Executing "hcitool cmd 0x03 0x0003" made the error with hcitool disappear:
hcitool lescan
LE Scan ...
But hcitool does not seem to work as I can't find any ble devices.
btmon output after executing "hcitool cmd 0x03 0x0003 and hcitool lescan:
> HCI Event: Command Complete (0x0e) plen 4
> #51 [hci0] 21:45:08.127791
LE Set Scan Enable (0x08|0x000c) ncmd 2
Status: Success (0x00)
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7
#52 [hci0] 21:45:08.127962
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
> #53 [hci0] 21:45:08.128699
LE Set Scan Parameters (0x08|0x000b) ncmd 1
Status: Success (0x00)
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7
#54 [hci0] 21:45:08.128795
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
> #55 [hci0] 21:45:08.129744
LE Set Scan Parameters (0x08|0x000b) ncmd 1
Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2
#56 [hci0] 21:45:08.129821
Scanning: Enabled (0x01)
Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4
> #57 [hci0] 21:45:08.131737
LE Set Scan Enable (0x08|0x000c) ncmd 2
Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2
#58 [hci0] 21:45:08.190201
Scanning: Disabled (0x00)
Filter duplicates: Enabled (0x01)
> HCI Event: Command Complete (0x0e) plen 4
> #59 [hci0] 21:45:08.200856
LE Set Scan Enable (0x08|0x000c) ncmd 2
Status: Success (0x00)
@ RAW Close: hcitool
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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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