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Connection Made then Dropped Right Away
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Connection Made then Dropped Right Away

  • Subject: Connection Made then Dropped Right Away
  • From: Chip Wachob <email@hidden>
  • Date: Wed, 11 Oct 2017 09:25:03 -0400
Hello,

New questions now that I've made some progress on the HID side of things...
I've been able to look at the Bluetooth traces on the HID side of my connection and I keep coming across the following.  I'm sure that this message is more meaningful to those who wrote the Bluez stack, but I'm not having any luck finding out what it really means and how to 'fix' it.  I'm hoping that someone on the list is able to give me a pointer as to what this message is trying to tell me. 

Result: Connection refused - security block (0x0003)
What I am observing is that I can try to connect to my HID device from external sources (I've tried many different devices with the same results).  The connection will appear to be made, then within seconds will be dropped.  The external devices that I try to connect indicate that they are 'paired' with the HID device after this.
My gut is telling me that it may have something to do with the attributes or the pairing configuration on the HID side, but I don't have a clue as to where to start looking.
I've tried turning SSP on and off, likewise with Auth and Encrypt.  I can't say that I've tried every possible combination of the three yet, but adding each of them one at a time didn't seem to make any difference.  The same "Connection refused" message comes up.
Thank you in advance for your help,  below is the btmon dump, I'm sorry that it is so long.  I've marked the entry in question with ~~~ below.
[The mailing list came back and told me that the message was too long, so I'm removing part of the log file in hopes that it will pass the monitor] 





Bluetooth monitor ver 5.37

= New Index: 5C:F3:70:77:62:B0 (BR/EDR,USB,hci0) [hci0] 0.536789

= Open Index: 5C:F3:70:77:62:B0 [hci0] 134.237134


<<< snip >>>


> ACL Data RX: Handle 11 flags 0x02 dlen 14 [hci0] 265.221184

L2CAP: Configure Response (0x05) ident 4 len 6

Source CID: 64

Flags: 0x0000

Result: Success (0x0000)

> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 265.224186

Num handles: 1

Handle: 11

Count: 2

> ACL Data RX: Handle 11 flags 0x02 dlen 17 [hci0] 265.225185

Channel: 64 len 13 [PSM 1 mode 0] {chan 0}

SDP: Service Search Request (0x02) tid 0 len 8

Search pattern: [len 5]

Sequence (6) with 3 bytes [8 extra bits] len 5

UUID (3) with 2 bytes [0 extra bits] len 3

Human Interface Device Service (0x1124)

Max record count: 21

Continuation state: 0

< ACL Data TX: Handle 11 flags 0x00 dlen 18 [hci0] 265.225349

Channel: 77 len 14 [PSM 1 mode 0] {chan 0}

SDP: Service Search Response (0x03) tid 0 len 9

Total record count: 1

Current record count: 1

Record handle: 0x10000

Continuation state: 0

> ACL Data RX: Handle 11 flags 0x02 dlen 23 [hci0] 265.231183

Channel: 64 len 19 [PSM 1 mode 0] {chan 0}

SDP: Service Attribute Request (0x04) tid 1 len 14

Record handle: 0x10000

Max attribute bytes: 656

Attribute list: [len 7]

Sequence (6) with 5 bytes [8 extra bits] len 7

Unsigned Integer (1) with 4 bytes [0 extra bits] len 5

0x0000ffff

Continuation state: 0

< ACL Data TX: Handle 11 flags 0x00 dlen 359 [hci0] 265.231317

Channel: 77 len 355 [PSM 1 mode 0] {chan 0}

SDP: Service Attribute Response (0x05) tid 1 len 350

Attribute bytes: 347

Attribute list: [len 344] {position 0}

Attribute: Service Record Handle (0x0000) [len 2]

0x00010000

Attribute: Service Class ID List (0x0001) [len 2]

UUID (3) with 2 bytes [0 extra bits] len 3

Human Interface Device Service (0x1124)

Attribute: Protocol Descriptor List (0x0004) [len 2]

Sequence (6) with 6 bytes [8 extra bits] len 8

UUID (3) with 2 bytes [0 extra bits] len 3

L2CAP (0x0100)

Unsigned Integer (1) with 2 bytes [0 extra bits] len 3

0x0011

Sequence (6) with 3 bytes [8 extra bits] len 5

UUID (3) with 2 bytes [0 extra bits] len 3

HIDP (0x0011)

Attribute: Browse Group List (0x0005) [len 2]

UUID (3) with 2 bytes [0 extra bits] len 3

Public Browse Root (0x1002)

Attribute: Language Base Attribute ID List (0x0006) [len 2]

Unsigned Integer (1) with 2 bytes [0 extra bits] len 3

0x656e

Unsigned Integer (1) with 2 bytes [0 extra bits] len 3

0x006a

Unsigned Integer (1) with 2 bytes [0 extra bits] len 3

0x0100

Attribute: Bluetooth Profile Descriptor List (0x0009) [len 2]

Sequence (6) with 6 bytes [8 extra bits] len 8

UUID (3) with 2 bytes [0 extra bits] len 3

HIDP (0x0011)

Unsigned Integer (1) with 2 bytes [0 extra bits] len 3

0x0100

Attribute: Additional Protocol Descriptor List (0x000d) [len 2]

Sequence (6) with 13 bytes [8 extra bits] len 15

Sequence (6) with 6 bytes [8 extra bits] len 8

UUID (3) with 2 bytes [0 extra bits] len 3

L2CAP (0x0100)

Unsigned Integer (1) with 2 bytes [0 extra bits] len 3

0x0013

Sequence (6) with 3 bytes [8 extra bits] len 5

UUID (3) with 2 bytes [0 extra bits] len 3

HIDP (0x0011)

Attribute: Unknown (0x0100) [len 2]

Bluez virtual Mouse and Keyboard [len 32]

Attribute: Unknown (0x0101) [len 2]

Keyboard [len 8]

Attribute: Unknown (0x0102) [len 2]

Anselm Martin Hoffmeister (GPL v2) [len 34]

Attribute: Unknown (0x0200) [len 2]

0x0100

Attribute: Unknown (0x0201) [len 2]

0x0111

Attribute: Unknown (0x0202) [len 2]

0x40

Attribute: Unknown (0x0203) [len 2]

0x00

Attribute: Unknown (0x0204) [len 2]

true

Attribute: Unknown (0x0205) [len 2]

true

Attribute: Unknown (0x0206) [len 2]

Sequence (6) with 102 bytes [8 extra bits] len 104

Unsigned Integer (1) with 1 byte [0 extra bits] len 2

0x22

String (4) with 98 bytes [8 extra bits] len 100

# #�#�# #� [len 98]

Attribute: Unknown (0x0207) [len 2]

Sequence (6) with 6 bytes [8 extra bits] len 8

Unsigned Integer (1) with 2 bytes [0 extra bits] len 3

0x0409

Unsigned Integer (1) with 2 bytes [0 extra bits] len 3

0x0100

Attribute: Unknown (0x020b) [len 2]

0x0100

Attribute: Unknown (0x020e) [len 2]

0x0000

Continuation state: 0

> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 265.237183

Num handles: 1

Handle: 11

Count: 2

> ACL Data RX: Handle 11 flags 0x02 dlen 12 [hci0] 265.240186

L2CAP: Disconnection Request (0x06) ident 9 len 4

Destination CID: 64

Source CID: 77

< ACL Data TX: Handle 11 flags 0x00 dlen 12 [hci0] 265.240222

L2CAP: Disconnection Response (0x07) ident 9 len 4

Destination CID: 64

Source CID: 77

> HCI Event: Link Key Request (0x17) plen 6 [hci0] 265.250187

Address: 10:D5:42:BB:1F:F5 (Samsung Electronics Co.,Ltd)
< HCI Command: Link Key Request Reply (0x01|0x000b) plen 22 [hci0] 265.250223 

Address: 10:D5:42:BB:1F:F5 (Samsung Electronics Co.,Ltd)

Link key: 04a355b0f7a76da518c012a47f11f622

> HCI Event: Command Complete (0x0e) plen 10 [hci0] 265.255190

Link Key Request Reply (0x01|0x000b) ncmd 1

Status: Success (0x00)

Address: 10:D5:42:BB:1F:F5 (Samsung Electronics Co.,Ltd)

> HCI Event: Encryption Change (0x08) plen 4 [hci0] 265.279191

Status: Success (0x00)

Handle: 11

Encryption: Enabled with E0 (0x01)
< HCI Command: Read Encryption Key Size (0x05|0x0008) plen 2 [hci0] 265.279237 

Handle: 11

> HCI Event: Command Complete (0x0e) plen 7 [hci0] 265.280197

Read Encryption Key Size (0x05|0x0008) ncmd 1

Status: Success (0x00)

Handle: 11

Key size: 16

> ACL Data RX: Handle 11 flags 0x02 dlen 12 [hci0] 265.283184

L2CAP: Connection Request (0x02) ident 10 len 4

PSM: 17 (0x0011)

Source CID: 79

< ACL Data TX: Handle 11 flags 0x00 dlen 16 [hci0] 265.283260

L2CAP: Connection Response (0x03) ident 10 len 8

Destination CID: 64

Source CID: 79

Result: Connection successful (0x0000)

Status: No further information available (0x0000)

< ACL Data TX: Handle 11 flags 0x00 dlen 23 [hci0] 265.283265

L2CAP: Configure Request (0x04) ident 5 len 15

Destination CID: 79

Flags: 0x0000

Option: Retransmission and Flow Control (0x04) [mandatory]

Mode: Basic (0x00)

TX window size: 0

Max transmit: 0

Retransmission timeout: 0

Monitor timeout: 0

Maximum PDU size: 0

> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 265.287182

Num handles: 1

Handle: 11

Count: 2

> ACL Data RX: Handle 11 flags 0x02 dlen 16 [hci0] 265.289188

L2CAP: Configure Request (0x04) ident 11 len 8

Destination CID: 64

Flags: 0x0000

Option: Maximum Transmission Unit (0x01) [mandatory]

MTU: 640

< ACL Data TX: Handle 11 flags 0x00 dlen 18 [hci0] 265.289222

L2CAP: Configure Response (0x05) ident 11 len 10

Source CID: 79

Flags: 0x0000

Result: Success (0x0000)

Option: Maximum Transmission Unit (0x01) [mandatory]

MTU: 640

> ACL Data RX: Handle 11 flags 0x02 dlen 14 [hci0] 265.290182

L2CAP: Configure Response (0x05) ident 5 len 6

Source CID: 64

Flags: 0x0000

Result: Success (0x0000)

< ACL Data TX: Handle 11 flags 0x00 dlen 5 [hci0] 265.290391

Channel: 79 len 1 [PSM 17 mode 0] {chan 0}

15 .

< ACL Data TX: Handle 11 flags 0x00 dlen 12 [hci0] 265.290947

L2CAP: Disconnection Request (0x06) ident 6 len 4

Destination CID: 79

Source CID: 64

> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 265.294206

Num handles: 1

Handle: 11

Count: 2

> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 265.295200

Num handles: 1

Handle: 11

Count: 2

> ACL Data RX: Handle 11 flags 0x02 dlen 12 [hci0] 265.295210

L2CAP: Connection Request (0x02) ident 12 len 4

PSM: 19 (0x0013)

Source CID: 65

< ACL Data TX: Handle 11 flags 0x00 dlen 16 [hci0] 265.295254

L2CAP: Connection Response (0x03) ident 12 len 8

Destination CID: 65

Source CID: 65

Result: Connection pending (0x0001)

Status: Authorization pending (0x0002)

~~~ < ACL Data TX: Handle 11 flags 0x00 dlen 16 [hci0] 265.295770

L2CAP: Connection Response (0x03) ident 12 len 8

Destination CID: 65

Source CID: 65

Result: Connection refused - security block (0x0003)

Status: No further information available (0x0000)

> ACL Data RX: Handle 11 flags 0x02 dlen 12 [hci0] 265.296204

L2CAP: Disconnection Request (0x06) ident 13 len 4

Destination CID: 64

Source CID: 65

< ACL Data TX: Handle 11 flags 0x00 dlen 12 [hci0] 265.296237

L2CAP: Disconnection Response (0x07) ident 13 len 4

Destination CID: 64

Source CID: 79

> ACL Data RX: Handle 11 flags 0x02 dlen 12 [hci0] 265.298197

L2CAP: Disconnection Response (0x07) ident 6 len 4

Destination CID: 79

Source CID: 64

> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 265.300183

Num handles: 1

Handle: 11

Count: 2

> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 265.502203

Num handles: 1

Handle: 11

Count: 1

< HCI Command: Disconnect (0x01|0x0006) plen 3 [hci0] 269.303096

Handle: 11

Reason: Remote User Terminated Connection (0x13)

> HCI Event: Command Status (0x0f) plen 4 [hci0] 269.306107

Disconnect (0x01|0x0006) ncmd 1

Status: Success (0x00)

> HCI Event: Disconnect Complete (0x05) plen 4 [hci0] 269.379094

Status: Success (0x00)

Handle: 11

Reason: Connection Terminated By Local Host (0x16)

@ Device Disconnected: 10:D5:42:BB:1F:F5 (0) reason 2



--
Chip Wachob
Design Engineer
Allen Organ



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