Pass Configured MTU into SCTP

Before pion/sctp would always do 1228

constants.go

@@ -38,7 +38,7 @@ const (
 
 	sdpAttributeSimulcast = "simulcast"
 
-	rtpOutboundMTU = 1200
+	outboundMTU = 1200
 
 	rtpPayloadTypeBitmask = 0x7F
 

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/pion/randutil v0.1.0
 	github.com/pion/rtcp v1.2.15
 	github.com/pion/rtp v1.8.13
-	github.com/pion/sctp v1.8.38
+	github.com/pion/sctp v1.8.39
 	github.com/pion/sdp/v3 v3.0.11
 	github.com/pion/srtp/v3 v3.0.4
 	github.com/pion/stun/v3 v3.0.0

go.sum

@@ -53,8 +53,8 @@ github.com/pion/rtcp v1.2.15 h1:LZQi2JbdipLOj4eBjK4wlVoQWfrZbh3Q6eHtWtJBZBo=
 github.com/pion/rtcp v1.2.15/go.mod h1:jlGuAjHMEXwMUHK78RgX0UmEJFV4zUKOFHR7OP+D3D0=
 github.com/pion/rtp v1.8.13 h1:8uSUPpjSL4OlwZI8Ygqu7+h2p9NPFB+yAZ461Xn5sNg=
 github.com/pion/rtp v1.8.13/go.mod h1:8uMBJj32Pa1wwx8Fuv/AsFhn8jsgw+3rUC2PfoBZ8p4=
-github.com/pion/sctp v1.8.38 h1:rntHxO7CyH8jeqC/bkuirl2uJ+BqTp2uxhisi5AYPRQ=
-github.com/pion/sctp v1.8.38/go.mod h1:cNiLdchXra8fHQwmIoqw0MbLLMs+f7uQ+dGMG2gWebE=
+github.com/pion/sctp v1.8.39 h1:PJma40vRHa3UTO3C4MyeJDQ+KIobVYRZQZ0Nt7SjQnE=
+github.com/pion/sctp v1.8.39/go.mod h1:cNiLdchXra8fHQwmIoqw0MbLLMs+f7uQ+dGMG2gWebE=
 github.com/pion/sdp/v3 v3.0.11 h1:VhgVSopdsBKwhCFoyyPmT1fKMeV9nLMrEKxNOdy3IVI=
 github.com/pion/sdp/v3 v3.0.11/go.mod h1:88GMahN5xnScv1hIMTqLdu/cOcUkj6a9ytbncwMCq2E=
 github.com/pion/srtp/v3 v3.0.4 h1:2Z6vDVxzrX3UHEgrUyIGM4rRouoC7v+NiF1IHtp9B5M=

sctptransport.go

@@ -120,6 +120,7 @@ func (r *SCTPTransport) Start(capabilities SCTPCapabilities) error {
 		RTOMax:               float64(r.api.settingEngine.sctp.rtoMax) / float64(time.Millisecond),
 		BlockWrite:           r.api.settingEngine.detach.DataChannels && r.api.settingEngine.dataChannelBlockWrite,
 		MaxMessageSize:       maxMessageSize,
+		MTU:                  outboundMTU,
 	})
 	if err != nil {
 		return err

track_local_static.go

@@ -283,7 +283,7 @@ func (s *TrackLocalStaticSample) Bind(t TrackLocalContext) (RTPCodecParameters,
 
 	s.sequencer = rtp.NewRandomSequencer()
 	s.packetizer = rtp.NewPacketizer(
-		rtpOutboundMTU,
+		outboundMTU,
 		0, // Value is handled when writing
 		0, // Value is handled when writing
 		payloader,