I've recently been using tunnel.py for 1/2 hr tests with no problems. I'm using the basic_tx/rx boards with a low frequency (5 MHz) and 1 Mbit datarate.
On Thu, Apr 21, 2011 at 10:31 AM, David Barton <david.barto...@yahoo.com>wrote: > I am working with two USRPS wired connection with 25 dB attenuator between > them so I didnt expect to much corruption of the packets. > > The error seems to occur quicker at lower bit rates for some reason , like > around after 10s of minutes for below 250 kbps and more like after an hour > or more for 1 Mbps. Unfortunatly this makes it unusable for longer > duration lower bandwidth tests until I find a way to fix the problem. > > Has anyone else had this problem with tunnel.py? > Thanks, > Dave > ------------------------------ > *From:* Tom Rondeau <trondeau1...@gmail.com> > *To:* David Barton <david.barto...@yahoo.com> > *Cc:* discuss-gnuradio@gnu.org > *Sent:* Thu, April 21, 2011 10:22:39 AM > *Subject:* Re: [Discuss-gnuradio] Tunnel.py exception > > On Wed, Apr 20, 2011 at 9:25 AM, David Barton <david.barto...@yahoo.com>wrote: > >> I am running tunnel.py on gnuradio 3.3.0 . It run successfully for a >> while but after a period of time (around an hour) the following exception >> prints out: >> >> Rx: ok = True len(payload) = 82 >> Tx: len(payload) = 82 >> Exception in thread Thread-1: >> Traceback (most recent call last): >> File "/usr/lib64/python2.6/threading.py", line 525, in __bootstrap_inner >> self.run() >> File >> "/usr/local/lib64/python2.6/site-packages/gnuradio/blks2impl/pkt.py", line >> 162, in run >> ok, payload = packet_utils.unmake_packet(msg.to_string(), >> int(msg.arg1())) >> File >> "/usr/local/lib64/python2.6/site-packages/gnuradio/packet_utils.py", line >> 183, in unmake_packet >> payload_with_crc = dewhiten(whitened_payload_with_crc, >> whitener_offset) >> File >> "/usr/local/lib64/python2.6/site-packages/gnuradio/packet_utils.py", line >> 95, in dewhiten >> return whiten(s, o) # self inverse >> File >> "/usr/local/lib64/python2.6/site-packages/gnuradio/packet_utils.py", line >> 91, in whiten >> z = sa ^ random_mask_vec8[o:len(sa)+o] >> ValueError: shape mismatch: objects cannot be broadcast to a single shape >> >> >> After this exception the receive chain seems to stop working. I am still >> able to transmit but no receive packets are recorded. >> >> Anyone have any clue what could be causing this issue? >> >> Thanks, >> Dave >> > > > I think that the problem is when the receiver thinks it has a zero-length > packet (that is, something gets screwed up with the header and it sees 0's > there). I'm not positive that this is the real problem, but I'd say it has > something to do with a packet getting corrupted in a particular way that's > causing this to happen. > > We would need to put some protections into the unmake_packet to handle this > as a dropped packet and then continue, once we find the exact problem. > > Tom > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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