Add JSON packet recording option to native

[jp-bennett]

Add an option to dump decoded packets to a local file, in JSON format.

[Copilot]

Pull request overview

This PR adds a new feature to the Portduino (native) platform that allows decoded mesh packets to be recorded to a local JSON file. Users can configure a file path and optionally filter packets by port number (e.g., only save position, telemetry, or text message packets).

• Adds JSONFile and JSONFilter configuration options to the YAML config
• Implements file opening and packet writing logic for JSON recording
• Supports filtering by packet type using port number enums

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 4 comments.

File	Description
src/platform/portduino/PortduinoGlue.h	Adds extern declaration for JSONFile stream, new config fields (JSONFilename and JSONFilter), and YAML serialization logic for the new config options
src/platform/portduino/PortduinoGlue.cpp	Implements file opening logic for JSONFile with error handling, and config parsing with string-to-enum conversion for filter values
src/mesh/Router.cpp	Adds packet recording logic in the decode path that writes JSON-serialized packets to the file when filtering criteria are met
bin/config-dist.yaml	Documents the new JSONFile and JSONFilter configuration options with example usage

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[mdecourcy]

Should we handle log rotation/expiry?

[jp-bennett]

Should we handle log rotation/expiry?

That would be a nice addition, yes. I think this could be merged without it, but some features around that idea would be nice. I even considered adding a way to get the timestamp in the file name.