Fix up sync version to new protocol

src/connection.h

@@ -4,16 +4,24 @@
 
 #include <stdint.h>
 
+enum class OPCODE : uint32_t {
+    HANDSHAKE = 0,
+    FRAME = 1,
+    CLOSE = 2,
+};
+
 struct RpcMessageFrame {
+    OPCODE opcode;
     uint32_t length;
-    char message[64 * 1024 - sizeof(uint32_t)];
+    char message[64 * 1024 - 8];
 };
 
 struct RpcConnection {
     void (*onConnect)() = nullptr;
     void (*onDisconnect)() = nullptr;
+    char appId[64];
 
-    static RpcConnection* Create();
+    static RpcConnection* Create(const char* applicationId);
     static void Destroy(RpcConnection*&);
     void Open();
     void Close();