public static bool UpdateTimeFromNtpServer(string server, int timeZoneOffset)
{
bool updateSuccessfull = false;
DebugUtils.Print(DebugLevel.INFO, "Updating time on server " + server + " with time zone offset of " + timeZoneOffset + " hours.");
try
{
var currentTime = GetNtpTime(server, timeZoneOffset);
if (currentTime == DateTime.MinValue)
{
DebugUtils.Print(DebugLevel.WARNING, "Failed to perform time update. Please check internet connection and/or gateway configuration.");
}
else
{
Microsoft.SPOT.Hardware.Utility.SetLocalTime(currentTime);
DebugUtils.Print(DebugLevel.INFO, "Successfully updated time on device.");
updateSuccessfull = true;
}
}
catch
{
DebugUtils.Print(DebugLevel.WARNING, "Failed to perform time update. Internal error.");
}
return(updateSuccessfull);
}
/// <summary>
/// Starts the http server thread
/// </summary>
public void Start()
{
running = true;
httpServerThread = new Thread(StartServer);
RequestReceived += new GetRequestHandler(ProcessClientRequest);
try
{
stop = false;
httpServerThread.Start();
}
catch (Exception)
{
DebugUtils.Print(DebugLevel.ERROR, "Starting HTTP Server Thread failed.");
stop = true;
running = false;
}
}
public static HTTPHeader Parse(string rawHeader)
{
if (rawHeader == null)
{
return(null);
}
HTTPHeader header = new HTTPHeader();
try
{
//Split raw data into lines
string[] lines = rawHeader.Split(new char[] { '\n' });
for (int i = 0; i < lines.Length; i++)
{
if (lines[i] != null && lines[i].IndexOf(':') > -1)
{
//Remove line breaks and carriage returns
lines[i] = lines[i].Replace("\n", "").Replace("\r", "");
//Split at all ':', first substring is the header name
string headerName = lines[i].Split(new char[] { ':' })[0];
//Substring after ':' is headerValue
string headerValue = lines[i].Substring(lines[i].IndexOf(':') + 2);
//Add header to list
header.Add(headerName, headerValue);
}
}
}
catch (Exception e)
{
DebugUtils.Print(DebugLevel.ERROR, "Failed to parse raw data into HTTP header.");
DebugUtils.Print(DebugLevel.ERROR, e.StackTrace);
}
return(header);
}
/// <summary>
/// Get DateTime from NTP Server
/// Based on:
/// http://weblogs.asp.net/mschwarz/archive/2008/03/09/wrong-datetime-on-net-micro-framework-devices.aspx
/// </summary>
/// <param name="timeServer">Time Server (NTP) address</param>
/// <param name="timeZoneOffset">Difference in hours from UTC</param>
/// <returns>Local NTP Time</returns>
private static DateTime GetNtpTime(String timeServer, int timeZoneOffset)
{
try
{
DebugUtils.Print(DebugLevel.INFO, "Searching for time server dns endpoint...");
// Find endpoint for TimeServer
var ep = new IPEndPoint(Dns.GetHostEntry(timeServer).AddressList[0], 123);
// Make send/receive buffer
var ntpData = new byte[48];
DebugUtils.Print(DebugLevel.INFO, "Trying to connect to time server...");
// Connect to TimeServer
using (var s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
{
// Set 10s send/receive timeout and connect
s.SendTimeout = s.ReceiveTimeout = 10000; // 10,000 ms
s.Connect(ep);
// Set protocol version
ntpData[0] = 0x1B;
// Send Request
s.Send(ntpData);
// Receive Time
s.Receive(ntpData);
// Close the socket
s.Close();
DebugUtils.Print(DebugLevel.INFO, "Time data successfully received.");
}
const byte offsetTransmitTime = 40;
ulong intpart = 0;
ulong fractpart = 0;
for (var i = 0; i <= 3; i++)
{
intpart = (intpart << 8) | ntpData[offsetTransmitTime + i];
}
for (var i = 4; i <= 7; i++)
{
fractpart = (fractpart << 8) | ntpData[offsetTransmitTime + i];
}
ulong milliseconds = (intpart * 1000 + (fractpart * 1000) / 0x100000000L);
var timeSpan = TimeSpan.FromTicks((long)milliseconds * TimeSpan.TicksPerMillisecond);
var dateTime = new DateTime(1900, 1, 1);
dateTime += timeSpan;
var offsetAmount = new TimeSpan(timeZoneOffset, 0, 0);
var networkDateTime = (dateTime + offsetAmount);
return(networkDateTime);
}
catch (Exception)
{
DebugUtils.Print(DebugLevel.WARNING, "Failed to connect to time server.");
return(DateTime.MinValue);
}
}
