diff --git a/src/rtmt/encode_decode_message.ts b/src/rtmt/encode_decode_message.ts
index 119c323..c895bd5 100644
--- a/src/rtmt/encode_decode_message.ts
+++ b/src/rtmt/encode_decode_message.ts
@@ -4,14 +4,15 @@ import { Bytes } from "./rtmt";
 const headerLenght = 4
 
 export type Message = {
-    channel : string,
-    data : Bytes,
+    channel: string,
+    data: Bytes,
 }
+ 
 //
 // channel is string, message is byte array
 //
-export function encode(message : Message) {
-    const {channel, data} = message
+export function encode(message: Message) {
+    const { channel, data } = message
     const channelLenght = channel.length
     const messageLenght = data.length
     const totalLenght = headerLenght + channelLenght + messageLenght
@@ -24,15 +25,15 @@ export function encode(message : Message) {
     const channelBytes = encodeText(channel)
 
     let count = headerLenght
-    channelBytes.forEach((byte : any)=>{
-         view.setUint8(count, byte)
+    channelBytes.forEach((byte: any) => {
+        view.setUint8(count, byte)
         count++
     })
 
-    for (const byte of data) {
+    data.forEach((byte: any) => {
         view.setUint8(count, byte)
         count++
-    }
+    })
 
     return buffer
 }
@@ -40,16 +41,12 @@ export function encode(message : Message) {
 // 
 // return { channel :  string, message :  byte array} 
 //
-export function decode(bytes : Bytes) : Message {
-    const view = new DataView(bytes.buffer);
-
-    const channelLenght = view.getUint32(0)
-
-
+export function decode(bytes: Bytes): Message {
+    const channelLenght = bytes.readInt32BE(0)
     const channel = decodeText(
         bytes.slice(headerLenght, headerLenght + channelLenght))
 
-    const message =  bytes.slice(headerLenght + channelLenght)
+    const message = bytes.slice(headerLenght + channelLenght)
 
     return {
         "channel": channel,
diff --git a/src/rtmt/rtmt.ts b/src/rtmt/rtmt.ts
index fa83f10..ed0eed0 100644
--- a/src/rtmt/rtmt.ts
+++ b/src/rtmt/rtmt.ts
@@ -1,4 +1,4 @@
-export type Bytes = UInt8Array
+export type Bytes = Buffer
 export type OnMessage = (clientID : string, message : Bytes) => any
 
 export interface RTMT{
diff --git a/src/rtmt/rtmt_websocket.ts b/src/rtmt/rtmt_websocket.ts
index 0e96386..6494d5a 100644
--- a/src/rtmt/rtmt_websocket.ts
+++ b/src/rtmt/rtmt_websocket.ts
@@ -17,19 +17,18 @@ export class RTMTWS implements RTMT {
         this.wsServer = null
     }
 
-    initWebSocket(server: http.Server, onopen: () => any) {
+    initWebSocket(server: http.Server, onopen: (userKey : string) => any) {
         const wsServer = new WebSocket.Server({ server })
+        this.wsServer = wsServer
         this.clients = new Map<string, WebSocket>()
 
         wsServer.on("connection", (ws: WebSocket, req: Request) => {
-            console.log(req.url);
             const regexResult = req.url.split(RegExp("\/\?userKey="));
             const clientID = regexResult[1]
-            console.log(regexResult);
             this.clients.set(clientID, ws)
             ws.on("message", (messageBytes: Bytes) => {
                 console.log('received: %s', messageBytes);
-                this.onWebSocketMessage("0", messageBytes)
+                this.onWebSocketMessage(clientID, messageBytes)
             })
 
             ws.on("close", (code: number, reason: string) => {
@@ -41,6 +40,8 @@ export class RTMTWS implements RTMT {
                 console.log("WS Closed with error! error : " + err.message);
                 this.clients.delete(clientID)
             })
+
+            onopen(clientID)
         })
 
     }
@@ -70,7 +71,7 @@ export class RTMTWS implements RTMT {
 
     }
 
-    onMessage(clientID: string, channel: string, message: Int8Array) {
+    onMessage(clientID: string, channel: string, message: Bytes) {
         const callback = this.messageChannels.get(channel)
         if (callback) {
             callback(clientID, message)