UDP NTP Client
NTP
*Network Time Protocol - wikipedia
*참조:https://blog.cloudflare.com/understanding-and-mitigating-ntp-based-ddos-attacks/
Do UdpNtpClient
Import Program NTPClinet_HelloWorld: “http://developer.mbed.org/users/embeddist/code/UdpNtpClient/
if same program is existed, Import Name of NTPClinet_HelloWorld will be changed(2).
Remove mbed-rtos and EthernetInterface
- Remove mbe-rtos
- Remove EethernetInterface
- Directory after removing mbed-rtos & EthernetInterface
- Remove mbe-rtos
Import WIZnetInterface”https://developer.mbed.org/teams/WIZnet/code/WIZnetInterface/"(1)
Dirctory for UdpNtpClient
Make Codes: porting to WIZnetInterface from EthernetInterface
- Add arrange for MAC address, call init(mac_addr) for initialing ethernet class.
- Add arrange for MAC address, call init(mac_addr) for initialing ethernet class.
UDP APIs in WIZnetInterface
NTPClient.cpp\Bind() in UDP
NTPClient.cpp\sendTo(): send in UDP
NTPClient.cpp\receiveFrom(): recv in UDP
NTPClient.cpp\Close() in UDP
Confirm packets by WireShark
- NTP version 4, clinet
- NTP version 4, server
- NTP version 4, clinet
Code Repository
I will update…
Ref. Code
#include "mbed.h"
#include "EthernetInterface.h"
#include "NTPClient.h"
EthernetInterface eth;
NTPClient ntp;
int main()
{
uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0x01, 0x02, 0x03};
//eth.init(); //Use DHCP
eth.init(mac_addr); //Use DHCP
eth.connect();
printf("Trying to update time...\r\n");
//if (ntp.setTime("0.pool.ntp.org") == 0)
if (ntp.setTime("jp.pool.ntp.org") == 0)
{
printf("Set time successfully\r\n");
time_t ctTime;
ctTime = time(NULL);
printf("Time is set to (UTC): %s\r\n", ctime(&ctTime));
}
else
{
printf("Error\r\n");
}
eth.disconnect();
while(1) {
}
}
