---------------------------------global commands:----------------------------------
-h/help - Print hdc help
-v/version - Print hdc version
-l 0-5 - Set runtime loglevel
-t connectkey - Use device with given connect key
---------------------------------component commands:-------------------------------
session commands(on server):
discover - Discover devices listening on TCP via LAN broadcast
list targets [-v] - List all devices status, -v for detail
tconn key - Connect device via key, TCP use ip:port
example:192.168.0.100:10178/192.168.0.100
USB connect automatic, TCP need to connect manually