ROS 2 hardware bridge solves Yahboom 520 motor driver serial conflicts

Short summary

Solve serial-port conflicts in ROS 2 robotics by building a unified hardware bridge that centralizes communication with Yahboom 520 motor drivers. The bridge subscribes to /cmd_vel commands and publishes odometry at 20 Hz, delegating motor control and encoder reading to the STM32 coprocessor. Complete Python implementation demonstrates proper ROS 2 node architecture, kinematics, and transform broadcasting.

• •Multi-node serial access causes Linux device-lock errors; solve by routing all motor and encoder I/O through a single unified bridge node
• •STM32 coprocessor handles PID loops and encoder reads; your ROS 2 node just sends $speed:A,0,C,0# and polls $read# at 20 Hz
• •Includes complete working code with quaternion transforms, odometry calculations, and proper Jetson/Raspberry Pi integration patterns

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