Harsh Davda

Getting undefined reference when compiling for board stm32f4discovery

10

### Steps to reproduce: ``` ros2 run micro_ros_setup create_firmware_ws.sh nuttx stm32f4discovery ros2 run micro_ros_setup configure_firmware.sh uros ``` other configuration steps as given [here](https://micro-ros.github.io//docs/tutorials/core/first_application_rtos/nuttx/) Followed by : ` ros2 run micro_ros_setup...