File content as of revision 0:04a82df0f587:

/* NTPClient.h */
/*
Copyright (C) 2012 ARM Limited.

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

#include "core/fwk.h"

#ifndef NTPCLIENT_H_
#define NTPCLIENT_H_

#define NTP_DEFAULT_PORT 123
#define NTP_DEFAULT_TIMEOUT 4000

#include "api/socket.h"

/** NTP Client to update the mbed's RTC using a remote time server
*
*/
class NTPClient
{
public:
  /**
  Instantiate the NTP client
  */
  NTPClient();

  /**Get current time (blocking)
  Update the time using the server host
  Blocks until completion
  @param host NTP server IPv4 address or hostname (will be resolved via DNS)
  @param port port to use; defaults to 123
  @param timeout waiting timeout in ms (osWaitForever for blocking function, not recommended)
  @return 0 on success, NET error code (<0) on failure
  */
  int setTime(const char* host, uint16_t port = NTP_DEFAULT_PORT, uint32_t timeout = NTP_DEFAULT_TIMEOUT); //Blocking

private:
  struct NTPPacket //See RFC 4330 for Simple NTP
  {
    //WARN: We are in LE! Network is BE!
    //LSb first
    unsigned mode : 3;
    unsigned vn : 3;
    unsigned li : 2;

    uint8_t stratum;
    uint8_t poll;
    uint8_t precision;
    //32 bits header

    uint32_t rootDelay;
    uint32_t rootDispersion;
    uint32_t refId;

    uint32_t refTm_s;
    uint32_t refTm_f;
    uint32_t origTm_s;
    uint32_t origTm_f;
    uint32_t rxTm_s;
    uint32_t rxTm_f;
    uint32_t txTm_s;
    uint32_t txTm_f;
  } __attribute__ ((packed));

};


#endif /* NTPCLIENT_H_ */