Use couple of -v / --verbose parameters to increase logging verbosity.

README

  -p --port <port_number>    | Set device port (default: 9990).
 
 Misc options:
- -v --verbose               | Enable verbose logging.
+ -v --verbose               | Increase logging verbosity.
  -q --quiet                 | Suppress warnings.
  -h --help                  | Show help screen.
  -V --version               | Show program version.

cmd.c

 	}
 
 	v("verbose: Got '%s' command.\n", v->txt);
+	if (verbose > 1)
+		v("----\n%s\n----\n", cmd);
 
 	bool cmd_response = false;
 	char *p, *cmd_data = xstrdup( cmd + strlen(v->txt) + 2 ); // +2 to compensate for :\n at the end of the command

videohubctrl.c

 	printf(" -p --port <port_number>    | Set device port (default: 9990).\n");
 	printf("\n");
 	printf("Misc options:\n");
-	printf(" -v --verbose               | Enable verbose logging.\n");
+	printf(" -v --verbose               | Increase logging verbosity.\n");
 	printf(" -q --quiet                 | Suppress warnings.\n");
 	printf(" -h --help                  | Show help screen.\n");
 	printf(" -V --version               | Show program version.\n");
 				data->dev_port = optarg;
 				break;
 			case 'v': // --verbose
-				verbose = !verbose;
+				verbose++;
 				if (verbose)
 					quiet = 0; // Disable quiet
 				break;