GRGSM_LIVEMON Output shows all 0000000000000000

[Bernard Nicoll]

Hello, I am a first time user of GR-GSM.

My issue appears to be no samples being collected.

When I run RTL_TEST 'NO Samples are lost' and the GSM850 Frequency has a strong signal in my area.

But when I invoke LIVEMON only zero's show up.

Running GRGSM onUbunTu 22.04.0 through Oracle VM Virtual box.

Any help would be appreciated.

Novice here! Thank you.

 

[Vasil Velichkov]

Hi Bernard,

Welcome to gr-gsm mailing list!

On 11/10/2023 18.11, Bernard Nicoll wrote:
> Hello, I am a first time user of GR-GSM.
>
> My issue appears to be no samples being collected.
> When I run RTL_TEST 'NO Samples are lost'

Note that rtl_test does not perform any signal processing and does not require CPU resources.

> and the GSM850 Frequency has a
> strong signal in my area.

How do you know that? Also make sure that there are sill 2G network in the GSM850 band in the country where you live in.

> But when I invoke LIVEMON only zero's show up.

These are not zeros but capital letter O and indicates Overflows which means that your VM is too slow and can't process all the data fast enough.

https://github.com/osmocom/gr-osmosdr/commit/e3c60c4a70352bac1b0f4b8d92e4f0cc306f1122

> Running GRGSM onUbunTu 22.04.0 through Oracle VM Virtual box.

> Any help would be appreciated.

Try adding more CPU cores to your VM or event better run it on bare metal (not in a VM).

Regards,
Vasil