callback API added

features/cellular/framework/API/CellularNetwork.h

@@ -381,6 +381,30 @@ public:
      *  @return NSAPI_ERROR_OK on success, negative error code on failure
      */
     virtual nsapi_error_t get_operator_params(int &format, operator_t &operator_params) = 0;
+
+    /** Register callback for status reporting
+     *
+     *  The specified status callback function will be called on status changes
+     *  on the network. The parameters on the callback are the event type and
+     *  event-type dependent reason parameter.
+     *
+     *  @param status_cb The callback for status changes
+     */
+    virtual void attach(mbed::Callback<void(nsapi_event_t, intptr_t)> status_cb) = 0;
+
+    /** Get the connection status
+     *
+     *  @return         The connection status according to ConnectionStatusType
+     */
+    virtual nsapi_connection_status_t get_connection_status() const = 0;
+
+    /** Set blocking status of connect() which by default should be blocking
+     *
+     *  @param blocking true if connect is blocking
+     *  @return         0 on success, negative error code on failure
+     */
+    virtual nsapi_error_t set_blocking(bool blocking) = 0;
+
 };
 
 } // namespace mbed