First, create files in your websdr directory, adjust paths to your needs:

1: start-receiver.sh

#!/bin/bash
cd /opt/PhantomSDR-Plus/

#killall -s9 spectrumserver
#killall -s9 rx888_stream

## Files to load
FIFO=fifo.fifo
TOML=config-rx888mk2.toml

[ ! -e "$FIFO" ] && mkfifo $FIFO

./rx888_stream/target/release/rx888_stream -f ./rx888_stream/SDDC_FX3.img -s 60000000 -g 50 -m low -o - > $FIFO

#exit

2: start-websdr.sh

#!/bin/bash
cd /opt/PhantomSDR-Plus/

#killall -s9 spectrumserver
#killall -s9 rx888_stream

## Files to load
FIFO=fifo.fifo
TOML=config-rx888mk2.toml

[ ! -e "$FIFO" ] && mkfifo $FIFO

build/spectrumserver --config $TOML < $FIFO

#exit

3: stop-websdr.sh

#!/bin/bash
cd /opt/PhantomSDR-Plus/

systemctl stop websdr

systemctl stop receiver

killall -s 9 spectrumserver
killall -s 9 rx888_stream

Install the killall utill.

sudo apt-get -y install psmisc

Make all *.sh executable:
chmod +x *.sh
Make the service files and place them in /lib/systemd/system directory

4: receiver.service

[Unit]
Description=PhantomSDRPlus WebSDR
After=network-online.target
Before=websdr.service

[Service]
Type=exec
ExecStart=/opt/PhantomSDR-Plus/v2/start-receiver.sh
Restart=on-failure
RestartSec=5

[Install]
Alias=receiver.service
WantedBy=multi-user.target

5: websdr.service

[Unit]
Description=PhantomSDRPlus WebSDR
After=network-online.target receiver.service

[Service]
Type=exec
ExecStart=/opt/PhantomSDR-Plus/v2/start-websdr.sh
Restart=on-failure
RestartSec=5

[Install]
Alias=websdr.service
WantedBy=multi-user.target

Enable both services: systemctl enable receiver.service
systemctl enable websdr.service

Now start them: systemctl start receiver
systemctl start websdr

Also after a reboot it should start automaticly.

If you made a mistake, check sevices with: systemctl status receiver (or websdr) it will show you what went wrong.

That's all folks!

Thank you!!!

I will sent the invoice later