rosserial VS Micro-XRCE-DDS

A core package of ROS1 is the Rosserial. It supports several concrete microcontrollers, including the Arduino, STM32, Teensy. Effectively, this package is a set of C/C++ headers that you incorporate in your microcontroller code. Then, you can directly receive and send ROS messages using the imported ROS message format. The receiver, e.g. your single board computer, needs to implement a ROS server. Here, you can use either C++ or Python. There are several examples in the Github repository. I also recommend a great blog article about connecting ROS to Arduino with L298D to directly convert TWIST messages to motor controller PWMs.

3 - On your ros linux PC, you can either download Rosserial (ex. sudo apt install os-melodic-rosserial-arduino), or build rosserial from source (https://github.com/ros-drivers/rosserial). Either way, you'll have a tool that can generate the Arduino side library for you (it will generate headers for all current messages/services... including your custom ones). For example:

The ROS2Arduino library support more powerful Arduino Boards with at lest 32KB RAM and a TCP/IP hardware. Internally, it is build on top of the Micro XRCE-DDS framework, which provides Serial, UDP or TCP connections. According to the documentation, it only supports ROS2 up to the Dashing Diademata distribution.

set(dds-xrce_VERSION v2.0.0) set(micro-cdr_VERSION v1.2.1) FetchContent_Declare( micro-cdr GIT_REPOSITORY https://github.com/eProsima/Micro-CDR.git GIT_TAG ${micro-cdr_VERSION} ) FetchContent_Declare( dds-xrce GIT_REPOSITORY https://github.com/eProsima/Micro-XRCE-DDS-Client.git GIT_TAG ${dds-xrce_VERSION} )