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QRET Launch Control Protocol

The QLCP protocol is a binary protocol used by launch control for ground communications between the launch control server and control nodes. It supports remote actuator control and data acquisition from control nodes for pre-launch systems control.

Network Configuration

SSDP Discovery

The server announces its presence via SSDP multicast. Devices listen for this broadcast to discover the server.

  • Multicast address: 239.255.255.250
  • Multicast port: 1900
  • Search target: urn:qretprop:espdevice:1

The server sends the following M-SEARCH packet:

M-SEARCH * HTTP/1.1\r\n
HOST: 239.255.255.250:1900\r\n
MAN: "ssdp:discover"\r\n
MX: 2\r\n
ST: urn:qretprop:espdevice:1\r\n
USER-AGENT: QRET/1.0\r\n
\r\n

When a device receives this packet, it extracts the server's IP address from the UDP source address of the M-SEARCH packet. It then opens a TCP connection to the server.

TCP

  • Server listen port: 50000
  • The server never connects to devices. Devices always initiate TCP connections to the server.

UDP

  • Server listen port: 50001
  • The server listens through UDP for DATA packets ONLY. DATA packets MUST be sent through UDP.

More Information

Refer to PROTOCOL_WALKTHROUGH.md for an in-depth explanation of all packet types and enums.

Build Instructions

To compile the library as a CMake package, run:

cmake -S . -B build/ -G <build_system>
cmake --build build/
cmake --install build/ --prefix ./dist

If using as a Git submodule add:

add_subdirectory(qlcp)
target_link_libraries(your_project_name PRIVATE qlcp::qlcp)

to your CMakeLists.txt.