diff --git a/rtmp/chunk_wrap.go b/rtmp/chunk_wrap.go
index 927adda..f801ca7 100644
--- a/rtmp/chunk_wrap.go
+++ b/rtmp/chunk_wrap.go
@@ -4,6 +4,7 @@ import (
 	"net"
 	"encoding/binary"
 	"stream_server/rtmp/amf"
+	"fmt"
 )
 
 type ChunkWrapper struct {
@@ -48,6 +49,20 @@ func (chnk_wrp_ptr *ChunkWrapper) ReadChunk() (*Message, error) {
 	return full_msg_ptr, nil
 }
 
+func (chnk_wrp_ptr *ChunkWrapper) WriteChunk(csid uint32, msg_strmid uint32, msg_ptr *Message) (error) {
+	err := WriteChunk(
+		chnk_wrp_ptr.conn,
+		csid,
+		msg_strmid,
+		msg_ptr,
+		chnk_wrp_ptr.params.chunk_size,
+	)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
 func (chnk_wrp_ptr *ChunkWrapper) ReadPeerChunkSize() (error) {
 	set_chunk_size_msg, err := chnk_wrp_ptr.ReadChunk()
 	if err != nil || set_chunk_size_msg.msg_type != 1 || set_chunk_size_msg.msg_len != 4 {
@@ -71,5 +86,16 @@ func (chnk_wrp_ptr *ChunkWrapper) ReadConnectCommand() (error) {
 		return err
 	}
 	return err
-
+}
+
+func (chnk_wrp_ptr *ChunkWrapper) WriteWindowAckSize() (error) {
+	msg_ptr := new(Message)
+	msg_ptr.msg_type = 5
+	msg_ptr.data = make([]byte, 4)
+	msg_ptr.msg_len = 4
+	binary.BigEndian.PutUint32(msg_ptr.data, 5000000)
+	if err := chnk_wrp_ptr.WriteChunk(2, 0, msg_ptr); err != nil {
+		return err
+	}
+	return nil
 }
diff --git a/rtmp/connect.go b/rtmp/connect.go
index 6eb006a..452f178 100644
--- a/rtmp/connect.go
+++ b/rtmp/connect.go
@@ -11,6 +11,9 @@ func NegotiateConnect(chnk_wrp_ptr *ChunkWrapper) (bool) {
 	if err := chnk_wrp_ptr.ReadConnectCommand(); err != nil {
 		return false
 	}
+	if err := chnk_wrp_ptr.WriteWindowAckSize(); err != nil {
+		return false
+	}
 	fmt.Println(chnk_wrp_ptr.params)
 	return false
 }