I was running btmon through pcat to avoid running out of space on the device. I think this was causing packets to be cut off midstream at the end.
Here is the btmon output when turning scan off:
LE Extended Advertising Report (0x0d)
Num reports: 1
Entry 0
Event type: 0x0010
Props: 0x0010
Use legacy advertising PDUs
Data status: Complete
Legacy PDU Type: ADV_NONCONN_IND (0x0010)
Address type: Random (0x01)
Address: 06:62:7D:C6:64:48 (Non-Resolvable)
Primary PHY: LE 1M
Secondary PHY: No packets
SID: no ADI field (0xff)
TX power: 127 dBm
RSSI: -68 dBm (0xbc)
Periodic advertising interval: 0.00 msec (0x0000)
Direct address type: Public (0x00)
Direct address: 00:00:00:00:00:00 (OUI 00-00-00)
Data length: 0x1f
1e ff 06 00 01 09 20 02 74 f5 eb a3 76 9d e7 b5 ...... .t...v...
11 e6 85 a0 41 ca 09 4d 27 f1 f6 dc a5 5f bc ....A..M'...._.
Company: Microsoft (6)
Data: 0109200274f5eba3769de7b511e685a041ca094d27f1f6dca55fbc
@ MGMT Command: Stop Discovery (0x0024) plen 1 {0x0001} [hci0] 159.216816
Address type: 0x06
LE Public
LE Random
@ MGMT Event: Command Complete (0x0001) plen 4 {0x0001} [hci0] 159.220056
Stop Discovery (0x0024) plen 1
Status: Rejected (0x0b)
Address type: 0x06
LE Public
LE Random
John Klug
From: John Klug
Sent: Wednesday, July 6, 2022 5:23 PM
To: Linux-Bluetooth MailingList <linux-bluetooth@xxxxxxxxxxxxxxx>
Subject: [BUG] Extended Scan Hangs
Bluez5 from master on 27 June 2022
1d6cfb8e625a944010956714c1802bc1e1fc6c4f
monitor: Fix crash when using RTT backend
Kernel:
5.4.199
After turning scan on, after a short time it hangs. Here are the packets to start discovery:
< HCI Command: LE Set Exte.. (0x08|0x0042) plen 6 #1777 [hci0] 11:06:02.731748
Extended scan: Enabled (0x01)
Filter duplicates: Enabled (0x01)
Duration: 0 msec (0x0000)
Period: 0.00 sec (0x0000)
> HCI Event: Command Complete (0x0e) plen 4 #1778 [hci0] 11:06:02.741529
LE Set Extended Scan Enable (0x08|0x0042) ncmd 1
Status: Success (0x00)
@ MGMT Event: Command Complete (0x0001) plen 4 {0x0001} [hci0] 11:06:02.741819
Start Discovery (0x0023) plen 1
Status: Success (0x00)
Address type: 0x06
LE Public
LE Random
@ MGMT Event: Discovering (0x0013) plen 2 {0x0001} [hci0] 11:06:02.741899
Address type: 0x06
LE Public
LE Random
Discovery: Enabled (0x01)
After a short time and 1215 devices found (0x0012), no commands may be executed:
bluetooth]# scan off
Failed to stop discovery: org.bluez.Error.InProgress
btmon output looks stuck. Often the output stops in the middle of an event:
> HCI Event: LE Meta Event (0x3e) plen 41 #3484 [hci0] 11:06:13.493567
LE Extended Advertising Report (0x0d)
Num reports: 1
Entry 0
Event type: 0x0010
Props: 0x0010
Use legacy advertising PDUs
Data status: ^[[0;32mComplete^[[0m
Legacy PDU Type: ADV_NONCONN_IND (0x0010)
Address type: Random (0x01)
Address: 0C:7D:02:DB:5A:57 (Non-Resolvable)
Prima
Note that "Primary PHY" is incomplete.
The hang during scan happens 100% of the time.
John Klug
