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SendChatMessage(msg [, chatType, languageID, target]) does not permit all possible characters (or 'bytes', to be precise) without potentially throwing an error or disconnecting the player.

ID PrintoutChatFrame:AddMessage(strchar(ID)) Permitted Remarks
0 none (terminates string)
Silently ignored (ie, no message sent)
1 - 9
✔️
10 new line (line feed)
DISCONNECT
11 - 12
✔️
13 new line (carriage return)
✔️
14 - 31
✔️
32 - 123 standard ASCII
✔️
The client applies chat substitutions to %t, %f and other codes
124 |
ERROR "invalid escape code in chat message", also observed causing disconnects as of 3.1.3
125 - 126 standard ASCII
✔️
127
✔️
128 - 255
ERROR "chat message must be UTF-8 text" possible

See also

  • strchar(charID) constructs a single character from its decimal representation
  • strbyte(text[, index]) returns the decimal byte representation of a single character
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