Secured-ESP8266-Client can't seem to receive any messages while connection is open

Hi, recently I'm making an IoT project which needs a secured websocket connection (SSL). Then I found and tried this library which almost made my project works perfectly than any library I've tried. The problem is, my ESP8266 can only receive a message only when it's successfully connected to my websocket server. After that, it won't receive any messages whenever an event occurs.

I'm using the ESP8266 WeMos D1 R2 board.
Laravel Websockets as websocket server
Library version is 0.5.3

Just a slight addition (wifi and server) to the Secured Client example, but here's my whole code.

#include <ArduinoWebsockets.h>
#include <ESP8266WiFi.h>

const char* ssid = "hotspot1024"; //Enter SSID
const char* password = "12345678"; //Enter Password

const char* websockets_connection_string = "wss://ecato.my.id:6002/app/ABCDEFG?protocol=7&client=js&version=4.3.1&flash=false"; //Enter server address

// This latest SHA1 fingerprint was updated 15.04.2021
const char echo_org_ssl_fingerprint[] PROGMEM   = "B4 A0 D6 76 1B 68 01 54 43 A7 33 45 AB D5 73 CE 06 09 40 83";

using namespace websockets;

void onMessageCallback(WebsocketsMessage message) {
    Serial.print("Got Message: ");
    Serial.println(message.data());
}

void onEventsCallback(WebsocketsEvent event, String data) {
    if(event == WebsocketsEvent::ConnectionOpened) {
        Serial.println("Connnection Opened");
    } else if(event == WebsocketsEvent::ConnectionClosed) {
        Serial.println("Connnection Closed");
    } else if(event == WebsocketsEvent::GotPing) {
        Serial.println("Got a Ping!");
    } else if(event == WebsocketsEvent::GotPong) {
        Serial.println("Got a Pong!");
    }
}

WebsocketsClient client;
void setup() {
    Serial.begin(115200);
    // Connect to wifi
    WiFi.begin(ssid, password);

    for(int i = 0; i < 10 && WiFi.status() != WL_CONNECTED; i++) {
        Serial.print(".");
        delay(1000);
    }

    // run callback when messages are received
    client.onMessage(onMessageCallback);

    // run callback when events are occuring
    client.onEvent(onEventsCallback);

    // Before connecting, set the ssl fingerprint of the server
    client.setFingerprint(echo_org_ssl_fingerprint);

    // Connect to server
    client.connect(websockets_connection_string);

    // Send a message
    client.send("Hello Server");

    // Send a ping
    client.ping();
}

void loop() {
    client.poll();
}

And here's my serial log. ...... Connnection Opened Got Message: {"event":"pusher:connection_established","data":"{\"socket_id\":\"539968520.540064775\",\"activity_timeout\":30}"} Got a Pong!

Here's my websocket server dashboard The red highlighted square is when the ESP8266 connection successfully established. The blue hightlighted square is when I sent an event.

Did I do something wrong with my code or it's just the server-side that's causing the problem?

gilmaimon / ArduinoWebsockets

Secured-ESP8266-Client can't seem to receive any messages while connection is open #143