ImprovedInstantMessage

Message Layout

{
	ImprovedInstantMessage Low NotTrusted Zerocoded
	{
		AgentData 		Single
		{   AgentID     LLUUID  }
		{	SessionID	LLUUID	}
	}
	{
		MessageBlock		Single
		{	FromGroup		BOOL	}
		{	ToAgentID		LLUUID	}
		{	ParentEstateID	U32	}
		{   RegionID		LLUUID	}
		{	Position		LLVector3	}
		{	Offline			U8	}
		{	Dialog			U8	}	
		{	ID				LLUUID	}
		{	Timestamp		U32	}
		{	FromAgentName	Variable	1	}
		{	Message			Variable	2	}
		{	BinaryBucket	Variable	2	}
	}
}

Usage and Notes

the interpretation and/or existence of values in each parameter in the packet is controlled by the value in the Dialog parameter. The current range is 0-42 and he various permutations are listed in the table below (a work in progress):

All possible interactions of Dialog byte and other packet variables

Dialog byte value	ToAgentID	ParentEstateID	RegionID	Position	ID	Timestamp	FromAgentName	Message	BinaryBucket
0 Indicates a regular IM from another agent	as expected	as expected	as expected	as expected	meaningless	as expected	as expected	as expected	empty
1 Simple notification box with an OK button	as expected	as expected	as expected	as expected
2 Used to show a countdown notification with an OK button, deprecated now
3 You've been invited to join a group									NULL-terminated string. "O" for officer, "M" for member, followed by cost to join
4 Inventory offer					Transaction ID				a list of inventory uuid and type
5 Accepted inventory offer
6 Declined inventory offer
7 Group vote
8 A message to everyone in the agent's group, deprecated
9 An object is offering its inventory
10 Accept an inventory offer from an object
11 Decline an inventory offer from an object
12 Unknown
13 Start a session, or add users to a session
14 Start a session, but don't prune offline users
15 Start a session with your group
16 Start a session without a calling card (finder or objects)
17 Send a message to a session
18 Leave a session
19 Indicates that the IM is from an object
20 Sent an IM to a busy user, this is the auto response
21 Shows the message in the console and chat history
22 Send a teleport lure
23 Response sent to the agent which inititiated a teleport invitation
24 Response sent to the agent which inititiated a teleport invitation
25 Only useful if you have Linden permissions
26 A placeholder type for future expansion, currently not used
27 Notification of a new group election, this is deprecated
28 IM to tell the user to go to an URL
29 IM for help
30 IM sent automatically on call for help, sends a lure to each Helper reached
31 Like an IM but won't go to email
32 IM from a group officer to all group members
33 Unknown
34 Unknown
35 Accept a group invitation
36 Decline a group invitation
37 Unknown
38 An avatar is offering you friendship
39 An avatar has accepted your friendship offer
40 An avatar has declined your friendship offer
41 Indicates that a user has started typing
42 Indicates that a user has stopped typing