Message queue in grc

GNU Radio
1

I have noticed that you can’t add a message queue to a GRC flowgraph.
Why is
that? Is the reason technical, or that no one bothered to write the .xml
file?

And is the message queue going to be deprecated in gnuradio 3.3?

Thank you

Dimitris S.
“If you think you’re too small to make a difference, try sleeping with a
mosquito!” - Amnesty International

2

In the current master, there is a message source and message sink block
in grc. And you can create custom blocks with ports of type “msg” and
connect them! However, blocks with both a msg input AND a msg output are
currently unsupported.

Also, It should be noted that this functionality will likely be removed
when we get PMTs up and running… and PMT based packet encoder/decoders
for mac layer and such/

-Josh

3

On Thu, Sep 10, 2009 at 12:13:21PM +0200, Dimitris S. wrote:

I have noticed that you can’t add a message queue to a GRC flowgraph. Why is
that? Is the reason technical, or that no one bothered to write the .xml
file?

And is the message queue going to be deprecated in gnuradio 3.3?

The functionality provided by the existing message queue will be
provided by a new mechanism.

Eric

4

Hi,
Is there a way to send & receive a character, let’s say for example ‘a’,
through USRPs? I have tried in vain with GRC as well with Python, but
nothing successfully. In GRC I couldn’t find a msg queue block. In the
python code, packing and unpacking don’t give satisfaction. I need some
suggestions!

Greatly appreciate your sharing.

Eva

5

That’s true, thank you Josh!

Dimitris S.
“If you think you’re too small to make a difference, try sleeping with
a mosquito!” - Amnesty International

6

I am just adding the flow-graph. As you can observe, msg queue blocs are
lacking. Also, please pay attention to the whole graph because my DSP
knowledge is still basic

Thank you for your suggestion!

Eva