AlexxIT/go2rtc · error

failed to send codec request

Error message

failed to send codec request: %w

What it means

On WebRTC datachannel open, the JSON 'codec' request could not be sent to Tuya's datachannel (sendMessageToDataChannel failed), so the client is closed with this wrapped error — codec negotiation cannot begin. Wraps the send error.

Solutions

  1. Retry the connection; transient data channel setup races can cause this
  2. Verify WebRTC/DTLS connectivity to the Tuya cloud
Defensive patterns

Strategy: retry

When it happens

Trigger: Thrown at pkg/tuya/client.go:262 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of AlexxIT/go2rtc@c245815e75 (2026-09-07). Data as JSON: /api/errors/d595dafeac844781. Report an issue: GitHub.

Appendix: source

Thrown at pkg/tuya/client.go:262

			// fmt.Printf("tuya: datachannel error: %s\n", err.Error())
			client.Close(err)
		})

		client.dc.OnClose(func() {
			// fmt.Println("tuya: datachannel closed")
			client.Close(errors.New("datachannel: closed"))
		})

		client.dc.OnOpen(func() {
			// fmt.Println("tuya: datachannel opened")

			codecRequest, _ := json.Marshal(DataChannelMessage{
				Type: "codec",
				Msg:  "",
			})

			if err := client.sendMessageToDataChannel(codecRequest); err != nil {
				client.Close(fmt.Errorf("failed to send codec request: %w", err))
			}
		})
	}

	// Set up pc handler
	client.conn.Listen(func(msg any) {
		switch msg := msg.(type) {
		case *pion.ICECandidate:
			_ = sendOffer.Wait()
			if err := mqttClient.SendCandidate("a=" + msg.ToJSON().Candidate); err != nil {
				client.Close(err)
			}

		case pion.PeerConnectionState:
			switch msg {
			case pion.PeerConnectionStateNew:
				break
			case pion.PeerConnectionStateConnecting:

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