/********************************************************************************
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* Copyright: (C) 2020 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: tlv_pack.h
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* Description: This head file is for TLV packet
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*
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* Version: 1.0.0(2020年04月15日)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "2020年04月15日 23时14分21秒"
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*
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********************************************************************************/
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#ifndef _TLV_PACK_H_
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#define _TLV_PACK_H_
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#include <stdint.h>
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#include <time.h>
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/* TLV Packet format:
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*
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*+------------+---------+------------+-----------+-----------+
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*| Header(1B) | Tag(1B) | Length(1B) | Value(1B) | CRC16(2B) |
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*+------------+---------+------------+-----------+-----------+
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*/
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#define PACK_HEADER 0xFD
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/* TLV packet fixed segement size, 1B Head, 1B Tag, 1B length, 2B CRC16, total 5B. */
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#define TLV_FIXED_SIZE 5
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/* TLV packet Minimum size is fixed bytes + 1 byte data */
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#define TLV_MIN_SIZE (TLV_FIXED_SIZE+1)
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#define TLV_MAX_SIZE 32 /* all TLV packet length are no more than 32 bytes */
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/* Tag definition */
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enum
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{
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TAG_ACK=1,
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TAG_SN,
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TAG_TEMP,
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TAG_TIME,
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};
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#define TLV_BUFSIZE 256
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#define TLV_FLAG_TX 1<<0 /* This TLV message need to be sent by socket */
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#define TLV_FLAG_DB 1<<1 /* This TLV message need to be saved in database */
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typedef struct tlv_buf_s
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{
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uint8_t flag; /* TLV message flags */
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char buf[TLV_BUFSIZE];
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int len; /* data length */
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int size; /* buffer size */
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} tlv_buf_t;
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typedef struct tlv_pack_s
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{
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unsigned char header;
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unsigned char tag;
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char len;
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char data[0];
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/* followed: $len bytes payload data */
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/* followed: 2 bytes CRC checksum */
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} tlv_pack_t;
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/* Packet TLV message for server reply ACK message: ACK(ack=1)/NAK(ack=0) */
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#define ACK 1
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#define NAK 0
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int packtlv_ack (char *buf, int size, int ack);
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/* Packet TLV message for SN */
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int packtlv_sn (char *buf, int size, char *sn);
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/* Packet TLV message for temperature */
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int packtlv_temp(char *buf, int size, uint16_t temp);
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/* Packet TLV message for date time */
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int packtlv_time(char *buf, int size, struct tm *tm);
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/* Packet 3 TLV message together: with SN, temperature, date&time */
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int packtlv_msg(tlv_buf_t *tlv, char *sn, uint16_t temp, struct tm *tm);
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/* print buf data in hex and string mode */
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void dump_buf(char *data, int len);
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#endif /* ----- #ifndef _TLV_PACK_H_ ----- */
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