public static AprsMessage Parse(string rawData)
{
try
{
var match = Constants.Regexes.CallsignRegex.Match(rawData);
var aprsMessage = new AprsMessage
{
RawData = rawData,
ReceivedDate = DateTime.UtcNow,
Callsign = match.Groups[1].Value
};
rawData = match.Groups[2].Value;
match = Regex.Match(rawData, @"^([^\:]*)\:(.*)$");
aprsMessage.StationRoute = new ReadOnlyCollection <string>(match.Groups[1].Value.Split(','));
rawData = match.Groups[2].Value;
if (string.IsNullOrEmpty(rawData))
{
return(null);
}
DataType dataType;
if (!Constants.Maps.DataTypeMap.TryGetValue(Convert.ToByte(rawData[0]), out dataType))
{
throw new ArgumentException("Unsupported data type in raw data", nameof(rawData));
}
aprsMessage.DataType = dataType;
Symbol symbol;
switch (aprsMessage.DataType)
{
case DataType.CurrentMicE:
Latitude latitude;
short longitudeOffset;
LongitudeHemisphere longitudeHemisphere;
MicEMessageType micEMessageType;
DecodeMicEDestinationAddress(
aprsMessage.StationRoute[0],
out latitude,
out longitudeOffset,
out longitudeHemisphere,
out micEMessageType);
aprsMessage.Latitude = latitude;
aprsMessage.MicEMessageType = micEMessageType;
var longitudeDegrees = (short)(rawData[1] - 28 + longitudeOffset);
if (180 <= longitudeDegrees && longitudeDegrees <= 189)
{
longitudeDegrees -= 80;
}
else if (190 <= longitudeDegrees && longitudeDegrees <= 199)
{
longitudeDegrees -= 190;
}
aprsMessage.Longitude = new Longitude(
longitudeDegrees,
(short)((rawData[2] - 28) % 60),
(rawData[3] - 28) * 0.6,
longitudeHemisphere,
latitude.Ambiguity);
var speedCourseSharedByte = rawData[5] - 28;
aprsMessage.Speed =
Speed.FromKnots(((rawData[4] - 28) * 10 + (int)Math.Floor(speedCourseSharedByte / 10.0)) %
800);
aprsMessage.Direction =
new Heading((short)((speedCourseSharedByte % 10 * 100 + (rawData[6] - 28)) % 400), 0, 0);
{
var symbolTableSelector = rawData[8];
if (symbolTableSelector != '/' &&
symbolTableSelector != '\\')
{
aprsMessage.SymbolOverlay = symbolTableSelector;
aprsMessage.SymbolTable = Constants.Maps.SymbolTableMap['\\']; //Take the secondary table
}
else
{
aprsMessage.SymbolTable = Constants.Maps.SymbolTableMap[symbolTableSelector];
}
}
if ((aprsMessage.SymbolTable == SymbolTable.Primary
? Constants.Maps.PrimarySymbolTableSymbolMap
: Constants.Maps.SecondarySymbolTableSymbolMap).TryGetValue(rawData[7], out symbol))
{
aprsMessage.Symbol = symbol;
}
else
{
aprsMessage.Symbol = null;
}
if (rawData.Length > 12 && rawData[12] == '}')
{
aprsMessage.Altitude =
Altitude.FromMetersAboveBaseline(ConvertFromBase91(rawData.Substring(9, 3)));
}
break;
case DataType.PositionWithoutTimestampWithAprsMessaging:
case DataType.PositionWithoutTimestampNoAprsMessaging:
aprsMessage.Latitude = new Latitude(Convert.ToInt16(rawData.Substring(1, 2)),
Convert.ToDouble(rawData.Substring(3, 5)),
rawData[8] == 'N' ? LatitudeHemisphere.North : LatitudeHemisphere.South);
{
var symbolTableSelector = rawData[9];
if (symbolTableSelector != '/' &&
symbolTableSelector != '\\')
{
aprsMessage.SymbolOverlay = symbolTableSelector;
aprsMessage.SymbolTable = Constants.Maps.SymbolTableMap['\\']; //Take the secondary table
}
else
{
aprsMessage.SymbolTable = Constants.Maps.SymbolTableMap[symbolTableSelector];
}
}
aprsMessage.Longitude = new Longitude(Convert.ToInt16(rawData.Substring(10, 3)),
Convert.ToDouble(rawData.Substring(13, 5)),
rawData[18] == 'E' ? LongitudeHemisphere.East : LongitudeHemisphere.West);
if ((aprsMessage.SymbolTable == SymbolTable.Primary
? Constants.Maps.PrimarySymbolTableSymbolMap
: Constants.Maps.SecondarySymbolTableSymbolMap).TryGetValue(rawData[19], out symbol))
{
aprsMessage.Symbol = symbol;
}
else
{
aprsMessage.Symbol = null;
}
rawData = rawData.Substring(20);
if (Regex.IsMatch(rawData, @"^\d\d\d\\\d\d\d"))
{
aprsMessage.Direction = new Heading(Convert.ToInt16(rawData.Substring(0, 3)), 0, 0);
aprsMessage.Speed = Speed.FromKnots(Convert.ToDouble(rawData.Substring(4, 3)));
rawData = rawData.Substring(7);
}
if (Constants.Regexes.AltitudeRegex.IsMatch(rawData))
{
aprsMessage.Altitude =
Altitude.FromFeetAboveSeaLevel(
Convert.ToInt32(Constants.Regexes.AltitudeRegex.Match(rawData).Groups[1].Value));
}
// OGN FLAVORED STUFF
if (Regex.IsMatch(rawData, @"([\+\-]\d\d\d)fpm"))
{
aprsMessage.ClimbRate =
Convert.ToInt16(Regex.Match(rawData, @"([\+\-]\d\d\d)fpm").Groups[1].Value);
}
if (Regex.IsMatch(rawData, @"([\+\-]\d.\d)rot"))
{
aprsMessage.TurnRate =
Convert.ToDouble(Regex.Match(rawData, @"([\+\-]\d.\d)rot").Groups[1].Value);
}
// ToDo: In case OGN flavored aprs is enabled add the precision enhancement, clibrate and turnrate.
break;
case DataType.PositionWithTimestampWithAprsMessaging:
case DataType.PositionWithTimestampNoAprsMessaging:
if (Regex.IsMatch(rawData.Substring(1), @"^(\d\d\d\d\d\d)h"))
{
rawData = rawData.Substring(8);
}
else
{
return(null);
}
aprsMessage.Latitude = new Latitude(Convert.ToInt16(rawData.Substring(0, 2)),
Convert.ToDouble(rawData.Substring(2, 5)),
rawData[7] == 'N' ? LatitudeHemisphere.North : LatitudeHemisphere.South);
SymbolTable symbolTable;
if (!Constants.Maps.SymbolTableMap.TryGetValue(rawData[8], out symbolTable))
{
return(null);
}
aprsMessage.SymbolTable = symbolTable;
aprsMessage.Longitude = new Longitude(Convert.ToInt16(rawData.Substring(9, 3)),
Convert.ToDouble(rawData.Substring(12, 5)),
rawData[17] == 'E' ? LongitudeHemisphere.East : LongitudeHemisphere.West);
if ((aprsMessage.SymbolTable == SymbolTable.Primary
? Constants.Maps.PrimarySymbolTableSymbolMap
: Constants.Maps.SecondarySymbolTableSymbolMap).TryGetValue(rawData[18], out symbol))
{
aprsMessage.Symbol = symbol;
}
else
{
aprsMessage.Symbol = null;
}
short direction;
if (!Int16.TryParse(rawData.Substring(19, 3), out direction))
{
return(null);
}
aprsMessage.Direction = new Heading(direction, 0, 0);
aprsMessage.Speed = Speed.FromKnots(Convert.ToDouble(rawData.Substring(23, 3)));
rawData = rawData.Substring(26);
if (Constants.Regexes.AltitudeRegex.IsMatch(rawData))
{
aprsMessage.Altitude =
Altitude.FromFeetAboveSeaLevel(
Convert.ToInt32(Constants.Regexes.AltitudeRegex.Match(rawData).Groups[1].Value));
}
// OGN FLAVORED STUFF
if (Regex.IsMatch(rawData, @"([\+\-]\d\d\d)fpm"))
{
aprsMessage.ClimbRate =
Convert.ToInt16(Regex.Match(rawData, @"([\+\-]\d\d\d)fpm").Groups[1].Value);
}
if (Regex.IsMatch(rawData, @"([\+\-]\d.\d)rot"))
{
aprsMessage.TurnRate =
Convert.ToDouble(Regex.Match(rawData, @"([\+\-]\d.\d)rot").Groups[1].Value);
}
break;
}
return(aprsMessage);
}
catch
{
return(null);
}
}