UDP send problem on BlackBerry

Question

I am writing network application for Blackberry .This code is correct at simulator but not working at device. When i run my application on simulator, my server recieves the msg but when i run it on handheld, i get Exception (not IOException) that "null".

try { byte[] b = msg.getBytes(); dc = (UDPDatagramConnection)Connector.open("datagram://"+getHIP()+":" + getHPort()); Datagram dobject = dc.newDatagram(b, b.length); dc.send(dobject); System.out.println("Addr:" + dobject.getAddress()); System.out.println("Well Done!"); }

catch (IOException e) { System.out.println(e.getMessage()); } catch (Exception e)

{ System.out.println(e.getMessage()); }

finally { if (dc != null)

{

try { dc.close(); }

catch (Exception f) { System.out.println("Failed to close Connector: " + f); } }

}

Answer 1

I can think of two possibilities:

1. UDP is optional in the J2ME spec - so maybe the Blackberry doesn't support it.
2. The network the device is on might not support it, and the device can detect this, and reports it with an exception.

Answer 2

Network access on the BlackBerry is far from seemless from a developer's point of view. You either have to specify how the connection should be made in the URL, or the device has to have the correct APN settings in Options > Advanced Options > TCP Settings. You could try finding those and entering them to see if it works.

Answer 3

UDP requires the APN to be set in the Connector.open():

(DatagramConnection) Connector.open("udp://<host>:<dest_port>[;<src_port>]/<apn>[|<type>][;tunnelauthusername=<apn username>;tunnelauthpassword=<apn password>]");

For more info on that check out the Connector

It works fine on the simulator w/o APN because the simulator doesn't have an APN, but you need on a real device.

Answer 4

Hi,

I am trying to send data using UDP (datagram). I am not able to test application on simulator. I tried running MDS first and then simulator,but it did not work. The error is displayed as Port 8080 already in use on BlackBerry simulator console. How do I change port in simulator? The UDP port to which I am connecting is localhost:5014

I am new to BlackBerry networking. Please help me.

Thanks.