If you query for messages using sdk.services.appMessaging.getMessages(), they are automatically marked as delivered.

It is the application's responsibility to mark new messages received from the WebSocket. It is also the application's responsibility to mark the messages as read whenever this occurs.

This is optional functionality.

To send a message status update, you can use the MessageStatusBuilder interface. You must include the conversationId of the conversation that you you want to send the status update to.

ES6 implementation of marking a message as `delivered`

import { MessageStatusBuilder } from "@comapi/sdk-js-foundation";

// Note I am using the version that takes a single messageId in this sample
let status = new MessageStatusBuilder().deliveredStatusUpdate("C984814D-B714-4DC8-8DFF-33C29082ACEA");

// we can send multiple updates of different types with this method, hence the array ...
sdk.services.appMessaging.sendMessageStatusUpdates(conversationId, [status]);

Classical implementation of marking a message as `read`

// Note I am using the version that takes a list of messageId's in this sample
var status = new COMAPI.MessageStatusBuilder().readStatusUpdates(["C984814D-B714-4DC8-8DFF-33C29082ACEA", "88E43FA4-9705-44F5-8DE6-4B9DD5E46DF3"]);

sdk.services.appMessaging.sendMessageStatusUpdates(conversationId, [status]);