hello world working with sys

.cargo/config.toml

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+[build]
+target = "xtensa-esp32-espidf"
+
+[target.xtensa-esp32-espidf]
+linker = "ldproxy"
+# runner = "espflash --monitor" # Select this runner for espflash v1.x.x
+runner = "espflash flash --monitor" # Select this runner for espflash v2.x.x
+rustflags = [ "--cfg",  "espidf_time64"] # Extending time_t for ESP IDF 5: https://github.com/esp-rs/rust/issues/110
+
+[unstable]
+build-std = ["std", "panic_abort"]
+
+[env]
+MCU="esp32"
+# Note: this variable is not used by the pio builder (`cargo build --features pio`)
+ESP_IDF_VERSION = "v5.1.2"
+

.github/workflows/rust_ci.yml

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+name: Continuous Integration
+
+on:
+  push:
+    paths-ignore:
+      - "**/README.md"
+  pull_request:
+  workflow_dispatch:
+
+env:
+  CARGO_TERM_COLOR: always
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+jobs:
+  rust-checks:
+    name: Rust Checks
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        action:
+          - command: build
+            args: --release
+          - command: fmt
+            args: --all -- --check --color always
+          - command: clippy
+            args: --all-targets --all-features --workspace -- -D warnings
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Enable caching
+        uses: Swatinem/rust-cache@v2
+      - name: Setup Rust
+        uses: esp-rs/xtensa-toolchain@v1.5
+        with:
+          default: true
+          buildtargets: esp32
+          ldproxy: true
+      - name: Run command
+        run: cargo ${{ matrix.action.command }} ${{ matrix.action.args }}

.gitignore

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+/.vscode
+/.embuild
+/target
+/Cargo.lock
+/cfg.toml

Cargo.toml

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+[package]
+name = "sensesp-rs"
+version = "0.1.0"
+authors = ["Carl Middleton <dev@carlcodes.com>"]
+edition = "2021"
+resolver = "2"
+rust-version = "1.71"
+
+[profile.release]
+opt-level = "s"
+
+[profile.dev]
+debug = true    # Symbols are nice and they don't increase the size on Flash
+opt-level = "z"
+
+[features]
+default = ["std", "embassy", "esp-idf-svc/native"]
+pio = ["esp-idf-svc/pio"]
+std = ["alloc", "esp-idf-svc/binstart", "esp-idf-svc/std"]
+alloc = ["esp-idf-svc/alloc"]
+nightly = ["esp-idf-svc/nightly"]
+experimental = ["esp-idf-svc/experimental"]
+embassy = ["esp-idf-svc/embassy-sync", "esp-idf-svc/critical-section", "esp-idf-svc/embassy-time-driver"]
+
+[dependencies]
+anyhow      = "=1.0.75"
+esp-idf-svc = { version = "0.48", default-features = false }
+log = { version = "0.4", default-features = false }
+#rgb-led     = { path = "../../common/lib/rgb-led" }
+#wifi        = { path = "../../common/lib/wifi" }
+toml-cfg    = "=0.1.3"
+
+[build-dependencies]
+embuild = "0.31.3"
+toml-cfg    = "=0.1.3"

build.rs

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+#[toml_cfg::toml_config]
+pub struct Config {
+    #[default("")]
+    wifi_ssid: &'static str,
+    #[default("")]
+    wifi_psk: &'static str,
+}
+
+fn main() {
+    // Check if the `cfg.toml` file exists and has been filled out.
+    if !std::path::Path::new("cfg.toml").exists() {
+        panic!("You need to create a `cfg.toml` file with your Wi-Fi credentials! Use `cfg.toml.example` as a template.");
+    }
+
+    // The constant `CONFIG` is auto-generated by `toml_config`.
+    let app_config = CONFIG;
+    if app_config.wifi_ssid == "FBI Surveillance Van" || app_config.wifi_psk == "hunter2" {
+        panic!("You need to set the Wi-Fi credentials in `cfg.toml`!");
+    }
+
+    embuild::espidf::sysenv::output();
+}

cfg.toml.example

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+[hardware-check]
+wifi_ssid = "FBI Surveillance Van"
+wifi_psk = "hunter1"

rust-toolchain.toml

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+[toolchain]
+channel = "esp"
+components = ["rustfmt", "rustc-dev"]
+targets = ["xtensa-esp32-none-elf"]

sdkconfig.defaults

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+# Rust often needs a bit of an extra main task stack size compared to C (the default is 3K)
+CONFIG_ESP_MAIN_TASK_STACK_SIZE=8000
+
+# Use this to set FreeRTOS kernel tick frequency to 1000 Hz (100 Hz by default).
+# This allows to use 1 ms granuality for thread sleeps (10 ms by default).
+#CONFIG_FREERTOS_HZ=1000
+
+# Workaround for https://github.com/espressif/esp-idf/issues/7631
+#CONFIG_MBEDTLS_CERTIFICATE_BUNDLE=n
+#CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_DEFAULT_FULL=n

src/main.rs

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+use anyhow::{bail, Result};
+use esp_idf_svc::eventloop::EspSystemEventLoop;
+use esp_idf_svc::hal::prelude::Peripherals;
+use log::info;
+use esp_idf_svc::wifi;
+
+#[toml_cfg::toml_config]
+pub struct Config {
+    #[default("")]
+    wifi_ssid: &'static str,
+    #[default("")]
+    wifi_psk: &'static str,
+}
+
+fn main() {
+    // It is necessary to call this function once. Otherwise some patches to the runtime
+    // implemented by esp-idf-sys might not link properly. See https://github.com/esp-rs/esp-idf-template/issues/71
+    esp_idf_svc::sys::link_patches();
+
+    // Bind the log crate to the ESP Logging facilities
+    esp_idf_svc::log::EspLogger::initialize_default();
+
+    log::info!("Hello, world!");
+}