private const int RETRYCOUNTERCOUNT = 5; // 5 retries per chunk
public void Execute()
{
// Create a request for the URL.
//string requestStr = "http://online-live1.services.u-blox.com/GetOnlineData.ashx?token=hKeEq-6GYkOIoPGNWt1z9w;gnss=gps,glo;datatype=alm";
string requestStr = "http://online-live1.services.u-blox.com/GetOnlineData.ashx?token=hKeEq-6GYkOIoPGNWt1z9w;gnss=gps,glo;datatype=eph,alm";
WebRequest request = WebRequest.Create(requestStr);
// Get the response.
WebResponse response = request.GetResponse();
string status = ((HttpWebResponse)response).StatusDescription;
Stream dataStream = response.GetResponseStream();
// convert to byte array
MemoryStream ms = new MemoryStream();
dataStream.CopyTo(ms);
byte[] array = ms.ToArray();
ms.Close();
response.Close();
// TEST
//FileStream f = new FileStream("miki.bin", FileMode.Create);
//f.Write(array, 0, array.Length);
//f.Close();
AssistArray = array;
assistPhase = eAssistPhase.START;
}
public byte[] Update(int nextChunkToSend)
{
byte[] toSend = null;
switch (assistPhase)
{
case eAssistPhase.IDLE:
// do nothing
break;
case eAssistPhase.START:
// Init transfer
ChunkIndex = 0;
RetryCounter = RETRYCOUNTERCOUNT;
assistPhase = eAssistPhase.SENDCHUNK;
break;
case eAssistPhase.SENDCHUNK:
// send chunk
int numOfChunks = (int)Math.Ceiling((double)AssistArray.Length / BYTESPERCHUNK);
if (ChunkIndex < numOfChunks)
{
toSend = SendChunk(ChunkIndex);
RetryTimer = RETRYTIMERCOUNT;
assistPhase = eAssistPhase.WAIT;
}
else
{
// DONE
assistPhase = eAssistPhase.END;
}
break;
case eAssistPhase.WAIT:
if (nextChunkToSend == (ChunkIndex + 1)) // chunk processed?
{
// send next
ChunkIndex++;
RetryCounter = RETRYCOUNTERCOUNT;
assistPhase = eAssistPhase.SENDCHUNK;
}
else if (--RetryTimer <= 0)
{
RetryCounter--;
if (RetryCounter >= 0)
{
// resend
assistPhase = eAssistPhase.SENDCHUNK;
}
else
{
// error/fail
assistPhase = eAssistPhase.FAIL;
}
}
break;
case eAssistPhase.END:
// DONE
break;
case eAssistPhase.FAIL:
// error
break;
}
return(toSend);
}
