I connected as follow:
Vcc, EN, port --- to 3.3V of Mega 2560
GND port --------- to GND of Mega 2560
Tx ------------------- to Rx of Mega 2560
Rx ------------------- to Tx of Mega 2560
After connection, I have checked using Voltmeter between Vcc and GND port on ESP-07 module showed approx. 0.3V instead, and the LED on ESP-07 is not lighting up. Anyone please help?