View Source ExTDLib.Object.UpdateChatAction (ExTDLib v0.0.4)

A message sender activity in the chat has changed.

NameTypeDescription
chat_idstringChat identifier.
message_thread_idstringIf not 0, a message thread identifier in which the action was performed.
sender_idMessageSenderIdentifier of a message sender performing the action.
actionChatActionThe action.

More details on telegram's documentation.