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diff --git a/bertos/net/keytag.h b/bertos/net/keytag.h
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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2008 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \author Andrea Grandi <andrea@develer.com>
+ *
+ * \brief Tag protocol. (interface).
+ */
+
+#ifndef NET_KEYTAG_H
+#define NET_KEYTAG_H
+
+#include <kern/kfile.h>
+#include <drv/ser.h>
+
+/**
+ * Starting communication char (STX).
+ */
+#define TAG_STX 0x02
+
+/**
+ * Ending communication char (ETX).
+ */
+#define TAG_ETX 0x03
+
+/**
+ * Max buffer lenght
+ */
+#define TAG_MAX_LEN 14
+
+#define TAG_SER_PORT 0
+#define TAG_SER_BAUDRATE 9600
+
+/**
+ * Max number of chars to print in the communication serial
+ */
+#define TAG_MAX_PRINT_CHARS 12
+
+/**
+ * Structure of a Tag packet
+ */
+typedef struct TagPacket
+{
+	KFileSerial *tag_ser;		// Tag serial
+	KFileSerial *comm_ser;        // Communication serial
+	bool sync;                  	// Status flag: true if we find an STX
+	uint16_t len;            	// Packet lenght
+	uint8_t buf[TAG_MAX_LEN]; 	// Reception buffer
+} TagPacket;
+
+void keytag_init(struct TagPacket *pkt);
+void keytag_poll(struct TagPacket *pkt);
+
+#endif /* NET_TAG_H */