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Editorial Team
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Asked: 2026-06-05T20:19:47+00:00

I am currently developing a Blackberry 5.0 application which needs to be able to

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I am currently developing a Blackberry 5.0 application which needs to be able to intercept a SMS message. I am trying to send a SMS to the emulator. I’ve come accross the suggestion to run two separate instances of the emulator and to send a SMS from the one emulator instance to the other using the SMSDemo sample application on both emulators.

I run the two instances of the emulator from two separate working directories as follows:

"C:\java\blackberry\eclipse\plugins\net.rim.ejde.componentpack5.0.0_5.0.0.36\components\simulator\fledge.exe" /app="C:\java\blackberry\eclipse\plugins\net.rim.ejde.componentpack5.0.0_5.0.0.36\components\simulator\Jvm.dll" /sms-source-port=6000 /sms-destination-port=6001

"C:\java\blackberry\eclipse\plugins\net.rim.ejde.componentpack5.0.0_5.0.0.36\components\simulator\fledge.exe" /app="C:\java\blackberry\eclipse\plugins\net.rim.ejde.componentpack5.0.0_5.0.0.36\components\simulator\Jvm.dll" /sms-source-port=6001 /sms-destination-port=6000

Both instances start up but when I attempt to send a SMS it never arrives at the second emulator.

I’ve disabled the Windows firewall – no change.

When I netstat for UDP I can see both ports 6000 and 6001 listening.

Any advice would be appreciated.

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1 Answer

  1. Editorial Team

    I have finally found a solution for the problem. Here it is:

    Using Wireshark to sniff the UDP broadcast from the emulator I noticed that the destination address is incorrect – its “1.0.0.127”. This address is not routable so the datagram sent from the one emulator will never reach the other emulator.

    I might have missed it but I cannot see any command line argument to set when launching the emulator to specify the destination address.

    I changed my development laptop to use a hard-coded IP address instead of DHCP. I then added 1.0.0.127 as another IP address to my TCP/IP settings. The address is now routable.

    Restarted both emulators with no changes to the port settings (/sms-source-port and /sms-destination-port) and it worked fine. I did not need to use the SMSDemo application. I used the normal Blackberry messaging application.

    I hope this helps others experiencing this same problem.

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