diff --git a/src/transport/tcp/ssl_channel.erl b/src/transport/tcp/ssl_channel.erl
index 4c6d251..3da6bd2 100644
--- a/src/transport/tcp/ssl_channel.erl
+++ b/src/transport/tcp/ssl_channel.erl
@@ -117,14 +117,14 @@ handle_info({'DOWN', _, process, HostPid, Reason}, State = #state{uuid = UUID, h
     logger:debug("[ws_channel] uuid: ~p, channel will close because host exited with reason: ~p", [UUID, Reason]),
     {stop, Reason, State};
 
-handle_info({ssl, Socket, PacketBin}, State = #state{transport = Transport, socket = Socket, host_pid = HostPid, inflight = Inflight}) when is_binary(PacketBin) ->
+handle_info({ssl, Socket, PacketBin}, State = #state{socket = Socket}) when is_binary(PacketBin) ->
     try binary_to_term(PacketBin, [safe]) of
         {request, Ref, Body} ->
-            handle_request_frame(Ref, Body, Transport, Socket, State);
+            handle_request_frame(Ref, Body, State);
         {message, Body} ->
-            handle_message_frame(Body, HostPid, State);
+            handle_message_frame(Body, State);
         {command_response, Ref, Response} ->
-            handle_command_response_frame(Ref, Response, Inflight, State);
+            handle_command_response_frame(Ref, Response, State);
         Other ->
             logger:warning("[ssl_channel] unsupported packet: ~p", [Other]),
             {stop, bad_packet, State}
@@ -161,10 +161,8 @@ code_change(_OldVsn, State, _Extra) ->
 %%%% helper methods
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
--spec handle_request_frame(reference(), tuple(), module(), any(), #state{}) -> {noreply, #state{}} | {stop, term(), #state{}}.
-handle_request_frame(Ref, {auth_request, #{uuid := UUID, token := Token, timestamp := Timestamp}},
-    Transport, Socket, State) ->
-
+-spec handle_request_frame(reference(), tuple(), #state{}) -> {noreply, #state{}} | {stop, term(), #state{}}.
+handle_request_frame(Ref, {auth_request, #{uuid := UUID, token := Token, timestamp := Timestamp}}, State = #state{transport = Transport, socket = Socket}) ->
     logger:debug("[ws_channel] auth uuid: ~p", [UUID]),
     case auth(Token, UUID, Timestamp) of
         ok ->
@@ -191,22 +189,22 @@ handle_request_frame(Ref, {auth_request, #{uuid := UUID, token := Token, timesta
             logger:warning("[ws_channel] uuid: ~p, token: ~p, auth failed, reason: ~p", [UUID, Token, Reason]),
             {stop, Reason, State}
     end;
-handle_request_frame(Ref, {container, ContainerCommand}, _Transport, _Socket, State) ->
+handle_request_frame(Ref, {container, ContainerCommand}, State) ->
     logger:warning("[ws_channel] unsupported request message type: container, ref: ~p, command: ~p", [Ref, ContainerCommand]),
     {stop, normal, State};
-handle_request_frame(Ref, Body, _Transport, _Socket, State) ->
+handle_request_frame(Ref, Body, State) ->
     logger:warning("[ws_channel] unsupported request body, ref: ~p, body: ~p", [Ref, Body]),
     {stop, normal, State}.
 
--spec handle_message_frame(tuple(), undefined | pid(), #state{}) ->
+-spec handle_message_frame(tuple(), #state{}) ->
     {noreply, #state{}}.
-handle_message_frame({data, #{route_key := RouteKey, metric := Metric}}, HostPid, State) when is_pid(HostPid) ->
+handle_message_frame({data, #{route_key := RouteKey, metric := Metric}}, State = #state{host_pid = HostPid}) when is_pid(HostPid) ->
     iot_host:handle(HostPid, {data, RouteKey, Metric}),
     {noreply, State};
-handle_message_frame({task_event, Event}, HostPid, State) when is_pid(HostPid) ->
+handle_message_frame({task_event, Event}, State = #state{host_pid = HostPid}) when is_pid(HostPid) ->
     handle_event_stream_frame(Event),
     {noreply, State};
-handle_message_frame(Body, _HostPid, State) ->
+handle_message_frame(Body, State) ->
     logger:warning("[ssl_channel] unsupported message body: ~p", [Body]),
     {noreply, State}.
 
@@ -217,9 +215,9 @@ handle_event_stream_frame(#{task_id := TaskId, type := Type, stream := Stream})
     logger:debug("[ssl_channel] get task_id: ~p, type: ~ts, stream: ~ts", [TaskId, Type, Stream]),
     iot_event_stream_observer:stream_data(TaskId, Type, Stream).
 
--spec handle_command_response_frame(reference(), tuple(), map(), #state{}) ->
+-spec handle_command_response_frame(reference(), tuple(), #state{}) ->
     {noreply, #state{}}.
-handle_command_response_frame(Ref, Reply, Inflight, State) when is_reference(Ref) ->
+handle_command_response_frame(Ref, Reply, State = #state{inflight = Inflight}) when is_reference(Ref) ->
     case maps:take(Ref, Inflight) of
         error ->
             {noreply, State};
@@ -228,7 +226,7 @@ handle_command_response_frame(Ref, Reply, Inflight, State) when is_reference(Ref
             deliver_command_response(ReceiverPid, Ref, Reply),
             {noreply, State#state{inflight = NInflight}}
     end;
-handle_command_response_frame(Ref, Reply, _Inflight, State) ->
+handle_command_response_frame(Ref, Reply, State) ->
     logger:warning("[ws_channel] unexpected command_response frame, ref: ~p, reply: ~p", [Ref, Reply]),
     {noreply, State}.