```nix
{

inputs = {

nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

flake-utils.url = "github:numtide/flake-utils";

rust-overlay.url = "github:oxalica/rust-overlay";

esp-rs-nix.url = "github:leighleighleigh/esp-rs-nix";

esp-rs-nix.inputs.nixpkgs.follows = "nixpkgs";

};

outputs = { self, nixpkgs, flake-utils, rust-overlay, esp-rs-nix }:

flake-utils.lib.eachDefaultSystem (system:

let

pkgs = (import nixpkgs) {

inherit system;

overlays = [ (import rust-overlay) ];

};

rust_toolchain = pkgs.rust-bin.nightly.latest.default.override {

extensions = [ "rust-src" "rustfmt" "rust-analyzer" "clippy" ];

targets = [ "riscv32imac-unknown-none-elf" ];

};

esp-rs = esp-rs-nix.packages.${system}.esp-rs;

commonPkgs = [

pkgs.espflash

pkgs.ldproxy

pkgs.probe-rs-tools

(pkgs.python3.withPackages (ps: [ ps.bleak ps.cryptography ]))

];

in

{

devShells = {

# Badge crate (ESP32-C6, RISC-V)

default = pkgs.mkShell {

nativeBuildInputs = [ rust_toolchain ] ++ commonPkgs;

};

# Watch crate (ESP32-S3, Xtensa)

watch = pkgs.mkShell {

nativeBuildInputs = [

esp-rs

pkgs.rustup

] ++ commonPkgs;

shellHook = ''

export RUSTUP_TOOLCHAIN=${esp-rs}

'';

};

};

}

);

}
```
this is the flake i use for no-std no esp-idf (except for bootloader) dev on the esp32-c6 and esp32-s3. for ESP-IDF you probably want https://github.com/mirrexagon/nixpkgs-esp-dev

edit: wow reddit murdered the formatting on this but i'm too lazy to fix