Benchmark and decide for the use of Proto3/FlatBuffer/CapnProto/DDS in OSI

[HannesSchneiderAVL]

We would like to use the OSI with csharp environment. But compiling classes for c# seems to be only supported for proto3. When compiling this version (changed the syntax variable to proto3) I get following errors:

osi_common.proto:14:14: Explicit 'optional' labels are disallowed in the Proto3
syntax. To define 'optional' fields in Proto3, simply remove the 'optional' labe
l, as fields are 'optional' by default.

for each definition.

then I removed the invalid optional statements.

and then following error occurs:

osi_common.proto: Explicit default values are not allowed in proto3.

by removing also the explicit values I was able to generete the class.

Hello and welcome on board!
Please try to use a proto3 compiler but leave the syntax variable as "proto2". It just indicates the syntax of the files and does not restrict the usage of newer compiler (as far as I know :) )
I am curious if the C# compiler also works with proto2 syntax files, because the C++ compiler performs well (see e.g. the TravisCI log with proto3 compiler link)

[pmai]

The original protobuf-csharp-port only supports proto2 and is still available, though in maintenance-only mode, see https://github.com/jskeet/protobuf-csharp-port

That code was merged into the mainline distribution and upgraded to proto3, however proto2 support was dropped as far as I can tell in the process:

http://stackoverflow.com/questions/36742747/proto2-vs-proto3-in-c-sharp

Discussions about moving to either Proto3, FlatBuffers or something like Cap'n'Proto would be a medium-term thing I think.

[HannesSchneiderAVL]

Thank you for your response. I have already upgraded to proto3. Unfortunately this is not possible without changing syntax variable and some other smaller modifications. Can I contact one of you for further details on the OSI interface? I could not find a contact email of Mr. Van Driesten. TY

carlo.van-driesten@bmw.de
I will make it visible in my profile :)

I will keep this issue open, adding the question of using flatbuffer/proto3 or captainProto