Akinori Hashimoto / SimpleNTP

Simple Network Time Protocol Client. This lib feature: Access to SNTP server, and get Epoch (Unix) time.

SimpleNTP.cpp@0:2be905de8e28, 2015-11-25 (annotated)

Committer:
AkinoriHashimoto
Date:
Wed Nov 25 10:03:10 2015 +0000
Revision:
0:2be905de8e28
Child:
1:b5a2e4532331
Simple Network Time Protocol Client.; This lib feature: Access to SNTP server, and get Epoch (Unix) time.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AkinoriHashimoto 0:2be905de8e28 1 #include "SimpleNTP.h"
AkinoriHashimoto 0:2be905de8e28 2
AkinoriHashimoto 0:2be905de8e28 3 SimpleNTP::Result SimpleNTP::setNTPServer(string _server, unsigned short _port)
AkinoriHashimoto 0:2be905de8e28 4 {
AkinoriHashimoto 0:2be905de8e28 5 server= _server;
AkinoriHashimoto 0:2be905de8e28 6 port= _port;
AkinoriHashimoto 0:2be905de8e28 7
AkinoriHashimoto 0:2be905de8e28 8 socket.set_blocking(false, 1500);
AkinoriHashimoto 0:2be905de8e28 9 if(socket.init() == -1)
AkinoriHashimoto 0:2be905de8e28 10 return ERR_SocketInit;
AkinoriHashimoto 0:2be905de8e28 11
AkinoriHashimoto 0:2be905de8e28 12 if(serverNTP.set_address(server.c_str(), port) == -1)
AkinoriHashimoto 0:2be905de8e28 13 return ERR_SetNTPAddr;
AkinoriHashimoto 0:2be905de8e28 14
AkinoriHashimoto 0:2be905de8e28 15 return SUCCESS;
AkinoriHashimoto 0:2be905de8e28 16 }
AkinoriHashimoto 0:2be905de8e28 17
AkinoriHashimoto 0:2be905de8e28 18 long SimpleNTP::getNetworkTime()
AkinoriHashimoto 0:2be905de8e28 19 {
AkinoriHashimoto 0:2be905de8e28 20 // long timeEpoch= -1;
AkinoriHashimoto 0:2be905de8e28 21 int idx, bytes;
AkinoriHashimoto 0:2be905de8e28 22 // LeapIndicator:0(0x00), VersionNumber:4(0x100), Mode:3(0x011);
AkinoriHashimoto 0:2be905de8e28 23 // -> 0b0010 0011 = 0x23
AkinoriHashimoto 0:2be905de8e28 24 char req[49];
AkinoriHashimoto 0:2be905de8e28 25 for(idx= 0; idx < 48; idx++)
AkinoriHashimoto 0:2be905de8e28 26 req[idx]= 0x00;
AkinoriHashimoto 0:2be905de8e28 27 req[48]= NULL;
AkinoriHashimoto 0:2be905de8e28 28 req[0]= 0x23;
AkinoriHashimoto 0:2be905de8e28 29 bytes= socket.sendTo(serverNTP, (char *)req, 48);
AkinoriHashimoto 0:2be905de8e28 30 if(bytes == -1)
AkinoriHashimoto 0:2be905de8e28 31 return -1;
AkinoriHashimoto 0:2be905de8e28 32
AkinoriHashimoto 0:2be905de8e28 33 // NTP response is max 68 Byte (EXPECTED).
AkinoriHashimoto 0:2be905de8e28 34 char resSNTP[70];
AkinoriHashimoto 0:2be905de8e28 35 bytes= socket.receiveFrom(serverNTP, resSNTP, sizeof(resSNTP));
AkinoriHashimoto 0:2be905de8e28 36 if(bytes == -1)
AkinoriHashimoto 0:2be905de8e28 37 return -1;
AkinoriHashimoto 0:2be905de8e28 38
AkinoriHashimoto 0:2be905de8e28 39 // RFC2030; Transmit TimeStamp[40-48Byte]:BigEndian 32bit unsigned long (dec), + 32bit under floating-point.
AkinoriHashimoto 0:2be905de8e28 40 unsigned long timeNTP= 0;
AkinoriHashimoto 0:2be905de8e28 41 for(idx = 0; idx < 4; idx++)
AkinoriHashimoto 0:2be905de8e28 42 timeNTP= (timeNTP << 8) | resSNTP[40+ idx];
AkinoriHashimoto 0:2be905de8e28 43
AkinoriHashimoto 0:2be905de8e28 44 // 　25567day * 24h * 60m * 60s = 2208988800 s. w/o leap seconds(DEFINED).
AkinoriHashimoto 0:2be905de8e28 45 // Epoch: 1970/01/01~. NTP:1900/01/01~
AkinoriHashimoto 0:2be905de8e28 46 // timeEpoch= timeNTP- 2208988800;
AkinoriHashimoto 0:2be905de8e28 47 return timeNTP- 2208988800;//timeEpoch;
AkinoriHashimoto 0:2be905de8e28 48 }
AkinoriHashimoto 0:2be905de8e28 49
AkinoriHashimoto 0:2be905de8e28 50
AkinoriHashimoto 0:2be905de8e28 51 // EOF