In the Husarion Panther robot, which microcontroller is used, and do we have to write the firmware for the BLDC motor driver, or is it already provided?
No, you don’t need to write firmware for the robot itself. It will be exposed as a ROS 2 interface. Specifically for locomotion there will be a regular ROS cmd_vel. This is specified in erc2025/TECHNICAL_HANDBOOK.md at main · husarion/erc2025 · GitHub
For more entry level topics look for things like Kinematics and Visualization | Husarion in our docs