IP Chat Engine

	IP Chat Engine
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I provide this information in case somebody feels like building an alternative/better client (e.g. for the Mac). The IPchat protocol is fairly simple and all you need to build your own chat engine is a way of sending and receiving UDP datagrams via port #1499 and the following information:

IPchat datagrams consist of the following 4 blocks:

<header><senderIP><code><message>

where

<header>	Always the string DIP.
<senderIP>	The IP address of the sender in brackets (the IP address is in dotted string format xxx.xxx.xxx.xxx); for example, if the sender's IP address is 180.10.55.77 then this second block would equal [180.10.55.77].
<code>	1 character command code (see table below).
<message>	Any string terminated with the NULL character 0C (an empty message consists of the NULL character only).

The following table lists all the possible command codes, their meaning, the kind of message that follows them, and how the receiver is supposed to behave once the whole packet is received (note that all strings must be terminated with the NULL character 0C):


A	meaning	acknowledge HAIL
	<message>	sleep code of sender (i.e. "S" or "s")
	receiver action	optional feedback into chat output window
	example	DIP[205.75.230.200]AS

B	meaning	BYE
	<message>	no message (i.e. only NULL character 0C)
	receiver action	remove sender from chat list
	example	DIP[205.75.230.200]B

c	meaning	information about sender: comment field
	<message>	any string
	receiver action	show information about sender
	example	DIP[205.75.230.200]cget DynamIP from http://www.bigfoot.com/~DynamIP/

D	meaning	distribute IP address of chat participant
	<message>	IP address in dotted string format
	receiver action	scan IP address and verify existence of IPchat client
	example	DIP[205.75.230.200]D205.75.230.184

d	meaning	information about sender: local date/time
	<message>	date/time in the following format: dd-mm-yy hh:mm:ss
	receiver action	display information about sender
	example	DIP[205.75.230.200]d23-03-97 14:48:31

e	meaning	information about sender: e-mail address
	<message>	e-mail address
	receiver action	display information about sender
	example	DIP[205.75.230.200]eDynamIP@bigfoot.com

E	meaning	request e-mail address
	<message>	no message (i.e. only NULL character 0C)
	receiver action	return e-mail address
	example	DIP[205.75.230.200]E

F	meaning	return e-mail address
	<message>	e-mail address
	receiver action	start e-mail client and create new message with appropriate recipient
	example	DIP[205.75.230.200]FDynamIP@bigfoot.com

H	meaning	HAIL
	<message>	no message (i.e. only NULL character 0C)
	receiver action	notify user and return command "acknowledge HAIL"
	example	DIP[205.75.230.200]H

h	meaning	information about sender: handle
	<message>	handle
	receiver action	display information about sender
	example	DIP[205.75.230.200]hcmu

I	meaning	request info
	<message>	no message (i.e. only NULL character 0C)
	receiver action	return info about user to sender (handle, name, e-mail, URL, location, date/time, comment, version)
	example	DIP[205.75.230.200]I

i	meaning	information about sender: URL
	<message>	no message (i.e. only NULL character 0C)
	receiver action	display information about sender
	example	DIP[205.75.230.200]ihttp://www.bigfoot.com/~cmu/

l	meaning	information about sender: location
	<message>	location
	receiver action	display information about sender
	example	DIP[205.75.230.200]lPalo Alto, CA

M	meaning	message
	<message>	any text
	receiver action	notify user and display text in chat output window; send command "acknowledge message" back to sender
	example	DIP[205.75.230.200]Mhello

m	meaning	acknowledge message
	<message>	sleep code
	receiver action	notify user that message was delivered
	example	DIP[205.75.230.200]ms

n	meaning	information about sender: name
	<message>	name
	receiver action	display information about sender
	example	DIP[205.75.230.200]nChristoph Mueller

P	meaning	POLL
	<message>	first character of message is sleep code of sender (i.e. "S" or "s"); the rest of the message is the handle of the sender.
	receiver action	add sender to chat list and return command "acknowledge POLL"
	example	DIP[205.75.230.200]Pscmu

p	meaning	acknowledge POLL
	<message>	first character of message is sleep code of sender (i.e. "S" or "s"); the rest of the message is the handle of the sender.
	receiver action	add sender to chat list
	example	DIP[205.75.230.200]pscmu

S	meaning	sleep ON
	<message>	no message (i.e. only NULL character 0C)
	receiver action	update chat list (sender went into sleep mode)
	example	DIP[205.75.230.200]S

s	meaning	sleep OFF
	<message>	no message (i.e. only NULL character 0C)
	receiver action	update chat list (sender woke up from sleep mode)
	example	DIP[205.75.230.200]s

T	meaning	text
	<message>	any text
	receiver action	display text in chat output window
	example	DIP[205.75.230.200]Thello

t	meaning	private text
	<message>	any text
	receiver action	display text in chat output window and make user aware of the fact that this text was sent as private text
	example	DIP[205.75.230.200]thello

U	meaning	request URL
	<message>	no message (i.e. only NULL character 0C)
	receiver action	send command "acknowledge URL" to sender
	example	DIP[205.75.230.200]U

u	meaning	acknowledge URL
	<message>	URL
	receiver action	load browser and display URL
	example	DIP[205.75.230.200]uhttp://www.bigfoot.com/~cmu/

v	meaning	information about sender: version
	<message>	version string
	receiver action	display information about sender
	example	DIP[205.75.230.200]vDynamIP v3.04

X	meaning	request NetMeeting
	<message>	NetMeeting SpeedDial (the *.cnf file)
	receiver action	load NetMeeting and call the sender; send back command "acknowledge NetMeeting request" or "NetMeeting error"
	example	DIP[205.75.230.200]X<*.cnf file>

x	meaning	acknowledge NetMeeting request
	<message>	sleep code
	receiver action	notify user that request was delivered successfully
	example	DIP[205.75.230.200]xs

y	meaning	NetMeeting error
	<message>	sleep code
	receiver action	notify user that request was delivered successfully but declined
	example	DIP[205.75.230.200]ys

Last modified: March 30, 1999
OFFLINE visitors since May 1, 1998

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