LoRa is a 'Long Range' low power wireless standard intended for providing a cellular style low data rate communications network. LoRa is ideal for providing intermittent low data rate connectivity over significant distances. 

LoRa is a wireless modulation technique derived from Chirp Spread Spectrum (CSS)

 technology. It encodes information on radio waves using chirp pulses - similar to the way dolphins and bats communicate! LoRa modulated transmission is robust against disturbances and can be received across great distances.

Few awesome features of LoRa communication:

• Ultra low power - LoRaWAN end devices are optimized to operate in low power mode and can last up to 10 years on a single coin cell battery.
• Long range - LoRaWAN gateways can transmit and receive signals over a distance of over 10 kilometers in rural areas and up to 3 kilometers in dense urban areas.
• Deep indoor penetration - LoRaWAN networks can provide deep indoor coverage, and easily cover multi floor buildings.

Interfacing with ESP32:

The LoRa module has been connected to ESP32 through the SPI protocol.

Deep Shutdown of LoRa:

I have added a power switch circuit by using a MOSFET ( Q2)  and transistor ( Q1 )for complete shut down of the LoRa module during the sleep mode.