[SYS] Introduce MQTT Broker mode (#1988)

main/ZwebUI.ino

@@ -706,6 +706,7 @@ void handleMQ() {
       JsonObject WEBtoSYS = WEBtoSYSBuffer.to<JsonObject>();
       bool update = false;
 
+#  if !MQTT_BROKER_MODE
       if (server.hasArg("mh")) {
         WEBtoSYS["mqtt_server"] = server.arg("mh");
         if (strncmp(cnt_parameters_array[CNT_DEFAULT_INDEX].mqtt_server, server.arg("mh").c_str(), parameters_size)) {
@@ -746,6 +747,7 @@ void handleMQ() {
           WEBtoSYS.remove(it);
         }
       }
+#  endif
 
       if (server.hasArg("h")) {
         WEBtoSYS["gateway_name"] = server.arg("h");
@@ -802,7 +804,11 @@ void handleMQ() {
   response += String(script);
   response += String(style);
   // mqtt server (mh), mqtt port (ml), mqtt username (mu), mqtt password (mp), secure connection (sc), server certificate (msc), topic (mt)
+#  if MQTT_BROKER_MODE
+  snprintf(buffer, WEB_TEMPLATE_BUFFER_MAX_SIZE, config_mqtt_body, jsonChar, gateway_name, "", "1883", "", "", gateway_name, mqtt_topic);
+#  else
   snprintf(buffer, WEB_TEMPLATE_BUFFER_MAX_SIZE, config_mqtt_body, jsonChar, gateway_name, cnt_parameters_array[CNT_DEFAULT_INDEX].mqtt_server, cnt_parameters_array[CNT_DEFAULT_INDEX].mqtt_port, cnt_parameters_array[CNT_DEFAULT_INDEX].mqtt_user, (cnt_parameters_array[CNT_DEFAULT_INDEX].isConnectionSecure ? "checked" : ""), gateway_name, mqtt_topic);
+#  endif
   response += String(buffer);
   snprintf(buffer, WEB_TEMPLATE_BUFFER_MAX_SIZE, footer, OMG_VERSION);
   response += String(buffer);
@@ -2503,4 +2509,4 @@ void addLog(const uint8_t* buffer, size_t size) {
   }
 }
 
-#endif
+#endif