correct mqtt response msg when not rebooting

hi3518/main.cc

@@ -787,12 +787,14 @@ void handle_mqtt_req(MqttHelper *hlp, const void * const data, int len, string t
         /// implementation of cmds
         if(cmd == consts::kMsgCmdConfig) {
             bool needReboot = false;
-            // verify configuration
+            
+            // if request 'data' is empty, it is getting the config, just return current config saved in gJsonConfig
             if(data.size() == 0) {
                 MqttMgr::report_response_args(gMqttClient, consts::pub_topic_response + rid, 0, "OK", cmd, rid, gJsonConfig);
                 rlogger->info("local config sent");
                 return;
             }
+            // verify configuration
             auto rv = verify_config(data);
             if(!rv.empty()) {
                 rlogger->error("failed to apply config: {}, {}", rv, data.to_string());
@@ -806,7 +808,8 @@ void handle_mqtt_req(MqttHelper *hlp, const void * const data, int len, string t
                 }
                 else {
                     // apply diff to tmp and verify
-                    rlogger->info("json diff: {}", patch.to_string());
+                    rlogger->info("config json diff: {}", patch.to_string());
+                    // if mqtt server, file upload server, video gateway url, or detection region is changed, we need to reboot camera
                     auto strP = patch.to_string();
                     if(strP.find("mqtt") != string::npos || strP.find("upload") != string::npos || strP.find("vgw") != string::npos || strP.find("region") != string::npos) {
                         needReboot = true;
@@ -822,12 +825,15 @@ void handle_mqtt_req(MqttHelper *hlp, const void * const data, int len, string t
                         MqttMgr::report_response_args(gMqttClient, consts::pub_topic_response + rid, EV_MSG_ERROR_INVALID_PARAM, rc, cmd, rid, data);
                     }
                     else {
-                        MqttMgr::report_response_args(gMqttClient, consts::pub_topic_response + rid, 0, "rebooting to apply new config", cmd, rid, data);
                         /// TODO: using json diff to apply change without reboot
                         save_configuration(data);
                         if(needReboot) {
+                            MqttMgr::report_response_args(gMqttClient, consts::pub_topic_response + rid, 0, "rebooting to apply new config", cmd, rid, data);
                             rlogger->info("rebooting to apply new configuration");
                             LibXmMaQue_System_reboot();
+                        } else {
+                            MqttMgr::report_response_args(gMqttClient, consts::pub_topic_response + rid, 0, "config change apply without reboot", cmd, rid, patch);
+                            
                         }
                     }
                 }