UDP do not work correctly

GNU Radio
1

Hi Gnuradio People, :slight_smile:

I tried to get the and to work.
But it didn’t work as it should. The FFT Plots only
shows a white screen. The CPU of my Work PC is under
100% and my Server PC too. Should this be a Problem of
?
I have a network traffic between the connected pc’s with
about 300Kbyte/s.

Do you have any hints for me?

Specification:
Work PC:

  • IP 194.94.26.158
  • Firewall with open UDP Port 13130:13133

Server PC:

  • IP 192.168.111.67
  • Firewall with open UDP Port 13130:13133

The Firewall was tested with <nmap -p 13130-13133 -sU IP-ADRESS>.

So i created a Flow Graph:
#######################################################
###SERVER PC###
[SIN Source]–\ /–>[USRP Sink]
±->+
[COS SOURCE]–/ -->[UDP Sink 1]

SETTINGS for UDP Sink 1:
Local IP Address: 192.168.111.67
Port: 13130
Remote IP Address: 194.94.26.158
Port: 13132

[USRP Source]–>[UDP SINK 2]

SETTINGS for UDP Sink 1:
Local IP Address: 192.168.111.67
Port: 13131
Remote IP Address: 194.94.26.158
Port: 13133

###WORK PC###
[UDP Source1]–>[FFT Plot TX]

SETTINGS for UDP Source1:
IP Address: 194.94.26.158
Port: 13132

[UDP Source2]–>[FFT Plot RX]

SETTINGS for UDP Source2:
IP Address: 194.94.26.158
Port: 13133
#######################################################

Regards Markus

2

Do you have any hints for me?

Unless I am misunderstanding your diagram, I think you need something
to slow down rate of the cosine source ([COS SOURCE]–/ -->[UDP
Sink 1]). If you connect it to a non-rate limited sink it will just
pump out samples as fast as it can, hence your 100% CPU usage.

Try a gr.throttle() in between.

Jason

3

Jason U. <jasonuher gmail.com> writes:

Do you have any hints for me?

Unless I am misunderstanding your diagram, I think you need something
to slow down rate of the cosine source ([COS SOURCE]–/ -->[UDP
Sink 1]). If you connect it to a non-rate limited sink it will just
pump out samples as fast as it can, hence your 100% CPU usage.

Try a gr.throttle() in between.
Ok i understand, but why do i need a <gr.throttle()> for the
FFT-Plot too ?
The do not have a variable , but the
has a variable .
Is this a Bug ?