Set scan parameters failed: Input/output error.

[sethuraman447]

I'm trying to do a lescan using hcitool on the raspberry pi.

The command prints out

Set scan parameters failed: Input/output error.

I'm not sure, what exactly happens here.

I'm using a BLE dongle.

However, if I restart my machine, it shows the a MAC address after I issue the lescan command, and starts showing the same error after I issue the lescan command a couple of more times. Is it like, the lescan command cannot be issued more than once?

[nirmankarta]

try:

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hciconfig hci0 down
hciconfig hci0 up

and check the status afterwords.

if this doesn't work or it hangs in DOWN status, try:

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service bluetooth restart
service dbus restart

(all commands as superuser)

And close all application that may access bluetooth. For example hcidump.

If that doesn't work you normally have to unplug it. But there is another dirty hack to do this. It works by setting the authorized to 0 and than 1 again. This forces the usb dongle to init.

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lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp. 
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. 
Bus 001 Device 004: ID 0a5c:21e8 Broadcom Corp. 


cd /sys/bus/usb/devices/

grep -i -s -r 0a5c *
…
1-1.2/idVendor:0a5c
…

cd 1-1.2

echo 0 > authorized
echo 1 > authorized

Source: http://stackoverflow.com/questions/2206 ... -i-o-error

[svoss]

hello, iam getting the same error and another

as superuser, did

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hciconfig hci0 down
hciconfig hci0 up

did not change anything

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service bluetooth restart
service dbus restart
sudo hcitool lescan

thows:
Set scan parameters failed: File descriptor in Bad State

hcitool dev gives one MAC Adress
any ideas?

[svoss]

nevermind. make sure to put hci 0 up again after the last commands ! (facepalm myself)