Send and receive messages

Requires Message Persistence

To store data about messages, you must enable Message Persistence for your app's keyset in the Admin Portal and set the desired message retention period.

Send

Send a message to a previously defined channel using the sendText() method.

sendText() prepares the final message content for publishing, including text, any attached files, metadata, mentioned users, or referenced channels.

Method signature

This method takes the following parameters:

channel.sendText(
    text: String,
    meta: Map<String, Any>?,
    shouldStore: Boolean?,
    usePost: Boolean?,
    ttl: Int?,
    mentionedUsers: MessageMentionedUsers?,
    referencedChannels: Map<Int, MessageReferencedChannel>?,
    textLinks: List<TextLink>?,
    quotedMessage: Message?,
    files: List<InputFile>?
): PNFuture<PNPublishResult>

Input

Parameter	Type	Required	Default	Description
text	String	Yes	n/a	Text that you want to send to the selected channel.
meta	Map<String, Any>	No	n/a	Publish additional details with the request.
shouldStore	Boolean	No	true	If true, the messages are stored in Message Persistence.
usePost	Boolean	No	false	When true, the SDK uses HTTP POST to publish the messages. The message is sent in the BODY of the request instead of the query string when HTTP GET is used. The messages are also compressed to reduce their size.
ttl	Int	No	n/a	Defines if / how long (in hours) the message should be stored in Message Persistence. If shouldStore = true, and ttl = 0, the message is stored with no expiry time. If shouldStore = true and ttl = X, the message is stored with an expiry time of X hours. If shouldStore = false, the ttl parameter is ignored. If ttl is not specified, then the expiration of the message defaults back to the expiry value for the keyset.
mentionedUsers	MessageMentionedUsers	No	n/a	Object mapping a mentioned user (with name and ID) with the number of mention (like @Mar) in the message (relative to other user mentions). For example, { 0: { id: 123, name: "Mark" }, 2: { id: 345, name: "Rob" } } means that Mark will be shown on the first mention (@) in the message and Rob on the third. Refer to User mentions for more details and example.
referencedChannels	Map<Int, MessageReferencedChannel>	No	n/a	Object mapping the referenced channel (with name and ID) with the place (Int) where this reference (like #Sup) was mentioned in the message (relative to other channel references). For example, { 0: { id: 123, name: "Support" }, 2: { id: 345, name: "Off-topic" } } means that Support will be shown on the first reference in the message and Off-topic on the third. Refer to Reference channels for more details and example.
textLinks	List<TextLink>	No	n/a	Returned list of text links that are shown as text in the message Each TextLink contains these fields: class TextLink(val startIndex: Int, val endIndex: Int, val link: String) where startIndex indicates the position in the whole message where the link should start and endIndex where it ends. Note that indexing starts with 0. Refer to Links for more details and example.
quotedMessage	Message	No	n/a	Object added to a message when you quote another message. This object stores the following info about the quoted message: timetoken for the time when the quoted message was published, text with the original message content, and userId as the identifier of the user who published the quoted message. Refer to Quotes for more details and example.
files	List<InputFile>	No	n/a	One or multiple files attached to the text message. Each InputFile contains a name, type, and source: class InputFile(val name: String, val type: String, val source: Uploadable). Refer to Files for more details and example.

Output

Type	Description
PNFuture<PNPublishResult>	Returned object with a value of any type.

Basic usage

Send the Hi Everyone! message to the support channel. Mark its high priority and state that it should be stored in Message Persistence for 15 hours.

chat.getChannel("support").async { result ->
    result.onSuccess { channel ->
        // handle success
        channel.sendText(
            text = "Hi Everyone!",
            meta = mapOf("messageImportance" to "high"),
            shouldStore = true,
            ttl = 15 // 15 hours
        ).async { sendResult ->
            sendResult.onSuccess { publishResult ->
                // handle success
                println("Message sent successfully: ${publishResult.timetoken}")
            }.onFailure { exception ->
                // handle failure
                println("Error sending message: ${exception.message}")

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Receive

To receive messages on a given channel, you must connect to the channel and start listening to message events.