Requirement

Software Tools

ESP-IDF for ESP32

Hardware Components

ESP WROOM32
SIMCOM A7672S
SIMACARD

ESP-IDF Development Environment Changes

Replace the esp_https_ota.c & esp_https_ota.h components file (your local development environment) with the files given in folder idf_internal_file.
Location of the file (esp_https_ota.c): C:\ own esp working directory \components\esp_https_ota\src\esp_https_ota.c.
Location of the file (esp_https_ota.h) : C:\ own esp working directory \components\esp_https_ota\includes\esp_https_ota.h.

Hardware Interfacing

GPIO 17 (ESP) : UART TX (A7627S)
GPIO 16 : UART RX
GPIO 32 : ENABLE

Uploaded Firmware File Cloud URL

replace the Firmware File URL (Where the bin file is stored) in simcom.c file with your cloud URL
Example : https://www.mosquitto.com/beta/iot/blink.bin