// handle next frame
public void receivedNewFrame(EZFrame frame)
{
// sending acknowledgement
NetDevice.sendAcknowledge(PacketSenderID);
// copying payload bytes into the packet
int i;
int startindex = EZRoboNetDevice.MAX_FRAME_PAYLOAD_LENGTH * FramesReceived;
for (i = 0; i < frame.PayloadLength; i++)
{
CurrentPacket[startindex + i] = frame.Payload[i];
}
// frame payload copied
// increasing number of received frames
FramesReceived++;
// now changing state
if (FramesReceived == TotalFrames)
{
state = EZRoboNetDevice.stPacketReady;
}
else
{
state = EZRoboNetDevice.stReceiving;
// marking time for next frame arrival possible timeout
FrameReceptionStartTime = DateTime.Now;
}
}
public EZStationPacketFSM(EZRoboNetDevice device, EZFrame frame)
{
// registering the Net Device
NetDevice = device;
// capturing time of first reception
ReceptionStartTime = DateTime.Now;
// acknowledging
NetDevice.sendAcknowledge(PacketSenderID);
// retrieving sender id
PacketSenderID = frame.SenderID;
// calculating total packet length
ushort packetlength = (ushort)(frame.Payload[3] + 256 * frame.Payload[4] + 5);
CurrentPacketLength = packetlength;
// calculating total number of frames required for full packet transmission
TotalFrames = packetlength / EZRoboNetDevice.MAX_FRAME_PAYLOAD_LENGTH + 1;
// allocating memory space for the packet being received
CurrentPacket = new byte[packetlength];
// now filling initial space in CurrentPacket
int i;
for (i = 0; i < frame.PayloadLength; i++)
{
CurrentPacket[i] = frame.Payload[i];
}
// done copying
// setting number of frames received to 1
FramesReceived = 1;
// sending an acknowledgement frame
NetDevice.sendAcknowledge(frame.SenderID);
if (FramesReceived < TotalFrames)
{ // need to receive more
state = EZRoboNetDevice.stReceiving;
// marrking time of acknowledgement
FrameReceptionStartTime = DateTime.Now;
}
else
{
state = EZRoboNetDevice.stPacketReady;
FramesReceived = 0;
TotalFrames = 0;
}
}