update

pkg/app/broadcast.go

@@ -24,7 +24,6 @@ func Broadcast()  {
 			serial = pai.Serial
 		}
 	}
-	for {
 	//ip 会变化
 	ip,err := util.GetLocalIpByName("wlan0")
 	if err != nil || ip == nil {
@@ -45,18 +44,41 @@ func Broadcast()  {
 		IP:   net.IPv4(255, 255, 255, 255),
 		Port: 8804,
 	}
+	conn, err := net.DialUDP("udp", &laddr, &raddr)
+	if err != nil {
+		tlog.Error("broadcast","net error ",err)
+		panic(err)
+	}
+	for {
+		//ip 会变化
+		ip,err = util.GetLocalIpByName("wlan0")
+		if err != nil || ip == nil {
+			tlog.Error("broadcast",err)
+			ip,err = util.GetLocalIpByName("eth0")
+			if err != nil {
+				panic(err)
+			}
+		}
+
 		if runningAddr != nil && runningAddr.IP.String() != ip.IP.String() {
 			laddr = net.UDPAddr{
 				IP:   ip.IP,
 				Port: 8804,
 			}
+			// 这里设置接收者的IP地址为广播地址
+			raddr = net.UDPAddr{
+				IP:   net.IPv4(255, 255, 255, 255),
+				Port: 8804,
 			}
-		conn, err := net.DialUDP("udp", &laddr, &raddr)
+			conn.Close()
+			conn, err = net.DialUDP("udp", &laddr, &raddr)
 			if err != nil {
 				tlog.Error("broadcast","net error ",err)
 				panic(err)
 			}
 			runningAddr = ip
+		}
+
 
 		_, err = conn.Write([]byte(send))
 		if err != nil{