sdrdevilsrv
Modification of hackrf_tcp to connect directly to sdrangel. Modified from the HackRF repository. Implements sdrangel's SDRA protocol.
Dependencies / Compile
apt-get install hackrf
gcc -pthread -I /usr/local/include/libhackrf -o sdrdevilsrv main.c -lhackrf
./sdrdevilsrv
Description
The SDR workbench application sdrangel needs no introduction. It comes in a locally executed form with GUI, but it can also be run in headless mode for streaming IQ over a LAN. The server application, sdrangelsrv, is stable and no doubt extremely capable, but it uses a lot of CPU when serving IQ to a client. On a Raspberry Pi 4, this limits it to about 2.3MS/s. sdrdevilsrv eliminates all background processing and exclusively moves IQ samples from USB into the LAN. On the Pi 4, it can serve up to 17MS/s before the ethernet controller becomes a bottleneck at 285Mbps. Parameters such as center freq, sample rate, amplifier stages and baseband BW can be changed from the sdrangel client at runtime.
Known issues
The signal degradation at high amplification has been resolved. Turns out sdrangel expects unsigned samples while hackrf_tcp sends signed samples. Somehow this produced almost usable IQ.
Only compatible with HackRF One for now! Working on implementations for RTL-SDR and nuand BladeRF 2.0.