added gpio read function

mission/devices/GomspaceDeviceHandler.h

@@ -36,6 +36,12 @@ public:
 	        uint16_t hkTableReplySize, LocalPoolDataSetBase* hkTableDataset);
 	virtual ~GomspaceDeviceHandler();
 
+	/**
+	 * @brief   This function can be used to set a gomspace device to normal mode immediately after
+	 *          object creation.
+	 */
+	void setModeNormal();
+
 protected:
 
 	static const uint8_t MAX_PACKET_LEN = 36;