Re: [Discuss-gnuradio] Sending/Receiving UDP Data Over Internet

[Marcus Müller]

Hi Matias,
usually, binding ports over 9000 should be possible for normal users,
but if you already made sure that your address is correct and there is
nothing else occupying port 9000, I'd check with the Ubuntu folks if
there is something like seLinux blocking such things.

As a side note, never ever add a throttle block to a flowgraph which has
a sample rate determined by a hardware device. There's only two things
that can happen:
1. Either your hardware rate matches the throttle block exactly or is
lower: The throttle block, aside from adding unwanted latency, doesn't
have any effect
2. Your hardware rate is higher than your throttle rate: a backlog of
samples will build up, up to the point where something (in your case,
the UDP stack) will have to drop data.

Greetings,
Marcus

On 23.06.2014 17:24, Matias wrote:
> Hello,
>
> We would like to send UDP data from a USRP over the internet to a remote
> computer. The setup on the host side is:
>
> USRP Source --> UDP Sink
>
> And on the client side:
>
> UDP Source --> Throttle --> WX GUI FFT Sink
>
> This setup has worked on a local network using the client's IP address
> "10.10.0.175:9000" with the UDP sink and UDP source. However, when using the
> host's public static IP "166.149.xxx.xxx:9000", Gnuradio throws the
> following error:
>
>
> /Traceback (most recent call last):
>   File "/home/matias/Documents/top_block.py", line 116, in <module>
>     tb = top_block()
>   File "/home/matias/Documents/top_block.py", line 76, in __init__
>     self.blocks_udp_source_0 = blocks.udp_source(gr.sizeof_gr_complex*1,
> "166.149.xxx.xxx", 9000, 1472, True)
>   File
> "/opt/gnuradio-3.7.3/lib/python2.7/dist-packages/gnuradio/blocks/blocks_swig5.py",
> line 1974, in make
>     return _blocks_swig5.udp_source_make(*args, **kwargs)
> RuntimeError: bind: Cannot assign requested address/
>
> Does anyone know how to resolve this? We are using GNU Radio 3.7.3 on a
> virtual Ubuntu 12.04 LTS.
>
> Thanks,
> Matias Ponce
>
> CellAntenna Engineer
>
> CellAntenna Corporation
>
> 12453 NW 44th Street
> Coral Springs, FL 33065
>
>
> Office: 954-340-7053 ext 10251
> E-mail: address@hidden
> Web: http://www.cellantenna.com
>
>
>
>
>
>
>
> --
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