public async Task <string> ReadAsync(uint bufferLength)
{
String str = ""; // new StringBuilder();
GPSData gps = new GPSData();
GPSSpeed gs = new GPSSpeed();
string retVal = "GPS not initialised";
try
{
// Once we have written the contents successfully we load the stream. By getting the
//right bufferlength, we can get the read more accurate without over or under buffer read
bufferLength = await dr.LoadAsync(bufferLength);
while (dr.UnconsumedBufferLength > 0)
{
str += dr.ReadString(bufferLength) + "\n";
//if (str.Contains("GGA"))
//break;
}
if (str == "")
{
return("GPS Data not available");
}
var dataGPS = str.Substring(str.IndexOf("GGA")).Split('\n');
var dataSpeed = str.Substring(str.IndexOf("VTG")).Split('\n');
if (dataGPS.Count() > 0 && gps.SetData(dataGPS[0]))
{
retVal = string.Format("Time: {0}; Latitude: {1}; Longitude: {2}; Elevation: {3}; Satellites: {4}; ",
gps.gpsTime, gps.latitude, gps.longitude, gps.elevation, gps.satellites);
latLong = string.Format("{0}; {1}", gps.latitude, gps.longitude);
}
if (dataSpeed.Count() > 0 && gs.SetData(dataSpeed[0]))
{
retVal += string.Format("Speed in Km: {0}", gs.SpeedKM);
}
Speed = gs.SpeedKM;
}
catch (Exception ex)
{
Debug.WriteLine("Reading serial data failed!" + ex.Message);
return("");
}
return(retVal);
}
