IS it possible to connect mqtt broker in node-red with esp8266?

[coldbook01]

I want to use different from mqtt's network to accomplish different domains access mqtt broker on node-red, but it need enter localhost as password.
The test is now unsuccessful, I want to know the feasibility of this function.
`#include <ESP8266WiFi.h>
#include <PubSubClient.h>

// WiFi 設定
const char* ssid = "";
const char* password = "";

// MQTT 伺服器資訊
const char* mqttServer = "https://easy-wasps-spend.loca.lt"; // 您的 LocalTunnel 公佈的 URL
const int mqttPort = ;

// MQTT 用戶名和密碼
const char* mqttUser = "";
const char* mqttPassword = "";

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
Serial.begin(115200);
setup_wifi();
client.setServer(mqttServer, mqttPort);
client.setCallback(callback);
}

void setup_wifi() {
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password); // 包含路由器登錄密碼
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
}

void reconnect() {
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
if (client.connect("ESP8266Client", mqttUser, mqttPassword)) {
Serial.println("connected");
client.subscribe(""); // 訂閱 room/light 節點
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}

void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
// 在這裡可以添加您的代碼，發送或處理 MQTT 消息
}
`
this is the code i trying with.