Derive units are now available in the core and has their relevant input
values routed and outputs are looped back into the core router
Fixed the dlpak manifest which had no signal descriptors
SignalDescriptor now have a new origin field to distinguish "source"
from "derived" signals, this is ahead of the internal loopback system
for data processing, all external conectors must use source, derived is
targeted only for internal use
The connector registry has been adapted to now have a unique internal
loopback, this does not have an associated endpoint so it is stored
apart and all relevant functions have been updated to include it for
proper handling of signals by DLPak etc
ValueBuffer is now the default buffer object for storing data for
recording and processing purposes, a simple recording implementation has
been done, core.py example starts recording as soon as the core has
started then on exit it saves the output as a csv file through the
ValueBuffer export_csv method
Added timestamping to ValueDescriptor to be able to record on a
timebase, timebase uses monotonic_ns() which is a system wide timebase
that can be called by connectors written in a host of languages
Added timeout to signal descriptors, live values now return None when
they are timed out
Removed useless tests, will need to complete a more comprehensive test
suite however this is not the priority right now
Added a live value dict in the core whose values are populated by the
core's input thread
Implemented handshake in json server and handoff to endpoint
Endpoint handles connector handshake accept/decline then launches both
its IO threads alongside its heartbeat thread which contains simple
timeout logic, timeout calls connection handles to close, subsequently
killing the endpoint
Isolated the JsonServer to server.py inside protocols/json
Added specific errors for server startup timeout and server startup
failed
Refactored errors for Core to CoreError generic and refactored
StateError to CoreStateMismatchError derived from CoreError
h3cx