need some guidance

[szeyuan1227]

hi, i am using arduino mega 2560 with cytron mdd10a rev2.0 motor driver to control my mecanum wheel robot based on https://github.com/deborggraever/ros2-mecanum-bot.git this repo, but when i try to print the command send from hardware interface to microcontroller, the output looks weird, it has some unknown command received from hardware interface, as shown below. may i know how to use this firmware to drive my robot?