IS MSO - Revision history

Flame CZE at 21:52, 13 February 2026

2026-02-13T21:52:19Z

Flame CZE at 21:33, 13 February 2026

2026-02-13T21:33:59Z

Flame CZE at 21:32, 13 February 2026

2026-02-13T21:32:32Z

Bokujishin at 18:35, 9 February 2026

2026-02-09T18:35:16Z

Bokujishin at 18:34, 9 February 2026

2026-02-09T18:34:05Z

Bokujishin at 18:19, 9 February 2026

2026-02-09T18:19:11Z

Bokujishin: Created page with "== Introduction == The '''MS'''g '''O'''ut packet is a variable-size packet containing text messages sent by LFS. Messages that appear in-game are sent to external programs...."

2026-02-09T18:17:59Z

Created page with "== Introduction == The '''MS'''g '''O'''ut packet is a variable-size packet containing text messages sent by LFS. Messages that appear in-game are sent to external programs...."

New page

== Introduction ==

The '''MS'''g '''O'''ut packet is a variable-size packet containing text messages sent by LFS. Messages that appear in-game are sent to external programs. Hidden messages typed with <code>/o message</code> are also reported.

<big><pre style="tab-size:4">struct IS_MSO // MSg Out - system messages and user messages - variable size
{
byte Size; // 12, 16, 20... 136 depending on Msg
byte Type; // ISP_MSO
byte ReqI; // 0
byte Zero;

byte UCID; // connection's unique id (0 = host)
byte PLID; // player's unique id (if zero, use UCID)
byte UserType; // set if typed by a user (see User Values below)
byte TextStart; // first character of the actual text (after player name)

char Msg[128]; // 4, 8, 12... 128 characters - last byte is zero
};</pre></big>

== Packet Details ==

=== Size ===

The size of the packet varies from 12 to 136 bytes depending on the message contents.

=== Type ===

The packet type from the [[InSim_enumerations#ISP|ISP_]] enumeration, always ISP_MSO.

=== ReqI ===

ReqI is always equal to zero.

=== UCID ===

The unique ID of the connection that sent the message. A value of 0 represents the host (in multiplayer) or the local client (in single player).
Only used if PLID is 0.

=== PLID ===

The player ID of the player who sent the message. If 0, [[#UCID]] is used instead.

=== UserType ===

One of the MSO_ enumeration values:
* MSO_SYSTEM (0): System message
* MSO_USER (1): Normal visible user message
* MSO_PREFIX (2): Hidden message starting with the InSim prefix (see [[IS_ISI]])
* MSO_O (3): Hidden message typed on local PC with <code>/o</code> command

=== TextStart ===

The position of the first character of the actual message (skips the sender's name if [[#UserType]] is MSO_USER).

=== Msg ===

The bytes representing the message (for MSO_USER, this includes the sender's name, you can use [[#TextStart]] to skip it).

The message can be 4, 8, ..., up to 128 bytes, padded with zeros. The last byte is always zero.

[[Category:InSim packets]]

@@ Line 3: / Line 3: @@
 | sizetext      = 12, 16, 20... 136 depending on {{code|Msg}}
 | type_key      = ISP_MSO
-| type_value    = 10
+| type_value    = 11
 | direction     = in
 | category      = Text messages and key presses
-| prev          = [[IS_SCH]]
+| prev          = [[IS_ISM]]
 | next          = [[IS_III]]
 }}

←Older revision		Revision as of 21:33, 13 February 2026
Line 96:		Line 96:

	{{InSim packets}}		{{InSim packets}}
−

	[[Category:InSim packets]]		[[Category:InSim packets]]

@@ Line 1: / Line 1: @@
-== Introduction ==
+{{Infobox InSim packet
-The '''MS'''g '''O'''ut packet is a variable-size packet containing text messages sent by LFS. Messages that appear in-game are sent to external programs. Hidden messages typed with <code>/o message</code> are also reported.
+The '''MS'''g '''O'''ut packet is a variable-size packet containing text messages sent by LFS. Messages that appear in-game are sent to external programs. Hidden messages typed with {{kbd|/o message}} are also reported.
 {| class="wikitable"
@@ Line 10: / Line 21: @@
 | byte
 | Size
-| 12, 16, 20... 136 depending on Msg
+| 12, 16, 20... 136 depending on {{code|Msg}}
 |-
 | byte
@@ Line 44: / Line 55: @@
 | 4, 8, 12... 128 characters - last byte is zero
 |}
 === Size ===
@@ Line 85: / Line 94: @@
 The message can be 4, 8, ..., up to 128 bytes, padded with zeros. The last byte is always zero.
 [[Category:InSim packets]]

@@ Line 4: / Line 4: @@
 {| class="wikitable"
-|+ IS_III packet properties
+|+ IS_MSO packet properties
 |-
 ! Type !! Name !! Description

@@ Line 3: / Line 3: @@
 The '''MS'''g '''O'''ut packet is a variable-size packet containing text messages sent by LFS. Messages that appear in-game are sent to external programs. Hidden messages typed with <code>/o message</code> are also reported.
-<big><pre style="tab-size:4">struct IS_MSO // MSg Out - system messages and user messages - variable size
+{| class="wikitable"
+|+ IS_III packet properties
-	byte	Size;		// 12, 16, 20... 136 depending on Msg
+|-
-	byte	Type;		// ISP_MSO
+! Type !! Name !! Description
-	byte	ReqI;		// 0
+|-
-	byte	Zero;
+| byte
+| Size
-	byte	UCID;		// connection's unique id (0 = host)
+| 12, 16, 20... 136 depending on Msg
-	byte	PLID;		// player's unique id (if zero, use UCID)
+|-
-	byte	UserType;	// set if typed by a user (see User Values below)
+| byte
-	byte	TextStart;	// first character of the actual text (after player name)
+| Type
+| ISP_MSO
-	char	Msg[128];	// 4, 8, 12... 128 characters - last byte is zero
+|-
-};</pre></big>
+| byte
 == Packet Details ==
@@ Line 35: / Line 62: @@
 The unique ID of the connection that sent the message. A value of 0 represents the host (in multiplayer) or the local client (in single player).
-Only used if PLID is 0.
+Only used if [[#PLID|PLID]] is 0.
 === PLID ===

@@ Line 39: / Line 39: @@
 === PLID ===
-The player ID of the player who sent the message. If 0, [[#UCID]] is used instead.
+The player ID of the player who sent the message. If 0, [[#UCID|UCID]] is used instead.
 === UserType ===
@@ Line 51: / Line 51: @@
 === TextStart ===
-The position of the first character of the actual message (skips the sender's name if [[#UserType]] is MSO_USER).
+The position of the first character of the actual message (skips the sender's name if [[#UserType|UserType]] is MSO_USER).
 === Msg ===
-The bytes representing the message (for MSO_USER, this includes the sender's name, you can use [[#TextStart]] to skip it).
+The bytes representing the message (for MSO_USER, this includes the sender's name, you can use [[#TextStart|TextStart]] to skip it).
 The message can be 4, 8, ..., up to 128 bytes, padded with zeros. The last byte is always zero.
 [[Category:InSim packets]]