Write & read socket on IOS 10.3.2

[shop.servic...@gmail.com]

If you are experiencing an issue please mention the full platform your issue applies to:
IDE: NetBeans/Eclipse/IDEA NetBeans 8.2
Desktop OS Windows 10
Simulator  3.7
Device IPhone 6 Plus IOS 10.3.2

Note: This works flawlessly on Android SCH-1545 OS Ver 5.0.1

Here is a code fragment 

import ca.weblite.codename1.net.Socket;

import java.io.InputStream;
import java.io.OutputStream;

mySocket = new Socket(host, port, socketTimeOut);

OutputStream os = mySocket.getOutputStream();

os.write(frame(CMD.getBytes()));

is = mySocket.getInputStream();

Note: Monitoring The Server, 

Command is received and properly responded.

On the IOS Client, have read zero bytes, subsequent (4) retries resulted in zero bytes available / read

On Android, response is received in 10ms

Note: WiFi is local and 659mbps 

Very responsive.

I have downloaded the CN1 lib @ http://www.codenameone.com/blog/sockets-multiline-trees.html

Add build hint ios.add_libs=CFNetwork.framework (if deploying to iOS)

Please see attached hints settings.

Thoughts?

[Shai Almog]

The build hint you added is:

ios.add libs=...

Instead of ios.add_libs with an underscore and no equals sign

[shop.servic...@gmail.com]

Thanks. (See new attached pic of hints)

Have corrected this and subsequent builds produce the following

Command received by Server, Server promptly responds

IOS client see's and reads only one byte and fails the call

Subsequent writes fail to read any data after successful writes

Note:

I close socket and streams after each command is written/read

[Shai Almog]

I don't know, I only use our builtin socket api and not the lib.
Maybe Steve knows.

Closing a socket after every message will make your connection very slow. You might as well use HTTPS which is generally better. I strongly recommend avoiding sockets.

[shop.servic...@gmail.com]

My app opens a socket, sets a timeout does some transaction, (typically request data from the server) closes the connection and processed the request

I don't see an exposed method to set timeout in the builtin socket api

The lib version (https://github.com/shannah/CN1Sockets) works very well for my needs.

Please advise

[Steve Hannah]

Can you share a little bit more of your client source code.  It's hard to comment without seeing more.

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Steve Hannah

Software Developer

Codename One

http://www.codenameone.com

[shop.servic...@gmail.com]

 

import ca.weblite.codename1.net.Socket;

import java.io.InputStream;
import java.io.OutputStream;

public static int socketReadRetries = 3;

public static int socketTimeOut = 3000;

public static Socket mySocket = null;

String CMD = "pingFromMobile~END~";

Object obj = null;

mySocket = new Socket(host, port, socketTimeOut);

OutputStream os = mySocket.getOutputStream();

os.write(frame(CMD.getBytes()));

          

for (int a = 0; a < socketReadRetries; a++) {

                is = mySocket.getInputStream();

                byte[] response = new byte[is.available()];

                if (response.length == 0) {

                    Thread.sleep(200);

                    continue;

                }

                try {

                    for (int b = 0; b < response.length; b++) {

                        response[b] = (byte) is.read();

                    }

                    obj = response;

                } catch (Exception h) {

                    h.printStackTrace();

                    if (mySocket != null) {

                        mySocket.close();

                    }

                    return null;

                }

                break;

            }

            if (is != null) {

                is.close();

            }

            if (mySocket != null && !mySocket.isClosed()) {

                mySocket.close();

[Steve Hannah]

You shouldn't do this:

byte[] response = new byte[is.available()];

From the javadocs for InputStream:

https://docs.oracle.com/javase/7/docs/api/java/io/InputStream.html#available()

Note that while some implementations of InputStream will return the total number of bytes in the stream, many will not. It is never correct to use the return value of this method to allocate a buffer intended to hold all data in this stream.

Steve

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Steve Hannah

Software Developer

Codename One

http://www.codenameone.com

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[shop.servic...@gmail.com]

Steve, Thanks I didn't know that, I modified the approach and it works correctly.

You have a great company and appreciate your support!

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Steve Hannah

Software Developer

Codename One

http://www.codenameone.com

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