/usr/bin/turnutils_natdiscovery: invalid option -- '-'
Usage: natdiscovery [options] address
Options:
        -m      NAT mapping behavior discovery
        -f      NAT filtering behavior discovery
        -t      NAT mapping lifetime behavior discovery
                Requires a timer (-T)
        -c      NAT collision behavior discovery
                Requires an alternative IP address (-A)
        -H      NAT hairpinning behavior discovery
        -P      Add 1500 byte Padding to the behavior discovery
                Applicable with all except NAT mapping Lifetime discovery
        -p      STUN server port (Default: 3478)
        -L      Local address to use (optional)
        -l      Local port to use (use with -L)
        -A      Local alternative address to use
                Used by collision behavior discovery
        -T      Mapping lifetime timer (sec)
                Used by mapping lifetime behavior discovery