Add SNTP-synced system time#25
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Settings for saving wifi creds, enable auto-connect. Also fix TLS on Zephyr v4.3.0 at least (PSA might work better on v4.4 dev?), by disabling PSA.
Periodically check if the Wi-Fi connection is down, but should be up: - run a scan - if an SSID is in scan results and is in stored Wi-Fi credentials, and Wi-Fi is not connected, start a watchdog timeout - if the timeout elapses, reboot with a custom reboot reason (in the "expected" classification, so this does not impact stability score) Also add a new custom metric `wifi_scan_result_count_max`, just for curiousity.
Surprisingly involve TBH, but it works! Tested on ESP32-C6 only for now.
Also add re-triggering wifi connect if not connected, makes the connection stay up much more reliably.
gminn
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| //! - On every SNTP sync, a (unix_sec, counter_ticks) anchor is written into a | ||
| //! struct placed in RTC slow RAM via RTC_NOINIT_ATTR (esp_attr.h section | ||
| //! ".rtc_noinit"). RTC slow RAM is a separate hardware region that is NOT | ||
| //! cleared on soft resets, and is not part of the .data/.bss segment, so it | ||
| //! is immune to FOTA updates changing the main RAM layout. |
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very cool that we can take advantage of this
| MEMFAULT_METRICS_KEY_DEFINE(wifi_scan_result_count_max, kMemfaultMetricType_Unsigned) | ||
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| // Number of successful SNTP time synchronizations in this heartbeat period | ||
| MEMFAULT_METRICS_KEY_DEFINE(sntp_sync_count, kMemfaultMetricType_Unsigned) |
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nit: sntp_sync_successful_count would be a bit more specific here (granted, I might not think this if I wasn't biased with sync_success/ sync_failure device vitals 😅)
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Also add re-triggering wifi connect if not connected, makes the connection stay up much more reliably.