We’ve been using a solar powered solution with an ESP32-S3 for tank level monitoring. We wake up every hour and take a reading, transmit it, and go back to sleep. The Notecard is in minimum mode and we haven’t had issues.
As mentioned above, Notecard ATTN line is connected to an ESP32-S3 input programmed to wake up the ESp32-S3.
In this thread Low-power "mode":"minimum" example? I included some of our code to demonstrate how it works.
Karl