[proposal] mavactive: util to send heartbeats in the background#577

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ES-Alexander wants to merge 4 commits intoArduPilot:masterfrom

ES-Alexander:mavactive

Commits on Aug 13, 2021

Create mavactive.py
ES-Alexander
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Commits on Aug 15, 2021

mavactive: add write lock to make thread-safe
ES-Alexander
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Commits on Oct 26, 2021

mavactive: make daemon to handle sudden exit
ES-Alexander
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Commits on Jun 11, 2022

mavactive: change `__del__` to `weakref.finalize`
ES-Alexander
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