PLease try:
QString Commands =
"list List available controllers\n"
"show Controller information\n"
"select Select default controller\n"
"devices List available devices\n"
"paired-devices List paired devices\n"
"system-alias Set controller alias\n"
"reset-alias Reset controller alias\n"
"power Set controller power\n"
"pairable Set controller pairable mode\n"
"discoverable Set controller discoverable mode\n"
"discoverable-timeout Set discoverable timeout\n"
"agent Enable/disable agent with given capability\n"
"default-agent Set agent as the default one\n"
"advertise Enable/disable advertising with given type\n"
"set-alias Set device alias\n"
"scan Scan for devices\n"
"info Device information\n"
"pair Pair with device\n"
"cancel-pairing Cancel pairing with device\n"
"trust Trust device\n"
"untrust Untrust device\n"
"block Block device\n"
"unblock Unblock device\n"
"remove Remove device\n"
"connect Connect device\n"
"disconnect Disconnect device";