Hi all,

Since a bit we have the option to give every receiver a fifo input, this works the same as stdin, but you can run all of them this way. I do not want to use Soapy as fifo is much easier.

Here we go make a start-websdr.sh script:
#!/bin/bash
cd /opt/novasdr/

# kill nova and all receivers

killall -s 9 novasdr-server
killall -s 9 rx888

## Files to load
FIFO0=rx0.fifo
#FIFO1=rx1.fifo
#FIFO2=rx2.fifo
#FIFO3=rx3.fifo
#FIFO4=rx4.fifo

## Make all fifo's
[ ! -e "$FIFO0" ] && mkfifo $FIFO0
#[ ! -e "$FIFO1" ] && mkfifo $FIFO1
#[ ! -e "$FIFO2" ] && mkfifo $FIFO2
#[ ! -e "$FIFO3" ] && mkfifo $FIFO3
#[ ! -e "$FIFO4" ] && mkfifo $FIFO4

# Push all receivers into fifox

./rx888_stream/target/release/rx888_stream -f ./rx888_stream/SDDC_FX3.img -s 60000000 -g 50 -m low -o - > $FIFO0 &

sleep 3

#next receiver

#sleep 3

# Start nova itself

./novasdr-server --no-file-log

Make stop-websdr.sh:

#!/bin/bash
cd /opt/novasdr/

killall -s 9 novasdr-server

exit

You can also kill all reaceivers in the stop-script if you want, no need to remove the fifo's.

Make a systemd script like this: nano /usr/lib/systemd/system/websdr.service

[Unit]
Description=NovaSDR WebSDR
After=network-online.target

[Service]
Type=exec
ExecStart=/opt/novasdr/start-websdr.sh
ExecStop=/opt/novasdr/stop-websdr.sh
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target

'systemctl enable websdr' to make it startable.

Next run 'nova-sdr-server configure' and make it set this:

    {
      "id": "rx0",
      "input": {
        "accelerator": "clfft",
        "audio_compression": "adpcm",
        "audio_sps": 12000,
        "brightness_offset": 0,
        "defaults": {
          "frequency": 3630000,
          "modulation": "LSB",
          "ssb_highcut_hz": 2800,
          "ssb_lowcut_hz": 100
        },
        "driver": {
          "format": "s16",
          "kind": "fifo",
          "path": "rx0.fifo"
        },
        "fft_size": 524288,
        "fft_threads": 2,
        "frequency": 0,
        "signal": "real",
        "smeter_offset": -30,
        "sps": 60000000,
        "ssb_highcut_hz": 2800,
        "ssb_lowcut_hz": 100,
        "waterfall_compression": "zstd",
        "waterfall_size": 2048
      },
      "name": "RX888MK2 (0-30MHz)"
    },

After you are done: 'systemctl start websdr' (or reboot)

Now your websdr should run via fifo's, it's the same as stdin but piped to fifo, so you can run more then 1 receiver this way.

To add an RSP1....patched player version 2.13 API : https://github.com/ON5HB/SDR_Play/tree/main


Line
play_sdr -f 1024000 -s 2048000 -R 40 -l 1 -n 0 -x 16 - > $FIFO1 &

Receivers.config

    {
      "id": "rx3",
      "input": {
        "accelerator": "clfft",
        "audio_compression": "adpcm",
        "audio_sps": 12000,
        "brightness_offset": -6,
        "defaults": {
          "frequency": 648000,
          "modulation": "AM",
          "squelch_enabled": false
        },
        "driver": {
          "format": "s16",
          "kind": "fifo",
          "path": "rx1.fifo"
        },
        "fft_size": 131072,
        "frequency": 1024000,
        "signal": "iq",
        "smeter_offset": -50,
        "sps": 2048000,
        "waterfall_compression": "zstd",
        "waterfall_size": 2048
      },
      "name": "SDRplay RSP2"
    }


That's it.

Airspy Discovery....also very simple...I use serial-number (if you have more):

airspyhf_rx -s "0xDD52EB5DAC3839F7" -f 0.456 -a 912000 -r stdout > $FIFO2 &

Receivers.json

    {
      "id": "rx3",
      "input": {
        "accelerator": "clfft",
        "audio_compression": "adpcm",
        "audio_sps": 12000,
        "brightness_offset": 0,
        "defaults": {
          "frequency": 648000,
          "modulation": "AM",
          "squelch_enabled": false
        },
        "driver": {
          "format": "cf32",
          "kind": "fifo",
          "path": "rx2.fifo"
        },
        "fft_size": 131072,
        "frequency": 456000,
        "signal": "iq",
        "smeter_offset": -40,
        "sps": 912000,
        "waterfall_compression": "zstd",
        "waterfall_size": 2048
      },
      "name": "Airspy Disco"
    }

Airspy can be installed with 'apt install airspy*' installs both Airspy (R2+Mini) and AirspyHF (Disco+HF)

Not that hard to make working.