chore: added docs for dataUpload class (#137)

src/cellular/dataUpload.hpp

@@ -36,17 +36,51 @@
  */
 #define DU_UPLOAD_MAX_REATTEMPTS    5
 
-
-class DataUpload : public Task{
-    public:
+/**
+ * @class DataUpload
+ * @brief Handles the data upload task.
+ *
+ * This class implements the task methods and internal states
+ * required for data uploading.
+ */
+class DataUpload : public Task
+{
+public:
+    /**
+     * @brief Initializes the data upload task.
+     */
     void init(void);
+
+    /**
+     * @brief Executes the data upload task logic.
+     *
+     * @return The next state after executing the task.
+     */
     STATES_e run(void);
+
+    /**
+     * @brief Cleans up resources and exits the task.
+     */
     void exit(void);
 
-    private:
+private:
+    //! Flag to indicate successful initialization.
     int initSuccess;
+    //! Tracks the last connection attempt time.
     system_tick_t lastConnectTime;
+
+    /**
+     * @brief State to transition to upon task exit.
+     *
+     * @return The exit state.
+     */
     STATES_e exitState(void);
+
+    /**
+     * @brief Checks if data can be uploaded.
+     *
+     * @return The current state indicating upload readiness.
+     */
     STATES_e can_upload(void);
 };
 #endif