After some more investigation I found out that the software I am using
is NOT using hcitool. It really seems to be another problem since the
custom software and the hcitool lescan command are throwing the same
error observed with btmon:
@ RAW Close: hcitool
{0x0004}
20:16:29.633716
@ RAW Open: hcitool (privileged) version 2.22
{0x0004} [hci0]
20:16:29.633742
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7
#35 [hci0]
20:16:29.633780
Type: Active (0x01)
Interval: 10.000 msec (0x0010)
Window: 10.000 msec (0x0010)
Own address type: Public (0x00)
Filter policy: Accept all advertisement (0x00)
> HCI Event: Command Complete (0x0e) plen 4
> #36 [hci0]
> 20:16:29.750680
LE Set Scan Parameters (0x08|0x000b) ncmd 1
Status: Command Disallowed (0x0c)
@ RAW Close: hcitool
Software (phython):
@ RAW Open: python (privileged) version 2.22
{0x0003} [hci0]
20:14:38.006713
> HCI Event: Command Complete (0x0e) plen 4
> #28 [hci0]
> 20:14:38.119126
LE Set Scan Enable (0x08|0x000c) ncmd 1
Status: Command Disallowed (0x0c)
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7
#29 [hci0]
20:14:38.119219
Type: Passive (0x00)
Interval: 10.000 msec (0x0010)
Window: 10.000 msec (0x0010)
Own address type: Public (0x00)
Filter policy: Accept all advertisement (0x00)
> HCI Event: Command Complete (0x0e) plen 4
> #30 [hci0]
> 20:14:38.119989
LE Set Scan Parameters (0x08|0x000b) ncmd 1
Status: Command Disallowed (0x0c)
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7
#31 [hci0]
20:14:38.120063
Type: Passive (0x00)
Interval: 10.000 msec (0x0010)
Window: 10.000 msec (0x0010)
Own address type: Public (0x00)
Filter policy: Accept all advertisement (0x00)
> HCI Event: Command Complete (0x0e) plen 4
> #32 [hci0]
> 20:14:38.120946
LE Set Scan Parameters (0x08|0x000b) ncmd 1
Status: Command Disallowed (0x0c)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2
#33 [hci0]
20:14:38.120988
Scanning: Enabled (0x01)
Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4
> #34 [hci0]
> 20:14:38.121945
LE Set Scan Enable (0x08|0x000c) ncmd 1
Status: Command Disallowed (0x0c)
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https://bugs.launchpad.net/bugs/1870837
Title:
hcitool lescan says 'Set scan parameters failed: Input/output error'
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