I'd presume there's something going wrong in the communication between your PC and the dongle; maybe a USB packet goes missing, maybe the dongle reboots for some reason, like unstable power supply. It's probably wisest to fix that instead of building a watchdog around it.
If you really want to build a watchdog: Spawn a thread, e.g. by embedding a python module in the flow graph, that periodically checks whether the nitems_written(0) of your osmocom_source has increased since last call, and otherwise shuts down the flow graph. Cheers, Marcus On 07.11.20 13:40, Kopa Rebu wrote: > Hi all, > > I use GNU Radio with a rtl-sdr dongle, which I tune to some frequency > and then leave unattended for some hours. Sometimes, the reception just > stops: in my flowgraph, I have some display sinks showing the waveform, > and it remains still, like frozen. The GNU Radio interface is not > frozen, though: I can click on the buttons, only that they won't make > anything useful because the reception is not working anymore. > When this happens, I close the flowgraph and launch it again, without > having to unplug the dongle, and it starts working. > > As this can happen and go unnoticed for hours, I was thinking if there > would be a way to automatically detect this from somewhere, so the graph > can be restarted. Something like a watchdog. > > I use Linux. Any ideas? > > Thanks in advance
