ICE shenanigans

i have no idea if this will work

wish-server/.env

@@ -1,2 +1,4 @@
 HTTP_ADDRESS=127.0.0.1:3001
 DATABASE_URL=./streams.db
+UDP_MUX_PORT=3478
+TCP_MUX_ADDR=0.0.0.0:3478

wish-server/main.go

@@ -5,14 +5,17 @@ import (
 	"fmt"
 	"io"
 	"log"
+	"net"
 	"net/http"
 	"os"
+	"strconv"
 	"strings"
 	"sync"
 
 	"database/sql"
 
 	"github.com/joho/godotenv"
+	"github.com/pion/ice/v2"
 	"github.com/pion/interceptor"
 	"github.com/pion/webrtc/v3"
 
@@ -72,6 +75,7 @@ func setupWebRTC() *webrtc.API {
 	}
 
 	settingEngine := webrtc.SettingEngine{}
+	setupICE(&settingEngine)
 
 	return webrtc.NewAPI(
 		webrtc.WithMediaEngine(mediaEngine),
@@ -80,6 +84,40 @@ func setupWebRTC() *webrtc.API {
 	)
 }
 
+func setupICE(settingEngine *webrtc.SettingEngine) {
+	settingEngine.SetNetworkTypes([]webrtc.NetworkType{
+		webrtc.NetworkTypeUDP4, // webrtc.NetworkTypeUDP6,
+		webrtc.NetworkTypeTCP4, // webrtc.NetworkTypeTCP6,
+	})
+
+	if udpPort := os.Getenv("UDP_MUX_PORT"); udpPort != "" {
+		port, err := strconv.Atoi(udpPort)
+		if err != nil {
+			log.Fatal(err)
+		}
+		mux, err := ice.NewMultiUDPMuxFromPort(port)
+		if err != nil {
+			log.Fatal(err)
+		}
+		settingEngine.SetICEUDPMux(mux)
+	}
+
+	if tcpAddr := os.Getenv("TCP_MUX_ADDR"); tcpAddr != "" {
+		addr, err := net.ResolveTCPAddr("tcp", tcpAddr)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		listener, err := net.ListenTCP("tcp", addr)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		mux := webrtc.NewICETCPMux(nil, listener, 8)
+		settingEngine.SetICETCPMux(mux)
+	}
+}
+
 func withCors(next func(w http.ResponseWriter, r *http.Request)) http.HandlerFunc {
 	return func(res http.ResponseWriter, req *http.Request) {
 		res.Header().Set("Access-Control-Allow-Origin", "*")
@@ -149,7 +187,16 @@ func HandleWHIP(res http.ResponseWriter, req *http.Request) {
 		return
 	}
 
-	peerConnection, err := api.NewPeerConnection(webrtc.Configuration{})
+	peerConnection, err := api.NewPeerConnection(webrtc.Configuration{
+		ICEServers: []webrtc.ICEServer{
+			{
+				URLs: []string{"stun:stun.cloudflare.com:3478"},
+			},
+			{
+				URLs: []string{"stun:stun.l.google.com:19302"},
+			},
+		},
+	})
 	if err != nil {
 		logHTTPError(res, err.Error(), http.StatusInternalServerError)
 		return