Is there a way where we can do wifi to serial communication between phone and esp32?
thw ESP32 has onboard WiFi, Bluetooth Classic 2.0 and BLE
if the ESP32 is in WiFi area with internet support the phone can contact the ESP32 to access webservers, FTP, etc the ESP32 could send emails which the phone could pick up, etc
Try running example programs on ESP32 to get some idea of its capabilities then draw up a specification of what you require
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