Book looks great, I just started learning nim last week and I think I'll get a copy.
I was intrigued by nim for its transpiling to C/JS (two languages I loathe programming in). I like the syntax and structure of nim and wanted to use it simple programs to upload to arduinos. Your book mentioned embedded systems in the introduction, but there is not a chapter devoted to it. Do you have any resources you can share about using nim on microcontrollers (Arduino or the like)?
Unfortunately I don't have anything that isn't immediately searchable via Google (for example: http://disconnected.systems/blog/nim-on-adruino/). I was indeed planning to write a chapter on this but due to page count constraints I wasn't able to, that said I will do my best to write an article on this at least and post it on nim-lang.org as well as on book.picheta.me :)
I do also know one person that was working on some cool microcontroller stuff in Nim, I keep asking him to write a blog article about this but he's currently busy with other things. Maybe soon it will happen to though. If so I will encourage him to post it on Nim's website and if he doesn't I will definitely tweet about it here: https://twitter.com/nim_lang.
If you are interested to look into the new generation of
system programming languages , this book will open the door to one of the best of the crop. Nim.
Also feel free to ask me anything about Nim, publishing a book or anything else.