server-sdk-go: first PublishData always results in an error

Hi!

Thx for your great work with livekit. It’s a really awesome framework and very easy to use!

However I’m getting an error when sending some data

room.Callback.OnParticipantConnected = func(p *lksdk.RemoteParticipant) {
  if err := room.LocalParticipant.PublishData([]byte("hello"), livekit.DataPacket_RELIABLE, []string{p.SID()}); err != nil {
    log.Printf("could not publish data to participant '%s', err: '%v'", p.SID(), err)
  }
}

After a few SECONDS this call results in the error

could not publish data to participant 'PA_kCS2E6r2YV3c', err: 'could not connect after timeout'

Immediately after that log entry, the following log entry occurs:

"level"=0 "msg"="successfully set publisher answer"

After that log entry I’m able to successfully send data messages. It seems to me that the first call to PublishData blocks some logic.

If I try to send with a go routine like this

	room.Callback.OnParticipantConnected = func(p *lksdk.RemoteParticipant) {
		log.Printf("OnParticipantConnected '%s'", p.Identity())
		go func() {
			time.Sleep(time.Second * 1)
			sendData(p)
			time.Sleep(time.Second * 1)
			sendData(p)
		}()
	}

the first send results in the error

could not publish data to participant 'PA_73nWKR3avB7X', err: 'io: read/write on closed pipe'

the second send succeeds.

In conclusion: the first PublishData always fails. Afterwards it works.

I’m not sure if it matters but the other participant is using the js-sdk

Any help would be greatly appreciated 😄