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J. Nick Koston
a28a6f7d93
The update task runs in a FreeRTOS thread on ESP32 and was writing directly to update_info_ std::string fields while the main loop reads them via API (as StringRef pointers into the string buffer), MQTT, web server, and Prometheus. This is undefined behavior that can cause use-after-free crashes when a string reallocation invalidates a StringRef held by the API serialization path. Move all update_info_ and state_ writes into the existing defer() callback so they execute on the main loop. The task now accumulates results in a local UpdateInfo struct and moves it into update_info_ in the deferred callback, eliminating the cross-thread data race with zero steady-state memory overhead.