add some code

managed_components/78__esp-ml307/include/mqtt.h

@@ -0,0 +1,32 @@
+#ifndef MQTT_INTERFACE_H
+#define MQTT_INTERFACE_H
+
+#include <string>
+#include <functional>
+
+class Mqtt {
+public:
+    virtual ~Mqtt() {}
+
+    void SetKeepAlive(int keep_alive_seconds) { keep_alive_seconds_ = keep_alive_seconds; }
+    virtual bool Connect(const std::string broker_address, int broker_port, const std::string client_id, const std::string username, const std::string password) = 0;
+    virtual void Disconnect() = 0;
+    virtual bool Publish(const std::string topic, const std::string payload, int qos = 0) = 0;
+    virtual bool Subscribe(const std::string topic, int qos = 0) = 0;
+    virtual bool Unsubscribe(const std::string topic) = 0;
+    virtual bool IsConnected() = 0;
+
+    virtual void OnConnected(std::function<void()> callback) { on_connected_callback_ = std::move(callback); }
+    virtual void OnDisconnected(std::function<void()> callback) { on_disconnected_callback_ = std::move(callback); }
+    virtual void OnMessage(std::function<void(const std::string& topic, const std::string& payload)> callback) { on_message_callback_ = std::move(callback); }
+    virtual void OnError(std::function<void(const std::string& error)> callback) { on_error_callback_ = std::move(callback); }
+
+protected:
+    int keep_alive_seconds_ = 120;
+    std::function<void(const std::string& topic, const std::string& payload)> on_message_callback_;
+    std::function<void()> on_connected_callback_;
+    std::function<void()> on_disconnected_callback_;
+    std::function<void(const std::string& error)> on_error_callback_;
+};
+
+#endif // MQTT_INTERFACE_H