josx.rcxcomm
Class LLCHandler

java.lang.Object
  josx.rcxcomm.PacketHandler
      josx.rcxcomm.LLCHandler

public class LLCHandler

extends PacketHandler

Packet handler than implement the LLC packet protocol. Deals with packets and acks. Supports independent streams of data in both directions.

Field Summary

Fields inherited from class josx.rcxcomm.PacketHandler

lowerHandler

Constructor Summary

LLCHandler()

Method Summary

void	close() Close the Tower.
int	getError() Get the last error on the Tower
boolean	isAckAvailable() Check if an Ack is available
boolean	isPacketAvailable() Check if a packet is available
int	receiveAck(byte[] buffer) Receive a ack.
int	receivePacket(byte[] buffer) Receive a packet.
boolean	sendPacket(byte[] packet, int len) Send a packet.
void	setListen(boolean listen) Set or unset the listen flag to keep a PC serial tower alive

Methods inherited from class josx.rcxcomm.PacketHandler

open, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

LLCHandler

public LLCHandler()

Method Detail

getError

public int getError()

Get the last error on the Tower

Overrides:

getError in class PacketHandler

Returns:

the error number, or zero for success

setListen

public void setListen(boolean listen)

Set or unset the listen flag to keep a PC serial tower alive

Overrides:

setListen in class PacketHandler

Parameters:

listen - true to set listen mode, else false

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 the send was 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

receiveAck

public int receiveAck(byte[] buffer)

Receive a ack.

Overrides:

receiveAck in class PacketHandler

Parameters:

buffer - the buffer to receive the ack 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

isAckAvailable

public boolean isAckAvailable()

Check if an Ack is available

Overrides:

isAckAvailable in class PacketHandler

Returns:

true if ack is available, else false

close

public void close()

Close the Tower.

Overrides:

close in class PacketHandler