Re: Using ZMQ source blocks with a separate process

[Barry Duggan]

I have a freshly built GR 3.8.1.0-rc1 and GRC 3.8.1.0 on rPi.

A simple flowgraph of ZMQ PULL Message Source feeding a Message Debug 
gives the following errors:

```
Executing: /usr/bin/python3 -u /home/pi/GRdev/msg_test.py

libEGL warning: DRI2: failed to authenticate
qt5ct: using qt5ct plugin
/home/pi/.gnuradio/prefs/vmcircbuf_default_factory: No such file or 
directory
vmcircbuf_createfilemapping: createfilemapping is not available
gr::vmcircbuf_sysv_shm: shmat (2): Invalid argument
gr::vmcircbuf_sysv_shm: shmat (2): Invalid argument
gr::vmcircbuf_sysv_shm: shmat (2): Invalid argument
```

/home/pi/.gnuradio/prefs/vmcircbuf_default_factory contains:
  gr::vmcircbuf_mmap_shm_open_factory

---
Barry Duggan KV4FV


On 2020-02-18 09:18, Michael Dickens wrote:
> GR's ZMQ should work across threads, processes, and networks; between 
> GR
> and non-GR so long as the packet formatting is correct. I've used ZMQ
> between GR within a network, never done this between GR and non-GR 
> though
> ... so maybe this is an aspiration rather than guarantee? - MLD
>
> On Mon, Feb 17, 2020 at 9:07 PM Barry Duggan <address@hidden> wrote:
>
> > Hi,
> >
> > I would like to use one of the ZMQ source blocks (such as ZMQ PULL
> > Message Source) to communicate with a separate Python process. I have
> > been able to use various Python examples to test between processes, 
> > but
> > when I try to use a GRC block, it fails. Are there restrictions which
> > prohibit data exchange outside the gnuradio realm?
> >
> > Thanks for your help.
> > --
> > Barry Duggan KV4FV
>
> --
> Michael Dickens
> Ettus Research Technical Support
> Email: address@hidden
> Web: https://ettus.com/