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);
}
}
/// <summary>
/// Initializes a new instance of class <see cref="XBeePacket"/>.
/// </summary>
protected XBeePacket()
{
checksum = new XBeeChecksum();
}
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);
}
}
/// <summary>
/// Initializes a new instance of class <see cref="XBeePacket"/>.
/// </summary>
protected XBeePacket()
{
checksum = new XBeeChecksum();
}
