Given a sample vspec entry:

Media.Played.Source:
  datatype: string
  type: actuator
  allowed: ['UNKNOWN', 'SIRIUS_XM', 'AM', 'FM', 'DAB', 'TV', 'CD', 'DVD', 'AUX', 'USB', 'DISK', 'BLUETOOTH', 'INTERNET', 'VOICE', 'BEEP']
  description: Media selected for playback

The protobuf exporter currently generates this protobuf:

message MessageTitle {
  string Source = 1;
}

However according to the documentation the generated datatype should also restrict the possible values and treat every value outside of it as an error.

A protobuf enum would solve this by restricting the possible values to just the defined set.

I would expected the generated protobuf to be like this:

enum MessageTitleSourceEnum {
  UNKNOWN = 0;
  SIRIUS_XM = 1;
  AM = 2;
  FM = 3;
  DAB = 4;
  TV = 5;
  CD = 6;
  DVD = 7;
  AUX = 8;
  USB = 9;
  DISK = 10;
  BLUETOOTH = 11;
  INTERNET = 12;
  VOICE = 13;
  BEEP = 14;
}

message MessageTitle {
  MessageTitleSourceEnum Source = 1;
}