/********************************************************************************
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* Copyright: (C) 2022 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: packet.h
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* Description: This head file is packet API functions.
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*
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* Version: 1.0.0(18/04/22)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "18/04/22 16:24:40"
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*
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********************************************************************************/
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#ifndef _PACKET_H_
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#define _PACKET_H_
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#include <stdint.h>
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#include <time.h>
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#define DEVID_LEN 16
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#define TIME_LEN 32
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typedef struct pack_info_s
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{
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char devid[DEVID_LEN]; /* device ID */
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struct tm sample_time; /* sample time */
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float temper; /* sample temperature */
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} pack_info_t;
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/* packet function pointer type */
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typedef int (* pack_proc_t)(pack_info_t *pack_info, char *pack_buf, int size);
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/* description: get device ID
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* input args:
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* $devid : device ID string
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* $size : device ID output buffer size
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* $sn : serial number
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* return value: <0: failure 0:ok
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*/
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extern int get_devid(char *devid, int size, int sn);
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/* description: get current system in struct tm
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* input args:
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* $sample_time: sample time in struct tm
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* return value: <0: failure 0:ok
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*/
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extern int get_time(struct tm *sample_time);
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/* description: package a string packet in format "devid|time|temper"
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* input args:
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* $pack_info: packet data contains devid, time and temperature
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* $pack_buf : packet output buffer
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* $size : packet output buffer size
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* return value: <0: failure >0: packet bytes
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*/
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extern int packet_segmented_pack(pack_info_t *pack_info, char *pack_buf, int size);
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/* description: package a json string packet: {"devid":"xxx", "time":"xxx", "temperature":"xxx"}
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* input args:
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* $pack_info: packet data contains devid, time and temperature
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* $pack_buf : packet output buffer
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* $size : packet output buffer size
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* return value: <0: failure >0: packet bytes
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*/
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extern int packet_json_pack(pack_info_t *pack_info, char *pack_buf, int size);
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#endif /* ----- #ifndef _PACKET_H_ ----- */
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