Problem connecting to websocket server deployed to Heroku from ESP32

Question

This is the ESP32 code I have. I have generated a .pem file using

openssl s_client -showcerts -connect hidden-thicket-03510.herokuapp.com:443

But still I have a problem connecting to the server using WiFisecureClient.

Can you please tell me what I have done wrong? My guess is that I have done something wrong when attaching the certificate.

Thanks for the help

#include <WiFiClientSecure.h>
#include <WebSocketClient.h>
#include <ArduinoJson.h> 
const char* ssid     = "##";
const char* password = "###";
 
char path[] = "/";
char host[] = "https://hidden-thicket-03510.herokuapp.com";
 
WebSocketClient webSocketClient;
WiFiClientSecure client;

const char* test_root_ca= 
  "-----BEGIN CERTIFICATE-----
" 
  "MIIDxTCCAq2gAwIBAgIQAqxcJmoLQJuPC3nyrkYldzANBgkqhkiG9w0BAQUFADBs
" 
  "MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
" 
  "d3cuZGlnaWNlcnQuY29tMSswKQYDVQQDEyJEaWdpQ2VydCBIaWdoIEFzc3VyYW5j
" 
  "ZSBFViBSb290IENBMB4XDTA2MTExMDAwMDAwMFoXDTMxMTExMDAwMDAwMFowbDEL
" 
  "MAkGA1UEBhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3
" 
  "LmRpZ2ljZXJ0LmNvbTErMCkGA1UEAxMiRGlnaUNlcnQgSGlnaCBBc3N1cmFuY2Ug
" 
  "RVYgUm9vdCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMbM5XPm
" 
  "+9S75S0tMqbf5YE/yc0lSbZxKsPVlDRnogocsF9ppkCxxLeyj9CYpKlBWTrT3JTW
" 
  "PNt0OKRKzE0lgvdKpVMSOO7zSW1xkX5jtqumX8OkhPhPYlG++MXs2ziS4wblCJEM
" 
  "xChBVfvLWokVfnHoNb9Ncgk9vjo4UFt3MRuNs8ckRZqnrG0AFFoEt7oT61EKmEFB
" 
  "Ik5lYYeBQVCmeVyJ3hlKV9Uu5l0cUyx+mM0aBhakaHPQNAQTXKFx01p8VdteZOE3
" 
  "hzBWBOURtCmAEvF5OYiiAhF8J2a3iLd48soKqDirCmTCv2ZdlYTBoSUeh10aUAsg
" 
  "EsxBu24LUTi4S8sCAwEAAaNjMGEwDgYDVR0PAQH/BAQDAgGGMA8GA1UdEwEB/wQF
" 
  "MAMBAf8wHQYDVR0OBBYEFLE+w2kD+L9HAdSYJhoIAu9jZCvDMB8GA1UdIwQYMBaA
" 
  "FLE+w2kD+L9HAdSYJhoIAu9jZCvDMA0GCSqGSIb3DQEBBQUAA4IBAQAcGgaX3Nec
" 
  "nzyIZgYIVyHbIUf4KmeqvxgydkAQV8GK83rZEWWONfqe/EW1ntlMMUu4kehDLI6z
" 
  "eM7b41N5cdblIZQB2lWHmiRk9opmzN6cN82oNLFpmyPInngiK3BD41VHMWEZ71jF
" 
  "hS9OMPagMRYjyOfiZRYzy78aG6A9+MpeizGLYAiJLQwGXFK3xPkKmNEVX58Svnw2
" 
  "Yzi9RKR/5CYrCsSXaQ3pjOLAEFe4yHYSkVXySGnYvCoCWw9E1CAx2/S6cCZdkGCe
" 
  "vEsXCS+0yx5DaMkHJ8HSXPfqIbloEpw8nL+e/IBcm2PN7EeqJSdnoDfzAIJ9VNep
" 
  "+OkuE6N36B9K
" 
  "-----END CERTIFICATE-----
";

int timer=0;

void connnect() {
  if (client.connect(host,443)) {
    Serial.println("Connected");
  } else {
    Serial.println("Connection failed.");
  }
 
  webSocketClient.path = path;
  webSocketClient.host = host;
  if (webSocketClient.handshake(client)) {
    Serial.println("Handshake successful");
  } else {
    Serial.println("Handshake failed.");
  }
}

void setup() {
  Serial.begin(115200);
 
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
 
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
 
  delay(5000);
  client.setCACert(test_root_ca);
  
  connnect();

  if (client.connected()) {
    webSocketClient.sendData("Info to be echoed back");
  }
}
 
void loop() {
  String data;
  
  if (client.connected()) {
    webSocketClient.getData(data);
    Serial.println(data);
    int data_len = data.length() + 1; 
    char char_array[data_len];
    data.toCharArray(char_array, data_len);
    StaticJsonDocument<1200> doc;

    const char* a=doc["message"];
    
    if (data_len > 1) {
      Serial.print("Received data: ");
      Serial.println(a);
    }
  } else {
    Serial.println("Client disconnected.");
    connnect();
  }
 
  delay(3000);
}

If it would be of any help, this is the server code running on Heroku:

var WebSocketServer = require('websocket').server;
var http = require('http');

var server = http.createServer(function(request, response) {
    console.log((new Date()) + ' Received request for ' + request.url);
    response.writeHead(404);
    response.end();
});
let port =process.env.PORT || 5000;
server.listen(port, function() {
    console.log((new Date()) + ' Server is listening on port 5000');
});

wsServer = new WebSocketServer({
    httpServer: server
});
const clients={}
wsServer.on('request', request=> { 
    var connection = request.accept(null, request.origin);
    console.log((new Date()) + ' Connection accepted.');
    
    const clientId=guid();
    clients[clientId]={
        "connection":connection
    };

    // connection.sendUTF("JSON.stringify(payload)")
    connection.on('open',()=>{console.log("opened")})

    connection.on('message', message => {
        console.log(message);
        var a=JSON.stringify({'message':'sdaed'})
        connection.send(a)
        
    });

    connection.on('close', (reasonCode, description) =>{
        console.log((new Date()) + ' Peer ' + connection.remoteAddress + ' disconnected.');
    });

    const payload={
        "method":"connect",
        "clientId":clientId
    }
    
});

const guid=()=> {
    const s4=()=> Math.floor((1 + Math.random()) * 0x10000).toString(16).substring(1);     
    return `${s4() + s4()}-${s4()}-${s4()}-${s4()}-${s4() + s4() + s4()}`;
  }

The Serial output is,

Connected
Waiting...
Waiting...
Waiting...
Handshake failed.
Client disconnected.
Connected
Waiting...
Waiting...
Waiting...
Handshake failed.
Client disconnected.
Connected
Waiting...
Waiting...
Waiting...
Waiting...
Waiting...
Handshake failed.

question from:https://stackoverflow.com/questions/65942740/problem-connecting-to-websocket-server-deployed-to-heroku-from-esp32

Answer 1

Waitting for answers