PDA only receives UDP data when connected to PC; fails wirelessly

I have a UDP sender on PC, a receive program in PDA running Windows Mobile 5.0.
The wired thing is when I connect the PDA with PC through USB cable, receiver program in PDA works fine; but when disconnected, receiver program does not read UDP data any more. 

Here is the Sender program, everytime it runs, it broadcasts a 'T' or 'F' to all addresses. 
Here is the receiver program. It is constantly running reading the broadcast message. When PDA is connected to PC, it receives fine; when it disconnects, it does not receive any thing. 

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