diff --git a/apps/emqx_connector/src/emqx_connector.erl b/apps/emqx_connector/src/emqx_connector.erl
index 4e7b7d72e..16684466f 100644
--- a/apps/emqx_connector/src/emqx_connector.erl
+++ b/apps/emqx_connector/src/emqx_connector.erl
@@ -69,20 +69,29 @@ parse_connector_id(ConnectorId) ->
     end.
 
 list_raw() ->
-    lists:foldl(fun({Type, NameAndConf}, Connectors) ->
-            lists:foldl(fun({Name, RawConf}, Acc) ->
-                   [RawConf#{<<"type">> => Type, <<"name">> => Name} | Acc]
-                end, Connectors, maps:to_list(NameAndConf))
-        end, [], maps:to_list(emqx:get_raw_config(config_key_path(), #{}))).
+    case get_raw_connector_conf() of
+        not_found -> [];
+        Config ->
+            lists:foldl(fun({Type, NameAndConf}, Connectors) ->
+                lists:foldl(fun({Name, RawConf}, Acc) ->
+                        [RawConf#{<<"type">> => Type, <<"name">> => Name} | Acc]
+                    end, Connectors, maps:to_list(NameAndConf))
+            end, [], maps:to_list(Config))
+    end.
 
 lookup_raw(Id) when is_binary(Id) ->
     {Type, Name} = parse_connector_id(Id),
     lookup_raw(Type, Name).
 
 lookup_raw(Type, Name) ->
-    case emqx:get_raw_config(config_key_path() ++ [Type, Name], not_found) of
+    Path = [bin(P) || P <- [Type, Name]],
+    case get_raw_connector_conf() of
         not_found -> {error, not_found};
-        Conf -> {ok, Conf#{<<"type">> => Type, <<"name">> => Name}}
+        Conf ->
+            case emqx_map_lib:deep_get(Path, Conf, not_found) of
+                not_found -> {error, not_found};
+                Conf1 -> {ok, Conf1#{<<"type">> => Type, <<"name">> => Name}}
+            end
     end.
 
 create_dry_run(Type, Conf) ->
@@ -102,6 +111,15 @@ delete(Id) when is_binary(Id) ->
 delete(Type, Name) ->
     emqx_conf:remove(config_key_path() ++ [Type, Name], #{override_to => cluster}).
 
+get_raw_connector_conf() ->
+    case emqx:get_raw_config(config_key_path(), not_found) of
+        not_found -> not_found;
+        RawConf ->
+            #{<<"connectors">> := Conf} =
+                emqx_config:fill_defaults(#{<<"connectors">> => RawConf}),
+            Conf
+    end.
+
 bin(Bin) when is_binary(Bin) -> Bin;
 bin(Str) when is_list(Str) -> list_to_binary(Str);
 bin(Atom) when is_atom(Atom) -> atom_to_binary(Atom, utf8).
diff --git a/apps/emqx_connector/src/mqtt/emqx_connector_mqtt_schema.erl b/apps/emqx_connector/src/mqtt/emqx_connector_mqtt_schema.erl
index 7fb657ee6..0695eab2b 100644
--- a/apps/emqx_connector/src/mqtt/emqx_connector_mqtt_schema.erl
+++ b/apps/emqx_connector/src/mqtt/emqx_connector_mqtt_schema.erl
@@ -62,7 +62,10 @@ topic filters for 'remote_topic' of ingress connections.
            #{ default => "127.0.0.1:1883"
             , desc => "The host and port of the remote MQTT broker"
             })}
-    , {reconnect_interval, mk_duration("Reconnect interval", #{default => "15s"})}
+    , {reconnect_interval, mk_duration(
+        "Reconnect interval. Delay for the MQTT bridge to retry establishing the connection "
+        "in case of transportation failure.",
+        #{default => "15s"})}
     , {proto_ver,
         sc(hoconsc:enum([v3, v4, v5]),
            #{ default => v4
@@ -83,8 +86,11 @@ topic filters for 'remote_topic' of ingress connections.
            #{ default => true
             , desc => "The clean-start or the clean-session of the MQTT protocol"
             })}
-    , {keepalive, mk_duration("Keepalive", #{default => "300s"})}
-    , {retry_interval, mk_duration("Retry interval", #{default => "15s"})}
+    , {keepalive, mk_duration("MQTT Keepalive.", #{default => "300s"})}
+    , {retry_interval, mk_duration(
+        "Message retry interval. Delay for the MQTT bridge to retry sending the QoS1/QoS2 "
+        "messages in case of ACK not received.",
+        #{default => "15s"})}
     , {max_inflight,
         sc(integer(),
            #{ default => 32