/// <summary> Read from the serial line if a useful chunk is present.
/// </summary>
/// <remarks>
/// In this case a "useful chunk" means that either the payload size
/// and endpoint of a new message or the complete payload of a message
/// are present.
/// </remarks>
/// <returns>
/// True if there was enough data to read, otherwise false.
/// </returns>
bool readAndProcess()
{
byte[] endpoint = new byte[2];
byte[] payloadSize = new byte[2];
switch (waitingState)
{
case waitingStates.NewMessage:
if (serialPort.BytesToRead >= 4)
{
// Read new payload size and endpoint
serialPort.Read(payloadSize, 0, 2);
serialPort.Read(endpoint, 0, 2);
if (BitConverter.IsLittleEndian)
{
// Data is transmitted big-endian, so flip.
Array.Reverse(payloadSize);
Array.Reverse(endpoint);
}
currentPayloadSize = BitConverter.ToUInt16(payloadSize, 0);
currentEndpoint = BitConverter.ToUInt16(endpoint, 0);
#if DEBUG
Console.WriteLine("Message metadata received:");
Console.WriteLine("\tPLS: " + currentPayloadSize.ToString());
Console.WriteLine("\tEP: " + currentEndpoint.ToString());
#endif
waitingState = waitingStates.Payload;
return(true);
}
break;
case waitingStates.Payload:
if (serialPort.BytesToRead >= currentPayloadSize)
{
// All of the payload's been received, so read it.
byte[] buffer = new byte[currentPayloadSize];
serialPort.Read(buffer, 0, currentPayloadSize);
RaiseRawMessageReceived(currentEndpoint, buffer);
// Reset state
waitingState = waitingStates.NewMessage;
currentEndpoint = 0;
currentPayloadSize = 0;
return(true);
}
break;
}
// If this hasn't returned yet there wasn't anything interesting to
// read.
return(false);
}
/// <summary> Read from the serial line if a useful chunk is present.
/// </summary>
/// <remarks>
/// In this case a "useful chunk" means that either the payload size
/// and endpoint of a new message or the complete payload of a message
/// are present.
/// </remarks>
/// <returns>
/// True if there was enough data to read, otherwise false.
/// </returns>
bool readAndProcess()
{
byte[] endpoint = new byte[2];
byte[] payloadSize = new byte[2];
switch (waitingState)
{
case waitingStates.NewMessage:
if (serialPort.BytesToRead >= 4)
{
// Read new payload size and endpoint
serialPort.Read(payloadSize, 0, 2);
serialPort.Read(endpoint, 0, 2);
if (BitConverter.IsLittleEndian)
{
// Data is transmitted big-endian, so flip.
Array.Reverse(payloadSize);
Array.Reverse(endpoint);
}
currentPayloadSize = BitConverter.ToUInt16(payloadSize, 0);
currentEndpoint = BitConverter.ToUInt16(endpoint, 0);
#if DEBUG
Console.WriteLine("Message metadata received:");
Console.WriteLine("\tPLS: " + currentPayloadSize.ToString());
Console.WriteLine("\tEP: " + currentEndpoint.ToString());
#endif
waitingState = waitingStates.Payload;
return true;
}
break;
case waitingStates.Payload:
if (serialPort.BytesToRead >= currentPayloadSize)
{
// All of the payload's been received, so read it.
byte[] buffer = new byte[currentPayloadSize];
serialPort.Read(buffer, 0, currentPayloadSize);
RaiseRawMessageReceived(currentEndpoint, buffer);
// Reset state
waitingState = waitingStates.NewMessage;
currentEndpoint = 0;
currentPayloadSize = 0;
return true;
}
break;
}
// If this hasn't returned yet there wasn't anything interesting to
// read.
return false;
}
