diff --git a/apps/efka/src/efka_agent.erl b/apps/efka/src/efka_agent.erl
index 9732b78..66d2b1f 100644
--- a/apps/efka/src/efka_agent.erl
+++ b/apps/efka/src/efka_agent.erl
@@ -107,6 +107,7 @@ handle_event({call, From}, {request_service_config, ReceiverPid, ServiceId}, ?ST
 handle_event({call, From}, {request_service_config, _ReceiverPid, _ServiceId}, _, State) ->
     {keep_state, State, [{reply, From, {error, <<"transport is not alive">>}}]};
 
+%% 异步发送数据, 连接存在时候直接发送；否则缓存到mnesia
 handle_event(cast, {metric_data, ServiceId, DeviceUUID, LineProtocolData}, ?STATE_ACTIVATED, State = #state{transport_pid = TransportPid}) ->
     Packet = message_pb:encode_msg(#data{
         service_id = ServiceId,
@@ -115,6 +116,7 @@ handle_event(cast, {metric_data, ServiceId, DeviceUUID, LineProtocolData}, ?STAT
     }),
     efka_transport:send(TransportPid, ?METHOD_DATA, Packet),
     {keep_state, State};
+
 handle_event(cast, {metric_data, ServiceId, DeviceUUID, LineProtocolData}, _, State) ->
     Packet = message_pb:encode_msg(#data{
         service_id = ServiceId,
@@ -124,6 +126,7 @@ handle_event(cast, {metric_data, ServiceId, DeviceUUID, LineProtocolData}, _, St
     ok = cache_model:insert(?METHOD_DATA, Packet),
     {keep_state, State};
 
+%% 异步发送事件
 handle_event(cast, {event, ServiceId, EventType, Params}, ?STATE_ACTIVATED, State = #state{transport_pid = TransportPid}) ->
     EventPacket = message_pb:encode_msg(#event{
         service_id = ServiceId,
@@ -162,6 +165,7 @@ handle_event(cast, {ping, AdCode, BootTime, Province, City, EfkaVersion, KernelA
     efka_transport:send(TransportPid, ?METHOD_PING, Ping),
     {keep_state, State};
 
+%% 异步建立到服务器的连接
 handle_event(info, {timeout, _, create_transport}, ?STATE_DENIED, State) ->
     {ok, Props} = application:get_env(efka, tls_server),
     Host = proplists:get_value(host, Props),
@@ -180,7 +184,7 @@ handle_event(info, {connect_reply, Reply}, ?STATE_CONNECTING, State = #state{tra
         {error, Reason} ->
             lager:debug("[efka_agent] connect failed, error: ~p, pid: ~p", [Reason, TransportPid]),
             efka_transport:stop(TransportPid),
-            {next_state, ?STATE_DENIED, State}
+            {next_state, ?STATE_DENIED, State#state{transport_pid = undefined}}
     end;
 
 handle_event(info, {auth_reply, Reply}, ?STATE_AUTH, State = #state{transport_pid = TransportPid}) ->
@@ -190,13 +194,7 @@ handle_event(info, {auth_reply, Reply}, ?STATE_AUTH, State = #state{transport_pi
             case Code of
                 0 ->
                     lager:debug("[efka_agent] auth success, message: ~p", [Message]),
-                    %% 上传缓冲区里面的所有数据
-                    CacheItems = cache_model:get_all_cache(),
-                    lists:foreach(fun(#cache{id = Id, method = Method, data = Packet}) ->
-                        efka_transport:send(TransportPid, Method, Packet),
-                        cache_model:delete(Id)
-                                  end, CacheItems),
-                    {next_state, ?STATE_ACTIVATED, State};
+                    {next_state, ?STATE_ACTIVATED, State, [{next_event, info, flush_cache}]};
                 1 ->
                     %% 主机在后台的授权未通过；此时agent不能推送数据给云端服务器，但是云端服务器可以推送命令给agent
                     %% socket的连接状态需要维持
@@ -219,6 +217,19 @@ handle_event(info, {auth_reply, Reply}, ?STATE_AUTH, State = #state{transport_pi
             {next_state, ?STATE_DENIED, State#state{transport_pid = undefined}}
     end;
 
+%% 将缓存中的数据推送到服务器端
+handle_event(info, flush_cache, ?STATE_ACTIVATED, State = #state{transport_pid = TransportPid}) ->
+    case cache_model:fetch_next() of
+        {ok, #cache{id = Id, method = Method, data = Packet}} ->
+            efka_transport:send(TransportPid, Method, Packet),
+            cache_model:delete(Id),
+            {keep_state, State, [{next_event, info, flush_cache}]};
+        error ->
+            {keep_state, State}
+    end;
+handle_event(info, flush_cache, _, State) ->
+    {keep_state, State};
+
 %% 云端服务器推送了消息
 %% 激活消息
 
diff --git a/apps/efka/src/mnesia/cache_model.erl b/apps/efka/src/mnesia/cache_model.erl
index 0718b2e..28fb6f1 100644
--- a/apps/efka/src/mnesia/cache_model.erl
+++ b/apps/efka/src/mnesia/cache_model.erl
@@ -16,6 +16,7 @@
 %% API
 -export([create_table/0]).
 -export([insert/2, get_all_cache/0, fetch_next/0, delete/1, next_id/0]).
+-export([first_key/0]).
 
 create_table() ->
     %% id生成器
@@ -62,10 +63,12 @@ get_all_cache() ->
         Q = qlc:q([E || E <- mnesia:table(?TAB)]),
         qlc:e(Q)
           end,
-
     case mnesia:transaction(Fun) of
         {'atomic', Res} ->
             Res;
         {'aborted', _} ->
             []
-    end.
\ No newline at end of file
+    end.
+
+first_key() ->
+    mnesia:dirty_first(?TAB).