hcitool lescan shows I/O error

Question

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

The command prints out

Set scan parameters failed: Input/output error. 

Answer 1

I had the same error with hcitool, while bluetoothctl worked just fine. Then I ran across this article stating that all "tools using raw socket shall be considered deprecated" (hcitool, hcicfg, etc.).

So maybe just open bluetoothctl and issue a scan on command.