The ESP should NOT connect to WiFi for this purpose . (Battery)
Like this: Wake up by trigger -> check the lenght of the deepsleep
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Moderator: igrr
Pseudo code:
Get current date/time
Write to EEPROM
Go to deep sleep
...
Wake up
Get current date/time // Get it from where if no WiFi connection ?
Retrieve stored date/time from EEPROM
Subtract the two values: result is actual time spawn
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