View Source ExTDLib.Method.GetChatHistory (ExTDLib v0.0.4)

Returns messages in a chat. The messages are returned in a reverse chronological order (i.e., in order of decreasing message_id). For optimal performance, the number of returned messages is chosen by TDLib. This is an offline request if only_local is true. Returns object_ptr<Messages>.

NameTypeDescription
chat_idstringChat identifier.
from_message_idstringIdentifier of the message starting from which history must be fetched; use 0 to get results from the last message.
offsetnumberSpecify 0 to get results from exactly the from_message_id or a negative offset up to 99 to get additionally some newer messages.
limitnumberThe maximum number of messages to be returned; must be positive and can't be greater than 100. If the offset is negative, the limit must be greater than or equal to -offset. For optimal performance, the number of returned messages is chosen by TDLib and can be smaller than the specified limit.
only_localboolPass true to get only messages that are available without sending network requests.

More details on telegram's documentation.