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Arduino Library (AT): https://github.com/OpenDevice/ESP8266AT

Introduction

This guide will show you how to connect (WiFi) devices in the OpenDevice server and send data to save in storage and further visualization in dashboards, all in real time. 

We will use the DHT22 sensor connected to the WiFi ESP8266 module to collect temperature and humidity, and send the server using the MQTT protocol.

Prerequisites

• OpenDevice server up and running (guide)
• Arduino IDE
• ESP8266 module (like NodeMCU)
• DHT22 sensor

Wiring

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Examples:
https://github.com/OpenDevice/opendevice-lib-arduino/tree/master/examples/ESP8266WiFi
https://github.com/OpenDevice/opendevice-lib-arduino/tree/master/examples/ESP8266WiFi_AT

Device Code (Firmware)

The application that is running on ESP8266 is written using Arduino SDK which is quite simple and easy to understand.

Features:

• AT Firmware and Stand-alone mode
• Auto-Discovery
• Remote wifi config
• Remote Update

Recommended Resources:

• ESP8266 Troubleshooting Guide
• Getting Started Guide for the ESP8266 WiFi Module
• How to Install the ESP8266 Board in Arduino IDE
• DHT11/DHT22 Humidity and Temperature Sensor With Arduino