode (SABM)[0m (0x2f)[0m
        [0m[0m Address: 0x0b cr 1 dlci 0x02[0m
        [0m[0m Control: 0x3f poll/final 1[0m
        [0m[0m Length: 0[0m
        [0m[0m FCS: 0x59[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #35[0;37m [hci0][0;33m 40.963476[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 8                                                                        [0;33m[0;37m #36[0;37m [hci0][0;33m 40.964481[0m
      [0;36mChannel:[0m 64 len 4 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;35mRFCOMM: Unnumbered Ack (UA)[0m (0x63)[0m
        [0m[0m Address: 0x0b cr 1 dlci 0x02[0m
        [0m[0m Control: 0x73 poll/final 1[0m
        [0m[0m Length: 0[0m
        [0m[0m FCS: 0x92[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 12                                                                       [0;33m[0;37m #37[0;37m [hci0][0;33m 40.964761[0m
      [0;36mChannel:[0m 71 len 8 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;34mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x03 cr 1 dlci 0x00[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 4[0m
        [0m[0m FCS: 0x70[0m
        [0m[0m MCC Message type: Modem Status Command CMD (0x38)[0m
        [0m[0m   Length: 2[0m
        [0m[0m   dlci 2 [0m
        [0m[0m   fc 0 rtc 1 rtr 1 ic 0 dv 1[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 12                                                                       [0;33m[0;37m #38[0;37m [hci0][0;33m 40.967465[0m
      [0;36mChannel:[0m 64 len 8 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;35mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x01 cr 0 dlci 0x00[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 4[0m
        [0m[0m FCS: 0xaa[0m
        [0m[0m MCC Message type: Modem Status Command CMD (0x38)[0m
        [0m[0m   Length: 2[0m
        [0m[0m   dlci 2 [0m
        [0m[0m   fc 0 rtc 1 rtr 1 ic 0 dv 1[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 12                                                                       [0;33m[0;37m #39[0;37m [hci0][0;33m 40.967542[0m
      [0;36mChannel:[0m 71 len 8 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;34mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x03 cr 1 dlci 0x00[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 4[0m
        [0m[0m FCS: 0x70[0m
        [0m[0m MCC Message type: Modem Status Command RSP (0x38)[0m
        [0m[0m   Length: 2[0m
        [0m[0m   dlci 2 [0m
        [0m[0m   fc 0 rtc 1 rtr 1 ic 0 dv 1[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #40[0;37m [hci0][0;33m 40.972462[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 12                                                                       [0;33m[0;37m #41[0;37m [hci0][0;33m 40.974484[0m
      [0;36mChannel:[0m 64 len 8 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;35mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x01 cr 0 dlci 0x00[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 4[0m
        [0m[0m FCS: 0xaa[0m
        [0m[0m MCC Message type: Modem Status Command RSP (0x38)[0m
        [0m[0m   Length: 2[0m
        [0m[0m   dlci 2 [0m
        [0m[0m   fc 0 rtc 1 rtr 1 ic 0 dv 1[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 9                                                                        [0;33m[0;37m #42[0;37m [hci0][0;33m 40.974590[0m
      [0;36mChannel:[0m 71 len 5 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;34mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x0b cr 1 dlci 0x02[0m
        [0m[0m Control: 0xff poll/final 1[0m
        [0m[0m Length: 0[0m
        [0m[0m FCS: 0x86[0m
        [0m[0m Credits: 33[0m
        [0m[0;37m86                                               .               [0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #43[0;37m [hci0][0;33m 40.976460[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #44[0;37m [hci0][0;33m 40.981477[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 18                                                                       [0;33m[0;37m #45[0;37m [hci0][0;33m 57.978492[0m
      [0;36mChannel:[0m 71 len 14 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;34mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x03 cr 1 dlci 0x00[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 10[0m
        [0m[0m FCS: 0x70[0m
        [0m[0m MCC Message type: Remote Port Negotiation Command CMD (0x24)[0m
        [0m[0m   Length: 8[0m
        [0m[0m   dlci 2[0m
        [0m[0m   br 7 db 3 sb 0 p 0 pt 0 xi 0 xo 0[0m
        [0m[0m   rtri 0 rtro 0 rtci 0 rtco 0 xon 17 xoff 19[0m
        [0m[0m   pm 0x0001[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 12                                                                       [0;33m[0;37m #46[0;37m [hci0][0;33m 57.978615[0m
      [0;36mChannel:[0m 71 len 8 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;34mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x03 cr 1 dlci 0x00[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 4[0m
        [0m[0m FCS: 0x70[0m
        [0m[0m MCC Message type: Modem Status Command CMD (0x38)[0m
        [0m[0m   Length: 2[0m
        [0m[0m   dlci 2 [0m
        [0m[0m   fc 0 rtc 1 rtr 1 ic 0 dv 1[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #47[0;37m [hci0][0;33m 58.001426[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #48[0;37m [hci0][0;33m 58.005416[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 18                                                                       [0;33m[0;37m #49[0;37m [hci0][0;33m 58.005445[0m
      [0;36mChannel:[0m 64 len 14 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;35mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x01 cr 0 dlci 0x00[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 10[0m
        [0m[0m FCS: 0xaa[0m
        [0m[0m MCC Message type: Remote Port Negotiation Command RSP (0x24)[0m
        [0m[0m   Length: 8[0m
        [0m[0m   dlci 2[0m
        [0m[0m   br 7 db 3 sb 0 p 0 pt 0 xi 0 xo 0[0m
        [0m[0m   rtri 0 rtro 0 rtci 0 rtco 0 xon 17 xoff 19[0m
        [0m[0m   pm 0x0001[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 12                                                                       [0;33m[0;37m #50[0;37m [hci0][0;33m 58.007419[0m
      [0;36mChannel:[0m 64 len 8 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;35mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x01 cr 0 dlci 0x00[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 4[0m
        [0m[0m FCS: 0xaa[0m
        [0m[0m MCC Message type: Modem Status Command RSP (0x38)[0m
        [0m[0m   Length: 2[0m
        [0m[0m   dlci 2 [0m
        [0m[0m   fc 0 rtc 1 rtr 1 ic 0 dv 1[0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 9                                                                        [0;33m[0;37m #51[0;37m [hci0][0;33m 61.065068[0m
      [0;36mChannel:[0m 71 len 5 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;34mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x0b cr 1 dlci 0x02[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 1[0m
        [0m[0m FCS: 0x9a[0m
        [0m[0;37m41 9a                                            A.              [0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #52[0;37m [hci0][0;33m 61.074400[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 10                                                                       [0;33m[0;37m #53[0;37m [hci0][0;33m 61.114410[0m
      [0;36mChannel:[0m 64 len 6 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;35mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x09 cr 0 dlci 0x02[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 1[0m
        [0m[0m FCS: 0x40[0m
        [0m[0;37m41 40                                            A@              [0m
[0;36m< ACL Data TX: Handle 42[0m flags 0x02 dlen 9                                                                        [0;33m[0;37m #54[0;37m [hci0][0;33m 61.471610[0m
      [0;36mChannel:[0m 71 len 5 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;34mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x0b cr 1 dlci 0x02[0m
        [0m[0m Control: 0xef poll/final 0[0m
        [0m[0m Length: 1[0m
        [0m[0m FCS: 0x9a[0m
        [0m[0;37m54 9a                                            T.              [0m
[0;35m> HCI Event: Number of Completed Packets[0m (0x13) plen 5                                                            [0;33m[0;37m #55[0;37m [hci0][0;33m 61.481399[0m
        [0m[0mNum handles: 1[0m
        [0m[0mHandle: 42 Address: B8:8B:15:0A:1C:AD (OUI B8-8B-15)[0m
        [0m[0mCount: 1[0m
[0;36m> ACL Data RX: Handle 42[0m flags 0x02 dlen 10                                                                       [0;33m[0;37m #56[0;37m [hci0][0;33m 61.522405[0m
      [0;36mChannel:[0m 64 len 6 [PSM 3 mode Basic (0x00)] {chan 0}[0m
      [0;35mRFCOMM: Unnumbered Info with Header Check (UIH)[0m (0xef)[0m
        [0m[0m Address: 0x09 cr 0 dlci 0x02[0m
        [0m[0m Control: 0xef poll/final 0[0m