I have created a repository on GitHub (https://github.com/BaldEagleX02/Arduino-Nim) to work on an Arduino library for Nim. I am going to wrap the whole Arduino core library (which I have copied in my repo) in a Nim file using Nimterop (https://github.com/nimterop/nimterop). I am looking for someone willing to help me with that huge project. This library could become the most important Nim implementation in the IoT field. It could become a starting point for a bigger framework too.
To contribute, wrap some C++ code with Nimterop, test it and open a pull request. The most active contributors could gain write access to the repo.
P.S. I have also created an IRC channel on freenode (##nim-iot) to discuss about future Nim implementations for IoT and embedded devices.