Problem of test Signal before using the TCP connection

Right now my application uses a SocketConnection TCP to communicate with a remote server.  It works fine, but I'm trying to make sure that my program can correctly handle the situation to move to an area with no coverage.

When I run my application, if I uncheck the box "on the cover" for GSM and CDMA under Network properties, my app fine until it calls the OutputStreamWriter.write () function to send something on the socket connection.  I have it in a try/catch block, but it just seems to hang instead of throwing an exception.

How can I check the signal before attempting to send data on the SocketConnection?

To facilitate clear life upwards, here's the order of what happens:

1 application starts on the cover.

2 SocketConnection made successfully.

3 OutputStreamWriter successfully SocketConnection.

4. coverage is lost

5 OutputStreamWriter.write () is called, but freezes instead of throwing an exception.

The socket connection output stream write operations do not throw an exception when there is no coverage is the correct behavior. That's because on cellular networks the IP tunnel to the carrier (and therefore the TCP connections on this tunnel) survives loss of coverage. For example, if your application opens a connection TCP from a BlackBerry, then the BlackBerry loses coverage, then take cover, say, 1 minute later, the TCP connection opened by your application will continue works fine, unless intermediate network component or your server closes the connection due to inactivity.

Tags: BlackBerry Developers

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