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What version of libsdrplay do you have installed? Support for the RSP1B was added in 3.14 and the RSPdxR2 in 3.15. Those symbols are probably missing due to you having an older version of the API installed.

==> Avvio di build() in corso...
[ 50%] Building C object CMakeFiles/rsp_tcp.dir/rsp_tcp.c.o
/home/simona/.cache/yay/rsp_tcp-git/src/RSPTCPServer/rsp_tcp.c: In function ‘event_callback’:
/home/simona/.cache/yay/rsp_tcp-git/src/RSPTCPServer/rsp_tcp.c:610:14: error: ‘sdrplay_api_DeviceFailure’ undeclared (first usein this function); did you mean ‘sdrplay_api_DeviceParamsT’?
610 |         case sdrplay_api_DeviceFailure:
|              ^~~~~~~~~~~~~~~~~~~~~~~~~
|              sdrplay_api_DeviceParamsT
/home/simona/.cache/yay/rsp_tcp-git/src/RSPTCPServer/rsp_tcp.c:610:14: note: each undeclared identifier is reported only once for each function it appears in
/home/simona/.cache/yay/rsp_tcp-git/src/RSPTCPServer/rsp_tcp.c: In function ‘hardware_ver_to_model’:
/home/simona/.cache/yay/rsp_tcp-git/src/RSPTCPServer/rsp_tcp.c:861:14: error: ‘SDRPLAY_RSP1B_ID’ undeclared (first use in this function); did you mean ‘SDRPLAY_RSP1_ID’?
861 |         case SDRPLAY_RSP1B_ID:
|              ^~~~~~~~~~~~~~~~
|              SDRPLAY_RSP1_ID
/home/simona/.cache/yay/rsp_tcp-git/src/RSPTCPServer/rsp_tcp.c:863:14: error: ‘SDRPLAY_RSPdxR2_ID’ undeclared (first use in this function); did you mean ‘SDRPLAY_RSPdx_ID’?
863 |         case SDRPLAY_RSPdxR2_ID:
|              ^~~~~~~~~~~~~~~~~~
|              SDRPLAY_RSPdx_ID
make[2]: *** [CMakeFiles/rsp_tcp.dir/build.make:79: CMakeFiles/rsp_tcp.dir/rsp_tcp.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:87: CMakeFiles/rsp_tcp.dir/all] Error 2
make: *** [Makefile:156: all] Error 2

CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
Compatibility with CMake < 3.5 has been removed from CMake.

Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
to tell CMake that the project requires at least <min> but has been updated
to work with policies introduced by <max> or earlier.

Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

I am running into this problem when building this package:

==> Starting build()...
CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

It seems this is the proper, actively maintained continuation fork:

https://github.com/ON5HB/rsp_tcp

Here's a systemd service that works with this package:

If you're adding this as an admin outside the package, I recommend putting this in /etc/systemd/system/rsp_tcp.service. If you build it into this package, I recommend /usr/lib/systemd/system/rsp_tcp.service.

[Unit]
Description=RSP TCP Server
After=network.target sdrplay.service

[Service]
Restart=on-failure
RestartSec=1
EnvironmentFile=/etc/conf.d/rsp_tcp
ExecStart=/usr/bin/rsp_tcp "$RSP_TCP_ARGS"

[Install]
WantedBy=multi-user.target

And this is what I'm using for /etc/conf.d/rsp_tcp:

# CLI arguments to pass to rsp_tcp.  See rsp_tcp --help.
RSP_TCP_ARGS="-a 0.0.0.0"