syntax = "proto2"; import 'nanopb.proto'; message SubMessage { repeated int32 array = 1 [(nanopb).max_count = 8]; } /* Oneof in a message with other fields */ message OneOfMessage { required int32 prefix = 1; oneof values { int32 first = 5; string second = 6 [(nanopb).max_size = 8]; SubMessage third = 7; } required int32 suffix = 99; } /* Oneof in a message by itself */ message PlainOneOfMessage { oneof values { int32 first = 5; string second = 6 [(nanopb).max_size = 8]; SubMessage third = 7; } }