diff --git a/apps/endpoint/src/endpoint_buffer.erl b/apps/endpoint/src/endpoint_buffer.erl
index 1a7b3a1..3ccc24b 100644
--- a/apps/endpoint/src/endpoint_buffer.erl
+++ b/apps/endpoint/src/endpoint_buffer.erl
@@ -18,12 +18,12 @@
 -export_type([buffer/0]).
 
 -record(buffer, {
-    endpoint,
+    endpoint :: #endpoint{},
     next_id = 1 :: integer(),
     %% 当前数据所在的游标
     cursor = 0 :: integer(),
     %% ets存储的引用
-    tid :: reference(),
+    tid :: ets:tid(),
     %% 定时器
     timer_pid :: pid(),
     %% 窗口大小，允许最大的未确认消息数
@@ -49,7 +49,7 @@ new(Endpoint = #endpoint{id = Id}, WindowSize) when is_integer(WindowSize), Wind
     EtsName = list_to_atom("endpoint_buffer_ets:" ++ integer_to_list(Id)),
     Tid = ets:new(EtsName, [ordered_set, private]),
     %% 定义重发器
-    TimerPid = endpoint_timer:start_link(?RETRY_INTERVAL),
+    {ok, TimerPid} = endpoint_timer:start_link(?RETRY_INTERVAL),
 
     #buffer{cursor = 0, tid = Tid, timer_pid = TimerPid, endpoint = Endpoint, window_size = WindowSize}.
 
diff --git a/apps/endpoint/src/endpoint_http.erl b/apps/endpoint/src/endpoint_http.erl
index c71740c..8da36da 100644
--- a/apps/endpoint/src/endpoint_http.erl
+++ b/apps/endpoint/src/endpoint_http.erl
@@ -30,7 +30,7 @@
 %%%===================================================================
 
 %% @doc Spawns the server and registers the local name (unique)
--spec(start_link(Name :: atom(), Endpoint :: #http_endpoint{}) ->
+-spec(start_link(Name :: atom(), Endpoint :: #endpoint{}) ->
     {ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
 start_link(Name, Endpoint = #endpoint{config = #http_endpoint{}}) when is_atom(Name) ->
     gen_server:start_link({local, Name}, ?MODULE, [Endpoint], []).
@@ -82,7 +82,7 @@ handle_cast(cleanup, State = #state{buffer = Buffer}) ->
     {noreply, NewState :: #state{}} |
     {noreply, NewState :: #state{}, timeout() | hibernate} |
     {stop, Reason :: term(), NewState :: #state{}}).
-handle_info({next_data, Id, _LocationCode, Body}, State = #state{buffer = Buffer, endpoint = #http_endpoint{url = Url}}) ->
+handle_info({next_data, Id, _LocationCode, Body}, State = #state{buffer = Buffer, endpoint = #endpoint{config = #http_endpoint{url = Url}}}) ->
     Headers = [
         {<<"content-type">>, <<"application/json">>}
     ],
@@ -91,7 +91,7 @@ handle_info({next_data, Id, _LocationCode, Body}, State = #state{buffer = Buffer
             {ok, RespBody} = hackney:body(ClientRef),
             hackney:close(ClientRef),
             lager:debug("[http_postman] url: ~p, response is: ~p", [Url, RespBody]),
-            NBuffer = endpoint_buffer:ack(Buffer, Id),
+            NBuffer = endpoint_buffer:ack(Id, Buffer),
 
             {noreply, State#state{buffer = NBuffer}};
         {ok, HttpCode, _, ClientRef} ->
diff --git a/apps/endpoint/src/endpoint_sup.erl b/apps/endpoint/src/endpoint_sup.erl
index 09df645..2bf517e 100644
--- a/apps/endpoint/src/endpoint_sup.erl
+++ b/apps/endpoint/src/endpoint_sup.erl
@@ -9,7 +9,7 @@
 -include("endpoint.hrl").
 
 -export([start_link/0]).
--export([ensured_endpoint_started/1, delete_endpoint/1, stat/0]).
+-export([ensured_endpoint_started/1, delete_endpoint/1]).
 
 -export([init/1]).
 
@@ -45,13 +45,6 @@ ensured_endpoint_started(Endpoint = #endpoint{}) ->
             {error, Error}
     end.
 
-stat() ->
-    Children = supervisor:which_children(?MODULE),
-    lists:foreach(fun({Id, Pid, _, _}) ->
-        Stat = catch endpoint:get_stat(Pid),
-        lager:debug("[iot_endpoint] id: ~p, stat: ~p", [Id, Stat])
-                  end, Children).
-
 delete_endpoint(Id) when is_integer(Id) ->
     Name = endpoint:get_name(Id),
     supervisor:terminate_child(?MODULE, Name),