arduino

/*
 * Connects the ESP8266 NodeMCU board to wifi and prints the IP address.
 * Accept a client and simulate a ph detection
 * sending data to the client in JSON format.
 */

#include "ESP8266WiFi.h"

// WiFi parameters to be configured
const char* ssid = "router_username"; // Write here your router's username
const char* password = "router_password"; // Write here your router's passward
const int serverPort = 8888;
WiFiServer server(serverPort);

void setup(void)
{ 
  Serial.begin(9600);
  // Connect to WiFi
  WiFi.begin(ssid, password);

  // while wifi not connected yet, print '.'
  // then after it connected, get out of the loop
  while (WiFi.status() != WL_CONNECTED) {
     delay(500);
     Serial.print(".");
  }
  //print a new line, then print WiFi connected and the IP address
  Serial.println("");
  Serial.println("WiFi connected");
  // Print the IP address
  Serial.println(WiFi.localIP());
  startServer(serverPort);
  
}
void loop() {
  // prova
WiFiClient client = server.available();
  if (client) {
    Serial.println("Client connected");
    while (client.connected()) {
      double phValue; 
      randomSeed(millis());
      phValue = random(0,15);
      
      String jsonData = "{\"ph\": " + String(phValue) + "}";
      Serial.println("detected data: "+jsonData);
      // Invia i dati al client
      client.println(jsonData);
      client.flush();
      
      delay(1000);
    }
    Serial.println("Client disconnected");
  }
 
}

void startServer(int port){
  server.begin();
  Serial.println("Server started");
}