Comunicação entre 4 ESP8266 via Roteador Wi-Fi: Conexão Centralizada para IoT | Tutorial Completo

//– Libraries Included ————————————————————–
#include <ESP8266WiFi.h>
//————————————————————————————
// Define I/O Pins
#define LED0 2 // WIFI Module LED
#define LED1 D0 // Indicate Connectivity With Client “For All”
#define LED2 D2 // Connectivity With Cliente 01
#define LED3 D3 // Connectivity With Cliente 02
#define LED4 D5 // Connectivity With Cliente 03
#define MAXSC 4 // MAXIMUM NUMBER OF CLIENTS

//————————————————————————————
// WIFI Module Config
//————————————————————————————
char ssid[] = “FVML”; // SSID of your home WiFi
char pass[] = “fvmlearning”; // password of your home WiFi
String Message; // VARIABLE RECEIVE DATA FROM OTHER CLIENTS

WiFiServer server(80); // THE SERVER AND THE PORT NUMBER
WiFiClient Clients[MAXSC]; // THE SERVER CLIENTS (Devices)

IPAddress ip(192, 168, 25, 240); // IP address of the server
IPAddress gateway(192, 168, 25, 1); // gateway of your network
IPAddress subnet(255, 255, 255, 0); // subnet mask of your network

//====================================================================================
void setup()
{
// Setting The Serial Port
Serial.begin(115200); // Computer Communication
WiFi.config(ip, gateway, subnet); // forces to use the fix IP
WiFi.begin(ssid, pass); // connects to the WiFi router
while (WiFi.status() != WL_CONNECTED) {
Serial.print(“.”);
delay(500);
}

// Setting The Mode Of Pins
pinMode(LED0, OUTPUT); // Setting LED0 Pin Mode Output WIFI OnBorard Led
pinMode(LED1, OUTPUT); // Setting LED1 Pin Mode Output
pinMode(LED2, OUTPUT); // Setting LED2 Pin Mode Output
pinMode(LED3, OUTPUT); // Setting LED3 Pin Mode Output
pinMode(LED4, OUTPUT); // Setting LED4 Pin Mode Output
}

//====================================================================================
void loop()
{
AvailableClients(); // Checking For Available Clients
AvailableMessage(); // Checking For Available Client Messages
}

//====================================================================================

void Availableclient()
{
if (server.hasClient())
{
// Read LED0 Switch To Low If High.
if (digitalRead(LED0) == HIGH) digitalWrite(LED0, LOW);

digitalWrite(LED1, HIGH); // Light Up LED1

for (uint8_t i = 0; i < MAXSC; i++)
{
if (!client[i] || !client[i].connected()) //find free/disconnected spot
{
if (client[i]) // Checks If Previously The Client Is Taken
{
client[i].stop();
}
if (client[i] = server.available()) // Checks If client Connected To The Server
{
Serial.println(“New Client: ” + String(i + 1));
}
continue; // Continue Scanning
}
}

//no free/disconnected spot so reject
WiFiClient client = server.available();
client.stop();
}
else
{
digitalWrite(LED0, HIGH); // This LED Blinks If No client Where Available
delay(250);
digitalWrite(LED0, LOW);
delay(250);
}
}

//====================================================================================

void AvailableMessage()
{
for (uint8_t i = 0; i < MAXSC; i++) //check client for data
{
if (client[i] && client[i].connected() && client[i].available())
{
while (client[i].available())
{
Message = client[i].readStringUntil(‘r’);
client[i].flush();
Serial.println(“Client No ” + String(i + 1) + ” – ” + Message);
ClientNumber();
}
}
}
}

// =================================================================================

void ClientNumber() {

if (Message == “<Cliente 01-1>”) { // Check client number, 01 = client 1, and after trace, status 1 = on, 0 = off
digitalWrite(LED2, HIGH);
} else if (Message == “<Cliente 01-0>”) {
digitalWrite(LED2, LOW);
}

if (Message == “<Cliente 02-1>”) {
digitalWrite(LED3, HIGH);
} else if (Message == “<Cliente 02-0>”) {
digitalWrite(LED3, LOW);
}

if (Message == “<Cliente 03-1>”) {
digitalWrite(LED4, HIGH);
} else if (Message == “<Cliente 03-0>”) {
digitalWrite(LED4, LOW);
}
}

//======================================== www.fvml.com.br ================================================

//————————————————————————————
// Libraries Needed For This Project
//————————————————————————————
#include <ESP8266WiFi.h> // The Basic Function Of The ESP NOD MCU
//————————————————————————————
// Defining I/O Pins
//————————————————————————————
#define LED0 2 // WIFI Module LED
#define LED1 D0 // Indicate Connectivity With Client #1
#define BUTTON D1 // Connectivity ReInitiate Button

//————————————————————————————
// WIFI Authentication Variables
//————————————————————————————
char ssid[] = “FVML”; // SSID of your home WiFi
char pass[] = “fvmlearning”; // password of your home WiFi
const String ClientID = “Cliente 01”; // Client Identification
//————————————————————————————
// WIFI Module Mode & IP
//————————————————————————————
IPAddress server(192, 168, 25, 240); // the fix IP address of the server
WiFiClient client;

//====================================================================================
void setup()
{
Serial.begin(115200); // Setting the Serial Port – Computer Communication
pinMode(LED0, OUTPUT); // Setting the Mode of Pins WIFI OnBoard LED Light
pinMode(LED1, OUTPUT); // Setting the Mode of LED1 output
pinMode(BUTTON, INPUT_PULLUP); // Setting the Mode of Pins Button as Input PullUp
digitalWrite(LED0, HIGH); // Setting WiFi LED Off

WiFi.begin(ssid, pass); // connects to the WiFi router
if (WiFi.status() == WL_CONNECTED)
{
WiFi.disconnect();
WiFi.mode(WIFI_OFF);
delay(50);
}

CheckWiFiConnectivity(); // Checking For Connection

digitalWrite(LED0, LOW); // Stop Blinking To Indicate Connected
Serial.println(“Client Device Connected”);

Printing IP Address ————————————————–
Serial.println(“Connected To : ” + String(WiFi.SSID()));
Serial.println(“Signal Strenght : ” + String(WiFi.RSSI()) + ” dBm”);
Serial.print (“Server IP Address : “);
Serial.println(client);
Serial.print (“Server Port Num : “);
Serial.print (“Device MC Address : “); // Printing MAC Address
Serial.println(String(WiFi.macAddress()));
Serial.print (“Device IP Address : “); // Printing IP Address
Serial.println(WiFi.localIP());

ESPRequest(); // Conecting The Device As A Client
}

//====================================================================================

void loop()
{
ReadButton();
}

//====================================================================================

void ReadButton() // Reading Button Function
{
int reading = digitalRead(BUTTON);
if (reading == LOW)
{
int LEDState = !digitalRead(LED1);
digitalWrite(LED1, LEDState);
Serial.println (“<” + ClientID + “-” + LEDState + “>”);
client.println (“<” + ClientID + “-” + LEDState + “>”);
client.flush();
} delay(300);
}

//====================================================================================

void CheckWiFiConnectivity()
{
Serial.print(“Connecting”);
while (WiFi.status() != WL_CONNECTED)
{
digitalWrite(LED0, !HIGH);
delay(250);
digitalWrite(LED0, !LOW);
delay(250);
Serial.print(“.”);
}
}

void ESPRequest()
{
client.stop(); // First Make Sure You Got Disconnected
if (client.connect(server, 80)); // Connection to the server
{
Serial.println (“<” + ClientID + “- CONNECTED>”);
client.println (“<” + ClientID + “- CONNECTED>”); //If Sucessfully Connected Send Connection Message
client.flush();
}
}

//=================================== www.fvml.com.br ===============================================