static void UpdateRTCFromNetwork()
{
SIM800H.SntpClient.SyncNetworkTimeAsync("time.nist.gov", TimeSpan.Zero, (ar) =>
{
// update RTC only if update was successful
if (((SyncNetworkTimeAsyncResult)ar).Result == SyncResult.SyncSuccessful)
{
// get current date time and update RTC
DateTime rtcValue = SIM800H.GetDateTime();
// set framework date time
Utility.SetLocalTime(rtcValue);
// done here, dispose SNTP client to free up memory
SIM800H.SntpClient.Dispose();
SIM800H.SntpClient = null;
new Thread(() =>
{
Thread.Sleep(1000);
// start doing the thing with IoT Hub...
StartDeviceOperation();
}).Start();
}
else
{
Debug.Print("### failed to get time from NTP server ###");
}
});
}
static void UpdateRTCFromNetwork()
{
Console.WriteLine("... requesting time from NTP server ...");
//////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////
// the following code block uses an async call to SNTP client which should be OK for most of the use scenarios
// check an alternative in the code block commented bellow
SIM800H.SntpClient.SyncNetworkTimeAsync("pool.ntp.org", TimeSpan.Zero, (ar) =>
{
// update RTC only if update was successful
if (((SyncNetworkTimeAsyncResult)ar).Result == SyncResult.SyncSuccessful)
{
// get current date time and update RTC
DateTime rtcValue = SIM800H.GetDateTime();
// set framework date time
Rtc.SetSystemTime(rtcValue);
Console.WriteLine("!!! new time from NTP server: " + rtcValue.ToString());
// done here, dispose SNTP client to free up memory
SIM800H.SntpClient.Dispose();
SIM800H.SntpClient = null;
}
else
{
Console.WriteLine("### failed to get time from NTP server ###");
}
});
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// if your network connection is not that good and you definitely need a valid RTC better do this inside a try/catch AND using a retry strategy
// the implementation bellow uses a synchronous call to SNTP client
// for the simplest async call see the
//byte retryCounter = 0;
//while (retryCounter <= 3)
//{
// try
// {
// var result = SIM800H.SntpClient.SyncNetworkTimeAsync("time.nist.gov", TimeSpan.Zero).End();
// // check result
// if (result == SyncResult.SyncSuccessful)
// {
// // get current date time and update RTC
// DateTime rtcValue = SIM800H.GetDateTime();
// // set framework date time
// Rtc.SetSystemTime(rtcValue);
// Console.WriteLine("!!! new time from NTP server: " + rtcValue.ToString());
// // done here, dispose SNTP client to free up memory
// SIM800H.SntpClient.Dispose();
// SIM800H.SntpClient = null;
// return;
// }
// else
// {
// Console.WriteLine("### failed to get time from NTP server ###");
// }
// }
// catch
// {
// // failed updating RTC
// // flag this
// }
// // add retry
// retryCounter++;
// // progressive wait 15*N seconds before next retry
// Thread.Sleep(15000 * retryCounter);
//}
}