Fixed that maybe

src/main.go

@@ -5,8 +5,11 @@ import (
 	"context"
 	"fmt"
 	"log"
+	mrand "math/rand"
+	"time"
 
 	"github.com/libp2p/go-libp2p"
+	"github.com/libp2p/go-libp2p-core/crypto"
 	"github.com/libp2p/go-libp2p-core/host"
 	"github.com/libp2p/go-libp2p-core/network"
 	relayv1 "github.com/libp2p/go-libp2p/p2p/protocol/circuitv1/relay"
@@ -27,11 +30,22 @@ func run() {
 	// Create a libp2p host, able to be a relay
 	// Should connect other clients together
 
+	r := mrand.New(mrand.NewSource(time.Now().UnixMicro()))
+
+	// Generate a key pair for this host. We will use it at least
+	// to obtain a valid host ID.
+	priv, _, err := crypto.GenerateKeyPairWithReader(crypto.RSA, 2048, r)
+	if err != nil {
+		log.Printf("Error creating key pair: %v\n", err)
+		return
+	}
+
 	// Create a host h1 that is a relay
 	h1, err := libp2p.New(libp2p.DisableRelay(),
 		// Set transports
 		libp2p.Transport(tcp.NewTCPTransport),
 		libp2p.Transport(libp2pquic.NewTransport),
+		libp2p.Identity(priv),
 		// Set listenaddrs
 		libp2p.ListenAddrStrings(
 			"/ip4/0.0.0.0/tcp/6666",