Nim ESP32 - Hello Network
Example repo for using Nim with ESP32 on FreeRTOS & LwIP.
An example using only wifi is available at simplewifi, check out its README for instruction in how to build that if your board doesn't have an ethernet chip.
Building
Install a devel version of the compiler.
Then goto the nim/ folder and do a make. This will generate Nim C output files using a local Makefile (not part of the ESP-IDF build system).
Afterwards, do a make menuconfig in the main folder. You don't need to run a make menuconfig everytime after updating Nim, but only when Nim outputs a new Nim C file (e.g. you pull in a new Nim library, etc). This could be cleaned up in the future I'm sure.
Once the generated Nim sources are registered with ESP-IDF's build system, then all you need to do is the standard idf.py build and upload steps.
Info
Here's the Nim Forum thread: https://forum.nim-lang.org/t/6345
The primary branch I'm using is here: https://github.com/elcritch/Nim/tree/devel-basic-freertos-network, it was already merged into devel.
Beware, only ARC works as the other GC's need another memory backend. It's easy to add, but I removed it until the main FreeRTOS options are added in upstream.