FR24FEED not working on RaspberryPi OS 12 bookworm on Pi4

Affects Pi4 only

If you have a Pi4 and are using a RTL-SDR dongle without any data flow, this could be a problem with the Pi4 kernel and not the FR24 feeder itself.

You can confirm this by installing rtl-sdr package 

$sudo apt update

$sudo apt install rtl-sdr

Run the test

#stop fr24feed first

$sudo systemctl stop fr24feed

$rtl_test
      Using device 0: Generic RTL2832U OEM
      rtlsdr_read_reg failed with -7
      rtlsdr_write_reg failed with -7
      rtlsdr_read_reg failed with -7
      rtlsdr_write_reg failed with -7
      rtlsdr_read_reg failed with -7

If you get a similar out, you need to upgrade the Pi's firmware. Run the following command and reboot the pi after the upgrade is complete

$sudo rpi-update