rcx.josx.rcxcomm
Class LNPHandler

java.lang.Object
  rcx.josx.rcxcomm.PacketHandler
      rcx.josx.rcxcomm.LNPHandler

public class LNPHandler
extends PacketHandler

A Packet handler that implements the outer LNP packet format. It uses the Tower call to send and receive LNP packets.

Constructor Summary

LNPHandler()
Creates an LNP packet handler and opens the tower

Method Summary

void	close() Close the Tower.
int	getError() Get the last error on the Tower
boolean	isAddressing() Test if last received packet is addressing (or integrity)
boolean	isPacketAvailable() Check if a packet is available
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 rcx.josx.rcxcomm.PacketHandler

isAckAvailable, open, receiveAck, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

LNPHandler

public LNPHandler()

Creates an LNP packet handler and opens the tower

Method Detail

isAddressing

public boolean isAddressing()

Test if last received packet is addressing (or integrity)

Returns:

true if an addressing packet, false if an integrity packet

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

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

close

public void close()

Close the Tower.

Overrides:

close in class PacketHandler