Hacklab: Burglar alarm - Part 3 - Adding SMS capabilities using SIM800L module

This video continues on where part 2 left off. I wanted to add SMS capabilities to the burglary alarm. The idea was that I should be able to arm or disarm the device remotely using SMS messages. In addition, the device should send me an alert message if the device is armed and any of the sensors gets triggered. I had to make some modifications to the previous version. First of all, I had to change the communication with ESP8266 as two-way communication so that SMS status change can be updated to the ESP82