Added Basic MQTT Support and JSON Deserialization

ESP32_Utils.hpp

@@ -0,0 +1,40 @@
+void ConnectWiFi_STA(bool useStaticIP = false) 
+{
+  Serial.println("");
+  WiFi.mode(WIFI_STA); 
+  if(useStaticIP) {
+    WiFi.config(ip, gateway, subnet);
+    WiFi.setHostname(hostname);
+  }
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED) { 
+    delay(100);  
+    Serial.print('.'); 
+  }
+ 
+  Serial.println("");
+  Serial.print("Iniciado STA:\t");
+  Serial.println(ssid);
+  Serial.print("IP address:\t");
+  Serial.println(WiFi.localIP());
+}
+
+void ConnectWiFi_AP(bool useStaticIP = false)
+{ 
+  Serial.println("");
+  WiFi.mode(WIFI_AP);
+  while(!WiFi.softAP(ssid, password))
+  {
+    Serial.println(".");
+    delay(100);
+  }
+  
+  if(useStaticIP) WiFi.softAPConfig(ip, gateway, subnet);
+
+  Serial.println("");
+  Serial.print("Iniciado AP:\t");
+  Serial.println(ssid);
+  Serial.print("IP address:\t");
+  Serial.println(WiFi.softAPIP());
+}

ESP32_Utils_MQTT_Async.hpp

@@ -0,0 +1,89 @@
+#pragma once
+
+TimerHandle_t mqttReconnectTimer;
+TimerHandle_t wifiReconnectTimer;
+
+void ConnectToMqtt()
+{
+	Serial.println("Connecting to MQTT...");
+	mqttClient.connect();
+}
+
+void WiFiEvent(WiFiEvent_t event)
+{
+	Serial.printf("[WiFi-event] event: %d\n", event);
+	switch(event)
+	{
+	case ARDUINO_EVENT_WIFI_STA_GOT_IP:
+		Serial.println("WiFi connected");
+		Serial.println("IP address: ");
+		Serial.println(WiFi.localIP());
+		ConnectToMqtt();
+		break;
+	case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:
+		Serial.println("WiFi lost connection");
+		xTimerStop(mqttReconnectTimer, 0); // ensure we don't reconnect to MQTT while reconnecting to Wi-Fi
+		xTimerStart(wifiReconnectTimer, 0);
+		break;
+	}
+}
+
+void OnMqttConnect(bool sessionPresent)
+{
+	Serial.println("Connected to MQTT.");
+	Serial.print("Session present: ");
+	Serial.println(sessionPresent);
+	SuscribeMqtt();
+}
+
+void OnMqttDisconnect(AsyncMqttClientDisconnectReason reason)
+{
+	Serial.println("Disconnected from MQTT.");
+
+	if(WiFi.isConnected())
+	{
+		xTimerStart(mqttReconnectTimer, 0);
+	}
+}
+
+void OnMqttSubscribe(uint16_t packetId, uint8_t qos)
+{
+	Serial.println("Subscribe acknowledged.");
+	Serial.print("  packetId: ");
+	Serial.println(packetId);
+	Serial.print("  qos: ");
+	Serial.println(qos);
+}
+
+void OnMqttUnsubscribe(uint16_t packetId)
+{
+	Serial.println("Unsubscribe acknowledged.");
+	Serial.print("  packetId: ");
+	Serial.println(packetId);
+}
+
+
+void OnMqttPublish(uint16_t packetId)
+{
+	Serial.println("Publish acknowledged.");
+	Serial.print("  packetId: ");
+	Serial.println(packetId);
+}
+
+void InitMqtt()
+{
+	mqttReconnectTimer = xTimerCreate("mqttTimer", pdMS_TO_TICKS(2000), pdFALSE, (void*)0, reinterpret_cast<TimerCallbackFunction_t>(ConnectToMqtt));
+	wifiReconnectTimer = xTimerCreate("wifiTimer", pdMS_TO_TICKS(5000), pdFALSE, (void*)0, reinterpret_cast<TimerCallbackFunction_t>(ConnectWiFi_STA));
+
+	mqttClient.onConnect(OnMqttConnect);
+	mqttClient.onDisconnect(OnMqttDisconnect);
+
+	mqttClient.onSubscribe(OnMqttSubscribe);
+	mqttClient.onUnsubscribe(OnMqttUnsubscribe);
+
+	mqttClient.onMessage(OnMqttReceived);
+	mqttClient.onPublish(OnMqttPublish);
+
+	mqttClient.setServer(MQTT_HOST, MQTT_PORT);
+  mqttClient.setCredentials(MQTT_USER, MQTT_PASS);
+}

JSON_functions.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+void reconstr (String payload) {
+  JsonDocument doc;
+
+  DeserializationError error = deserializeJson(doc, payload);
+
+  if (error) {
+    Serial.print("deserializeJson() failed: ");
+    Serial.println(error.c_str());
+    return;
+  }
+
+  // EXAMPLE PAYLOAD. CHANGE THIS TO THE APPROPRIATE ONE.
+  int a = doc["a"];
+  bool b = doc["b"];
+  float c = doc["c"];
+  Serial.println("The payload received contains: ");
+  Serial.print("a: ");
+  Serial.print(a);
+  Serial.print("  b: ");
+  Serial.print(b);
+  Serial.print("  c: ");
+  Serial.println(c);
+  
+}

MQTT.hpp

@@ -0,0 +1,42 @@
+#pragma once
+
+const IPAddress MQTT_HOST(10, 98, 20, 10);
+const int MQTT_PORT = 1883;
+
+AsyncMqttClient mqttClient;
+
+String GetPayloadContent(char* data, size_t len)
+{
+	String content = "";
+	for(size_t i = 0; i < len; i++)
+	{
+		content.concat(data[i]);
+	}
+	return content;
+}
+
+void SuscribeMqtt()
+{
+	uint16_t packetIdSub = mqttClient.subscribe("user123456/channel", 0);
+	Serial.print("Subscribing at QoS 2, packetId: ");
+	Serial.println(packetIdSub);
+}
+
+String payload;
+void PublishMqtt(unsigned long data)
+{
+	String payload = String(data);
+	mqttClient.publish("hello/world", 0, true, (char*)payload.c_str());
+}
+
+void OnMqttReceived(char* topic, char* payload, AsyncMqttClientMessageProperties properties, size_t len, size_t index, size_t total)
+{
+	//Serial.print("Received on ");
+	//Serial.print(topic);
+	//Serial.print(": ");
+
+	String content = GetPayloadContent(payload, len);
+  reconstr(content);
+	//Serial.print(content);
+	//Serial.println();
+}

config.h

@@ -0,0 +1,10 @@
+const char* ssid     = "SmartNet";
+const char* password = "smartpass";
+const char* hostname = "ESP32_mqtt_test";
+
+IPAddress ip(10, 98, 30, 150);
+IPAddress gateway(10, 98, 30, 1);
+IPAddress subnet(255, 255, 255, 0);
+
+#define MQTT_USER "esp32_vesper"
+#define MQTT_PASS "vesper"

vesper.ino

@@ -1,9 +1,31 @@
-void setup() {
-  // put your setup code here, to run once:
+#
 
+#include <WiFi.h>
+#include <AsyncMqttClient.h>
+#include <ArduinoJson.h>
+
+#include "config.h"  // Sustituir con datos de vuestra red
+#include "JSON_functions.hpp"
+#include "MQTT.hpp"
+#include "ESP32_Utils.hpp"
+#include "ESP32_Utils_MQTT_Async.hpp"
+
+
+void setup()
+{
+	Serial.begin(115200);
+
+	delay(500);
+
+	WiFi.onEvent(WiFiEvent);
+	InitMqtt();
+
+	ConnectWiFi_STA();
 }
 
-void loop() {
-  // put your main code here, to run repeatedly:
-
-}
+void loop()
+{
+	// EXAMPLE PUBLISH. CHANGE THIS, IF NEEDED. 
+  //delay(1000);
+	//PublishMqtt(millis());
+}