Short demo of how to instantly turn your ESP8266 module into a webserver for polling values from an IoT Gateway

gistfile1.txt

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>

const char* DeviceId = "<<your sensor id>>";
const char* WIFI_SSID = "<<your wifi SSID>>";
const char* WIFI_SECRET = "<<your wifi password>>";

ESP8266WebServer webServer(80);

void setup()
{
	Serial.begin(9600);

	InitWifi();

	InitWebServer();
}


void loop() {
	webServer.handleClient();
}


void InitWebServer()
{
	webServer.on("/", []()
	{
		Serial.println("GET request received for root URL");
		webServer.send(200, "text/plain", "Hello world");
	});

	webServer.on("/temperature", []()
	{
		// Get sensor telemetry, package it as JSON and send it. This gist only displays a mock 
		webServer.send(200, "application/json", "{\"Temperature\" : 25.7 }");
	});

	webServer.begin();
}


void InitWifi()
{
	Serial.println("Connecting to wifi");

	WiFi.begin(WIFI_SSID, WIFI_SECRET);
	while (!WiFi.isConnected())
	{
		delay(500);
		Serial.print(".");
	}
	Serial.print("Connected to wifi on: ");
	Serial.println(WiFi.localIP());
}