diff --git a/tap.go b/tap.go
index d7e67e8..61c84c8 100644
--- a/tap.go
+++ b/tap.go
@@ -12,7 +12,6 @@ import (
 	"github.com/songgao/packets/ethernet"
 	"github.com/songgao/water"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/credentials/insecure"
 )
 
@@ -40,10 +39,6 @@ func (cli *RPCClient) connect() {
 		return
 	}
 
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
-	defer cancel()
-
-	log.Println(conn.WaitForStateChange(ctx, connectivity.Idle))
 	cli.conn = conn
 	go cli.run()
 	time.Sleep(time.Millisecond)
@@ -59,6 +54,7 @@ func (cli *RPCClient) run() {
 	}()
 
 	c := gen.NewFrameServiceClient(cli.conn)
+
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
 	defer cancel()
 	stream, err := c.SendFrames(ctx)
@@ -144,7 +140,7 @@ func (nc *NetCard) runRead() {
 			framesBytes = append(framesBytes, []byte(rframe))
 		}
 
-		println(len(framesBytes))
+		log.Println(len(framesBytes))
 		if len(framesBytes) > 0 {
 			if nc.cli.conn == nil {
 				nc.cli.connect()