diff --git a/common/proto/navka.proto b/common/proto/navka.proto
new file mode 100644
index 0000000..cf1f202
--- /dev/null
+++ b/common/proto/navka.proto
@@ -0,0 +1,8 @@
+syntax = "proto3";
+package navka;
+
+message HidReport { bytes data = 1; }
+
+service Relay {
+  rpc Stream (stream HidReport) returns (stream HidReport);
+}