heliosh

I could, but the difficult part is not the script, but getting known to rrdtool. It's pointless if you don't understand how rrdtool works. Once you understand how rrdtool works, you're most likely better off with creating your own scripts.
There are 3rd party tools for rrdtool that might be easier to use. I haven't tried them yet, but here's one:
https://www.cacti.net/

But there you go, that's how I did it:
First you need to create a rrd (round robin database):
https://oss.oetiker.ch/rrdtool/doc/rrdcreate.en.html

An example for a database covering 5 years for a single band and 1 minute resolution would be:

rrdtool create kiwi.rrd \
--step 60 \
DS:10m:GAUGE:120:-200:0 \
RRA:LAST:0.5:1:2628000

Then you can feed the database with values from kiwirecorder.py:
https://oss.oetiker.ch/rrdtool/doc/rrdupdate.en.html

workingdir=~/kiwiclient

samplecount=15
lowfreq=950
highfreq=1050

v10m=`$workingdir/kiwirecorder.py --nb --server-host=192.168.8.73 --server-port=8073 --freq=27999 --S-meter=$samplecount --m usb -L $lowfreq -H $highfreq |awk '{print $2}'`

rrdtool update $workingdir/rrd/kiwi.rrd N:$v10m

That has to be run every minute, for example by a cronjob.
Note that kiwirecorder.py has sometimes random delays where it does nothing(?), so you can't use the entire minute for collecting s-meter data, but have to include some reserve time. I use max. 50% of the time but sometimes that's still not enough.

Finally you can create the graphs.
https://oss.oetiker.ch/rrdtool/doc/rrdgraph.en.html

RRDGRAPH="/usr/bin/rrdtool graph"
WWWPATH=/var/www/rrd/kiwi
$RRDGRAPH -v dBm/Hz $WWWPATH/kiwi-daily.png \
--end now --start end-86400s -w 1440 -h 500 -A -E \
DEF:v10m=kiwi.rrd:v10m:LAST:reduce=AVERAGE \
CDEF:v10mHz=v10m,20,- \ 
LINE2:v10mHz#0066ff:"10m"

I have the graphs created from a php-script, so they are only created when I visit the page.
The conversion from dBm-bandwidth to dBm/Hz could be better done at the database-update stage and not at the graph-stage as I did it.

I could, but the difficult part is not the script, but getting known to rrdtool. It's pointless if you don't understand how rrdtool works. Once you understand how rrdtool works, you're most likely better off with creating your own scripts.
There are 3rd party tools for rrdtool that might be easier to use. I haven't tried them yet, but here's one:
https://www.cacti.net/

But there you go, that's how I did it:
First you need to create a rrd (round robin database):
https://oss.oetiker.ch/rrdtool/doc/rrdcreate.en.html

An example for a database covering 5 years for a single band and 1 minute resolution would be:

rrdtool create kiwi.rrd \
--step 60 \
DS:10m:GAUGE:120:-200:0 \
RRA:LAST:0.5:1:2628000

Then you can feed the database with values from kiwirecorder.py:
https://oss.oetiker.ch/rrdtool/doc/rrdupdate.en.html

workingdir=~/kiwiclient

samplecount=15
lowfreq=950
highfreq=1050

v10m=`$workingdir/kiwirecorder.py --nb --server-host=192.168.8.73 --server-port=8073 --freq=27999 --S-meter=$samplecount --m usb -L $lowfreq -H $highfreq |awk '{print $2}'`

rrdtool update $workingdir/rrd/kiwi.rrd N:$v10m

That has to be run every minute, for example by a cronjob.
Note that kiwirecorder.py has sometimes random delays where it does nothing(?), so you can't use the entire minute for collecting s-meter data, but have to include some reserve time. I use max. 50% of the time but sometimes that's still not enough.

Finally you can create the graphs.
https://oss.oetiker.ch/rrdtool/doc/rrdgraph.en.html

RRDGRAPH="/usr/bin/rrdtool graph"
WWWPATH=/var/www/rrd/kiwi
$RRDGRAPH -v dBm/Hz $WWWPATH/kiwi-daily.png \
--end now --start end-86400s -w 1440 -h 500 -A -E \
DEF:v10m=kiwi.rrd:v10m:LAST:reduce=AVERAGE \
CDEF:v10mHz=v10m,20,- \ 
LINE2:v10mHz#0066ff:"10m"

I have the graphs created from a php-script, so they are only created when I visit the page.
The conversion from dBm-bandwidth to dBm/Hz could be better done at the database-update stage and not at the graph-stage as I did it.

That's understandable. I must say KiwiSDR is one of the best supported products I have ever owned, and also most valuable for that price. Where else do you get new features and bugfixes almost every week? You do an excellent job. Thank you.

That's understandable. I must say KiwiSDR is one of the best supported products I have ever owned, and also most valuable for that price. Where else do you get new features and bugfixes almost every week? You do an excellent job. Thank you.

That's understandable. I must say KiwiSDR is one of the best supported products I have ever owned, and also most valuable for that price. Where else do you get new features and bugfixes almost every week? You do an excellent job. Thank you.