充电桩设计之4G模块 基于4G网络通过MQTT 获取NTP时间

/* ntpclient.c */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "stm32f10x.h"
#if 0
#define VERSION_3           3
#define VERSION_4           4

#define MODE_CLIENT         3
#define MODE_SERVER         4


#define NTP_LI              0
#define NTP_VN              VERSION_3   
#define NTP_MODE            MODE_CLIENT
#define NTP_STRATUM         0
#define NTP_POLL            4
#define NTP_PRECISION       -6

#define NTP_HLEN            48

#define NTP_PORT            123
#define NTP_SERVER          "182.92.12.11"

#define TIMEOUT             10

#define BUFSIZE             1500

#define JAN_1970            0x83aa7e80

#define NTP_CONV_FRAC32(x)  (uint64_t) ((x) * ((uint64_t)1<<32))    
#define NTP_REVE_FRAC32(x)  ((double) ((double) (x) / ((uint64_t)1<<32)))   

#define NTP_CONV_FRAC16(x)  (uint32_t) ((x) * ((uint32_t)1<<16))    
#define NTP_REVE_FRAC16(x)  ((double)((

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原文链接：blog.csdn.net/xushx_bigbear/article/details/122871489