Re: [Discuss-gnuradio] gmsk and sockets

[Bob Vincent]

Not being a python programmer, I made the mistake of
creating the socket inside the init block.
A seasoned python guy sweated for about 1/2 hour before pointing out that
the socket I created had gone out of scope by the time the connects
happened.
Maybe that's your problem.

At 05:16 PM 3/11/2005, James Cooley wrote:
> In using socket file
> descriptors, what is different about Bob's setup and mine? I'm trying to
> create a very basic example of writing a sin source over socket to
> display and end up getting "Bad file descriptor" errors and the
> thing connects and then dies with:
>
> Connection:  <socket._socketobject object at 0xb601861c>
> Address:  ('127.0.0.1', 32942)
> gr_file_descriptor_sink: Bad file descriptor
>
> The heart of the code is below, I specify -s to make it a server, else
> it's the client. I notice Bob is using bytes I'm using complex, could
> this be part of it? Is there a quick and dirty way to convert between the
> two (don't see a filter for this one)?
>
> -jamie
>
> ==================================================
>
>        parser = OptionParser
> (option_class=eng_option)
>        parser.add_option ("-s",
> "--server", action="">
>        parser.add_option ("-i",
> "--address",
> type="string",default="localhost")
>        parser.add_option ("-p",
> "--port", type="int",default=8881)
>       
>        (options, args) = parser.parse_args
> ()
>       
>        # Create socket
>        fd = socket.socket(socket.AF_INET,
> socket.SOCK_STREAM)
>        #sock.setblocking(0)
>
>        # set rate
>        rate = 8e6
>       
>        # Now we decide if we're client or
> server
>        if(options.server == True):
>            #
>            # server is
> sending data
>            #
>           
>            # Ensure you
> can restart server quickly when it terminates
>           
> fd.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
>           
>            # set the
> client sock's TCP num
>           
> fd.bind(('0.0.0.0',options.port))
>           
> fd.listen(2)
>            (conn,
> connaddr) = fd.accept()
>            print
> "Connection: ", conn
>            print
> "Address: ", connaddr
>
>            # setup
> socket file sink
>            filesink =
> gr.file_descriptor_sink(gr.sizeof_gr_complex, conn.fileno())
>
>            # setup
> signal source
>            ampl =
> 0.1
>            freq =
> 440
>            src =
> "" gr.GR_SIN_WAVE, freq, ampl)
>           
>            # connect it
> up
>           
> self.connect(src,filesink)
>
>        else:
>            #
>            # client is
> receiving data and displaying it
>            #
>           
>            # make
> socket
>           
> fd.connect((options.address,options.port))
>            print
> "Connection: ", fd
>
>            # setup file
> src
>            src =
> "" fd.fileno(),
> True)
>
>            # setup
> display
>            options.avg
> = 10
>            fftsink,
> fft_win = make_fft_sink_c (self, panel, "", 512,
> rate,True,False,options.avg,-1)
>           
>            # connect
> and add
>           
> self.connect(src,fftsink)
>
>            vbox.Add
> (fft_win, 1, wx.EXPAND)
>
>
>
>
>
>
>
>
>
>
>
>
> Eric Blossom wrote:
>
> > On Thu, Mar 10, 2005 at
> > 10:46:05AM -0500, Bob Vincent wrote:
> >  
> >
> > > I've modified fsk_*.py to allow
> > > connections via options: above from a socket, below to a named pipe.
> > > I've also incorporated gmsk code published here as a modulation
> > > option.
> > >
> > > Needs the gmsk.py that floated past. Thanks to Joshua Lackey. Joshua,
> > > here's your feedback: It works! ;)
> > >
> > > As expected, gmsk works better. Also is nicer to the interpolating filter
> > > on the USRP board.
> > > I've enclosed my files. If someone wants to improve and/or distribute
> > > them via the cvs tree, go right ahead.
> > >    
> >
> > Thanks!
> >
> > Eric
> >
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
> >