feat: initial protocol definition

Signed-off-by: rgallor <riccardo.gallo@secomind.com>

proto/edgehog/device/forwarder/http.proto

@@ -0,0 +1,30 @@
+// Copyright 2023 SECO Mind Srl
+// SPDX-License-Identifier: Apache-2.0
+
+syntax = "proto3";
+
+package edgehog.device.forwarder;
+
+message Http {
+    oneof message {
+        Request request = 1;
+        Response response = 2;
+    }
+
+    message Request {
+        bytes request_id = 1;
+        string path = 2;
+        string method = 3;
+        string query_string = 4;
+        map<string, string> headers = 5;
+        bytes body = 6;
+        uint32 port = 7;
+    }
+
+    message Response {
+        bytes request_id = 1;
+        uint32 status_code = 2;
+        map<string, string> headers = 3;
+        bytes body = 4;
+    }
+}

proto/edgehog/device/forwarder/message.proto

@@ -0,0 +1,16 @@
+// Copyright 2023 SECO Mind Srl
+// SPDX-License-Identifier: Apache-2.0
+
+syntax = "proto3";
+
+package edgehog.device.forwarder;
+
+import "edgehog/device/forwarder/http.proto";
+import "edgehog/device/forwarder/ws.proto";
+
+message Message {
+    oneof protocol {
+        Http http = 1;
+        WebSocket ws = 2;
+    }
+}

proto/edgehog/device/forwarder/ws.proto

@@ -0,0 +1,23 @@
+// Copyright 2023 SECO Mind Srl
+// SPDX-License-Identifier: Apache-2.0
+
+syntax = "proto3";
+
+package edgehog.device.forwarder;
+
+message WebSocket {
+    bytes socket_id = 1;
+
+    oneof message {
+        string text = 2;
+        bytes binary = 3;
+        bytes ping = 4;
+        bytes pong = 5;
+        Close close = 6;
+    }
+
+    message Close {
+        uint32 code = 1;
+        string reason = 2;
+    }
+}