Setup MQTT broker server on Raspberry Pi

1. Update raspberry pi

   sudo apt update

2. Install mosquitto broker and client

   sudo apt install mosquitto mosquitto-clients

3. Set mosquitto broker server to auto start after reboot.

   sudo systemctl enable mosquitto.service

Setup ESP8266 as MQTT client (with Micro Python)

1. Upgarding the pip

   python -m pip install --upgrade pip

2. Installing esptool and adafruit-ampy

   pip install esptool

   pip install adafruit-ampy

3. Downloding the latest MicroPython firmware (.bin file) from https://micropython.org/download/esp8266

4. Connect the ESP8266 device to computer and check the port (COM3 - for windows)

5. Open command prompt and using esptool.py erase the exiting firmware from flash memory of esp8266.

   esptool.py --port COM3 erase_flash

6. write the downloaded firmware to esp8266

   esptool.py --port COM3 write_flash --flash_size=detect 0 D:\ESP8266\esp8266-20210902-v1.17.bin

7. Use ampy to check the file system or transfer new python file to esp8266

   ampy -p COM3 ls -l ----> To list down all the existing files from esp8266

   ampy -p COM3 get [SOURCE_FILE_NAME] [DESTINATION_FILE_NAME] ---> Copy file from esp8266 to local machine

   ampy -p COM3 put [FILE_NAME_WITH_PATH] ----> copy file to esp8266