protocol: start a new attempt at handling the protocol

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This is only the framework for a new protocol handler that should simplify
adding, extending and debugging the actual protocol messages.

The summary is:
- each protocol interaction is a subclass of Msg() that handles the data sent
  and received from the device.
- the list of messages for each device is stored in a dictionary the caller
  initializes by providing the protocol version
- those messages are addressable via the Interactions enum through the
  Protocol class
- the messages can be run via execute(), taking and setting the obvious
  properties on the object
- actual communication is done via a single callback that takes/returns a
  NordicData object for the request/reply.

So after the basic setup, the caller can do this:
   p = Protocol(ProtocolVersion.INTUOS_PRO)
   name = p.execute(Interactions.GET_NAME).name
   p.execute(Interactions.SET_TIME, time.time())

This completely separates the protocol from the implementation where we want
the result of that exchange, ideally paving the way for better testing and
easier debugging of what's happening on the wire. Well, ether.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

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This commit is contained in:

Peter Hutterer 2019-08-02 10:13:50 +10:00

parent 910bea8898

commit a817d10cc7

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