Re: Controlling GRC parameters with QT Creater

Good evening everybody!

Regarding this:

"...PS: I found that the "Message Pair to Var" block is not very flexible, since it only allows to set one specific variable...."

Actually a variable can also be a dictionary:  simply creates a dictionary in which tag/value pairs refer to other variables.

In a mine (never finished) project I'm using this to transfer several settings (TX_freq, RX_freq, various gains, PTT) between a remote RF head (Pluto+ and amplifiers) and a local CONTROL unit, over ZMQ sockets with very good results

I hope it can be helpful...

Vittorio, I3VFJ

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lunedì 27 gennaio 2025 09:16, Philipp Niedermayer <p.niedermayer@gsi.de> ha scritto:

Dear Muhammad,

you can use ZMQ blocks to send messages to your GR program. Either directly to the message port of USRP sink, or use a "Message Pair to Var" block to update a flowgraph variable. You can read more about these blocks here:

• https://wiki.gnuradio.org/index.php/Understanding_ZMQ_Blocks
• https://wiki.gnuradio.org/index.php/Message_Pair_to_Var
  

PS: I found that the "Message Pair to Var" block is not very flexible, since it only allows to set one specific variable. I am currently working on a similar block that allows me to change multiple variables based on the message car, so that I can control my flowgraph by sending (variable_name, value) message pairs. Once I got it to work, and if there is interest, I could open a PR.

Best
Philipp

Am 25.1.25 um 8:08 schrieb Muhammad Anas:

Dear GNU Radio Community,

I'm working on a project to control a USRP channel frequency from QT creater GUI application, is it possible to implement a communication between QT and GRC using xmlrpm or tcp block etc to control the GRC parameters in real-time on the same computer in window.

Kindly help me to achieve this communication.

Regards

Muhammad Anas