fprintf(stderr, "\t-i\t\tinteractive mode (connect HM-CFG-USB to terminal)\n");
fprintf(stderr, "\t-l ip\t\tlisten on given IP address only (for example 127.0.0.1)\n");
fprintf(stderr, "\t-L logfile\tlog network-communication to logfile\n");
fprintf(stderr, "\t-i\t\tinteractive mode (connect HM-CFG-USB to terminal)\n");
fprintf(stderr, "\t-l ip\t\tlisten on given IP address only (for example 127.0.0.1)\n");
fprintf(stderr, "\t-L logfile\tlog network-communication to logfile\n");