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sudo timeout -s SIGINT 5s hcitool cc 11:22:33:44:55:66; hcitool rssi 11:22:33:44:55:66; hcitool tpl 11:22:33:44:55:66
==>
Can't create connection: Connection timed out
Read RSSI failed: Input/output error
HCI read transmit power level request failed: Input/output error
will slow down Wifi: e.g. doing a ifconfig will wait until the hcitool is finished, it looks as if ifconfig is hanging, but it is actually the ssh communication terminal that is not sending / receiving
You can try this yourself: open 2 ssh session to the RPI, in one window do the hcitool command in the other do e.g. ifconfig
On an RPI with ethernet connection there is no impact .
will need to think about how to address this, (e.g. when hcitool is active delay sending or visa versa..)
Karl