[connect] web-socket connection fixes

src/main/hw/connect/PacketUtil.hx

@@ -17,4 +17,13 @@ class PacketUtil {
         packet.writeTo(out);
         return out.getBytes();
     }
+
+    public static function toBytesWithSize<P:Message>(packet:P):Bytes {
+        var out = new BytesOutput();
+        out.writeUInt16(0);
+        packet.writeTo(out);
+        var bytes = out.getBytes();
+        bytes.setUInt16(0, bytes.length - 2);
+        return bytes;
+    }
 }