Re: [Discuss-gnuradio] UDP port number

[Dev Ramudit]

Anyone feel free to correct me, but it seems like your problem isn't 
with the UDP port, but rather the internal "ports" that Gnuradio uses to 
connect blocks in a flowgraph. Looking at your traceback, your problem 
starts on line 32, where you're trying to connect a usrp.sink_c to a 
scopesink. I believe that sinks only have input ports and no output 
ports, so there's nothing available for gnuradio to connect from the 
usrp sink to the scopesink. The port error you're receiving is from the 
_check_port function in basic_flow_graph, which is trying to connect 
these two blocks.

To fix this, you need to send the output from "conv" to the sink and to 
the scope. I'm not quite sure what exactly you'd use to accomplish this, 
I imagine you need something with two output ports(?). Can someone else 
provide a suggestion?

Ziad ElMarakshy wrote:
> Ive been trying to run a code that reads a UDP connection and transmits the
> data using the USRP.
> I got some error
>
> Traceback (most recent call last):
>   File "./prefinal4.py", line 46, in ?
>     app = stdgui.stdapp (my_rx_graph, "My RX")
>   File "/usr/local/lib/python2.4/site-packages/gnuradio/wxgui/stdgui.py",
> line 36, in __init__
>     wx.App.__init__ (self, redirect=False)
>   File "/usr/lib/python2.4/site-packages/wx-2.6-gtk2-unicode/wx/_core.py",
> line 7700, in __init__
>     self._BootstrapApp()
>   File "/usr/lib/python2.4/site-packages/wx-2.6-gtk2-unicode/wx/_core.py",
> line 7352, in _BootstrapApp
>     return _core_.PyApp__BootstrapApp(*args, **kwargs)
>   File "/usr/local/lib/python2.4/site-packages/gnuradio/wxgui/stdgui.py",
> line 39, in OnInit
>     frame = stdframe (self.flow_graph_maker, self.title, self._nstatus)
>   File "/usr/local/lib/python2.4/site-packages/gnuradio/wxgui/stdgui.py",
> line 60, in __init__
>     self.panel = stdpanel (self, self, flow_graph_maker)
>   File "/usr/local/lib/python2.4/site-packages/gnuradio/wxgui/stdgui.py",
> line 81, in __init__
>     self.fg = flow_graph_maker (frame, self, vbox, sys.argv)
>   File "./prefinal4.py", line 32, in __init__
>     self.connect (dst,self.scope)
>   File
> "/usr/local/lib/python2.4/site-packages/gnuradio/gr/basic_flow_graph.py",
> line 115, in connect
>     self._connect (points[i-1], points[i])
>   File
> "/usr/local/lib/python2.4/site-packages/gnuradio/gr/basic_flow_graph.py",
> line 120, in _connect
>     self._connect_prim (s, d)
>   File
> "/usr/local/lib/python2.4/site-packages/gnuradio/gr/basic_flow_graph.py",
> line 125, in _connect_prim
>     self._check_valid_src_port (src_endpoint)
>   File
> "/usr/local/lib/python2.4/site-packages/gnuradio/gr/basic_flow_graph.py",
> line 222, in _check_valid_src_port
>     self._check_port (src_endpoint.block.output_signature(),
> src_endpoint.port)
>   File
> "/usr/local/lib/python2.4/site-packages/gnuradio/gr/basic_flow_graph.py",
> line 233, in _check_port
>     raise ValueError, 'port number out of range.'
> ValueError: port number out of range.
>
>
> i uploaded my code  http://www.nabble.com/file/p11395825/prefinal4.py
> prefinal4.py 
>