diff --git a/lib-ce/emqx_telemetry/src/emqx_telemetry.app.src b/lib-ce/emqx_telemetry/src/emqx_telemetry.app.src
index 52bfe7b10..27852ba7b 100644
--- a/lib-ce/emqx_telemetry/src/emqx_telemetry.app.src
+++ b/lib-ce/emqx_telemetry/src/emqx_telemetry.app.src
@@ -1,6 +1,6 @@
 {application, emqx_telemetry,
  [{description, "EMQ X Telemetry"},
-  {vsn, "4.3.4"}, % strict semver, bump manually!
+  {vsn, "4.3.5"}, % strict semver, bump manually!
   {modules, []},
   {registered, [emqx_telemetry_sup]},
   {applications, [kernel,stdlib]},
diff --git a/lib-ce/emqx_telemetry/src/emqx_telemetry.appup.src b/lib-ce/emqx_telemetry/src/emqx_telemetry.appup.src
index 3d079e839..3e5d0bcdf 100644
--- a/lib-ce/emqx_telemetry/src/emqx_telemetry.appup.src
+++ b/lib-ce/emqx_telemetry/src/emqx_telemetry.appup.src
@@ -1,11 +1,9 @@
 %% -*- mode: erlang -*-
 %% Unless you know what you are doing, DO NOT edit manually!!
 {VSN,
-  [{"4.3.3",[{load_module,emqx_telemetry,brutal_purge,soft_purge,[]}]},
-   {<<"4\\.3\\.[0-2]">>,
+  [{<<"4\\.3\\.[0-4]">>,
     [{load_module,emqx_telemetry,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}],
-  [{"4.3.3",[{load_module,emqx_telemetry,brutal_purge,soft_purge,[]}]},
-   {<<"4\\.3\\.[0-2]">>,
+  [{<<"4\\.3\\.[0-4]">>,
     [{load_module,emqx_telemetry,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}]}.
diff --git a/lib-ce/emqx_telemetry/src/emqx_telemetry.erl b/lib-ce/emqx_telemetry/src/emqx_telemetry.erl
index 9935d5005..aa8acaab7 100644
--- a/lib-ce/emqx_telemetry/src/emqx_telemetry.erl
+++ b/lib-ce/emqx_telemetry/src/emqx_telemetry.erl
@@ -75,7 +75,7 @@
 
           enabled :: undefined | boolean(),
 
-          url :: string(),
+          url :: undefined | string(),
 
           report_interval :: undefined | non_neg_integer(),
 
@@ -90,6 +90,8 @@
 
 -define(TELEMETRY, emqx_telemetry).
 
+-define(HTTP_TIMEOUT, 10).
+
 %%--------------------------------------------------------------------
 %% Mnesia bootstrap
 %%--------------------------------------------------------------------
@@ -115,19 +117,19 @@ stop() ->
     gen_server:stop(?MODULE).
 
 enable() ->
-    gen_server:call(?MODULE, enable).
+    gen_server:call(?MODULE, enable, infinity).
 
 disable() ->
-    gen_server:call(?MODULE, disable).
+    gen_server:call(?MODULE, disable, infinity).
 
 is_enabled() ->
-    gen_server:call(?MODULE, is_enabled).
+    gen_server:call(?MODULE, is_enabled, infinity).
 
 get_uuid() ->
-    gen_server:call(?MODULE, get_uuid).
+    gen_server:call(?MODULE, get_uuid, infinity).
 
 get_telemetry() ->
-    gen_server:call(?MODULE, get_telemetry).
+    gen_server:call(?MODULE, get_telemetry, infinity).
 
 %%--------------------------------------------------------------------
 %% gen_server callbacks
@@ -353,15 +355,18 @@ report_telemetry(State = #state{url = URL}) ->
     Data = get_telemetry(State),
     case emqx_json:safe_encode(Data) of
         {ok, Bin} ->
-            httpc_request(post, URL, [], Bin),
+            _ = httpc_request(post, URL, [], Bin),
             ?tp(debug, telemetry_data_reported, #{});
         {error, Reason} ->
             %% debug? why?
             ?tp(debug, telemetry_data_encode_error, #{data => Data, reason => Reason})
     end.
 
+%% we might set url = undefined in testcase
+httpc_request(_, undefined, _, _) ->
+    ignore;
 httpc_request(Method, URL, Headers, Body) ->
-    HTTPOptions = [{timeout, timer:seconds(10)}, {ssl, [{verify, verify_none}]}],
+    HTTPOptions = [{timeout, timer:seconds(?HTTP_TIMEOUT)}, {ssl, [{verify, verify_none}]}],
     Options = [],
     httpc:request(Method, {URL, Headers, "application/json", Body}, HTTPOptions, Options).
 
diff --git a/lib-ce/emqx_telemetry/test/emqx_telemetry_SUITE.erl b/lib-ce/emqx_telemetry/test/emqx_telemetry_SUITE.erl
index ec9a764ff..d018ad3e9 100644
--- a/lib-ce/emqx_telemetry/test/emqx_telemetry_SUITE.erl
+++ b/lib-ce/emqx_telemetry/test/emqx_telemetry_SUITE.erl
@@ -42,7 +42,7 @@ t_uuid(_) ->
     {ok, UUID2} = emqx_telemetry:get_uuid(),
     emqx_telemetry:stop(),
     emqx_telemetry:start_link([{enabled, true},
-                               {url, "https://telemetry.emqx.io/api/telemetry"},
+                               {url, undefined},
                                {report_interval, 7 * 24 * 60 * 60}]),
     {ok, UUID3} = emqx_telemetry:get_uuid(),
     ?assertEqual(UUID2, UUID3).
@@ -80,7 +80,7 @@ t_send_after_enable(_) ->
     ok = snabbkaffe:start_trace(),
     try
         ok = emqx_telemetry:enable(),
-        ?assertMatch({ok, _}, ?block_until(#{?snk_kind := telemetry_data_reported}, 2000, 100))
+        ?assertMatch({ok, _}, ?block_until(#{?snk_kind := telemetry_data_reported}, 15000, 100))
     after
         ok = snabbkaffe:stop()
     end.