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Nodemcu can't reconnect when the wifi router turns off and turns on again

When the power is off and back on again, the wifi router and nodemcu will turn on at the same time but the wifi router will take at least 30 seconds to normalize but nodemcu can’t reconnect when the wifi router turns off and turns on again.
nodemcu have to wait for the wifi router to turn on normally again to connect … how to solve it if we were out of town? Thank You

Note : I am using a nodemcu based module with a mains charger adapter ( am also using Wifi manager to sync wifi to setup before)