Using websockets through the simple websockets for webgl asset in unity3d, can connect but can't transmit messages - unity3d

Question

Just having a problem on my mac trying to send strings over web sockets using this https://www.assetstore.unity3d.com/en/#!/content/38367
Lots of adapted code below from here mainly http://www.codepool.biz/how-to-implement-a-java-websocket-server-for-image-transmission-with-jetty.html and the web socket sharp echotest example.
I can connect but there is no sign of strings in my Jetty server console window (on a ws server running in java(eclipse)).
I’m basically just trying to send a “1” to my server over a websocket connection with the unity editor (5) at the moment, to prompt the server to start sending PNG files encoded as byte arrays, so I can put them back together in a C# script and apply them to a texture.
this is the script, I want to attach it to a game object like a plane or a cube and display the updating images sent over the web socket from my Jetty server, but at the moment I'm just stuck trying to send a message and see it pop up in my eclipse console window.
using UnityEngine;
using System.Collections;
using System;
public class socketTexture : MonoBehaviour {
// Use this for initialization
IEnumerator Start () {
WebSocket w = new WebSocket(new Uri("ws://192.168.0.149:8080/"));
yield return StartCoroutine(w.Connect());
Debug.Log ("Connected");
w.SendString("I'm client");
w.SendString("1");
while (true)
{
byte[] reply = w.Recv();
if (reply != null)
{
Debug.Log ("Received: "+reply);
var tex = new Texture2D(300, 300, TextureFormat.PVRTC_RGBA4, false);
// Load data into the texture and upload it to the GPU.
tex.LoadRawTextureData(reply);
tex.Apply();
// Assign texture to renderer's material.
GetComponent<Renderer>().material.mainTexture = tex;
}
if (w.Error != null)
{
Debug.LogError ("Error: "+w.Error);
break;
}
yield return 0;
}
w.Close();
}
}
...And the relevant code from the jetty server, but this works, I've tested it with some javascript and I can load the PNGs back into the browser window, so I'm definitely doing something wrong in Unity
#OnWebSocketMessage //part request from websocket client (remote browser)
public void onMessage( String message) {
System.out.println("message");
if (message.equals("1") || message.equals("2") || message.equals("3") || message.equals("4") ) {
System.out.println("Part " + message + " joined");
System.out.println( UIMain.usersPath + "/" + message + ".png" );
final String testVar = ( UIMain.usersPath + "/" + message + ".png" );
task = new FileWatcher( new File(testVar) ) {
protected void onChange( File file ) {
// here we code the action on a change
System.out.println( "File "+ file.getName() +" has changed!" );
try {
File f = new File(testVar);
BufferedImage bi = ImageIO.read(f);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(bi, "png", out);
ByteBuffer byteBuffer = ByteBuffer.wrap(out.toByteArray());
mSession.getRemote().sendBytes(byteBuffer);
out.close();
byteBuffer.clear();
}
catch (IOException e) {
e.printStackTrace();
}
}
};
Timer timer1 = new Timer(); {
timer1.schedule(task , new Date(), 40 );
}
}
else if (message.equals( "0")) {
zerocounter = zerocounter + 1;
if (zerocounter >= 2) {
task.cancel();
}
}
else if (message.equals( "Hi there, client here")) {
System.out.println( "Client says: " + message );
}
}
Any help would be really appreciated, been lurking on here for years, hopefully getting to the stage soon where I can help out others a bit too.
Benedict
Edit:
This is my console error message in Unity
FormatException: Invalid length. System.Convert.FromBase64String
(System.String s) (at
/Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System/Convert.cs:146)
EchoTest+c__Iterator0.MoveNext () (at
Assets/Example/EchoTest.cs:11)
I'm pretty sure the problem arises from websocket sharp for webgl. I need to send the message as a byte array.

Answer 1

OK So Joakim Erdfelt was right, the server was not configured to handle Byte[] messages. Here's what I added to fix it:
#OnWebSocketMessage
public void onMessage(byte[] buffer, int offset, int length) throws UnsupportedEncodingException {
System.out.println(buffer);
String sFclientOutStr = new String(buffer, "UTF-8");
sFclientOut = Integer.parseInt(sFclientOutStr);
System.out.println(sFclientOut);
if ((sFclientOut > 0) & (sFclientOut < 500)) {
System.out.println("Part " + sFclientOut + " joined");
System.out.println( UIMain.usersPath + "/" + sFclientOutStr + ".png" );
final String testVar = ( UIMain.usersPath + "/" + sFclientOutStr + ".png" );
task = new FileWatcher( new File(testVar) ) {
protected void onChange( File file ) {
// here we code the action on a change
System.out.println( "File "+ file.getName() +" has changed!" );
try {
File f = new File(testVar);
BufferedImage bi = ImageIO.read(f);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(bi, "png", out);
ByteBuffer byteBuffer = ByteBuffer.wrap(out.toByteArray());
mSession.getRemote().sendBytes(byteBuffer);
out.close();
byteBuffer.clear();
}
catch (IOException e) {
e.printStackTrace();
}
}
};
Timer timer1 = new Timer(); {
timer1.schedule(task , new Date(), 40 );
}
}
else if (sFclientOutStr.equals("0")) {
zerocounter = zerocounter + 1;
if (zerocounter >= 2) {
task.cancel();
}
}
else if (sFclientOutStr.equals( "I'm client")) {
System.out.println( "Client says: " + sFclientOutStr );
}
}
These links helped explain it for me http://www.programcreek.com/java-api-examples/index.php?api=org.eclipse.jetty.websocket.api.annotations.OnWebSocketMessage
http://www.eclipse.org/jetty/documentation/current/jetty-websocket-api-annotations.html