add nanopb (manual)

components/spotify/cspot/bell/nanopb/tests/common/unittestproto.proto

@@ -0,0 +1,43 @@
+syntax = "proto2";
+
+import 'nanopb.proto';
+
+message IntegerArray {
+    repeated int32 data = 1 [(nanopb).max_count = 10];
+}
+
+message FloatArray {
+    repeated float data = 1 [(nanopb).max_count = 10];
+}
+
+message StringMessage {
+    required string data = 1 [(nanopb).max_length = 10];
+}
+
+message BytesMessage {
+    required bytes data = 1 [(nanopb).max_size = 16];
+}
+
+message CallbackArray {
+    // We cheat a bit and use this message for testing other types, too.
+    // Nanopb does not care about the actual defined data type for callback
+    // fields.
+    repeated int32 data = 1;
+}
+
+message IntegerContainer {
+    required IntegerArray submsg = 1;
+}
+
+message CallbackContainer {
+    required CallbackArray submsg = 1;
+}
+
+message CallbackContainerContainer {
+    required CallbackContainer submsg = 1;
+}
+
+message StringPointerContainer {
+    repeated string rep_str = 1 [(nanopb).type = FT_POINTER];
+}
+