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Sapient protocol definitions

Apex contains the definitions for multiple Sapient protocols in protobuf format. Additionally, it can convert to Sapient v6 from BSI FLEX 335 V1, even though the definition of the former is not contained in the code explicitly, and is only available when converting to XML.

Having multiple versions of similar protobuf protocols requires a few adjustments:

  1. Each protocol lives in it's own subdirectory inside sapient_msg
  2. import statements should be adjusted to import from their own subdirectory, e.g. import "sapient_msg/location.proto"; becomes import "sapient_msg/bsi_flex_335_v1_0/location.proto";.
  3. Each protocol should live within it's own package, e.g. package sapient_msg becomes package sapient_msg.bsi_flex_335_v1_0.
  4. There is only one proto_options.proto file for all protocols. It lives directly under sapient_msg. There should no such file living inside each version subdirectory. As a result, import statements should be adjusted as necessary.

Finally, pre-commit will do the following (assuming it is installed):

  1. Create python bindings for all proto files
  2. Copy the bindings for the latest protocol to sapient_msg/latest

Note that pre-commit does not check for extra files. It is possible to regenerate all bindings with:

> rm sapient_msg/*_pb2.py
> rm sapient_msg/*_pb2.pyi
> rm sapient_msg/*/*_pb2.py
> rm sapient_mgs/*/*_pb2.pyi
> pre-commit run generate --all

This allows Apex to simply call import sapient_msg.latest where necessary, without worrying about versions.