Complete closure SocketConnections correctly

Hello

I'm having a problem with a persistent socket connection don't close does not correctly (at least I think that's the problem). Here is my scenario:

I have an iPad, which has an application that listens to incomming socket connections and responds to the need (I'm not in control of this application). Then I on the side of BB. The general idea is, I try to open a connection on WiFi, a specific IP address. If this succeeds, I opened an InputStream and an OutputStream. Some messages are sent back and forth between the two devices (starting with a reading on the River - from the perspective of BB), and then wait for us. The iPad or BB can then initiate communication more. When it does not, the two are pending. Water courses are never closed, unless the BB or iPad outputs, in which case both are closed, as well as the connection.

My problem is the following: if I close the BB app and off the device (i.e. ensuring that the app is completely closed and not only out of focus), then the next time I want to create a connection, it is just forever. Socket error (IOException), I get a general after about 30 years. I have to restart the iPad and try again to make it work again. So it seems that the BB is not completely close the connection, or the iPad is not clean properly. As I am not in control of the iPad code, I can't confirm. However, I think that it is on the side of BB as there is an iOS and Android version of my BB application, and they do not have this problem.

I also noticed that I get the message (s):

Background switch detected for APP_NAME (241) which has called id = 1mode FG = open - solomode DO NOT tunnel

Background switch detected for APP_NAME (241) which has 1 tunnel (s) open - defocus called

When I close the application on the BB.

I use the following code to close the water connections (and make sure that this is called when the application stops):

try {
                if (inStream != null) {
                    inStream.close();
                    inStream = null;
                }
            } catch (Exception e) {
                System.out.println("Error closing instream: " + e.getMessage());
            }
            try {
                if (outStream != null) {
                    outStream.close();
                    outStream = null;
                }
            } catch (Exception e) {
                System.out.println("Error closing outstream: " + e.getMessage());
            }
            try {
                if (connection != null) {
                    connection.close();
                    connection = null;
                }
            } catch (Exception e) {
                System.out.println("Error closing connection: " + e.getMessage());
            }

Another thing to note: I do things in the synchronized blocks, during the opening and closing of connections. I do also all the networks on a separate Thread. I make sure that all exceptions related to this to ensure that connections are closed. The connection, water courses and outstream instances are variable class.

In a main loop, in the non-Main-Event-Thread, I check if the connection is closed, in this case, I wait a few seconds (Thread.sleep), then try opening the connection again. So I'm constantly returning the IP address.

If I ever close the simulator/device and the connection seems to be able to connect/disconnect perfectly, with both applications open, then all closed and opened again, etc.

Is there something I should be aware of the wrt completely closing Sockets, clean it properly, using blocks in sync, etc. ?

I opened the connection as (all this surrounded by the try/catch/finally block and a synchronized block):

               connection = (SocketConnection) Connector.open("socket://" + url + ";interface=wifi", Connector.READ_WRITE, true);
                inStream = connection.openInputStream();
                outStream = connection.openOutputStream();

Thank you very much!

P.S. I've been Googling/search forums since last week, and did not close - I hope that I have not missed anything.

I think I might get a little. I can't believe that I don't check this before. I've installed wireshark to check what WAS going through, etc. I noticed that very little was coming or going to the iPad (even though he could browse the web, etc.). So I tried to make a simple ping of my machine. Nothing. WHAT? So I rebooted the iPad. It worked again... and then stopped? So I rebooted the router... He continued to work. And work... And work...

Without doubt, it stops again. But it seems that there may be nothing wrong with the iPad or BB at all. It could just be something questionable with my router! I have... Can't... Believe not!

I will continue to look into it and watch what is happening... but in the meantime, I'm terribly sorry for wasting your time! * so embarrassed *. Thanks for your help.

PS, I know this isn't the place for this, but if anyone has any ideas as to why this can happen, I would be very grateful to know. It cost me a few days of time wasted dev.

Tags: BlackBerry Developers

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