Add reattach USB command.

DSTAT/src/main.c

@@ -45,6 +45,12 @@ int8_t command_handler(char command){
                 printf("T%u.%u.%u.%u\n\r", tcs_data[0], tcs_data[1], tcs_data[2], tcs_data[3]);
             }
             break;
+        
+        case 'R': //Restart USB
+            udc_detach();
+            delay_ms(100);
+            udc_attach();
+            break;
             
 		case 'V': //check version
 			printf("V%u.%u\n\r", BOARD_VER_MAJOR, BOARD_VER_MINOR);