Why can't I send a groupmessage using this method?

[sFireFrog]

I use this method to send a message but it fails, how should I use it?

var  steamUnifiedMessages = steamClient.GetHandler<SteamUnifiedMessages>();
  CChatRoom_SendChatMessage_Request _Request = new CChatRoom_SendChatMessage_Request
                    {
                        chat_group_id = friend.SteamID,
                          chat_id = friend.SteamID.ToChatID(),
                        message = "test"
                    };

steamUnifiedMessages.SendMessage("ChatRoom.SendChatMessage#1", _Request);

[yaakov-h]

Good question, doesn't yet have an answer here. #561.

[sFireFrog]

Good question, doesn't yet have an answer here. #561.

@yaakov-h Ok，thank you for your reply, I have changed the way I can send it now(see below), but it doesn't match my usage scenario. This method is passive. I want to send the message actively but I can't get the two parameters groupid and chatid outside the notification callback.I still have a question. How can I trigger ChatRoomClient.NotifyIncomingChatMessage#1?

UnifiedClanChatRoomService = steamUnifiedMessages.CreateService<IChatRoom>();
                    var body = (CChatRoom_AckChatMessage_Notification)notification.Body;
                    CChatRoom_SendChatMessage_Request _Request = new CChatRoom_SendChatMessage_Request
                    {
                        chat_group_id = body.chat_group_id,
                        chat_id = body.chat_id,
                        message = "test"
                    };
                 UnifiedClanChatRoomService.SendMessage(x => x.SendChatMessage(_Request));

[yaakov-h]

Closing as duplicate.

We don't have any information about or implementation of the new chat system as of yet... I really should get on it, though.