mqtt wrapper first version working

src/mqtt.h

@@ -0,0 +1,58 @@
+#pragma once
+
+#define DEBUGLOG_DEFAULT_LOG_LEVEL_DEBUG
+
+#include <DebugLog.h>
+#include <Arduino.h>
+#include <ArduinoJson.h>
+#include <Network.h>
+#include <PubSubClient.h>
+
+#include <config.h>
+
+#include <mutex>
+
+typedef std::string topic_t;
+typedef std::function<void(const ArduinoJson::JsonDocument &)> action_t; // the actions receive a JsonObject containing the received message
+typedef std::map<topic_t, action_t> action_map_t;
+
+class MQTTwrapper
+{
+
+private:
+    static MQTTwrapper *getInstance(MQTTwrapper *inst = nullptr)
+    {
+        static std::unique_ptr<MQTTwrapper> m_instance;
+        if (inst)
+            m_instance.reset(inst);
+        if (m_instance)
+            return m_instance.get();
+        return nullptr;
+    }
+
+public:
+    MQTTwrapper();
+    ~MQTTwrapper();
+
+    const bool connect();
+    const bool disconnect();
+
+    const bool subscribe(topic_t topic, action_t action);
+    const bool unsubscribe(topic_t topic);
+
+    const bool publish(topic_t topic, const ArduinoJson::JsonDocument obj);
+
+private:
+    static void callback(char *topic, uint8_t *payload, unsigned int length); // C-style callback only to invoke onMessage
+    void onMessage(const std::string topic, const std::string message);
+
+    // infinite loop to call the client loop method in a taskHandle
+    static void clientLoop(void *params);
+
+private:
+    const Config &m_config;
+    action_map_t m_actionMap;
+    NetworkClient m_tcp;
+    PubSubClient m_client;
+    TaskHandle_t m_loopHandle;
+};