Issues connecting to remote RFSPACE SDR-IP with GQRX

[Davide Ceccherini]

Hello there! I'm a new ham radio hobbist and an old and a bit experienced linux user.

I prefer Linux over Windows as u all can guess, and i find GQRX a brilliant piece of software.

Yet, when it comes to usability, i do find many issues that as per today, seems to be hard to jump over.

On windows platforms i have several software that can easy handle connections to airspy servers and rfspace public availables SDRs.

While i know that airspy server is on developing for gqrx (found some git forks in the wilderness) i struggled even with connecting to remote rfspaces device, as listed on

http://sdranywhere.com/cloud/sdrweb.py

i was only able to connect to 1 device from that list (on windows all of the opens one works) and it is a SDR-IP type

this is my log:

c3kkos@ham:~$ gqrx
gr-osmosdr v0.1.4-127-g4d83c606 (0.1.5git) gnuradio 3.7.13.4
built-in source types: file fcd rtl rtl_tcp rfspace airspy soapy redpitaya
Resampling audio 96000 -> 48000
BookmarksFile is /home/c3kkos/.config/gqrx/bookmarks.csv
gr-osmosdr v0.1.4-127-g4d83c606 (0.1.5git) gnuradio 3.7.13.4
built-in source types: file fcd rtl rtl_tcp rfspace airspy soapy redpitaya
Using RFSPACE
              U SN SDR-IQ UNKNOWN BOOT 42495 FW 100
Radio reported a sample rate of 114 Hz
Radio reported a sample rate of 85 Hz

gqrx seems to succesfully connect to that device but waterfall and spectrum are completely blank, everywhere, for every frequency selected

i manually downloaded and compiled all the software chain i needed to run gqrx, therefore including gnuradio, grosmosdr and so on.

i'm using a dell laptop running Ubuntu MATE 19.04

Help please! I really want to stick using gqrx on linux!!!

PS: let me know if i must paste over some other logs

gnuradio is 3.7

gr-osmosdr and others are all latest version as for june 2019 git master branches

[Davide Ceccherini]

gqrx connect parameters: (taken from default.conf)

[input]
device="sdr-ip=64.223.112.95:50102"
frequency=115200000
gains=@Variant(\0\0\0\b\0\0\0\x1\0\0\0\x6\0L\0N\0\x41\0\0\0\x2\0\0\x1\x46)
hwagc=true
ignore_limits=true
sample_rate=250000

[Davide Ceccherini]

this is what i get when i try to connect to remote cloud-iq on that list:

gqrx
gr-osmosdr v0.1.4-127-g4d83c606 (0.1.5git) gnuradio 3.7.13.4
built-in source types: file fcd rtl rtl_tcp rfspace airspy soapy redpitaya
Resampling audio 96000 -> 48000
BookmarksFile is /home/c3kkos/.config/gqrx/bookmarks.csv
gr-osmosdr v0.1.4-127-g4d83c606 (0.1.5git) gnuradio 3.7.13.4
built-in source types: file fcd rtl rtl_tcp rfspace airspy soapy redpitaya
Using

terminate called after throwing an instance of 'std::runtime_error'
  what():  set_sample_rate failed
Aborted (core dumped)

[Alexandru Csete]

Hello Davide,

The Cloud-SDR servers you are referring to are running in a "websdr"
mode where the server does all the signal processing and the client
only acts as a lightweight user interface. Gqrx does not support this
protocol! Gqrx only works with Cloud-IQ running in IQ mode on your
local network.

You can try the latest version of the official client for linux from
before the protocol got locked down:
https://sourceforge.net/projects/remotesdrclient/

or my unofficial fork which still seems to work:
https://github.com/csete/remotesdrclient-ns

Cheers
Alex

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[Davide Ceccherini]

My god i completely forgot about websdr protocol. Indeed, browsing their site, it is not very clear. They give you this list and it's a go-go data table. You finish to copy and paste brainlessly. 

Thank you. I hope this will be useful for others too. 

Just not to open another thread: what about airspy server support? Is on duty list or not? 

Thank you again. 

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[Alexandru Csete]

> Just not to open another thread: what about airspy server support? Is on duty list or not?

No time at the moment, sorry :(

Alex

[Davide Ceccherini]

OK nevermind! Hope to have it asap :)

A last question: how your fork differs from the original version?

[Davide Ceccherini]

I'm having some troubles compiling the remotesdrclient code with the new Qt version (5.x)

added #include <QIntValidator>

in /gui/ipeditwidget.h

in/gui/plotter.cpp

i made this at line 940:

//PATCH
        QPointF p;
        p.setX(5);
        p.setY(y);
        QStaticText message(QString::number(dB) + " dB");
        // painter.drawStaticText(5, y, QString::number(dB) + " dB");  ORIGINAL
        painter.drawStaticText(p, message);

maybe useful for someone...

after this 2 simple patches the program compiles flawlessly.

For those who guess:

to compile:

download from url

cd into the directory where the files are.

mkdir build

qmake ../RemoteSdrClient.pro

make

sudo make install

thanks!