ESP32-S3 deep_sleep with E220

I have recently been using ESP32-S3 which communicates with E220. I noticed that when I put the modem in sleep mode and in deepSleep ESP32, when a message arrives, the MCU wakes up via the AUX pin, I create the E220ttl object and I go to read the buffer but it doesn't find anything. It seems that when I create the object the buffer of HardwareSerial1 (the one I use) is cleared. Is there a better way to wake up ESP32 and read the message that has arrived? Have you done any driving? I did not find her Thank you