ETFTP - Enhanced Trivial File Transfer Protocol. Adaptive transmission
protocol for radio based data transmission.
Copyright (C) 1997, 1998 Defence Research Establishment, Dept. of Comm.
Systems, FOA 72, Sweden.
Currently maintained by Christian Jönsson FOA 72 <chj@lin.foa.se> and
Torbjörn Frostemark FOA 72 <torfr@lin.foa.se>.

This file is part of ETFTP version 1.1.3

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; see the file GPL.  If not, write to the
    Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.


*********************************************************************
*** Things that have been done between version 1.1.2 and 1.1.3.
*********************************************************************

Fixed bug with integer divisions in timers; lDATAsleep, alarmTimeout.

*********************************************************************
*** Things that have been done between version 1.1.1 and 1.1.2.
*********************************************************************

Packet Size
===========

   Maximum block size is increased to 1900 bytes data.  The buffer is
2048 bytes, so why not use more of it.  But remember that packet sizes
over 1500 bytes could cause fragmentation in your network (if your MTU
is less).


Baudrate
========

   Maximum baudrate is increased to a maximum of 1000000 (1 Mbps).
This makes a waiting period of zero seconds even with large packet
size and burst size.  For fast connection only.


*********************************************************************
*** Things that have been done between version 1.1 and 1.1.1.
*********************************************************************

   Silly change in src/Makefile.in to install both an in.etftpd and
an etftpd. 

*********************************************************************
*** Things that have been done between version 1.0 and 1.1.
*********************************************************************

Timers
======

   The big difference is that the timers have been trimmed since the
protocol could be tested in its real environment.  All timers are now
measured in seconds, even the burst rate, which makes this version
incompatible with previous ones.  Therefore the running version of
ETFTP is displayed when the status command is given in the interactive
client mode.


* Round Trip Timer

   The round trip timer has been implemented to measure the time
between a packet sent and a packet received.  This had to be
implemented differently on server and client side. The client measures
its round trip timer as the time between sending the OPEN packet and
the receiving of the RESPONSE packet.  This works in both PUT mode
and GET mode.

   The server side is a little more troublesome, since the packet flow
is different in the PUT mode and GET mode.  In GET mode the round trip
timer measures the time between sending the RESPONSE packet and the
receiving of the CONTROL_GO packet.  The PUT mode is the more tricky
one since we have to wait between sending CONTROL_GO and the receiving
of the first DATA packet.  The DATA packet is usually much larger than
the CONTROL_GO packet, and the time it takes to receive it is
therefore subtracted from the round trip timer.


* Radio delay

   The radio delay is added to every channel turnaround.


Debug info
==========

   When the server is started with -v a file called
debug.etftpd.XXXXXXXXX is created in /var/log/ where XXXXXXXXX is a
time stamp.