Publish an Event with ESP8266 via Wia's MQTT API

In this tutorial, we’ll go through setting up an ESP8266 board, and publishing an Event to Wia via our MQTT API.

Connecting the board
Note: If your board has a micro USB port, you can probably skip this step.

Connect your board to laptop/desktop via a USB to TTL cable/adapter. Here’s a pinout showing the different connections.”

Link