feat(oot): support external MAVLink handler, stream, and dialect with opt in custom init scripts in Out of Tree modules#27415

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methodmissing wants to merge 10 commits into

methodmissing:external-mods-flex

Commits on May 19, 2026

mavlink: add external handler and stream registries for out-of-tree MAVLink dialect support
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cmake: add mavlink/ directory convention for external module MAVLink dialects
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Add support for rate intervals
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Use mutex in mavlink_ext_handler_register
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Add mavlink_ext_stream_set_interval and use mutex in ext_stream
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Prefer explicit shared cmake function px4_add_external_mavlink_dialect
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Introduce support for optional external module auto-start / init scripts
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Add documentation relevant to OOT support for startup sequence and MAVLink dialect registration and handling
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Cleanups
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Reverse boot order so that logging has precedence over OOT module inits
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