Share expirience

[Sergey-R5AU]

Hi All !

i wonna to share my experience with RemSDR:

PM2 service not using in shared SW at beginning and better to disable this service and remove completely, as result it will be
low CPU usage and removing packets dropout even with WiFi:

sudo pm2 stop all
sudo env PATH=$PATH:/usr/bin /usr/lib/node_modules/pm2/bin/pm2 unstartup systemd -u pi --hp /home/pi
sudo pm2 unstartup
sudo npm remove pm2 -g
sudo reboot

That all folks !

my screen short with 2 x RPI + 2 x Pluto:

BTW Cooler usage may be more efficient based on RPI defaults, means this feature can be disabled in RemSDR SW:

boot/overlays/README
put into /boot/config.txt :
dtoverlay=gpio-fan,gpiopin=12,temp=45000,hyst=40000

gpio PIN=12 will put in High state in case 45 Celsius of CPU and sett Low state with 40 Celcius of CPU
works without issues

Name: gpio-fan
Info: Configure a GPIO pin to control a cooling fan.
Load: dtoverlay=gpio-fan,=
Params: gpiopin GPIO used to control the fan (default 12)
temp Temperature at which the fan switches on, in
millicelcius (default 55000)
hyst Temperature delta (in millicelcius) below
temp at which the fan will drop to minrpm
(default 10000)

[Sergey-R5AU]

Other cases what recognized with Rapsberry:
To maximise live cycle i am using RPi with SSD connected to USB
Unfortunately, some time UDP transmission drops packets that we can see on Packets Datagram on RemSDR screen(upper-left corner), this is result effects of the different things related to RPI and SSD. I spend couple of time and completely isolate that issues even in case connection via WiFI:

1. Some SSD are not supported in operation via USB3 on RPI, in that case necessary to introduce QUIRK mode for SSD:

i used solution from here what useful: https://io.24hoursmedia.com/tech-notes/usb-ssd-fails-usb3-raspberry-pi-4

2. In case sending many datagram with UDP packet ethernet buffer on default could be not enough for such operations, solution:
   Increasing value of buffer.
   Current value of the buffer you can see like: sudo sysctl -a | grep rmem
   To increase the value need to put necessary value into the file /etc/sysctl.d/local.conf

   sudo nano /etc/sysctl.d/local.conf
   I set :
   net.core.rmem_default =524288
   net.core.rmem_max = 524288

Then: sudo reboot

Works like a charm !

PS: tested during over 48hr via WiFi and OpenVPN