1// This is an example of how to handle 'union' style messages
2// with nanopb, without allocating memory for all the message types.
3//
4// There is no official type in Protocol Buffers for describing unions,
5// but they are commonly implemented by filling out exactly one of
6// several optional fields.
7
8syntax = "proto2";
9
10message MsgType1
11{
12    required int32 value = 1;
13}
14
15message MsgType2
16{
17    required bool value = 1;
18}
19
20message MsgType3
21{
22    required int32 value1 = 1;
23    required int32 value2 = 2;
24}
25
26message UnionMessage
27{
28    optional MsgType1 msg1 = 1;
29    optional MsgType2 msg2 = 2;
30    optional MsgType3 msg3 = 3;
31}
32
33