# WebSocket

Whenever ComapiClient is configured and authenticated, a new session is started which opens a WebSocket connection. This allows for two-way, real-time communication between the client and the server.

> Learn more about WebSockets on the [official RFC site](https://tools.ietf.org/html/rfc6455).

When open, the socket provides live updates for the profile and conversations which you are a participant of. You can subscribe for these updates to update your views and models.

***

# Add event listener

Register the delegate for the incoming events with the `CMPComapiClient` object. The delegate should conform to the `CMPEventListener` protocol.

```objectivec
[client addEventDelegate:self];

client.add(self)

To receive the event, implement following method from CMPEventListener protocol:

- (void)client:(CMPComapiClient *)client didReceiveEvent:(CMPEvent *)event {
    switch (event.type) {
        case CMPEventTypeConversationMessageSent:
            // message sent event received
            break;
        case CMPEventTypeConversationParticipantTypingOff:
            // participant typing off event received
            break;
        case CMPEventTypeConversationParticipantTyping:
            // participant typing event received
            break;
        case CMPEventTypeConversationMessageRead:
            // message read event received
            break;
        // case .other events:
        default:
            // unknown event type
            break;
    }
}

func client(_ client: ComapiClient, didReceive event: Event) {
    switch event.type {
        case .conversationMessageSent:
            // message sent event received
        case .conversationParticipantTypingOff:
            // participantTypingOff event received
        case .conversationParticipantTyping:
            // participantTyping event received
        case .conversationMessageRead:
            // message read event received
        // case .other events:

        default:
            // unknown event type
    }
}

You can register multiple listeners in your code, to handle events in different parts of your application. The events are broadcasted to all registered delegates.

[client removeEventDelegate:self];

client.remove(self)

Available events

Event type	Event subtype
profile	update	Sent when a user's profile is updated.
conversation	participantAdded	Sent when a participant is added to a conversation. When a conversation is created, this event also fires with the owner's `profileId`.
conversation	participantUpdated	Sent when a participant role is updated in a conversation.
conversation	participantRemoved	Sent when a participant is removed from a conversation.
conversation	delete	Sent when a conversation is deleted.
conversation	update	Sent when a conversation's details are updated.
conversation	undelete	Sent when a conversation is restored.
conversation	create	Sent when new conversation is created.
conversation	participantTyping	Sent when one of the participants is typing new message.
conversation	participantTypingOff	Sent when the participant stops typing.
conversationMessage	delivered	Sent when one of the participants updates the message status to delivered.
conversationMessage	read	Sent when one of the participants updates the message status to read.
conversationMessage	sent	Sent when a new message appears in a conversation. This event is also delivered to the message sender.

For all events you can access id, apiSpace, name and context properties.

For other events, there are other properties you can access:

profile.profileId

Conversation

Below are listed properties specific for the conversation event subtypes.

conversation.conversationId
conversation.payload.profileId
conversation.payload.role

conversation.conversationId
conversation.payload.profileId
conversation.payload.role

conversation.conversationId
conversation.payload.profileId
conversation.payload.role

conversation.conversationId
conversation.payload.date

conversation.profileId
conversation.payload.roles
conversation.payload.isPublic
conversation.payload.participants

conversation.conversationId
conversation.payload.description
conversation.payload.roles

conversation.profileId
conversation.payload.roles
conversation.payload.isPublic
conversation.payload.participants

conversation.account
conversation.payload.profileId
conversation.payload.conversationId

conversation.account
conversation.payload.profileId
conversation.payload.conversationId

ConversationMessage

conversationMessage.messageId
conversationMessage.conversationId
conversationMessage.profileId
conversationMessage.timestamp

conversationMessage.messageId
conversationMessage.conversationId
conversationMessage.profileId
conversationMessage.timestamp

conversationMessage.messageId
conversationMessage.metadata
conversationMessage.parts
conversationMessage.alert