sle

Overview ¶

Example: Pulling telemetry from a ground station with SLE

Every other example here is one end of a space link. This one is the link between two ground systems: a mission control centre opening a TCP connection to a ground station and asking for the frames it recovered.

Mission control (the SLE user):
  1. Send the TML context message, agreeing heartbeats
  2. BIND, authenticating with SHA-256 credentials
  3. START, asking for all frame qualities from now on
  4. Take transfer buffers as they arrive
  5. STOP, then UNBIND

Ground station (the SLE provider):
  Answers each of those, and once started delivers a real CADU that
  pkg/tmdl framed and pkg/tmsc wrapped.

The two halves talk over a real TCP connection on localhost. Nothing in pkg/sle opens a socket or starts a goroutine; both are the caller's, which is why the provider here runs in one this file started.