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max82 10-23-2008 07:06 AM

Socket problems
Hi there,

in our application we open a SocketConnection to a server and transfer about 200kb between BB and server (in turns, not at once). Somewhen, the screen blanks, the red LED turns on and the device restarts.

This error only occurs on OS 4.5, not on 4.3 or 4.2.1. We tried several 4.5 versions ( and, by different providers) and this error is reproducable. When I figured out that the systems reboots exactly like the linger value was set (100 secs), I set it to 0. Nothing changed. But when I set RCVBUF and SNDBUF to Nokias defaults (4096 bytes instead of BB 65536 bytes), it sometimes, but not always, works. So it seems to be a networking issue. Everything works fine in the simulator. The devices we use are 8110, 8700g and 8800.

I tried to contact the RIM support but with no success as I cannot provide the source code because of many dependencies. But as far as I can see, we implemented it the way it is shown in the developer's guide.

I added "deviceside=true" (alternatively also with adding APN data) but it always says in the log APN: ''. Is this right?

A workaround would be fine as I don't want to say to our customers that they have to downgrade their device to a specific version.

Any ideas?

max82 10-24-2008 02:50 AM

Okay, we finally found a workaround for this. The thing is, we implemented our own RPC library and are sending single data chunks to the server before we receive the answer. BB OS 4.5 seems to have problems handling this.

So now, we serialize the data to a byte array and then send this to the OutputStream. This way it works!

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