Come comunicare tramite TCP/IP con ESP32 server #4.2

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Nell’articolo di oggi vedremo come utilizzare ESP32 come server e comunicare con esso tramite un PC (in particolar modo con Arduino IDE) tramite il protocollo TCP-IP.

Nell’articolo precedente abbiamo parlato del protocollo TCP/IP, riprendiamo brevemente tale concetto.

TCP/IP è un protocollo di collegamento dati utilizzato in Internet per consentire a computer e altri dispositivi di inviare e ricevere dati. TCP/IP sta per Transmission Control Protocol/Internet Protocol, cioè un sistema che consente ai dispositivi connessi a Internet di comunicare tra loro attraverso le reti.

Cosa fare con ESP32

Installare processing dal seguente link https://processing.org/download/.

Estrarre la cartella compressa e cliccare su “processing.exe” come mostrato nell’immagine sottostante.

Una volta aperta l’applicazione andare su:

Sketch
Import Library
Add library
ricercare ControlP5

Codice

Prima di compilare e caricare il codice dobbiamo cambiare i valori di:

Ssid_router: inserendo il nome del nostro router
password_router: inserendo la password del router

#include <WiFi.h>

#define port 80
const char *ssid_Router      = "insertname";  //input your wifi name
const char *password_Router  = "insertPw";  //input your wifi passwords
WiFiServer  server(port);

void setup()
{
    Serial.begin(115200);
    Serial.printf("\nConnecting to ");
    Serial.println(ssid_Router);
    WiFi.disconnect();
    WiFi.begin(ssid_Router, password_Router);
    delay(1000);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("");
    Serial.println("WiFi connected.");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());			
    Serial.printf("IP port: %d\n",port);			
    server.begin(port);								
    WiFi.setAutoConnect(true);
    WiFi.setAutoReconnect(true);
}

void loop(){
 WiFiClient client = server.available();            // listen for incoming clients
  if (client) {                                     // if you get a client,
    Serial.println("Client connected.");
    while (client.connected()) {                    // loop while the client's connected
      if (client.available()) {                     // if there's bytes to read from the client,
        Serial.println(client.readStringUntil('\n')); // print it out the serial monitor
        while(client.read()>0);                     // clear the wifi receive area cache
      }
      if(Serial.available()){                       // if there's bytes to read from the serial monitor,
        client.print(Serial.readStringUntil('\n')); // print it out the client.
        while(Serial.read()>0);                     // clear the wifi receive area cache
      }
    }
    client.stop();                                  // stop the client connecting.
    Serial.println("Client Disconnected.");
  }
}

#include <WiFi.h>

#define port 80

const char *ssid_Router = "insertname"; //input your wifi name

const char *password_Router = "insertPw"; //input your wifi passwords

WiFiServer server(port);

void setup()

{

Serial.begin(115200);

Serial.printf("\nConnecting to ");

Serial.println(ssid_Router);

WiFi.disconnect();

WiFi.begin(ssid_Router, password_Router);

delay(1000);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

Serial.println("");

Serial.println("WiFi connected.");

Serial.print("IP address: ");

Serial.println(WiFi.localIP());

Serial.printf("IP port: %d\n",port);

server.begin(port);

WiFi.setAutoConnect(true);

WiFi.setAutoReconnect(true);

}

void loop(){

WiFiClient client = server.available(); // listen for incoming clients

if (client) { // if you get a client,

Serial.println("Client connected.");

while (client.connected()) { // loop while the client's connected

if (client.available()) { // if there's bytes to read from the client,

Serial.println(client.readStringUntil('\n')); // print it out the serial monitor

while(client.read()>0); // clear the wifi receive area cache

}

if(Serial.available()){ // if there's bytes to read from the serial monitor,

client.print(Serial.readStringUntil('\n')); // print it out the client.

while(Serial.read()>0); // clear the wifi receive area cache

}

client.stop(); // stop the client connecting.

Serial.println("Client Disconnected.");

}

Compila e carica il codice sulla scheda. Una volta eseguita tale operazione aprire il monitor seriale e impostare il baud rate a 115200. Osserviamo qual è l’indirizzo IP del nostro router.

Se si hanno problemi prova a riavviare la scheda tramite l’apposito pulsante.

Apriamo processing e copiamo e incolliamo il seguente codice.

import controlP5.*;
import processing.net.*;

ControlP5 cp5;
//Println console;
Server myServer;
Client myClient;
int dataIn=0;
int radioFlag1=0;
int radioFlag2=0;
int send_flag=1;

void setup() {
    size(600,400);
    smooth();
    noStroke();
    cp5 = new ControlP5(this);
    cp5.addTab("default")
       .activateEvent(true)
       .setHeight(30)
       .setWidth(100)
       .setLabel("TCP Server")
       .setId(1)
       ;
    cp5.getTab("TCP Client")
       .activateEvent(true)  
       .setHeight(30)
       .setWidth(100)
       .setId(2)  
       ;
 
    cp5.addTextfield("Local IP")
       .setPosition(20,40)                               
       .setSize(160,40)
       .setFont(createFont("微软雅黑 Light",20))
       .setColor(color(255,255,0))
       .setColorLabel(color(0))
       .setColorBackground(color(100,255))
       .moveTo("default")
       ;
    cp5.addTextfield("Local PORT")
       .setPosition(20,120)                            
       .setSize(160,40)
       .setFont(createFont("微软雅黑 Light",20))
       .setColor(color(255,255,0))
       .setColorLabel(color(0))
       .setColorBackground(color(100,255))
       .setText("8888")
       .moveTo("default")
       ;
    cp5.addRadioButton("connect1")
       .setPosition(20,200)                    
       .setSize(100,25)
       .addItem("Listening", 1)
       .setColorLabel(color(0))
       .moveTo("default")
       ;

    cp5.addTextfield("Remote IP")
       .setPosition(20,40)                               
       .setSize(160,40)
       .setFont(createFont("微软雅黑 Light",20))
       .setColor(color(255,255,0))
       .setColorLabel(color(0))
       .setColorBackground(color(100,255))
       .setText("192.168.1.xxx")
       .moveTo("TCP Client")
       ;
    cp5.addTextfield("Remote PORT")
       .setPosition(20,120)                            
       .setSize(160,40)
       .setFont(createFont("微软雅黑 Light",20))
       .setColor(color(255,255,0))
       .setColorLabel(color(0))
       .setColorBackground(color(100,255))
       .setText("80")
       .moveTo("TCP Client")
       ;
    cp5.addRadioButton("connect2")
       .setPosition(20,200)                  
       .setSize(100,25)
       .addItem("connect Server",1)
       .setColorLabel(color(0))
       .moveTo("TCP Client")
       ;

    cp5.addTextarea("recvData")
        .setPosition(200,40)
        .setSize(350,150)
        .setFont(createFont("微软雅黑 Light",20))
        .setColor(color(255,255,0))
        .setColorBackground(color(100,255))
        .scroll(15)
        .setColorForeground(color(0,100))
        .moveTo("global")
        ;
     cp5.addTextfield("sendData")
        .setPosition(200,230)                            
        .setSize(350,80)
        .setFont(createFont("微软雅黑 Light",20))
        .setColor(color(255,255,0))
        .setLabel("")
        .setFocus(true)
        .setColorBackground(color(100,255))
        .setColorForeground(color(0,100))
        .moveTo("global")
       ;
     cp5.addButton("clearRecv")
        .setValue(0)
        .setPosition(200,200)
        .setSize(100,20)
        .setColorLabel(color(255,100))
        .moveTo("global")
        ;
     cp5.addButton("clearSend")
        .setValue(0)
        .setPosition(200,320)
        .setSize(100,20)
        .setColorLabel(color(255,100))
        .moveTo("global")
        ;
     cp5.addButton("Send")
        .setValue(0)
        .setPosition(450,320)
        .setSize(100,20)
        .plugTo(this,"send_Textfield_SendData")
        .setColorLabel(color(255,100))
        .moveTo("global")
        ;
     cp5.get(Textfield.class,"Local IP").setText(Server.ip());
}

void draw(){
  background(220);
  if(radioFlag1==1){
    Client thisClient = myServer.available();
    if (thisClient !=null) {
      String whatClientSaid = thisClient.readString();
      if (whatClientSaid != null) {
        cp5.get(Textarea.class,"recvData").append(thisClient.ip()+":  ");
        cp5.get(Textarea.class,"recvData").append(whatClientSaid+"\n");
      } 
    }
    
  }
 // myServer.active()
  if(radioFlag2==1){
    if (myClient.available() > 0) {
      String whatClientSaid = myClient.readString();
      if (whatClientSaid != null) {
        cp5.get(Textarea.class,"recvData").append(cp5.get(Textfield.class,"Remote IP").getText()+":  ");
        cp5.get(Textarea.class,"recvData").append(whatClientSaid+"\n");
      } 
    } 
  }
}

void controlEvent(ControlEvent theControlEvent) {
  if (theControlEvent.isTab()) {
    if(theControlEvent.getTab().getId()==1){
      cp5.get(Textarea.class,"recvData").clear();
      cp5.get(Textfield.class,"sendData").clear();
      send_flag=1;
    }
    else if(theControlEvent.getTab().getId()==2){
      cp5.get(Textarea.class,"recvData").clear();
      cp5.get(Textfield.class,"sendData").clear();
      send_flag=2;
    }
  }
}

void connect1(int a) {
  println("a radio Button event: "+a);
  radioFlag1=a;
  if(radioFlag1==1){
    String port_buffer = cp5.get(Textfield.class,"Local PORT").getText();
    int port = int(port_buffer);
    myServer = new Server(this,port); 
    println(Server.ip());
    cp5.get(Textfield.class,"Local IP").setText(Server.ip());
    println(port);
  }
  else 
    myServer.stop();
}
void connect2(int a) {
  println("a radio Button event: "+a);
  radioFlag2=a;
  if(radioFlag2==1){
    String port_buffer = cp5.get(Textfield.class,"Remote PORT").getText();
    String IP_buffer = cp5.get(Textfield.class,"Remote IP").getText();
    int port = int(port_buffer);
    if(IP_buffer.compareTo("192.168.1.xxx")==0){
      println("connect error!");
    }
    else{
      myClient = new Client(this,IP_buffer,port); 
      println("connect success!");
    }
      
  }
  else 
    myClient.stop();
}
void clearRecv(){
  cp5.get(Textarea.class,"recvData").clear();
}
void clearSend(){
  cp5.get(Textfield.class,"sendData").clear();
}
void send_Textfield_SendData(){
  if(send_flag==1){
    myServer.write(cp5.get(Textfield.class,"sendData").getText());
    cp5.get(Textfield.class,"sendData").clear();
  }
  else if(send_flag==2){
    myClient.write(cp5.get(Textfield.class,"sendData").getText());
    cp5.get(Textfield.class,"sendData").clear();
  }
}

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import controlP5.*;

import processing.net.*;

ControlP5 cp5;

//Println console;

Server myServer;

Client myClient;

int dataIn=0;

int radioFlag1=0;

int radioFlag2=0;

int send_flag=1;

void setup() {

size(600,400);

smooth();

noStroke();

cp5 = new ControlP5(this);

cp5.addTab("default")

.activateEvent(true)

.setHeight(30)

.setWidth(100)

.setLabel("TCP Server")

.setId(1)

;

cp5.getTab("TCP Client")

.activateEvent(true)

.setHeight(30)

.setWidth(100)

.setId(2)

;

cp5.addTextfield("Local IP")

.setPosition(20,40)

.setSize(160,40)

.setFont(createFont("微软雅黑 Light",20))

.setColor(color(255,255,0))

.setColorLabel(color(0))

.setColorBackground(color(100,255))

.moveTo("default")

;

cp5.addTextfield("Local PORT")

.setPosition(20,120)

.setSize(160,40)

.setFont(createFont("微软雅黑 Light",20))

.setColor(color(255,255,0))

.setColorLabel(color(0))

.setColorBackground(color(100,255))

.setText("8888")

.moveTo("default")

;

cp5.addRadioButton("connect1")

.setPosition(20,200)

.setSize(100,25)

.addItem("Listening", 1)

.setColorLabel(color(0))

.moveTo("default")

;

cp5.addTextfield("Remote IP")

.setPosition(20,40)

.setSize(160,40)

.setFont(createFont("微软雅黑 Light",20))

.setColor(color(255,255,0))

.setColorLabel(color(0))

.setColorBackground(color(100,255))

.setText("192.168.1.xxx")

.moveTo("TCP Client")

;

cp5.addTextfield("Remote PORT")

.setPosition(20,120)

.setSize(160,40)

.setFont(createFont("微软雅黑 Light",20))

.setColor(color(255,255,0))

.setColorLabel(color(0))

.setColorBackground(color(100,255))

.setText("80")

.moveTo("TCP Client")

;

cp5.addRadioButton("connect2")

.setPosition(20,200)

.setSize(100,25)

.addItem("connect Server",1)

.setColorLabel(color(0))

.moveTo("TCP Client")

;

cp5.addTextarea("recvData")

.setPosition(200,40)

.setSize(350,150)

.setFont(createFont("微软雅黑 Light",20))

.setColor(color(255,255,0))

.setColorBackground(color(100,255))

.scroll(15)

.setColorForeground(color(0,100))

.moveTo("global")

;

cp5.addTextfield("sendData")

.setPosition(200,230)

.setSize(350,80)

.setFont(createFont("微软雅黑 Light",20))

.setColor(color(255,255,0))

.setLabel("")

.setFocus(true)

.setColorBackground(color(100,255))

.setColorForeground(color(0,100))

.moveTo("global")

;

cp5.addButton("clearRecv")

.setValue(0)

.setPosition(200,200)

.setSize(100,20)

.setColorLabel(color(255,100))

.moveTo("global")

;

cp5.addButton("clearSend")

.setValue(0)

.setPosition(200,320)

.setSize(100,20)

.setColorLabel(color(255,100))

.moveTo("global")

;

cp5.addButton("Send")

.setValue(0)

.setPosition(450,320)

.setSize(100,20)

.plugTo(this,"send_Textfield_SendData")

.setColorLabel(color(255,100))

.moveTo("global")

;

cp5.get(Textfield.class,"Local IP").setText(Server.ip());

}

void draw(){

background(220);

if(radioFlag1==1){

Client thisClient = myServer.available();

if (thisClient !=null) {

String whatClientSaid = thisClient.readString();

if (whatClientSaid != null) {

cp5.get(Textarea.class,"recvData").append(thisClient.ip()+": ");

cp5.get(Textarea.class,"recvData").append(whatClientSaid+"\n");

}

// myServer.active()

if(radioFlag2==1){

if (myClient.available() > 0) {

String whatClientSaid = myClient.readString();

if (whatClientSaid != null) {

cp5.get(Textarea.class,"recvData").append(cp5.get(Textfield.class,"Remote IP").getText()+": ");

cp5.get(Textarea.class,"recvData").append(whatClientSaid+"\n");

}

void controlEvent(ControlEvent theControlEvent) {

if (theControlEvent.isTab()) {

if(theControlEvent.getTab().getId()==1){

cp5.get(Textarea.class,"recvData").clear();

cp5.get(Textfield.class,"sendData").clear();

send_flag=1;

}

else if(theControlEvent.getTab().getId()==2){

cp5.get(Textarea.class,"recvData").clear();

cp5.get(Textfield.class,"sendData").clear();

send_flag=2;

}

void connect1(int a) {

println("a radio Button event: "+a);

radioFlag1=a;

if(radioFlag1==1){

String port_buffer = cp5.get(Textfield.class,"Local PORT").getText();

int port = int(port_buffer);

myServer = new Server(this,port);

println(Server.ip());

cp5.get(Textfield.class,"Local IP").setText(Server.ip());

println(port);

}

else

myServer.stop();

}

void connect2(int a) {

println("a radio Button event: "+a);

radioFlag2=a;

if(radioFlag2==1){

String port_buffer = cp5.get(Textfield.class,"Remote PORT").getText();

String IP_buffer = cp5.get(Textfield.class,"Remote IP").getText();

int port = int(port_buffer);

if(IP_buffer.compareTo("192.168.1.xxx")==0){

println("connect error!");

}

else{

myClient = new Client(this,IP_buffer,port);

println("connect success!");

}

else

myClient.stop();

}

void clearRecv(){

cp5.get(Textarea.class,"recvData").clear();

}

void clearSend(){

cp5.get(Textfield.class,"sendData").clear();

}

void send_Textfield_SendData(){

if(send_flag==1){

myServer.write(cp5.get(Textfield.class,"sendData").getText());

cp5.get(Textfield.class,"sendData").clear();

}

else if(send_flag==2){

myClient.write(cp5.get(Textfield.class,"sendData").getText());

cp5.get(Textfield.class,"sendData").clear();

}

Avviamo il codice e si aprirà un pop-up. Andiamo su TCP-CLIENT e inseriamo l’indirizzo IP del nostro router che abbiamo trovato prima su Arduino IDE.

Clicchiamo su Connect Server e ora possiamo scambiare messaggi tra ESP32 e PC (usando il monitor seriale di Arduino IDE).

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Simone Candido

Simone Candido è un ragazzo appassionato del mondo tech nella sua totalità. Simone ama immedesimarsi in nuove esperienze, la sua filosofia si basa sulla irrefrenabile voglia di ampliare a 360° le sue conoscenze abbracciando tutti i campi del sapere, in quanto ritiene che il sapere umano sia il connubio perfetto tra cultura umanistica e scientifica.