Max recv buf size via SettingEngine

Relates to pion/sctp#218

sctptransport.go

@@ -103,8 +103,9 @@ func (r *SCTPTransport) Start(remoteCaps SCTPCapabilities) error {
 	}
 
 	sctpAssociation, err := sctp.Client(sctp.Config{
-		NetConn:       dtlsTransport.conn,
-		LoggerFactory: r.api.settingEngine.LoggerFactory,
+		NetConn:              dtlsTransport.conn,
+		MaxReceiveBufferSize: r.api.settingEngine.sctp.maxReceiveBufferSize,
+		LoggerFactory:        r.api.settingEngine.LoggerFactory,
 	})
 	if err != nil {
 		return err

settingengine.go

@@ -54,6 +54,9 @@ type SettingEngine struct {
 	dtls struct {
 		retransmissionInterval time.Duration
 	}
+	sctp struct {
+		maxReceiveBufferSize uint32
+	}
 	sdpMediaLevelFingerprints                 bool
 	answeringDTLSRole                         DTLSRole
 	disableCertificateFingerprintVerification bool
@@ -304,3 +307,9 @@ func (e *SettingEngine) SetReceiveMTU(receiveMTU uint) {
 func (e *SettingEngine) SetDTLSRetransmissionInterval(interval time.Duration) {
 	e.dtls.retransmissionInterval = interval
 }
+
+// SetSCTPMaxReceiveBufferSize sets the maximum receive buffer size.
+// Leave this 0 for the default maxReceiveBufferSize.
+func (e *SettingEngine) SetSCTPMaxReceiveBufferSize(maxReceiveBufferSize uint32) {
+	e.sctp.maxReceiveBufferSize = maxReceiveBufferSize
+}