When I sent a byte [], the client failed to receive it.

[grootfan-lb]

server: java netty-socketio.version:2.0.3
The client receives most of the data as null

Server

byte[] compressedData = Snappy.compress(JSONObject.toJSONString(str));
               if(Arrays.isNullOrEmpty(compressedData)) {
                   return;
               }
clientStore.getSocketIoServer().getRoomOperations(serverId).sendEvent(TopicEnum.PRICE_NEWS.getTopic(),compressedData);

There is no problem when sending other types.
Fixed byte[] will not work either.

                List<Map<String, Object>> list = new ArrayList<>();

                Map<String, Object> map1 = new HashMap<>();
                map1.put("name", "Alice");
                map1.put("age", 30);
                list.add(map1);

                byte[] byteArray = serialize(list);
                clientStore.getSocketIoServer().getRoomOperations(serverId).sendEvent(TopicEnum.PRICE_NEWS.getTopic(),byteArray);

ios, Android, java Errors reported when receiving

Error message
java: socket.io-client v2.1.0

Exception in thread "EventThread" java.lang.NullPointerException: Cannot invoke "org.json.JSONArray.length()" because "array" is null
	at io.socket.client.Socket.toArray(Socket.java:515)
	at io.socket.client.Socket.onevent(Socket.java:344)
	at io.socket.client.Socket.onpacket(Socket.java:314)
	at io.socket.client.Socket.access$100(Socket.java:19)
	at io.socket.client.Socket$2$2.call(Socket.java:92)
	at io.socket.emitter.Emitter.emit(Emitter.java:117)
	at io.socket.client.Manager.ondecoded(Manager.java:361)
	at io.socket.client.Manager.access$1200(Manager.java:22)
	at io.socket.client.Manager$5.call(Manager.java:355)
	at io.socket.parser.IOParser$Decoder.add(IOParser.java:117)
	at io.socket.client.Manager$2.call(Manager.java:333)
	at io.socket.emitter.Emitter.emit(Emitter.java:117)
	at io.socket.engineio.client.Socket.onPacket(Socket.java:556)
	at io.socket.engineio.client.Socket.access$1000(Socket.java:29)
	at io.socket.engineio.client.Socket$5.call(Socket.java:335)
	at io.socket.emitter.Emitter.emit(Emitter.java:117)
	at io.socket.engineio.client.Transport.onPacket(Transport.java:124)
	at io.socket.engineio.client.Transport.onData(Transport.java:120)
	at io.socket.engineio.client.transports.WebSocket.access$200(WebSocket.java:22)
	at io.socket.engineio.client.transports.WebSocket$1$3.run(WebSocket.java:84)
	at io.socket.thread.EventThread$2.run(EventThread.java:80)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:842)

ios, Android Received as null

And the received byte[] data will have an extra 4 at the front.

[darrachequesne]

Hi! Could you please open an issue in the following repository? Thanks!