diff --git a/dc/m6220-proxy/proto/.gitignore b/dc/m6220-proxy/proto/.gitignore
new file mode 100644
index 0000000..3cf12ab
--- /dev/null
+++ b/dc/m6220-proxy/proto/.gitignore
@@ -0,0 +1 @@
+proxy.pb.go
diff --git a/dc/m6220-proxy/proto/BUILD.bazel b/dc/m6220-proxy/proto/BUILD.bazel
new file mode 100644
index 0000000..4e0ae7e
--- /dev/null
+++ b/dc/m6220-proxy/proto/BUILD.bazel
@@ -0,0 +1,23 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//proto:def.bzl", "go_proto_library")
+
+proto_library(
+    name = "proto_proto",
+    srcs = ["proxy.proto"],
+    visibility = ["//visibility:public"],
+)
+
+go_proto_library(
+    name = "proto_go_proto",
+    compilers = ["@io_bazel_rules_go//proto:go_grpc"],
+    importpath = "code.hackerspace.pl/hscloud/dc/m6220-proxy/proto",
+    proto = ":proto_proto",
+    visibility = ["//visibility:public"],
+)
+
+go_library(
+    name = "go_default_library",
+    embed = [":proto_go_proto"],
+    importpath = "code.hackerspace.pl/hscloud/dc/m6220-proxy/proto",
+    visibility = ["//visibility:public"],
+)
diff --git a/dc/m6220-proxy/proto/proxy.proto b/dc/m6220-proxy/proto/proxy.proto
new file mode 100644
index 0000000..b8444c3
--- /dev/null
+++ b/dc/m6220-proxy/proto/proxy.proto
@@ -0,0 +1,16 @@
+syntax = "proto3";
+package proto;
+option go_package = "code.hackerspace.pl/hscloud/dc/m6220-proxy/proto";
+
+message RunCommandRequest {
+    string command = 1;
+};
+
+message RunCommandResponse {
+    string effective_command = 1;
+    repeated string lines = 2;
+};
+
+service M6220Proxy {
+    rpc RunCommand(RunCommandRequest) returns (RunCommandResponse);
+};