diff --git a/.cargo/config.toml b/.cargo/config.toml
deleted file mode 100644
index aab29b96..00000000
--- a/.cargo/config.toml
+++ /dev/null
@@ -1,9 +0,0 @@
-[alias]
-test-all = "test --features async,chrono,eh0,eh1,eha0a,log,num-rational,std,time,w5500-tls"
-test-dhcp = "test -p w5500-dhcp --features log,std"
-test-ll = "test -p w5500-ll --all-features"
-test-hl = "test -p w5500-hl --all-features"
-test-mqtt = "test -p w5500-mqtt --features log,std,w5500-tls"
-test-regsim = "test -p w5500-regsim --all-features"
-test-sntp = "test -p w5500-sntp --features std,log,eh0,eh1,time,chrono,num-rational"
-test-tls = "test -p w5500-tls --features log,std"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 95bf8f11..6f093f48 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,150 +5,26 @@ on:
     tags:
       - '**'
   pull_request:
-  schedule:
-    - cron: "13 3 * * *"
+  workflow_dispatch:
 
 name: CI
 
 jobs:
-  build:
-    name: Build
+  check:
     runs-on: ubuntu-latest
-    env: {"RUSTFLAGS": "-D warnings"}
-    strategy:
-      matrix:
-        toolchain:
-          - "stable"
-          - "nightly"
     steps:
       - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@master
+      - uses: cachix/install-nix-action@v17
+      - uses: cachix/cachix-action@v10
         with:
-          toolchain: ${{ matrix.toolchain }}
-      - run: cargo build
-      - run: cargo build --all-features
-        if: ${{ matrix.toolchain == 'nightly' }}
-      - run: cargo build -p testsuite
-
-  build_no_std:
-    name: Build no_std
-    runs-on: ubuntu-latest
-    env: {"RUSTFLAGS": "-D warnings"}
-    strategy:
-      matrix:
-        toolchain:
-          - "stable"
-          - "nightly"
-        target:
-          - "thumbv6m-none-eabi"
-          - "thumbv7em-none-eabi"
-    steps:
-      - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@master
-        with:
-          target: ${{ matrix.target }}
-          toolchain: ${{ matrix.toolchain }}
-      - run: cargo build --target ${{ matrix.target }} -p w5500-ll
-      - run: cargo build --target ${{ matrix.target }} -p w5500-hl
-      - run: cargo build --target ${{ matrix.target }} -p w5500-dhcp
-      - run: cargo build --target ${{ matrix.target }} -p w5500-dns
-      - run: cargo build --target ${{ matrix.target }} -p w5500-mqtt
-      - run: cargo build --target ${{ matrix.target }} -p w5500-sntp
-      - run: cargo build --target ${{ matrix.target }} -p w5500-tls
-      - run: cargo build --target ${{ matrix.target }} -p w5500-ll   --features defmt
-      - run: cargo build --target ${{ matrix.target }} -p w5500-hl   --features defmt
-      - run: cargo build --target ${{ matrix.target }} -p w5500-dhcp --features defmt
-      - run: cargo build --target ${{ matrix.target }} -p w5500-dns  --features defmt
-      - run: cargo build --target ${{ matrix.target }} -p w5500-mqtt --features defmt
-      - run: cargo build --target ${{ matrix.target }} -p w5500-tls  --features defmt
-      - run: cargo build --target ${{ matrix.target }} -p w5500-ll   --features eh0,eh1
-      - run: cargo build --target ${{ matrix.target }} -p w5500-hl   --features eh0,eh1
-      - run: cargo build --target ${{ matrix.target }} -p w5500-dhcp --features eh0,eh1
-      - run: cargo build --target ${{ matrix.target }} -p w5500-dns  --features eh0,eh1
-      - run: cargo build --target ${{ matrix.target }} -p w5500-mqtt --features eh0,eh1
-      - run: cargo build --target ${{ matrix.target }} -p w5500-sntp --features eh0,eh1
-      - run: cargo build --target ${{ matrix.target }} -p w5500-tls  --features eh0,eh1
-      - run: cargo build --target ${{ matrix.target }} -p w5500-dhcp --features log
-      - run: cargo build --target ${{ matrix.target }} -p w5500-dns  --features log
-      - run: cargo build --target ${{ matrix.target }} -p w5500-mqtt --features log
-      - run: cargo build --target ${{ matrix.target }} -p w5500-sntp --features log
-      - run: cargo build --target ${{ matrix.target }} -p w5500-tls  --features log
-      - run: cargo build --target ${{ matrix.target }} -p w5500-sntp --features time
-      - run: cargo build --target ${{ matrix.target }} -p w5500-sntp --features chrono
-      - run: cargo build --target ${{ matrix.target }} -p w5500-sntp --features num-rational
-      - run: cargo build --target ${{ matrix.target }} -p w5500-mqtt --features w5500-tls
-      - run: cargo build --target ${{ matrix.target }} -p w5500-ll   --features async
-        if: ${{ matrix.toolchain == 'nightly' }}
-      - run: cargo build --target ${{ matrix.target }} -p w5500-ll   --features eha0a
-        if: ${{ matrix.toolchain == 'nightly' }}
-      - run: cargo build --target ${{ matrix.target }} -p w5500-tls  --features p256-cm4
-        if: ${{ matrix.target == 'thumbv7em-none-eabi' }}
-      - run: cargo build --target ${{ matrix.target }} -p w5500-mqtt --features w5500-tls,p256-cm4
-        if: ${{ matrix.target == 'thumbv7em-none-eabi' }}
-
-  test:
-    name: Test
-    runs-on: ubuntu-latest
-    env: {"RUSTFLAGS": "-D warnings"}
-    steps:
-      - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@nightly
-      - run: cargo test-all
-
-  clippy:
-    name: Clippy
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@nightly
-        with:
-          components: clippy
-      - run: cargo clippy --all-features --all-targets -- --deny warnings
-
-  format:
-    name: Format
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@nightly
-        with:
-          components: rustfmt
-      - run: cargo +nightly fmt -- --check
-
-  rustdoc:
-    name: rustdoc
-    runs-on: ubuntu-latest
-    env: {"RUSTDOCFLAGS": "-D warnings --cfg docsrs"}
-    steps:
-      - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@nightly
-      - name: rustdoc
-        run: |
-          cd dhcp
-          cargo +nightly rustdoc --all-features
-          cd ../dns
-          cargo +nightly rustdoc --all-features
-          cd ../hl
-          cargo +nightly rustdoc --all-features
-          cd ../ll
-          cargo +nightly rustdoc --all-features
-          cd ../mqtt
-          cargo +nightly rustdoc --all-features
-          cd ../regsim
-          cargo +nightly rustdoc --all-features
-          cd ../sntp
-          cargo +nightly rustdoc --all-features
+          name: newam
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+      - run: nix flake check -L
 
   release-ll:
     name: w5500-ll crates.io release
     if: startsWith(github.ref, 'refs/tags/ll/v')
-    needs:
-      - build
-      - build_no_std
-      - test
-      - clippy
-      - format
-      - rustdoc
+    needs: [ "check" ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -163,13 +39,7 @@ jobs:
   release-hl:
     name: w5500-hl crates.io release
     if: startsWith(github.ref, 'refs/tags/hl/v')
-    needs:
-      - build
-      - build_no_std
-      - test
-      - clippy
-      - format
-      - rustdoc
+    needs: [ "check" ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -184,13 +54,7 @@ jobs:
   release-dhcp:
     name: w5500-dhcp crates.io release
     if: startsWith(github.ref, 'refs/tags/dhcp/v')
-    needs:
-      - build
-      - build_no_std
-      - test
-      - clippy
-      - format
-      - rustdoc
+    needs: [ "check" ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -205,13 +69,7 @@ jobs:
   release-regsim:
     name: w5500-regsim crates.io release
     if: startsWith(github.ref, 'refs/tags/regsim/v')
-    needs:
-      - build
-      - build_no_std
-      - test
-      - clippy
-      - format
-      - rustdoc
+    needs: [ "check" ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -226,13 +84,7 @@ jobs:
   release-dns:
     name: w5500-dns crates.io release
     if: startsWith(github.ref, 'refs/tags/dns/v')
-    needs:
-      - build
-      - build_no_std
-      - test
-      - clippy
-      - format
-      - rustdoc
+    needs: [ "check" ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -247,13 +99,7 @@ jobs:
   release-mqtt:
     name: w5500-mqtt crates.io release
     if: startsWith(github.ref, 'refs/tags/mqtt/v')
-    needs:
-      - build
-      - build_no_std
-      - test
-      - clippy
-      - format
-      - rustdoc
+    needs: [ "check" ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -268,13 +114,7 @@ jobs:
   release-sntp:
     name: w5500-sntp crates.io release
     if: startsWith(github.ref, 'refs/tags/sntp/v')
-    needs:
-      - build
-      - build_no_std
-      - test
-      - clippy
-      - format
-      - rustdoc
+    needs: [ "check" ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -289,13 +129,7 @@ jobs:
   release-tls:
     name: w5500-tls crates.io release
     if: startsWith(github.ref, 'refs/tags/tls/v')
-    needs:
-      - build
-      - build_no_std
-      - test
-      - clippy
-      - format
-      - rustdoc
+    needs: [ "check" ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
diff --git a/.gitignore b/.gitignore
index baa56b84..22811ec7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 target
-Cargo.lock
+/result*
 
 # wireshark
 *.pcapng
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 00000000..156e34a2
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1900 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "afl"
+version = "0.12.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a914d2e0f713b59acd9b2a85cd2f0b651e2df3ae1ade2bb18c56a97cdb51177"
+dependencies = [
+ "clap",
+ "fs_extra",
+ "libc",
+ "rustc_version 0.4.0",
+ "tempfile",
+ "xdg",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4f55bd91a0978cbfd91c457a164bab8b4001c833b7f323132c0a4e1922dd44e"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "async-trait"
+version = "0.1.58"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e805d94e6b5001b651426cf4cd446b1ab5f319d27bab5c644f61de0a804360c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "atomic-polyfill"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c041a8d9751a520ee19656232a18971f18946a7900f1520ee4400002244dd89"
+dependencies = [
+ "critical-section",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
+name = "bare-metal"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5deb64efa5bd81e31fcd1938615a6d98c82eafcbcd787162b6f63b91d6bac5b3"
+dependencies = [
+ "rustc_version 0.2.3",
+]
+
+[[package]]
+name = "bare-metal"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8fe8f5a8a398345e52358e18ff07cc17a568fbca5c6f73873d3a62056309603"
+
+[[package]]
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+checksum = "349a06037c7bf932dd7e7d1f653678b2038b9ad46a74102f1fc7bd7872678cce"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dcb6dd1c2376d2e096796e234a70e17e94cc2d5d54ff8ce42b28cef1d0d359a4"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46afbd2983a5d5a7bd740ccb198caf5b82f45c40c09c0eed36052d91cb92e719"
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
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+checksum = "69cce20737498f97b993470a6e536b8523f0af7892a4f928cceb1ac5e52ebe7e"
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+
+[[package]]
+name = "bumpalo"
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+
+[[package]]
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+
+[[package]]
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+checksum = "ec8a7b6a70fde80372154c65702f00a0f56f3e1c36abbc6c440484be248856db"
+
+[[package]]
+name = "cc"
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+ "unicode-width",
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+name = "unicode-bidi"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "099b7128301d285f79ddd55b9a83d5e6b9e97c92e0ea0daebee7263e932de992"
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
+
+[[package]]
+name = "unicode-normalization"
+version = "0.1.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c5713f0fc4b5db668a2ac63cdb7bb4469d8c9fed047b1d0292cc7b0ce2ba921"
+dependencies = [
+ "tinyvec",
+]
+
+[[package]]
+name = "unicode-width"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
+
+[[package]]
+name = "url"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d68c799ae75762b8c3fe375feb6600ef5602c883c5d21eb51c09f22b83c4643"
+dependencies = [
+ "form_urlencoded",
+ "idna 0.3.0",
+ "percent-encoding",
+]
+
+[[package]]
+name = "vcell"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77439c1b53d2303b20d9459b1ade71a83c716e3f9c34f3228c00e6f185d6c002"
+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
+name = "void"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+
+[[package]]
+name = "volatile-register"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ee8f19f9d74293faf70901bc20ad067dc1ad390d2cbf1e3f75f721ffee908b6"
+dependencies = [
+ "vcell",
+]
+
+[[package]]
+name = "w5500-dhcp"
+version = "0.4.2"
+dependencies = [
+ "defmt",
+ "dhcproto",
+ "log",
+ "rand_core",
+ "stderrlog",
+ "w5500-hl",
+ "w5500-regsim",
+]
+
+[[package]]
+name = "w5500-dns"
+version = "0.2.0"
+dependencies = [
+ "defmt",
+ "log",
+ "rand_core",
+ "stderrlog",
+ "w5500-hl",
+ "w5500-regsim",
+]
+
+[[package]]
+name = "w5500-fuzz"
+version = "0.1.0"
+dependencies = [
+ "rand_core",
+ "w5500-ll",
+]
+
+[[package]]
+name = "w5500-hl"
+version = "0.9.0"
+dependencies = [
+ "defmt",
+ "embedded-hal 1.0.0-alpha.9",
+ "embedded-hal-mock 0.8.0 (git+https://github.com/dbrgn/embedded-hal-mock?branch=1-alpha)",
+ "w5500-ll",
+]
+
+[[package]]
+name = "w5500-ll"
+version = "0.10.4"
+dependencies = [
+ "defmt",
+ "embedded-hal 0.2.7",
+ "embedded-hal 1.0.0-alpha.9",
+ "embedded-hal-async",
+ "embedded-hal-mock 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "embedded-hal-mock 0.8.0 (git+https://github.com/newAM/embedded-hal-mock?branch=async)",
+ "tokio",
+]
+
+[[package]]
+name = "w5500-mqtt"
+version = "0.1.2"
+dependencies = [
+ "bytes",
+ "defmt",
+ "log",
+ "mqttbytes",
+ "rand_core",
+ "stderrlog",
+ "w5500-hl",
+ "w5500-regsim",
+ "w5500-tls",
+]
+
+[[package]]
+name = "w5500-regsim"
+version = "0.1.0-alpha.8"
+dependencies = [
+ "httparse",
+ "log",
+ "stderrlog",
+ "tokio",
+ "trust-dns-client",
+ "w5500-hl",
+ "w5500-ll",
+]
+
+[[package]]
+name = "w5500-sntp"
+version = "0.2.0"
+dependencies = [
+ "chrono",
+ "defmt",
+ "log",
+ "num-rational",
+ "stderrlog",
+ "time",
+ "w5500-hl",
+ "w5500-regsim",
+]
+
+[[package]]
+name = "w5500-tls"
+version = "0.1.3"
+dependencies = [
+ "bytes",
+ "cfg-if",
+ "defmt",
+ "heapless",
+ "hkdf",
+ "hmac",
+ "log",
+ "mqttbytes",
+ "p256",
+ "p256-cm4",
+ "rand_core",
+ "sha2",
+ "stderrlog",
+ "subtle",
+ "w5500-hl",
+ "w5500-regsim",
+]
+
+[[package]]
+name = "w5500-tls-afl"
+version = "0.0.0"
+dependencies = [
+ "afl",
+ "rand_core",
+ "stderrlog",
+ "w5500-fuzz",
+ "w5500-regsim",
+ "w5500-tls",
+]
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eaf9f5aceeec8be17c128b2e93e031fb8a4d469bb9c4ae2d7dc1888b26887268"
+dependencies = [
+ "cfg-if",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c8ffb332579b0557b52d268b91feab8df3615f265d5270fec2a8c95b17c1142"
+dependencies = [
+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "052be0f94026e6cbc75cdefc9bae13fd6052cdcaf532fa6c45e7ae33a1e6c810"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07bc0c051dc5f23e307b13285f9d75df86bfdf816c5721e573dec1f9b8aa193c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c38c045535d93ec4f0b4defec448e4291638ee608530863b1e2ba115d4fff7f"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows-sys"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a3e1820f08b8513f676f7ab6c1f99ff312fb97b553d30ff4dd86f9f15728aa7"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41d2aa71f6f0cbe00ae5167d90ef3cfe66527d6f613ca78ac8024c3ccab9a19e"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd0f252f5a35cac83d6311b2e795981f5ee6e67eb1f9a7f64eb4500fbc4dcdb4"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fbeae19f6716841636c28d695375df17562ca208b2b7d0dc47635a50ae6c5de7"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84c12f65daa39dd2babe6e442988fc329d6243fdce47d7d2d155b8d874862246"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf7b1b21b5362cbc318f686150e5bcea75ecedc74dd157d874d754a2ca44b0ed"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09d525d2ba30eeb3297665bd434a54297e4170c7f1a44cad4ef58095b4cd2028"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f40009d85759725a34da6d89a94e63d7bdc50a862acf0dbc7c8e488f1edcb6f5"
+
+[[package]]
+name = "xdg"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c4583db5cbd4c4c0303df2d15af80f0539db703fa1c68802d4cbbd2dd0f88f6"
+dependencies = [
+ "dirs",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c394b5bd0c6f669e7275d9c20aa90ae064cb22e75a1cad54e1b34088034b149f"
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000..9945bc30
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,111 @@
+{
+  "nodes": {
+    "crane": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": [
+          "rust-overlay"
+        ]
+      },
+      "locked": {
+        "lastModified": 1668902895,
+        "narHash": "sha256-mfZOjmsPcXyQQ02pEw5B1vpafczopI1JKMx/eovuZ90=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "acbb22591c1335d6d6d241e5f0ef18b206565b58",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1650374568,
+        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1668905981,
+        "narHash": "sha256-RBQa/+9Uk1eFTqIOXBSBezlEbA3v5OkgP+qptQs1OxY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "690ffff026b4e635b46f69002c0f4e81c65dfc2e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "crane": "crane",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1668912095,
+        "narHash": "sha256-3oGeJgeA4+8Wj2XZnbZKJYHoZziyJl36ZGU49I2VC8U=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "5200195aa2a0cef1becc2ba6ff61cba65e1f90fe",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 00000000..d314814e
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,193 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+    flake-utils.url = "github:numtide/flake-utils";
+
+    crane.url = "github:ipetkov/crane";
+    crane.inputs.flake-utils.follows = "flake-utils";
+    crane.inputs.nixpkgs.follows = "nixpkgs";
+    crane.inputs.rust-overlay.follows = "rust-overlay";
+
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    rust-overlay.inputs.flake-utils.follows = "flake-utils";
+    rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    crane,
+    rust-overlay,
+  }:
+    flake-utils.lib.eachSystem [
+      "x86_64-linux"
+      "aarch64-linux"
+    ] (
+      system: let
+        inherit (nixpkgs) lib;
+
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [(import rust-overlay)];
+        };
+
+        workspaceCargoToml = lib.importTOML ./Cargo.toml;
+        testMembers =
+          lib.filter (m: !(lib.hasSuffix "/afl" m) && m != "testsuite")
+          workspaceCargoToml.workspace.members;
+
+        targets = ["thumbv7em-none-eabi" "thumbv6m-none-eabi"];
+
+        craneLib = (crane.mkLib pkgs).overrideToolchain (pkgs.rust-bin.stable.latest.default.override {
+          inherit targets;
+        });
+
+        # https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu.html
+        craneLibNightly = (crane.mkLib pkgs).overrideToolchain (pkgs.rust-bin.nightly."2022-11-12".default.override {
+          inherit targets;
+        });
+
+        src = craneLib.cleanCargoSource ./.;
+
+        cargoToml = {
+          dhcp = lib.importTOML ./dhcp/Cargo.toml;
+          dns = lib.importTOML ./dns/Cargo.toml;
+          fuzz = lib.importTOML ./fuzz/Cargo.toml;
+          hl = lib.importTOML ./hl/Cargo.toml;
+          ll = lib.importTOML ./ll/Cargo.toml;
+          mqtt = lib.importTOML ./mqtt/Cargo.toml;
+          regsim = lib.importTOML ./regsim/Cargo.toml;
+          sntp = lib.importTOML ./sntp/Cargo.toml;
+          testsuite = lib.importTOML ./testsuite/Cargo.toml;
+          tls = lib.importTOML ./tls/Cargo.toml;
+          tls-afl = lib.importTOML ./tls/afl/Cargo.toml;
+        };
+
+        features = with lib;
+          mapAttrs (crate: toml: (sort lessThan (attrNames (toml.features or {})))) cargoToml;
+
+        allFeatures = with lib;
+          sort lessThan (unique (flatten (attrValues features)));
+
+        noStdFeatures = [
+          "defmt"
+          "p256-cm4"
+        ];
+        nightlyFeatures = [
+          "async"
+          "eha0a"
+        ];
+
+        filterNoStdFeatures = lib.filter (m: !(lib.elem m noStdFeatures));
+        mkFeatures = lib.concatStringsSep ",";
+
+        allStdFeatures = mkFeatures (filterNoStdFeatures allFeatures);
+        allStdStableFeatures = mkFeatures (
+          lib.filter (m: !(lib.elem m (noStdFeatures ++ nightlyFeatures))) allFeatures
+        );
+
+        cargoArtifacts = {
+          stdNightly = craneLibNightly.buildDepsOnly {
+            inherit src;
+            cargoExtraArgs = "--features ${allStdFeatures}";
+          };
+          stdStable = craneLib.buildDepsOnly {
+            inherit src;
+            cargoExtraArgs = "--features ${allStdStableFeatures}";
+          };
+          # v6Nightly = craneLibNightly.buildDepsOnly {
+          #   inherit src;
+          #   cargoExtraArgs = "--features ${features}";
+          # };
+          # v6Stable = craneLib.buildDepsOnly {
+          #   inherit src;
+          #   cargoExtraArgs = "--features ${features}";
+          # };
+          # v7Nightly = craneLibNightly.buildDepsOnly {
+          #   inherit src;
+          #   cargoExtraArgs = "--features ${allFeatures}";
+          # };
+          # v7Stable = craneLib.buildDepsOnly {
+          #   inherit src;
+          #   cargoExtraArgs = let
+          #     features = mkFeatures (
+          #       lib.filter (m: !(lib.elem m nightlyFeatures)) allFeatures
+          #     );
+          #   in "--features ${features}";
+          # };
+        };
+      in {
+        packages = {
+          inherit (cargoArtifacts) stdNightly;
+
+          testsuite = craneLib.buildPackage {
+            inherit src;
+            cargoArtifacts = cargoArtifacts.stdNightly;
+            cargoExtraArgs = "-p testsuite";
+          };
+
+          # TODO: check (v6, v7 x std, nightly)
+          # llStable = craneLib.buildPackage {
+          #   inherit src;
+          #   cargoArtifacts = cargoArtifacts.v7Stable;
+          #   cargoExtraArgs = "-p w5500-ll --target thumbv7em-none-eabi";
+          # };
+        };
+
+        checks = let
+          nixSrc = nixpkgs.lib.sources.sourceFilesBySuffices ./. [".nix"];
+
+          tests = lib.listToAttrs (lib.forEach testMembers (p: {
+            name = "test-${p}";
+            value = craneLibNightly.cargoTest {
+              pname = "w5500-${p}";
+              inherit src;
+              cargoArtifacts = cargoArtifacts.stdNightly;
+              cargoExtraArgs = let
+                featuresNoDefmt = mkFeatures (filterNoStdFeatures (lib.getAttr p features));
+                featureArgs =
+                  if featuresNoDefmt != ""
+                  then "--features ${featuresNoDefmt}"
+                  else "";
+              in "-p w5500-${p} ${featureArgs}";
+            };
+          }));
+
+          generatedChecks = tests;
+        in
+          lib.recursiveUpdate generatedChecks
+          {
+            clippy = craneLibNightly.cargoClippy {
+              inherit src;
+              cargoArtifacts = cargoArtifacts.stdNightly;
+              cargoClippyExtraArgs = "--all-features --all-targets -- --deny warnings";
+            };
+
+            rustfmt = craneLibNightly.cargoFmt {inherit src;};
+
+            docs = craneLibNightly.cargoDoc {
+              inherit src;
+              cargoArtifacts = cargoArtifacts.stdNightly;
+
+              RUSTDOCFLAGS = "-D warnings --cfg docsrs";
+
+              cargoExtraArgs = "--all-features";
+            };
+
+            testsuite-build = self.packages.${system}.testsuite;
+
+            alejandra = pkgs.runCommand "alejandra" {} ''
+              ${pkgs.alejandra}/bin/alejandra --check ${nixSrc}
+              touch $out
+            '';
+
+            statix = pkgs.runCommand "statix" {} ''
+              ${pkgs.statix}/bin/statix check ${nixSrc}
+              touch $out
+            '';
+          };
+      }
+    );
+}