update

README.md

@@ -327,6 +327,86 @@ suivant :
 
 Voici le code utilisé pour programmer l’ESP32 en utilisant l’ide d’Arduino : [main.ino](ESP-codes/C/main.ino)
 
+<pre><code>
+```C
+#include <WiFi.h>
+#include <PubSubClient.h>
+#include <LiquidCrystal.h>
+
+ 
+const char* ssid = "PT4ObjConnect";
+const char* password =  "Admin2022";
+const char* mqttServer = "192.168.1.64";
+const int mqttPort = 1883;
+const char* mqttUser = "patate";
+const char* mqttPassword = "patate";
+
+LiquidCrystal lcd(19, 23, 18, 17, 16, 15);
+ 
+WiFiClient espClient;
+PubSubClient client(espClient);
+ 
+void callback(char* topic, byte* payload, unsigned int length) {
+ 
+  Serial.print("Message arrived in topic: ");
+  Serial.println(topic);
+ 
+  Serial.print("Message:");
+  lcd.clear();
+  for (int i = 0; i < length; i++) {
+    Serial.print((char)payload[i]);
+    lcd.print((char)payload[i]);
+  }
+ 
+  Serial.println();
+  Serial.println("-----------------------");
+
+  
+ 
+}
+ 
+void setup() {
+ 
+  Serial.begin(115200);
+  lcd.begin(16, 2);
+  WiFi.begin(ssid, password);
+ 
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.println("Connecting to WiFi..");
+  }
+  Serial.println("Connected to the WiFi network");
+ 
+  client.setServer(mqttServer, mqttPort);
+  client.setCallback(callback);
+ 
+  while (!client.connected()) {
+    Serial.println("Connecting to MQTT...");
+ 
+    if (client.connect("ESP32Client", mqttUser, mqttPassword )) {
+ 
+      Serial.println("connected");  
+ 
+    } else {
+ 
+      Serial.print("failed with state ");
+      Serial.print(client.state());
+      delay(2000);
+ 
+    }
+  }
+ 
+  client.subscribe("esp32/lcd");
+ 
+}
+ 
+void loop() {
+  client.loop();
+}
+
+```
+</code></pre>
+
 Les librairies PubSubClient et LiquidCrystal ont été utilisées pour la communication MQTT et l'utilisation du LCD.