diff --git a/CHANGES-4.3.md b/CHANGES-4.3.md
index ac9a11a0d..c6bb1b34d 100644
--- a/CHANGES-4.3.md
+++ b/CHANGES-4.3.md
@@ -20,6 +20,8 @@ File format:
 - Fixed crash when shared persistent subscription [#8441]
 - Fixed issue in Lua hook that prevented messages from being
   rejected [#8535]
+- Fix ExProto UDP client keepalive checking error.
+  This causes the clients to not expire as long as a new UDP packet arrives [#8575]
 
 ### Enhancements
 - HTTP API(GET /rules/) support for pagination and fuzzy filtering. [#8450]
diff --git a/apps/emqx_exproto/src/emqx_exproto.app.src b/apps/emqx_exproto/src/emqx_exproto.app.src
index 41c19f752..76bc9fa85 100644
--- a/apps/emqx_exproto/src/emqx_exproto.app.src
+++ b/apps/emqx_exproto/src/emqx_exproto.app.src
@@ -1,6 +1,6 @@
 {application, emqx_exproto,
  [{description, "EMQ X Extension for Protocol"},
-  {vsn, "4.3.8"}, %% 4.3.3 is used by ee
+  {vsn, "4.3.9"}, %% 4.3.3 is used by ee
   {modules, []},
   {registered, []},
   {mod, {emqx_exproto_app, []}},
diff --git a/apps/emqx_exproto/src/emqx_exproto.appup.src b/apps/emqx_exproto/src/emqx_exproto.appup.src
index 33bd4386c..d6406b239 100644
--- a/apps/emqx_exproto/src/emqx_exproto.appup.src
+++ b/apps/emqx_exproto/src/emqx_exproto.appup.src
@@ -1,9 +1,7 @@
 %% -*- mode: erlang -*-
 %% Unless you know what you are doing, DO NOT edit manually!!
 {VSN,
-  [{<<"4\\.3\\.[6-7]">>,
-    [{load_module,emqx_exproto_channel,brutal_purge,soft_purge,[]}]},
-   {<<"4\\.3\\.[2-5]">>,
+  [{<<"4\\.3\\.[2-8]">>,
     [{load_module,emqx_exproto_conn,brutal_purge,soft_purge,[]},
      {load_module,emqx_exproto_channel,brutal_purge,soft_purge,[]}]},
    {<<"4\\.3\\.[0-1]">>,
@@ -12,9 +10,7 @@
      {load_module,emqx_exproto_conn,brutal_purge,soft_purge,[]},
      {load_module,emqx_exproto_channel,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}],
-  [{<<"4\\.3\\.[6-7]">>,
-    [{load_module,emqx_exproto_channel,brutal_purge,soft_purge,[]}]},
-   {<<"4\\.3\\.[2-5]">>,
+  [{<<"4\\.3\\.[2-8]">>,
     [{load_module,emqx_exproto_conn,brutal_purge,soft_purge,[]},
      {load_module,emqx_exproto_channel,brutal_purge,soft_purge,[]}]},
    {<<"4\\.3\\.[0-1]">>,
diff --git a/apps/emqx_exproto/src/emqx_exproto_channel.erl b/apps/emqx_exproto/src/emqx_exproto_channel.erl
index dce3b36e1..80e5f4045 100644
--- a/apps/emqx_exproto/src/emqx_exproto_channel.erl
+++ b/apps/emqx_exproto/src/emqx_exproto_channel.erl
@@ -260,7 +260,8 @@ handle_timeout(_TRef, {keepalive, StatVal},
             {ok, reset_timer(alive_timer, NChannel)};
         {error, timeout} ->
             Req = #{type => 'KEEPALIVE'},
-            {ok, try_dispatch(on_timer_timeout, wrap(Req), Channel)}
+            NChannel = clean_timer(alive_timer, Channel),
+            {ok, try_dispatch(on_timer_timeout, wrap(Req), NChannel)}
     end;
 
 handle_timeout(_TRef, force_close, Channel = #channel{closed_reason = Reason}) ->
@@ -327,7 +328,7 @@ handle_call({start_timer, keepalive, Interval},
     NConnInfo = ConnInfo#{keepalive => Interval},
     NClientInfo = ClientInfo#{keepalive => Interval},
     NChannel = Channel#channel{conninfo = NConnInfo, clientinfo = NClientInfo},
-    {reply, ok, ensure_keepalive(NChannel)};
+    {reply, ok, [{event, updated}], ensure_keepalive(NChannel)};
 
 handle_call({subscribe, TopicFilter, Qos},
             Channel = #channel{
@@ -339,13 +340,13 @@ handle_call({subscribe, TopicFilter, Qos},
             {reply, {error, ?RESP_PERMISSION_DENY, <<"ACL deny">>}, Channel};
         _ ->
             {ok, NChannel} = do_subscribe([{TopicFilter, #{qos => Qos}}], Channel),
-            {reply, ok, NChannel}
+            {reply, ok, [{event, updated}], NChannel}
     end;
 
 handle_call({unsubscribe, TopicFilter},
             Channel = #channel{conn_state = connected}) ->
     {ok, NChannel} = do_unsubscribe([{TopicFilter, #{}}], Channel),
-    {reply, ok, NChannel};
+    {reply, ok, [{event, updated}], NChannel};
 
 handle_call({publish, Topic, Qos, Payload},
             Channel = #channel{
diff --git a/apps/emqx_exproto/src/emqx_exproto_conn.erl b/apps/emqx_exproto/src/emqx_exproto_conn.erl
index 0e83e96c4..152c0edf1 100644
--- a/apps/emqx_exproto/src/emqx_exproto_conn.erl
+++ b/apps/emqx_exproto/src/emqx_exproto_conn.erl
@@ -211,16 +211,35 @@ esockd_setopts({esockd_transport, Socket}, Opts) ->
     %% FIXME: DTLS works??
     esockd_transport:setopts(Socket, Opts).
 
-esockd_getstat({udp, _SockPid, Sock}, Stats) ->
-    inet:getstat(Sock, Stats);
 esockd_getstat({esockd_transport, Sock}, Stats) ->
-    esockd_transport:getstat(Sock, Stats).
+    esockd_transport:getstat(Sock, Stats);
+esockd_getstat({udp, _SockPid, _Sock}, Stats) ->
+    {ok, lists:map(fun(K) -> {K, get_stats(K)} end, Stats)}.
 
-send(Data, #state{socket = {udp, _SockPid, Sock}, peername = {Ip, Port}}) ->
+send(Data, State = #state{socket = {udp, _SockPid, Sock}, peername = {Ip, Port}}) ->
+    incr_send_stats(Data, State),
     gen_udp:send(Sock, Ip, Port, Data);
 send(Data, #state{socket = {esockd_transport, Sock}}) ->
     esockd_transport:async_send(Sock, Data).
 
+incr_recv_stats(Data, #state{socket = {udp, _, _}}) ->
+    incr_stats(recv_oct, byte_size(Data)),
+    incr_stats(recv_cnt, 1).
+
+incr_send_stats(Data, #state{socket = {udp, _, _}}) ->
+    incr_stats(send_oct, byte_size(Data)),
+    incr_stats(send_cnt, 1).
+
+incr_stats(Key, Cnt) ->
+    Cnt0 = get_stats(Key),
+    put({stats, Key}, Cnt0 + Cnt).
+
+get_stats(Key) ->
+    case get({stats, Key}) of
+        undefined -> 0;
+        Cnt -> Cnt
+    end.
+
 %%--------------------------------------------------------------------
 %% callbacks
 %%--------------------------------------------------------------------
@@ -386,6 +405,7 @@ handle_msg({'$gen_cast', Req}, State) ->
     with_channel(handle_cast, [Req], State);
 
 handle_msg({datagram, _SockPid, Data}, State) ->
+    incr_recv_stats(Data, State),
     process_incoming(Data, State);
 
 handle_msg({Inet, _Sock, Data}, State) when Inet == tcp; Inet == ssl ->
@@ -450,11 +470,11 @@ handle_msg({event, disconnected}, State = #state{channel = Channel}) ->
     emqx_cm:connection_closed(ClientId),
     {ok, State};
 
-%handle_msg({event, _Other}, State = #state{channel = Channel}) ->
-%    ClientId = emqx_exproto_channel:info(clientid, Channel),
-%    emqx_cm:set_chan_info(ClientId, info(State)),
-%    emqx_cm:set_chan_stats(ClientId, stats(State)),
-%    {ok, State};
+handle_msg({event, _Other}, State = #state{channel = Channel}) ->
+    ClientId = emqx_exproto_channel:info(clientid, Channel),
+    emqx_cm:set_chan_info(ClientId, info(State)),
+    emqx_cm:set_chan_stats(ClientId, stats(State)),
+    {ok, State};
 
 handle_msg({timeout, TRef, TMsg}, State) ->
     handle_timeout(TRef, TMsg, State);