Hi guys,
I've ask Quectel support about reset signal (active low) on EC21 and this was 
the answer:
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R&D said that if the reset low time is more than 480ms, the module will reset 
again.
We suggest use PERST# only when failed to turn off the module by AT+QPOWD 
command and PWRKEY pin for protecting the internal flash. The fewer reset times 
of the module, the better.

So we suggest the reset low time to be no more than 460ms and 20ms margin 
reserved.
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