tests/regression/issue_545/submsg_callback.proto

syntax = "proto2";

import "nanopb.proto";

message SubMessage3 {
    required uint32 foo = 1;
}

message SubMessage2 {
    oneof oneof {
        SubMessage3 submsg = 1 [(nanopb).submsg_callback = true];
    }
}

message SubMessage1 {
    repeated SubMessage2 msgs = 1 [(nanopb).max_count = 16];
}

message MainMessage {
    required SubMessage1 msg = 1;
    required uint32 foo = 2;
}