[Relay] Crate Init + Wifi Library

.github/workflows/rust_ci.yml

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+name: Rust CI
+
+on:
+  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:
+        crate: ["relay", "wifi"]
+        action:
+#          - command: check
+#            args: --target=xtensa-esp32-espidf --release
+          - command: fmt
+            args: --all -- --check --color always
+#          - command: clippy
+#            args: --target=xtensa-esp32-espidf --all-features --workspace -- -D warnings
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Setup Rust
+        uses: esp-rs/[email protected]
+        with:
+          default: true
+          buildtargets: esp32
+          ldproxy: true
+      - name: Enable caching
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "relay/ -> target
+          wifi/ -> target"
+      - name: Xtensa rustup target
+        run: espup install
+      - name: Source espup script
+        run: . $HOME/export-esp.sh
+      - name: Run command
+        run: cargo ${{ matrix.action.command }} --manifest-path=${{ matrix.crate }}/Cargo.toml ${{ matrix.action.args }}

.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# jetbrains
+.idea
+
+/.embuild

relay/.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"
+

relay/.gitignore

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+/target
+.embuild