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Shelly Pro 3 w/ fw 1.2.2 incorrect calculation for the offset when the scheduled on-time crosses midnight.

Evgeny

By Evgeny
in BUG REPORTS

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Evgeny Newbie

Evgeny

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Device: Shelly Pro 3
Firmware: 20240223-142037/1.2.2-g7c39781
Schedule: Turn ON, after Sunset with offset of 1h 20m

Problem: 

The device incorrectly calculates the scheduled on-time when the sunset occurs close to midnight.

  • Expected behavior:

    • On June 30, 2024, sunset was at 22:40. The relay should have turned on at 00:00 on July 1, 2024.
    • On July 1, 2024, sunset was at 22:39. The relay should have turned on at 23:59 on July 1, 2024.

  • Actual behavior:

    • The relay incorrectly skipped a cycle from June 30 and turned on at 23:59 on July 1, 2024 only.

Root cause:

It appears the device uses an incorrect calculation for the offset when the scheduled on-time crosses midnight.

Additional notes:

  • A similar issue might occur with Sunrise schedules when using negative offsets.
  • This issue is likely to occur in regions with long daylight hours.


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