diff --git a/gameserver/bin/connection.ml b/gameserver/bin/connection.ml
index 8c888ef..19aa97e 100644
--- a/gameserver/bin/connection.ml
+++ b/gameserver/bin/connection.ml
@@ -26,6 +26,7 @@ let handle pk =
   | None -> printf "unhandled cmd: %d\n%!" pk.cmd; None
 
 let rec run ic oc =
+  let open Packet in
   let* pk = read ic in
 
   let head = Hex.show (Hex.of_string pk.head) in
@@ -34,7 +35,7 @@ let rec run ic oc =
   printf "packet cmd: %d, head: %s, body: %s\n%!" pk.cmd head body;
 
   let* () = match handle pk with
-  | Some pk -> write oc pk
+    |Some res -> (Lwt_list.iter_s (fun pk -> write oc pk) res.packets)
   | None -> return_unit
   in
 
diff --git a/gameserver/bin/packet.ml b/gameserver/bin/packet.ml
index 994060f..4b1825f 100644
--- a/gameserver/bin/packet.ml
+++ b/gameserver/bin/packet.ml
@@ -2,6 +2,7 @@ open Lwt
 open Lwt.Syntax
 
 type packet = { cmd: int; head: string; body: string }
+type net_result = { packets: packet list }
 
 let read ic =
   let open Lwt_io in
@@ -37,6 +38,9 @@ let pack cmd en data =
   en data encoder;
 
   let buf = Pbrt.Encoder.to_string encoder in
-  { cmd = cmd; head = ""; body = buf; }
+  { packets = [{ cmd = cmd; head = ""; body = buf; }] }
 
-let empty cmd = { cmd = cmd; head = ""; body = "" }
+let merge lhs rhs =
+  { packets = lhs.packets @ rhs.packets }
+
+let empty cmd = {packets = [{ cmd = cmd; head = ""; body = "" }]}