Sending IoT Sensor Data to Public or Private Servers

This IoT system shows a simple and effective way to send sensor data using an ESP8266 microchip.

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Modern IoT systems rely on sensors to collect real-world data and transmit it to public cloud servers or private on-premises servers for monitoring, analytics, and decision-making. Here's the core working logic of an ESP8266-based IoT node that reads temperature and humidity data and sends it securely to a remote server while also exposing the data locally.

Overview of the system architecture

The code implements a hybrid, dual-mode architecture for an IoT device (like an ESP8266 microcontroller) designed for maximum flexibility in different scenarios. The system doesn't just do one thing; it intelligently operates in two distinct modes, making it useful both when connected to the internet and when operating locally.

Remote data push (Client mode):

Sensor data is periodically sent to a private/public server using HTTP POST (JSON format). This is ideal for cloud dashboards, databases, or analytics pipelines.

Local data access (Server mode):

ESP8266 runs a lightweight web server. Nearby devices can fetch live sensor data directly using a browser or REST call.

This hybrid model is commonly used in smart homes, industrial monitoring, and edge computing systems.

We will now see how this IoT system works.

Library and hardware abstraction is as follows:

#include <ESP8266WiFi.h>

#include <ESP8266HTTPClient.h>

#include <WiFiClient.h>

#include "DHT.h"

These libraries provide:

• WiFi connectivity (ESP8266WiFi)

• HTTP communication (ESP8266HTTPClient)

• Low-level TCP client support (WiFiClient)