feat: initial protocol definition

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

proto/http.proto

@@ -0,0 +1,27 @@
+syntax = "proto3";
+
+package edgehog_device_forwarder_proto;
+
+message Http {
+    oneof message {
+        Request request = 1;
+        Response response = 2;
+    }
+
+    message Request {
+        // ID univoco che identifica ciascuna richiesta http e la relativa risposta
+        bytes request_id = 1;
+        string path = 2;
+        string method = 3;
+        optional string querystring = 4;
+        map<string, string> headers = 5;
+        optional bytes payload = 6;
+    }
+
+    message Response {
+        bytes request_id = 1;
+        uint32 status_code = 2;
+        map<string, string> headers = 3;
+        optional bytes payload = 4;
+    }
+}

proto/message.proto

@@ -0,0 +1,13 @@
+syntax = "proto3";
+
+package edgehog_device_forwarder_proto;
+
+import "proto/http.proto";
+import "proto/ws.proto";
+
+message Message {
+    oneof protocol {
+        Http http = 1;
+        WebSocket ws = 2;
+    }
+}

proto/ws.proto

@@ -0,0 +1,21 @@
+syntax = "proto3";
+
+package edgehog_device_forwarder_proto;
+
+message WebSocket {
+    // ID che identifica ciascuna connessione websocket fra ttyd e il device (e fra edgehog e una pagina web della stessa sessione)
+    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; // u16
+        optional string reason = 2;
+    }
+}