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authorRomain Forlot <romain.forlot@iot.bzh>2017-06-20 10:24:05 +0000
committerRomain Forlot <romain.forlot@iot.bzh>2017-06-20 10:24:05 +0000
commit32e25cbca210a359b09768537b6f443fe90a3070 (patch)
tree3309794c15d8a8f8e9c1c08cad072ee1378813ba /libs/nanopb/examples/using_union_messages/unionproto.proto
parent76c43dec62b2e21cd6446360c00d4fe6b437533f (diff)
Separation Generator to a dedicated repo
Change-Id: Id94831651c3266861435272a6e36c7884bef2c45 Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>
Diffstat (limited to 'libs/nanopb/examples/using_union_messages/unionproto.proto')
-rw-r--r--libs/nanopb/examples/using_union_messages/unionproto.proto32
1 files changed, 32 insertions, 0 deletions
diff --git a/libs/nanopb/examples/using_union_messages/unionproto.proto b/libs/nanopb/examples/using_union_messages/unionproto.proto
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index 0000000..209df0d
--- /dev/null
+++ b/libs/nanopb/examples/using_union_messages/unionproto.proto
@@ -0,0 +1,32 @@
+// This is an example of how to handle 'union' style messages
+// with nanopb, without allocating memory for all the message types.
+//
+// There is no official type in Protocol Buffers for describing unions,
+// but they are commonly implemented by filling out exactly one of
+// several optional fields.
+
+syntax = "proto2";
+
+message MsgType1
+{
+ required int32 value = 1;
+}
+
+message MsgType2
+{
+ required bool value = 1;
+}
+
+message MsgType3
+{
+ required int32 value1 = 1;
+ required int32 value2 = 2;
+}
+
+message UnionMessage
+{
+ optional MsgType1 msg1 = 1;
+ optional MsgType2 msg2 = 2;
+ optional MsgType3 msg3 = 3;
+}
+