Help hcitool cmd (hci to connect)

Dear all,

Please, could anyone tell me how to connect to a bluetooth device
through hcitool (BlueZ) hci command. Like this: "hcitool cmd 0x01
0x0005 [parameters]". How can I input this cmd? Is the [parameters] a
bt device MAC adress like XX:XX:XX:XX:XX:XX?

I've tryed to use "hcitool cc <MAC>", but it doesn't work for me cause
it disconnects the device a second later.

I just wanna measure RSSI.

Thanks in advance.

Best

Thibaut