/// <summary>
/// Generates the XBee packet byte array.
/// </summary>
/// <remarks>Use only while working in API mode 1. If API mode is 2, use<see cref="GenerateByteArrayEscaped"/>.</remarks>
/// <returns>The XBee packet byte array.</returns>
/// <seealso cref="GenerateByteArrayEscaped"/>
public byte[] GenerateByteArray()
{
checksum.Reset();
byte[] packetData = GetPacketData();
using (var os = new MemoryStream())
{
os.WriteByte(SpecialByte.HEADER_BYTE.GetValue());
if (packetData != null)
{
byte[] Length = ByteUtils.ShortToByteArray((short)packetData.Length);
var msb = Length[0];
var lsb = Length[1];
os.WriteByte(msb);
os.WriteByte(lsb);
for (int i = 0; i < packetData.Length; i++)
{
checksum.Add(packetData[i]);
os.WriteByte(packetData[i]);
}
}
else
{
os.WriteByte(0);
os.WriteByte(0);
}
os.WriteByte((byte)(checksum.Generate() & 0xFF));
return(os.ToArray());
}
}
public XBeePacket ParsePacket(SerialPort serialPort, OperatingMode mode)
{
Contract.Requires <ArgumentNullException>(serialPort != null, "Input stream cannot be null.");
Contract.Requires <ArgumentException>(serialPort.IsOpen);
Contract.Requires <ArgumentException>(mode == OperatingMode.API || mode == OperatingMode.API_ESCAPE, "Operating mode must be API or API Escaped.");
try
{
// Read packet size.
int hSize = ReadByte(serialPort, mode);
int lSize = ReadByte(serialPort, mode);
int Length = hSize << 8 | lSize;
// Read the payload.
byte[] payload = ReadBytes(serialPort, mode, Length);
// Calculate the expected checksum.
XBeeChecksum checksum = new XBeeChecksum();
checksum.Add(payload);
byte expectedChecksum = (byte)(checksum.Generate() & 0xFF);
// Read checksum from the input stream.
byte readChecksum = (byte)(ReadByte(serialPort, mode) & 0xFF);
// Verify the checksum of the read bytes.
if (readChecksum != expectedChecksum)
{
throw new InvalidPacketException("Invalid checksum (expected 0x"
+ HexUtils.ByteToHexString(expectedChecksum) + ").");
}
return(ParsePayload(payload));
}
catch (IOException e)
{
throw new InvalidPacketException("Error parsing packet: " + e.Message, e);
}
}
public XBeePacket ParsePacket(SerialPort serialPort, OperatingMode mode)
{
Contract.Requires<ArgumentNullException>(serialPort != null, "Input stream cannot be null.");
Contract.Requires<ArgumentException>(serialPort.IsOpen);
Contract.Requires<ArgumentException>(mode == OperatingMode.API || mode == OperatingMode.API_ESCAPE, "Operating mode must be API or API Escaped.");
try
{
// Read packet size.
int hSize = ReadByte(serialPort, mode);
int lSize = ReadByte(serialPort, mode);
int Length = hSize << 8 | lSize;
// Read the payload.
byte[] payload = ReadBytes(serialPort, mode, Length);
// Calculate the expected checksum.
XBeeChecksum checksum = new XBeeChecksum();
checksum.Add(payload);
byte expectedChecksum = (byte)(checksum.Generate() & 0xFF);
// Read checksum from the input stream.
byte readChecksum = (byte)(ReadByte(serialPort, mode) & 0xFF);
// Verify the checksum of the read bytes.
if (readChecksum != expectedChecksum)
throw new InvalidPacketException("Invalid checksum (expected 0x"
+ HexUtils.ByteToHexString(expectedChecksum) + ").");
return ParsePayload(payload);
}
catch (IOException e)
{
throw new InvalidPacketException("Error parsing packet: " + e.Message, e);
}
}
