[**Red5 Pro WebRTC SDK v15.5.0**](../README.md) *** [Red5 Pro WebRTC SDK](../globals.md) / MessageChannel # Class: MessageChannel MessageChannel is a subclass of WHIPClient that provides a data channel for sending and receiving messages only. _There is no underlying media streaming logic in this client._ This ingest-based client is useful for sending and receiving messages to and from the server over a designated data channel. ## Extends - [`WHIPClient`](WHIPClient.md) ## Constructors ### Constructor > **new MessageChannel**(`url`, `additionalOptions?`): `MessageChannel` #### Parameters ##### url `undefined` | `string` ##### additionalOptions? [`RTCWhipPublisherConfigType`](../type-aliases/RTCWhipPublisherConfigType.md) #### Returns `MessageChannel` #### Overrides [`WHIPClient`](WHIPClient.md).[`constructor`](WHIPClient.md#constructor) ## Accessors ### options #### Get Signature > **get** **options**(): `undefined` \| [`RTCWhipPublisherConfigType`](../type-aliases/RTCWhipPublisherConfigType.md) Get the options for the WHIPClient. ##### Returns `undefined` \| [`RTCWhipPublisherConfigType`](../type-aliases/RTCWhipPublisherConfigType.md) #### Inherited from [`WHIPClient`](WHIPClient.md).[`options`](WHIPClient.md#options) ## Methods ### callServer() > **callServer**(`methodName`, `args`): `Promise`\<`any`\> Call a method on the server. #### Parameters ##### methodName `string` The name of the method to call. ##### args `any` The arguments to call the method with. #### Returns `Promise`\<`any`\> #### Inherited from [`WHIPClient`](WHIPClient.md).[`callServer`](WHIPClient.md#callserver) *** ### close() > **close**(): `Promise`\<`void`\> Close the MessageChannel. #### Returns `Promise`\<`void`\> *** ### emit() > **emit**(`type`, `data`): `void` Emit an event on the WHIPClient. #### Parameters ##### type `string` The type of event to emit. ##### data `any` The data to emit. #### Returns `void` #### Inherited from [`WHIPClient`](WHIPClient.md).[`emit`](WHIPClient.md#emit) *** ### getDataChannel() > **getDataChannel**(): `undefined` \| `RTCDataChannel` Get the DataChannel for the WHIPClient. #### Returns `undefined` \| `RTCDataChannel` #### Inherited from [`WHIPClient`](WHIPClient.md).[`getDataChannel`](WHIPClient.md#getdatachannel) *** ### getMediaStream() > **getMediaStream**(): `undefined` \| `MediaStream` Get the MediaStream generated for the WHIPClient. #### Returns `undefined` \| `MediaStream` #### Inherited from [`WHIPClient`](WHIPClient.md).[`getMediaStream`](WHIPClient.md#getmediastream) *** ### getMessageTransport() > **getMessageTransport**(): `undefined` \| `MessageTransport` Get the MessageTransport for the WHIPClient. #### Returns `undefined` \| `MessageTransport` #### Inherited from [`WHIPClient`](WHIPClient.md).[`getMessageTransport`](WHIPClient.md#getmessagetransport) *** ### getOptions() > **getOptions**(): `undefined` \| [`RTCWhipPublisherConfigType`](../type-aliases/RTCWhipPublisherConfigType.md) Get the options for the WHIPClient. #### Returns `undefined` \| [`RTCWhipPublisherConfigType`](../type-aliases/RTCWhipPublisherConfigType.md) #### Inherited from [`WHIPClient`](WHIPClient.md).[`getOptions`](WHIPClient.md#getoptions) *** ### getPeerConnection() > **getPeerConnection**(): `undefined` \| `RTCPeerConnection` Get the PeerConnection for the WHIPClient. #### Returns `undefined` \| `RTCPeerConnection` #### Inherited from [`WHIPClient`](WHIPClient.md).[`getPeerConnection`](WHIPClient.md#getpeerconnection) *** ### getPubNubClient() > **getPubNubClient**(): `undefined` \| [`PubNubClient`](PubNubClient.md) Get the PubNub client for the WHIPClient. #### Returns `undefined` \| [`PubNubClient`](PubNubClient.md) #### Inherited from [`WHIPClient`](WHIPClient.md).[`getPubNubClient`](WHIPClient.md#getpubnubclient) *** ### getType() > **getType**(): `string` Get the type of the MessageChannel. #### Returns `string` #### Overrides [`WHIPClient`](WHIPClient.md).[`getType`](WHIPClient.md#gettype) *** ### init() > **init**(`options`): `Promise`\<`MessageChannel`\> Initialize the MessageChannel. #### Parameters ##### options [`RTCWhipPublisherConfigType`](../type-aliases/RTCWhipPublisherConfigType.md) The options to initialize the MessageChannel with. See [RTCWhipPublisherConfigType](../type-aliases/RTCWhipPublisherConfigType.md) for more details. #### Returns `Promise`\<`MessageChannel`\> #### Overrides [`WHIPClient`](WHIPClient.md).[`init`](WHIPClient.md#init) *** ### initWithStream() > **initWithStream**(`options`, `stream`): `Promise`\<`MessageChannel`\> Initialize the WHIPClient with a MediaStream. Doing so will skip the SDK attempting to generate a MediaStream through browser-based media APIs. #### Parameters ##### options [`RTCWhipPublisherConfigType`](../type-aliases/RTCWhipPublisherConfigType.md) The options to use for initialization. ##### stream `MediaStream` The stream to use for initialization. #### Returns `Promise`\<`MessageChannel`\> #### Inherited from [`WHIPClient`](WHIPClient.md).[`initWithStream`](WHIPClient.md#initwithstream) *** ### monitorStats() > **monitorStats**(`stats?`): [`WHIPClient`](WHIPClient.md) Monitor the statistics of the MediaStream being published to the server over the underlying RTCPeerConnection.. #### Parameters ##### stats? [`StatsConfig`](../type-aliases/StatsConfig.md) The statistics configuration. #### Returns [`WHIPClient`](WHIPClient.md) #### Inherited from [`WHIPClient`](WHIPClient.md).[`monitorStats`](WHIPClient.md#monitorstats) *** ### muteAudio() > **muteAudio**(): `void` Mute the audio being published to the server. #### Returns `void` #### Inherited from [`WHIPClient`](WHIPClient.md).[`muteAudio`](WHIPClient.md#muteaudio) *** ### muteVideo() > **muteVideo**(): `void` Mute the video being published to the server. #### Returns `void` #### Inherited from [`WHIPClient`](WHIPClient.md).[`muteVideo`](WHIPClient.md#mutevideo) *** ### off() > **off**(`type`, `fn`): `void` Remove an event listener from the WHIPClient. #### Parameters ##### type `string` The type of event to remove the listener from. ##### fn (`event`) => `void` The function to remove the listener from. #### Returns `void` #### Inherited from [`WHIPClient`](WHIPClient.md).[`off`](WHIPClient.md#off) *** ### on() > **on**(`type`, `fn`): `void` Add an event listener to the WHIPClient. #### Parameters ##### type `string` The type of event to listen for. ##### fn (`event`) => `void` The function to call when the event is triggered. #### Returns `void` #### Inherited from [`WHIPClient`](WHIPClient.md).[`on`](WHIPClient.md#on) *** ### open() > **open**(`inactivePingIntervalMS`): `Promise`\<`MessageChannel`\> Open the MessageChannel. #### Parameters ##### inactivePingIntervalMS `number` = `10000` The interval in milliseconds to send an inactive ping. #### Returns `Promise`\<`MessageChannel`\> *** ### publish() > **publish**(): `Promise`\<`MessageChannel`\> Publish the MediaStream to the server. #### Returns `Promise`\<`MessageChannel`\> #### Overrides [`WHIPClient`](WHIPClient.md).[`publish`](WHIPClient.md#publish) *** ### send() > **send**(`methodName`, `data`): `Promise`\<`undefined` \| `boolean`\> Send a JSON message to the server over the data channel. - Overrides the send method in the WHIPClient class to properly wrap the data in a message object with methodName. #### Parameters ##### methodName `string` The name of the method to send. ##### data `any` The data to send. #### Returns `Promise`\<`undefined` \| `boolean`\> #### Overrides [`WHIPClient`](WHIPClient.md).[`send`](WHIPClient.md#send) *** ### sendData() > **sendData**(`data`): `Promise`\<`boolean`\> Send data to the server over the data channel. #### Parameters ##### data `any` The data to send. Can be of any type, such as an arraybuffer. #### Returns `Promise`\<`boolean`\> *** ### sendLog() > **sendLog**(`level`, `message`): `void` Send a log message to the server. #### Parameters ##### level `string` The level of the log message. ##### message `any` The message to send. #### Returns `void` #### Inherited from [`WHIPClient`](WHIPClient.md).[`sendLog`](WHIPClient.md#sendlog) *** ### sendMessage() > **sendMessage**(`message`): `Promise`\<`boolean`\> Send a message to the server over the data channel. This will attempt to wrap and send the message as a JSON payload. #### Parameters ##### message `any` The message to send. #### Returns `Promise`\<`boolean`\> #### See [sendData](#senddata) for sending raw data to the server over the data channel. *** ### sendPubNub() > **sendPubNub**(`channel`, `message`): `Promise`\<`boolean`\> Send a message to the PubNub channel. #### Parameters ##### channel `string` The channel to send the message to. ##### message `any` The message to send. #### Returns `Promise`\<`boolean`\> #### Inherited from [`WHIPClient`](WHIPClient.md).[`sendPubNub`](WHIPClient.md#sendpubnub) *** ### subscribePubNub() > **subscribePubNub**(`channel`, `options`): `Promise`\<`boolean`\> Subscribe to a PubNub channel. #### Parameters ##### channel `string` The channel to subscribe to. ##### options `any` The options to use for subscription. #### Returns `Promise`\<`boolean`\> #### Inherited from [`WHIPClient`](WHIPClient.md).[`subscribePubNub`](WHIPClient.md#subscribepubnub) *** ### trigger() > **trigger**(`event`): `void` Trigger an event on the MessageChannel. #### Parameters ##### event [`Event`](Event.md) The event to trigger. - Overrides the trigger method in the WHIPClient class to properly trigger the event on the MessageChannel. #### Returns `void` #### Overrides [`WHIPClient`](WHIPClient.md).[`trigger`](WHIPClient.md#trigger) *** ### unmonitorStats() > **unmonitorStats**(): [`WHIPClient`](WHIPClient.md) Unmonitor the statistics of the MediaStream being published to the server over the underlying RTCPeerConnection. #### Returns [`WHIPClient`](WHIPClient.md) #### Inherited from [`WHIPClient`](WHIPClient.md).[`unmonitorStats`](WHIPClient.md#unmonitorstats) *** ### unmuteAudio() > **unmuteAudio**(): `void` Unmute the audio being published to the server. #### Returns `void` #### Inherited from [`WHIPClient`](WHIPClient.md).[`unmuteAudio`](WHIPClient.md#unmuteaudio) *** ### unmuteVideo() > **unmuteVideo**(): `void` Unmute the video being published to the server. #### Returns `void` #### Inherited from [`WHIPClient`](WHIPClient.md).[`unmuteVideo`](WHIPClient.md#unmutevideo) *** ### unpublish() > **unpublish**(): `Promise`\<`void`\> Unpublish the MediaStream from the server. #### Returns `Promise`\<`void`\> #### Overrides [`WHIPClient`](WHIPClient.md).[`unpublish`](WHIPClient.md#unpublish) *** ### unsubscribePubNub() > **unsubscribePubNub**(`channel`): `Promise`\<`boolean`\> Unsubscribe from a PubNub channel. #### Parameters ##### channel `string` The channel to unsubscribe from. #### Returns `Promise`\<`boolean`\> #### Inherited from [`WHIPClient`](WHIPClient.md).[`unsubscribePubNub`](WHIPClient.md#unsubscribepubnub)