client.connected() return true when internet lost connection

[ruem2802]

Hi there! I am am currently working on a ESP8266 with example:

#include <ESP8266WiFi.h> #include <PubSubClient.h> #define BUTTON D1 // WiFi const char *ssid = "mousse"; // Enter your WiFi name const char *password = "qweqweqwe"; // Enter WiFi password

// MQTT Broker const char *mqtt_broker = "broker.emqx.io"; const char *topic = "esp8266/test"; const char *mqtt_username = "emqx"; const char *mqtt_password = "public"; const int mqtt_port = 1883; bool status_internet = true ;

WiFiClient espClient; PubSubClient client(espClient);

void setup() { // Set software serial baud to 115200; Serial.begin(115200); pinMode(BUTTON, INPUT); // Button 1 as input // connecting to a WiFi network WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.println("Connecting to WiFi.."); } Serial.println("Connected to the WiFi network"); //connecting to a mqtt broker client.setServer(mqtt_broker, mqtt_port); client.setCallback(callback); while (!client.connected()) { status_internet = fail; String client_id = "esp8266-client-"; client_id += String(WiFi.macAddress()); Serial.printf("The client %s connects to the public mqtt broker\n", client_id.c_str()); if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) { status_internet = true; Serial.println("Public emqx mqtt broker connected"); } else {
Serial.print("failed with state "); Serial.print(client.state()); delay(2000); } } // publish and subscribe client.publish(topic, "hello emqx"); client.subscribe(topic); }

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

void check_input() { if(digitalRead(BUTTON_1) client.publish("state button", 1); else client.publish("state button", 0); } void loop() { client.loop(); check_input(); }

When internet lost connection: client.connected() return true so I continue to publish -> Error