dev-ros/
rosserial_arduino

Libraries and examples for ROSserial usage on Arduino/AVR Platforms

https://wiki.ros.org/rosserial_arduino

There are no pull requests

You think something is missing here?
Start with filling a new pull requests.

If you also like to help the Gentoo project, you can consider sending a Pull Request via GitHub.
Before doing so, you might want to take a look at the wiki page.