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My first thought would be, does your token have the permission

Can you share some code pls @dry-farmer-50272 ?

import {AudioPresets, ConnectionQuality, DataPacket_Kind, Room, RoomEvent, Track, VideoPresets} from 'livekit-client';

const encoder = new TextEncoder()

const decoder = new TextDecoder()

class Client {

constructor() {

this.room = new Room({

videoCaptureDefaults: {

resolution: VideoPresets.h216.resolution

},

adaptiveStream: false,

publishDefaults: {

videoCodec: "h264",

red: false,

dtx: false,

simulcast: false,

}

});

this.room.on(RoomEvent.DataReceived, OnDataReceived)

}

async sendMessage(_data_, _participantSIDs_) {

const strData = JSON.stringify(_data_)

const encodedData = encoder.encode(strData)

await this.room.localParticipant.publishData(encodedData, DataPacket_Kind.RELIABLE)

}

async connect(_token_) {

`await this.room.connect(

<ws://localhost:7880>

, token, {`

autoSubscribe: true, maxRetries: 3, peerConnectionTimeout: 15_000, rtcConfig: {

bundlePolicy: "max-bundle", rtcpMuxPolicy: "require"

}

})

}

}

function OnDataReceived(_payload_, _participant_, _kind_) {

const strData = decoder.decode(_payload_)

console.log('data received', strData, _participant_, _kind_)

}

const client = new Client()

export {client}

Simply to validate, in your video grant, you do have

canPublishData: true

? Ref: https://docs.livekit.io/concepts/authentication/#video-grant

this is the code of server

Your

sendMessage

method seems correct. May I ask you if you are using the LK Cloud or your own LK Server?

its my own

Are you attempting to send a data message to the same participant? I don’t think that works. (Full disclosure: I’ve only taken a quick glance)

why should I do that ? 😁 I simply just want to send a json to server

Well, it looks like you’re sending data messages between participants (facilitated via server).

yeah some messages should be send to other users through livekit server and some messages should be send to Go sdk only

@dry-farmer-50272 You should be able to look up the examples provided here : https://github.com/livekit/client-sdk-js/tree/main/example

thanks

As a suggestion, I'd probably create an account on cloud, see if you are facing the same issue or not. This would validate if its something with the LK Server Setup or the code.

Sorry, I don't have enough context here. But if it works with JS example app that Pat pointed you to, but not your own. My guess is there are differences in how you are using the APIs? Are you expecting to deliver a message to the same instance of the client?

yeah , I passed empty string array (also tried undefined) as participant sids in order to send to all other participants but does not have any affect

@dry-farmer-50272 you need to have multiple participants in a room to be able to send messages back and forth. We use this feature extensively in example apps.