Validate RTCM from UDP before forwarding

[Ryanf55]

Description

The new UDP input option for RTCM data currently takes raw datagrams and sends them raw via MAVLink to the drone.
The NTRIP caster currently validates incoming RTCM data as RTCM. Now, we reuse the RTCM parser to optionally validate the incoming UDP stream. I enable validation by default.

Along the way, I added some more tests after having claude compare implementations between this and PX4.
Claude found no issues with either RTCM parser implementation.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactoring (no functional changes)
• CI/Build changes
• Other

Testing

• Tested locally
• Added/updated unit tests
• [] Tested with simulator (SITL)
• Tested with hardware

Tested on FreeFly AltaX with validation enabled and disabled to make sure both still work.

Platforms Tested

• Linux
• Windows
• macOS
• Android
• iOS

Flight Stacks Tested

• PX4
• ArduPilot

Screenshots

Here are the debug log messages with validation enabled:

And with validation disabled

Both result in RTK fix.

Checklist

• I have read the Contribution Guidelines
• I have read the Code of Conduct
• My code follows the project's coding standards
• I have added tests that prove my fix/feature works
• New and existing unit tests pass locally

Related Issues

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By submitting this pull request, I confirm that my contribution is made under the terms of the project's dual license (Apache 2.0 and GPL v3).

[codecov]

Codecov Report

❌ Patch coverage is 4.87805% with 39 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@b59e589). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/GPS/NTRIP/RTCMUdpInput.cc	0.00%	36 Missing ⚠️
src/GPS/NTRIP/NTRIPManager.cc	50.00%	0 Missing and 1 partial ⚠️
src/GPS/NTRIP/RTCMUdpInput.h	50.00%	1 Missing ⚠️
src/Settings/NTRIPSettings.cc	0.00%	0 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (4.87%) is below the target coverage (30.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #14379   +/-   ##
=========================================
  Coverage          ?   25.34%           
=========================================
  Files             ?      769           
  Lines             ?    65948           
  Branches          ?    30515           
=========================================
  Hits              ?    16714           
  Misses            ?    37448           
  Partials          ?    11786           

Flag	Coverage Δ
unittests	25.34% <4.87%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/GPS/NTRIP/RTCMParser.h	100.00% <ø> (ø)
src/GPS/NTRIP/NTRIPManager.cc	8.96% <50.00%> (ø)
src/GPS/NTRIP/RTCMUdpInput.h	33.33% <50.00%> (ø)
src/Settings/NTRIPSettings.cc	0.00% <0.00%> (ø)
src/GPS/NTRIP/RTCMUdpInput.cc	10.84% <0.00%> (ø)

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[github-actions]

Build Results

Platform Status

Platform	Status	Details
Linux	Passed	View
Windows	Passed	View
MacOS	Passed	View
Android	Failed	View

Some builds failed.

Pre-commit

Check	Status	Details
pre-commit	Failed (non-blocking)	View

Pre-commit hooks: 4 passed, 45 failed, 7 skipped.

Test Results

linux-coverage: 90 passed, 0 skipped
Total: 90 passed, 0 skipped

Code Coverage

Coverage	Baseline	Change
59.2%	59.2%	-0.0%

Artifact Sizes

Artifact	Size	Δ from master
QGroundControl	216.88 MB	-4.60 MB (decrease)
QGroundControl-aarch64	176.78 MB	+0.00 MB (increase)
QGroundControl-installer-AMD64	134.72 MB	+0.01 MB (increase)
QGroundControl-installer-AMD64-ARM64	77.33 MB	+0.01 MB (increase)
QGroundControl-installer-ARM64	106.05 MB	-0.01 MB (decrease)
QGroundControl-x86_64	171.96 MB	-0.44 MB (decrease)
Total size decreased by 5.02 MB

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_{Updated: 2026-05-15 00:18:37 UTC • Triggered by: Android}