• Follow the Arduino Cli documentation to install arduino-cli tool.

• Add esp8266 repo to the index

arduino-cli core update-index --additional-urls https://arduino.esp8266.com/stable/package_esp8266com_index.json

• Install esp8266 generic board

arduino-cli board install esp8266:esp8266:generic

Compile:

arduino-cli compile --fqbn esp8266:esp8266:generic <path-to-folder>

Upload:

arduino-cli upload -p <usb-link> --fqbn esp8266:esp8266:generic <path-to-folder>

Set permissions to usb-link:

sudo chmod a+rw /dev/ttyUSB0

• base - Basic Example (serial monitor);
• http - Simple JSON HTTP GET / POST requests via WiFi module (ESP8266);
• mqtt - Simple MQTT Publisher (IoT Device) / Consumer (NodeJS app) via WiFi module (ESP8266);
• mq9_sensor - MQ9 Gas sensor data to AWS Lambda > DynamoDB > Telegram Bot Alert;

LED_BUILTIN = blue LED
0 = D3
1 = TX
2 = blue LED
3 = RX
4 = D2
5 = D1
12 = D6
13 = D7
14 = D5
15 = D8
16 = D0