# Listen to ports issue using GNU Radio

**URL:** <https://www.ruby-forum.com/t/listen-to-ports-issue-using-gnu-radio/240010>\
**Category:** GNU Radio\
**Created:** [March 24, 2014, 3:35pm UTC](https://www.ruby-forum.com/t/listen-to-ports-issue-using-gnu-radio/240010 "2014-03-24T15:35:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [March 24, 2014, 3:35pm UTC](https://www.ruby-forum.com/t/listen-to-ports-issue-using-gnu-radio/240010/1 "2014-03-24T15:35:39Z")

</div>

Hello GR,

I have an issue capturing a word that I broadcast from transceiver A to  
transceiver B.  
I use GR 3.65 with two usrp N210 on a Centos machine.

Whenever I run transceiverA and transceiverB scripts on the same machine  
it  
does not capture the word I am sending and I got no error displayed.

Here is the detail of the implementation:

TransceiverA script has inter alia:

- udp\_Server (socket\_pdu block) listening to 0.0.0.0 port 52001
- udp\_client (socket\_pdu block) listening to localhost port 3334
- socket listening on 127.0.0.1 52001 (from where I broadcast the word I  
transmit)

TransceiverB script has inter alia:

- udp\_Server (socket\_pdu block) listening to 0.0.0.0 port 52002
- udp\_client (socket\_pdu block) listening to localhost port 3333
- ncat -u -l -p 3333 ==\> here I got no word !

The point is that I tried running scripts on two different machines  
everything went good.  
Any help, hint or suggestion is appreciated.

Regards,  
Ruecan

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