Re: [Discuss-gnuradio] gr-ctrlport-monitor timeout exception

[Nowlan, Sean]

> 

>From: discuss-gnuradio-bounces+address@hidden [mailto:discuss-gnuradio-bounces+address@hidden On Behalf Of Nowlan, Sean
>Sent: Monday, November 11, 2013 4:10 PM
>To: address@hidden
>Subject: [Discuss-gnuradio] gr-ctrlport-monitor timeout exception

> 

>I’m using ControlPort to monitor transmissions through a USRP. I have a flowgraph responsible for generating burst traffic and streaming to a uhd_sink. Then I have a uhd_source tuned to the same frequency as the uhd_sink, and I connect it to a ctrlport_probe2_c block with length=128. I have ControlPort support compiled-in and enabled from a config file. I’m able to connect to a remotely running flowgraph using gr-ctrlport-monitor and plot the PSD of the “samples” vector pulled from the probe2 block every 100 milliseconds. The problem is that after (what seems to be) a nondeterministic time, the ICE port stops responding and gr-ctrlport-monitor reports an error:

> 

>ctrlport-monitor: radio.get threw exception (exception ::Ice::ConnectTimeoutException

>{

>}).

> 

>When I close and restart, gr-ctrlport-monitor times out and segfaults:

> 

>2013-11-11 16:02:47.329422 /usr/local/bin/gr-ctrlport-monitor: error: Traceback (most recent call last):

>  File "/usr/lib/pymodules/python2.7/Ice.py", line 984, in main

>    status = self.doMain(args, initData)

>  File "/usr/lib/pymodules/python2.7/Ice.py", line 1031, in doMain

>    return self.run(args)

>  File "/usr/local/lib/python2.7/dist-packages/gnuradio/ctrlport/IceRadioClient.py", line 97, in run

>    radio = self.getRadio(host, port)

>  File "/usr/local/lib/python2.7/dist-packages/gnuradio/ctrlport/IceRadioClient.py", line 36, in getRadio

>    radio = GNURadio.ControlPortPrx.checkedCast(base)

>  File "/usr/local/lib/python2.7/dist-packages/gnuradio_ice.py", line 1257, in checkedCast

>    return _M_gnuradio.ctrlport.GNURadio.ControlPortPrx.ice_checkedCast(proxy, '::GNURadio::ControlPort', facetOrCtx, _ctx)

>ConnectTimeoutException: exception ::Ice::ConnectTimeoutException

>{

>}

> 

>Segmentation fault (core dumped)

> 

>So there are two issues to note here:

>    -    Something in the ICE instance is breaking on the GNU Radio flowgraph side. The port is still open; it just times out. Trying to instantiate gr-ctrlport-monitor to an incorrect port just says “connection refused,” as expected.

>    -    gr-ctrlport-monitor is not robust to connection-related errors like timeouts or refused connections.

> 

>Is there any advice of what I can turn on or enable in GNU Radio or my flowgraph to debug the first problem? I can live with the second problem as long as I can make sure ICE doesn’t break on me.

> 

>Thanks,

>Sean

 

Sorry for getting antsy about this, but I’m really not sure how to go about debugging ICE server stuff. It seems like it’s buried pretty deeply in gnuradio-runtime. Where’s the best place to start looking to find out why the ICE server stops responding?

 

Sean