fix: change default hearbeat interval to 160s for mqtt connector

apps/emqx_bridge_mqtt/src/emqx_bridge_mqtt.app.src

@@ -1,7 +1,7 @@
 %% -*- mode: erlang -*-
 {application, emqx_bridge_mqtt, [
     {description, "EMQX MQTT Broker Bridge"},
-    {vsn, "0.2.4"},
+    {vsn, "0.2.5"},
     {registered, []},
     {applications, [
         kernel,

apps/emqx_bridge_mqtt/src/emqx_bridge_mqtt_connector_schema.erl

@@ -127,7 +127,7 @@ fields("server_configs") ->
                     desc => ?DESC("clean_start")
                 }
             )},
-        {keepalive, mk_duration("MQTT Keepalive.", #{default => <<"300s">>})},
+        {keepalive, mk_duration("MQTT Keepalive.", #{default => <<"160s">>})},
         {retry_interval,
             mk_duration(
                 "Message retry interval. Delay for the MQTT bridge to retry sending the QoS1/QoS2 "