Add APRS packet API, codecs, and vector-test foundation

.github/workflows/aprs-vectors.yml

@@ -0,0 +1,25 @@
+name: APRS vector corpus
+on:
+  push:
+    branches: [scaffold/aprs-vectors]
+  pull_request:
+    paths:
+      - "packages/aprs/**"
+      - ".github/workflows/aprs-vectors.yml"
+jobs:
+  source-and-wheel:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: python -m pip install 'pytest>=8,<10' build -e ./packages/aprs
+      - name: Test source including every JSONL vector
+        run: PYTHONPATH=packages/aprs/src python -m pytest packages/aprs/tests -q
+      - name: Build and install wheel
+        run: |
+          python -m build --wheel packages/aprs
+          python -m pip install --force-reinstall --no-deps packages/aprs/dist/*.whl
+      - name: Test installed wheel including every JSONL vector
+        run: python -m pytest packages/aprs/tests -q

README.md

@@ -9,6 +9,15 @@ A collection of useful submodules for HAM Radio. At present, HamKit includes the
 | [hamkit-uls](https://pypi.org/project/hamkit-uls/)                   | ![PyPI - Version](https://img.shields.io/pypi/v/hamkit-uls.svg)          | Tools for working with local copies of the FCC Universal Licensing System database, (e.g., to look up call signs, etc.) |
 | [hamkit-repeaterbook](https://pypi.org/project/hamkit-repeaterbook/) | ![PyPI - Version](https://img.shields.io/pypi/v/hamkit-repeaterbook.svg) | Tools for working with data exported from RepeaterBook (e.g., to save a database of local repeaters, etc.)              |
 
+## In development
+
+- [hamkit-aprs](packages/aprs/README.md): typed APRS parsing, validation and
+  composition foundation, with byte-preserving handling of unsupported payloads.
+  The [packet cookbook](packages/aprs/README.md#find-an-example) shows Python
+  and JSON construction for every modeled family, with wire output where a
+  codec exists; the [coverage matrix](packages/aprs/docs/API_COVERAGE.md)
+  distinguishes models from implemented codecs.
+
 ## License
 
 `hamkit` is distributed under the terms of the [MIT](https://spdx.org/licenses/MIT.html) license.

packages/aprs/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Adam Fourney
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.