SatPI — Logic Encoder fork

An SAT>IP server for Linux (DVB-S/S2, DVB-T/T2, DVB-C), forked from Barracuda09/SATPI — all credit for the original project goes to its author.

This fork exists to make SatPI actually work on the Vu+ Duo 4K SE (Broadcom bcm7335 / NEXUS, dual FBC DVB-S2) — a box where upstream delivers no data at all on the second tuner bank and cannot switch DiSEqC (upstream issue #210, open since 2024). Verified end-to-end on OpenPLi 9.2 with DVBViewer switching three orbital positions (23.5E / 13E / 19.2E) while Enigma2 runs alongside.

Read the full investigation — first-hand write-up with measurements, packet captures and the driver-level details: Fixing SatPI on the Vu+ Duo 4K SE: FBC tuners, DiSEqC and DVBViewer

Tech stack

Layer	Technologies
Language	C++ (upstream SatPI codebase)
Protocols	SAT>IP over RTSP/HTTP — DVB-S/S2, DVB-T/T2, DVB-C
Target hardware	Vu+ Duo 4K SE — Broadcom bcm7335 / NEXUS, dual FBC DVB-S2
Build	ARM cross-toolchain, statically linked (-static -static-libstdc++ -static-libgcc)
Verified on	OpenPLi 9.2, DVBViewer clients, Enigma2 running alongside

Fixes in this fork

Area	Fix
socket/SocketClient.h	SIGSEGV on whitespace-only RTSP keepalive (headers[0] on empty vector)
main.cpp	Ignore SIGPIPE — a client closing TCP mid-write no longer kills the daemon
input/dvb/Frontend.cpp, mpegts/Filter.cpp	NEXUS demux model: same-fd DMX_SET_SOURCE, mid-stream ADD_PID, safe pids=all emulation
input/dvb/delivery/	DiSEqC + FBC: child tuners route DiSEqC through dup() of the already-open root frontend fd (minisatip parity), correct tone→voltage→cmd→mini-burst ordering
TransportParamVector.cpp, FrontendData.cpp	Case-insensitive SAT>IP transport values (pol, msys, plts, fec, ro, mtype, …)
Frontend.cpp, FrontendData.h/.cpp	On lock timeout with explicit hint params (plts/fec/ro), retune once with them relaxed to AUTO — clients like DVBViewer forward stale channel-list values (e.g. plts=off on pilots-on transponders) that can never lock

Vu+ Duo 4K SE deployment

• Cross-build with an ARM toolchain (e.g. arm-gnu-toolchain-13.3) and link statically: -static -static-libstdc++ -static-libgcc — the box's glibc is older than the toolchain's.
• Enable only the FBC root frontend of the bank you want — on bcm7335 the FBC children cannot emit DiSEqC (bcm7335_send_diseqc_msg times out on the child fd).
• Start satpi with --iface-name eth0 so the SSDP LOCATION advertises a usable address instead of 0.0.0.0.
• Reference config and init script: docs/SatPI.xml.vu-dueo4kse, docs/satpi.initd.vu-duo4kse.
• In Enigma2, mark the SatPI-owned tuners configMode=nothing so both worlds never open the same frontend.

The same binary should run on other images using the same driver stack (OpenATV, VTi) — it is statically linked and only needs /dev/dvb plus the XML config.

Quick start

git clone https://github.com/logicencoder/satpi.git
cd satpi
make
./satpi --help
./satpi            # needs privilege for tcp/udp port 554

• Web interface: http://<box-ip>:8875 (live frontend status, config editor)
• Device description (SSDP): http://<box-ip>:8875/desc.xml
• Build variants: make debug, make LIBDVBCSA=yes (OSCam/dvbapi), make ENIGMA=yes (Enigma2 toolchain), make non-c++17 (old toolchains)

For full upstream documentation see the SatPI wiki.

Features (from upstream)

• RTP/AVP, RTP/AVP/TCP and plain HTTP streaming
• DVB-S(2) requests transformed to DVB-C/T outputs
• Channel decryption via the DVB-API protocol with OSCam (dvbcsa)
• Virtual tuners: FILE, STREAMER (multicast/unicast), CHILDPIPE inputs
• Works with Tvheadend, DVBViewer, VDR, VLC, Elgato Sat>IP, satip-client

License & credit

GPL-2.0, same as upstream. Original project and author: Barracuda09/SATPI — if SatPI is useful to you, consider donating to the original author via the sponsor button on the upstream repo.

Fork maintained by Logic Encoder — https://logicencoder.com