lejos.nxt.rcxcomm
Class LLCReliableHandler

java.lang.Object
  lejos.nxt.rcxcomm.PacketHandler
      lejos.nxt.rcxcomm.LLCReliableHandler

public class LLCReliableHandler
extends PacketHandler

A Packet handler that guarantees reliable delivery using checksums, acks, and a single bit sequence number.

Field Summary

Fields inherited from class lejos.nxt.rcxcomm.PacketHandler

lowerHandler

Constructor Summary

LLCReliableHandler(PacketHandler handler)

Method Summary

boolean	isPacketAvailable() Check if a packet is available.
int	receivePacket(byte[] buffer) Receive a packet.
void	reset() Reset sequence numbers.
boolean	sendPacket(byte[] packet, int len) Send a packet.

Methods inherited from class lejos.nxt.rcxcomm.PacketHandler

close, getError, isAckAvailable, open, receiveAck, setListen

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LLCReliableHandler

public LLCReliableHandler(PacketHandler handler)

Method Detail

reset

public void reset()

Reset sequence numbers.

Overrides:

reset in class PacketHandler

sendPacket

public boolean sendPacket(byte[] packet,
                          int len)

Send a packet.

Specified by:

sendPacket in class PacketHandler

Parameters:

packet - the bytes to send

len - the number of bytes to send

Returns:

true if send successful, else false

receivePacket

public int receivePacket(byte[] buffer)

Receive a packet.

Specified by:

receivePacket in class PacketHandler

Parameters:

buffer - the buffer to receive the packet into

Returns:

the number of bytes received

isPacketAvailable

public boolean isPacketAvailable()

Check if a packet is available.

Specified by:

isPacketAvailable in class PacketHandler

Returns:

true if a packet is available, else false