diff --git a/sonoff/_changelog.ino b/sonoff/_changelog.ino
index 68d677454..978aa861f 100644
--- a/sonoff/_changelog.ino
+++ b/sonoff/_changelog.ino
@@ -1,4 +1,7 @@
-/* 6.5.0 20190319
+/* 6.5.0.1 20190319
+ * Change Web GUI sensor data collection
+ *
+ * 6.5.0 20190319
  * Remove commands SetOption14 and SetOption63 as it has been superseded by command Interlock
  * Remove command SetOption35 0-255 for mDNS start-up delay (#4793)
  * Remove support for MQTT_LIBRARY_TYPE, MQTT_ARDUINOMQTT and MQTT_TASMOTAMQTT (#5474)
diff --git a/sonoff/i18n.h b/sonoff/i18n.h
index 73e228124..ded4ccd43 100644
--- a/sonoff/i18n.h
+++ b/sonoff/i18n.h
@@ -561,19 +561,19 @@ const char kOptionBlinkOff[] PROGMEM = "BLINKOFF|" D_BLINKOFF ;
 
 // xdrv_02_webserver.ino
 #ifdef USE_WEBSERVER
-const char HTTP_SNS_TEMP[] PROGMEM = "%s{s}%s " D_TEMPERATURE "{m}%s&deg;%c{e}";                             // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_SNS_HUM[] PROGMEM = "%s{s}%s " D_HUMIDITY "{m}%s%%{e}";                                      // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_SNS_PRESSURE[] PROGMEM = "%s{s}%s " D_PRESSURE "{m}%s %s{e}";                                // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_SNS_SEAPRESSURE[] PROGMEM = "%s{s}%s " D_PRESSUREATSEALEVEL "{m}%s %s{e}";                   // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_SNS_ANALOG[] PROGMEM = "%s{s}%s " D_ANALOG_INPUT "%d{m}%d{e}";                               // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_SNS_ILLUMINANCE[] PROGMEM = "%s{s}%s " D_ILLUMINANCE "{m}%d " D_UNIT_LUX "{e}";              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_SNS_TEMP[] PROGMEM = "{s}%s " D_TEMPERATURE "{m}%s&deg;%c{e}";                             // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_SNS_HUM[] PROGMEM = "{s}%s " D_HUMIDITY "{m}%s%%{e}";                                      // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_SNS_PRESSURE[] PROGMEM = "{s}%s " D_PRESSURE "{m}%s %s{e}";                                // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_SNS_SEAPRESSURE[] PROGMEM = "{s}%s " D_PRESSUREATSEALEVEL "{m}%s %s{e}";                   // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_SNS_ANALOG[] PROGMEM = "{s}%s " D_ANALOG_INPUT "%d{m}%d{e}";                               // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_SNS_ILLUMINANCE[] PROGMEM = "{s}%s " D_ILLUMINANCE "{m}%d " D_UNIT_LUX "{e}";              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 
 #if defined(USE_MHZ19) || defined(USE_SENSEAIR) || defined(USE_AZ7798) || defined(USE_SCD30)
-const char HTTP_SNS_CO2[] PROGMEM = "%s{s}%s " D_CO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}";                // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_SNS_CO2[] PROGMEM = "{s}%s " D_CO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}";                // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 #endif  // USE_MHZ19
 
 #if defined(USE_SCD30)
-const char HTTP_SNS_CO2EAVG[] PROGMEM = "%s{s}%s " D_ECO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}";           // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_SNS_CO2EAVG[] PROGMEM = "{s}%s " D_ECO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}";           // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 #endif  // USE_SCD30
 
 const char S_MAIN_MENU[] PROGMEM = D_MAIN_MENU;
diff --git a/sonoff/sonoff.h b/sonoff/sonoff.h
index 6c44f54fd..635a1017a 100644
--- a/sonoff/sonoff.h
+++ b/sonoff/sonoff.h
@@ -252,7 +252,7 @@ enum LightSchemes {LS_POWER, LS_WAKEUP, LS_CYCLEUP, LS_CYCLEDN, LS_RANDOM, LS_MA
 
 enum XsnsFunctions {FUNC_SETTINGS_OVERRIDE, FUNC_MODULE_INIT, FUNC_PRE_INIT, FUNC_INIT,
                     FUNC_LOOP, FUNC_EVERY_50_MSECOND, FUNC_EVERY_100_MSECOND, FUNC_EVERY_200_MSECOND, FUNC_EVERY_250_MSECOND, FUNC_EVERY_SECOND,
-                    FUNC_PREP_BEFORE_TELEPERIOD, FUNC_JSON_APPEND, FUNC_WEB_APPEND, FUNC_SAVE_BEFORE_RESTART, FUNC_COMMAND, FUNC_COMMAND_SENSOR, FUNC_COMMAND_DRIVER,
+                    FUNC_PREP_BEFORE_TELEPERIOD, FUNC_JSON_APPEND, FUNC_WEB_SENSOR, FUNC_SAVE_BEFORE_RESTART, FUNC_COMMAND, FUNC_COMMAND_SENSOR, FUNC_COMMAND_DRIVER,
                     FUNC_MQTT_SUBSCRIBE, FUNC_MQTT_INIT, FUNC_MQTT_DATA,
                     FUNC_SET_POWER, FUNC_SET_DEVICE_POWER, FUNC_SHOW_SENSOR,
                     FUNC_RULES_PROCESS, FUNC_SERIAL, FUNC_FREE_MEM, FUNC_BUTTON_PRESSED,
diff --git a/sonoff/sonoff_version.h b/sonoff/sonoff_version.h
index 0e9c322ac..7a5dac4cc 100644
--- a/sonoff/sonoff_version.h
+++ b/sonoff/sonoff_version.h
@@ -20,7 +20,7 @@
 #ifndef _SONOFF_VERSION_H_
 #define _SONOFF_VERSION_H_
 
-#define VERSION            0x06050000
+#define VERSION            0x06050001
 
 #define D_PROGRAMNAME      "Sonoff-Tasmota"
 #define D_AUTHOR           "Theo Arends"
diff --git a/sonoff/xdrv_01_webserver.ino b/sonoff/xdrv_01_webserver.ino
index 415d14e53..ec017810f 100644
--- a/sonoff/xdrv_01_webserver.ino
+++ b/sonoff/xdrv_01_webserver.ino
@@ -629,13 +629,9 @@ void WSContentFlush()
   }
 }
 
-void WSContentSend_P(const char* formatP, ...)     // Content send snprintf_P char data
+void _WSContentSendBuffer(void)
 {
-  // This uses char strings. Be aware of sending %% if % is needed
-  va_list arg;
-  va_start(arg, formatP);
-  int len = vsnprintf_P(mqtt_data, sizeof(mqtt_data), formatP, arg);
-  va_end(arg);
+  int len = strlen(mqtt_data);
 
   if (0 == len) {                                  // No content
     return;
@@ -656,6 +652,36 @@ void WSContentSend_P(const char* formatP, ...)     // Content send snprintf_P ch
   }
 }
 
+void WSContentSend_P(const char* formatP, ...)     // Content send snprintf_P char data
+{
+  // This uses char strings. Be aware of sending %% if % is needed
+  va_list arg;
+  va_start(arg, formatP);
+  vsnprintf_P(mqtt_data, sizeof(mqtt_data), formatP, arg);
+  va_end(arg);
+
+  _WSContentSendBuffer();
+}
+
+void WSContentSend_PD(const char* formatP, ...)    // Content send snprintf_P char data checked for decimal separator
+{
+  // This uses char strings. Be aware of sending %% if % is needed
+  va_list arg;
+  va_start(arg, formatP);
+  int len = vsnprintf_P(mqtt_data, sizeof(mqtt_data), formatP, arg);
+  va_end(arg);
+
+  if (D_DECIMAL_SEPARATOR[0] != '.') {
+    for (uint16_t i = 0; i < strlen(mqtt_data); i++) {
+      if ('.' == mqtt_data[i]) {
+        mqtt_data[i] = D_DECIMAL_SEPARATOR[0];
+      }
+    }
+  }
+
+  _WSContentSendBuffer();
+}
+
 void WSContentStart_P(const char* title, bool auth)
 {
   if (auth && (Settings.web_password[0] != 0) && !WebServer->authenticate(WEB_USERNAME, Settings.web_password)) {
@@ -940,20 +966,11 @@ bool HandleRootStatusRefresh(void)
     ExecuteWebCommand(svalue, SRC_WEBGUI);
   }
 
-  mqtt_data[0] = '\0';
-  XsnsCall(FUNC_WEB_APPEND);
-  if (D_DECIMAL_SEPARATOR[0] != '.') {
-    for (uint16_t i = 0; i < strlen(mqtt_data); i++) {
-      if ('.' == mqtt_data[i]) {
-        mqtt_data[i] = D_DECIMAL_SEPARATOR[0];
-      }
-    }
-  }
-  char stemp[strlen(mqtt_data) +1];
-  memcpy(stemp, mqtt_data, sizeof(stemp));
-
   WSContentBegin(200, CT_HTML);
-  WSContentSend_P(PSTR("{t}%s</table>"), stemp);
+  WSContentSend_P(PSTR("{t}"));
+  XsnsCall(FUNC_WEB_SENSOR);
+  WSContentSend_P(PSTR("</table>"));
+
   if (devices_present) {
     WSContentSend_P(PSTR("{t}<tr>"));
     uint8_t fsize = (devices_present < 5) ? 70 - (devices_present * 8) : 32;
diff --git a/sonoff/xdrv_03_energy.ino b/sonoff/xdrv_03_energy.ino
index 10814bd65..b2393a311 100644
--- a/sonoff/xdrv_03_energy.ino
+++ b/sonoff/xdrv_03_energy.ino
@@ -548,20 +548,20 @@ void EnergySnsInit(void)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_ENERGY_SNS1[] PROGMEM = "%s"
+const char HTTP_ENERGY_SNS1[] PROGMEM =
   "{s}" D_VOLTAGE "{m}%s " D_UNIT_VOLT "{e}"
   "{s}" D_CURRENT "{m}%s " D_UNIT_AMPERE "{e}"
   "{s}" D_POWERUSAGE "{m}%s " D_UNIT_WATT "{e}";
 
-const char HTTP_ENERGY_SNS2[] PROGMEM = "%s"
+const char HTTP_ENERGY_SNS2[] PROGMEM =
   "{s}" D_POWERUSAGE_APPARENT "{m}%s " D_UNIT_VA "{e}"
   "{s}" D_POWERUSAGE_REACTIVE "{m}%s " D_UNIT_VAR "{e}"
   "{s}" D_POWER_FACTOR "{m}%s{e}";
 
-const char HTTP_ENERGY_SNS3[] PROGMEM = "%s"
+const char HTTP_ENERGY_SNS3[] PROGMEM =
   "{s}" D_FREQUENCY "{m}%s " D_UNIT_HERTZ "{e}";
 
-const char HTTP_ENERGY_SNS4[] PROGMEM = "%s"
+const char HTTP_ENERGY_SNS4[] PROGMEM =
   "{s}" D_ENERGY_TODAY  "{m}%s " D_UNIT_KILOWATTHOUR "{e}"
   "{s}" D_ENERGY_YESTERDAY "{m}%s " D_UNIT_KILOWATTHOUR "{e}"
   "{s}" D_ENERGY_TOTAL "{m}%s " D_UNIT_KILOWATTHOUR "{e}";      // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
@@ -666,12 +666,12 @@ void EnergyShow(bool json)
 #endif  // USE_KNX
 #ifdef USE_WEBSERVER
   } else {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_ENERGY_SNS1, mqtt_data, voltage_chr, current_chr, active_power_chr);
+    WSContentSend_PD(HTTP_ENERGY_SNS1, voltage_chr, current_chr, active_power_chr);
     if (!energy_type_dc) {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_ENERGY_SNS2, mqtt_data, apparent_power_chr, reactive_power_chr, power_factor_chr);
-      if (!isnan(energy_frequency)) { snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_ENERGY_SNS3, mqtt_data, frequency_chr); }
+      WSContentSend_PD(HTTP_ENERGY_SNS2, apparent_power_chr, reactive_power_chr, power_factor_chr);
+      if (!isnan(energy_frequency)) { WSContentSend_PD(HTTP_ENERGY_SNS3, frequency_chr); }
     }
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_ENERGY_SNS4, mqtt_data, energy_daily_chr, energy_yesterday_chr, energy_total_chr);
+    WSContentSend_PD(HTTP_ENERGY_SNS4, energy_daily_chr, energy_yesterday_chr, energy_total_chr);
 #endif  // USE_WEBSERVER
   }
 }
@@ -722,7 +722,7 @@ bool Xsns03(uint8_t function)
         EnergyShow(true);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         EnergyShow(false);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_01_counter.ino b/sonoff/xsns_01_counter.ino
index cfa797030..901793fec 100644
--- a/sonoff/xsns_01_counter.ino
+++ b/sonoff/xsns_01_counter.ino
@@ -86,7 +86,7 @@ void CounterInit(void)
 
 #ifdef USE_WEBSERVER
 const char HTTP_SNS_COUNTER[] PROGMEM =
-  "%s{s}" D_COUNTER "%d{m}%s%s{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+  "{s}" D_COUNTER "%d{m}%s%s{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 #endif  // USE_WEBSERVER
 
 void CounterShow(bool json)
@@ -121,7 +121,7 @@ void CounterShow(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
       } else {
-        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_COUNTER, mqtt_data, i +1, counter, (bitRead(Settings.pulse_counter_type, i)) ? " " D_UNIT_SECOND : "");
+        WSContentSend_PD(HTTP_SNS_COUNTER, i +1, counter, (bitRead(Settings.pulse_counter_type, i)) ? " " D_UNIT_SECOND : "");
 #endif  // USE_WEBSERVER
       }
     }
@@ -152,7 +152,7 @@ bool Xsns01(uint8_t function)
       CounterShow(1);
       break;
 #ifdef USE_WEBSERVER
-    case FUNC_WEB_APPEND:
+    case FUNC_WEB_SENSOR:
       CounterShow(0);
       break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_02_analog.ino b/sonoff/xsns_02_analog.ino
index e75160697..79a622f0f 100644
--- a/sonoff/xsns_02_analog.ino
+++ b/sonoff/xsns_02_analog.ino
@@ -58,7 +58,7 @@ void AdcShow(bool json)
     snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"ANALOG\":{\"A0\":%d}"), mqtt_data, analog);
 #ifdef USE_WEBSERVER
   } else {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ANALOG, mqtt_data, "", 0, analog);
+    WSContentSend_PD(HTTP_SNS_ANALOG, "", 0, analog);
 #endif  // USE_WEBSERVER
   }
 }
@@ -82,7 +82,7 @@ bool Xsns02(uint8_t function)
         AdcShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         AdcShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_04_snfsc.ino b/sonoff/xsns_04_snfsc.ino
index f4880a308..98d1f6276 100644
--- a/sonoff/xsns_04_snfsc.ino
+++ b/sonoff/xsns_04_snfsc.ino
@@ -105,7 +105,7 @@ void SonoffScSerialInput(char *rcvstat)
 
 #ifdef USE_WEBSERVER
 const char HTTP_SNS_SCPLUS[] PROGMEM =
-  "%s{s}" D_LIGHT "{m}%d%%{e}{s}" D_NOISE "{m}%d%%{e}{s}" D_AIR_QUALITY "{m}%d%%{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+  "{s}" D_LIGHT "{m}%d%%{e}{s}" D_NOISE "{m}%d%%{e}{s}" D_AIR_QUALITY "{m}%d%%{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 #endif  // USE_WEBSERVER
 
 void SonoffScShow(bool json)
@@ -140,9 +140,9 @@ void SonoffScShow(bool json)
 
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, "", temperature, TempUnit());
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, "", humidity);
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_SCPLUS, mqtt_data, sc_value[2], sc_value[3], sc_value[4]);
+      WSContentSend_PD(HTTP_SNS_TEMP, "", temperature, TempUnit());
+      WSContentSend_PD(HTTP_SNS_HUM, "", humidity);
+      WSContentSend_PD(HTTP_SNS_SCPLUS, sc_value[2], sc_value[3], sc_value[4]);
 #endif  // USE_WEBSERVER
     }
   }
@@ -165,7 +165,7 @@ bool Xsns04(uint8_t function)
         SonoffScShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         SonoffScShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_05_ds18b20.ino b/sonoff/xsns_05_ds18b20.ino
index f5d4bd03d..9e82a8e9b 100644
--- a/sonoff/xsns_05_ds18b20.ino
+++ b/sonoff/xsns_05_ds18b20.ino
@@ -218,7 +218,7 @@ void Ds18b20Show(bool json)
 #endif  // USE_KNX
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, ds18b20_types, temperature, TempUnit());
+      WSContentSend_PD(HTTP_SNS_TEMP, ds18b20_types, temperature, TempUnit());
 #endif  // USE_WEBSERVER
     }
   }
@@ -241,7 +241,7 @@ bool Xsns05(uint8_t function)
         Ds18b20Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Ds18b20Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_05_ds18x20.ino b/sonoff/xsns_05_ds18x20.ino
index 521fdeaa8..e2ff0767c 100644
--- a/sonoff/xsns_05_ds18x20.ino
+++ b/sonoff/xsns_05_ds18x20.ino
@@ -452,7 +452,7 @@ void Ds18x20Show(bool json)
 #endif  // USE_KNX
 #ifdef USE_WEBSERVER
       } else {
-        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, ds18x20_types, temperature, TempUnit());
+        WSContentSend_PD(HTTP_SNS_TEMP, ds18x20_types, temperature, TempUnit());
 #endif  // USE_WEBSERVER
       }
     }
@@ -479,7 +479,7 @@ bool Xsns05(uint8_t function)
         Ds18x20Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Ds18x20Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_05_ds18x20_legacy.ino b/sonoff/xsns_05_ds18x20_legacy.ino
index cb07bf63c..2b157cfb7 100644
--- a/sonoff/xsns_05_ds18x20_legacy.ino
+++ b/sonoff/xsns_05_ds18x20_legacy.ino
@@ -198,7 +198,7 @@ void Ds18x20Show(bool json)
 #ifdef USE_WEBSERVER
       } else {
         snprintf_P(stemp, sizeof(stemp), PSTR("%s-%d"), ds18x20_types, i +1);
-        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, stemp, temperature, TempUnit());
+        WSContentSend_PD(HTTP_SNS_TEMP, stemp, temperature, TempUnit());
 #endif  // USE_WEBSERVER
       }
     }
@@ -233,7 +233,7 @@ bool Xsns05(uint8_t function)
         Ds18x20Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Ds18x20Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_06_dht.ino b/sonoff/xsns_06_dht.ino
index e6d8d7328..016f012f0 100644
--- a/sonoff/xsns_06_dht.ino
+++ b/sonoff/xsns_06_dht.ino
@@ -227,8 +227,8 @@ void DhtShow(bool json)
 #endif  // USE_KNX
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, Dht[i].stype, temperature, TempUnit());
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, Dht[i].stype, humidity);
+      WSContentSend_PD(HTTP_SNS_TEMP, Dht[i].stype, temperature, TempUnit());
+      WSContentSend_PD(HTTP_SNS_HUM, Dht[i].stype, humidity);
 #endif  // USE_WEBSERVER
     }
   }
@@ -254,7 +254,7 @@ bool Xsns06(uint8_t function)
         DhtShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         DhtShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_07_sht1x.ino b/sonoff/xsns_07_sht1x.ino
index 51351bdf5..0967560b1 100644
--- a/sonoff/xsns_07_sht1x.ino
+++ b/sonoff/xsns_07_sht1x.ino
@@ -208,8 +208,8 @@ void ShtShow(bool json)
 #endif  // USE_KNX
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, sht_types, temperature, TempUnit());
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, sht_types, humidity);
+      WSContentSend_PD(HTTP_SNS_TEMP, sht_types, temperature, TempUnit());
+      WSContentSend_PD(HTTP_SNS_HUM, sht_types, humidity);
 #endif  // USE_WEBSERVER
     }
   }
@@ -236,7 +236,7 @@ bool Xsns07(uint8_t function)
         ShtShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         ShtShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_08_htu21.ino b/sonoff/xsns_08_htu21.ino
index 8ce9657ea..1ef208d61 100644
--- a/sonoff/xsns_08_htu21.ino
+++ b/sonoff/xsns_08_htu21.ino
@@ -268,8 +268,8 @@ void HtuShow(bool json)
 #endif  // USE_KNX
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, htu_types, temperature, TempUnit());
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, htu_types, humidity);
+      WSContentSend_PD(HTTP_SNS_TEMP, htu_types, temperature, TempUnit());
+      WSContentSend_PD(HTTP_SNS_HUM, htu_types, humidity);
 #endif  // USE_WEBSERVER
     }
   }
@@ -295,7 +295,7 @@ bool Xsns08(uint8_t function)
         HtuShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         HtuShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_09_bmp.ino b/sonoff/xsns_09_bmp.ino
index 488efd7ee..22b0cd365 100755
--- a/sonoff/xsns_09_bmp.ino
+++ b/sonoff/xsns_09_bmp.ino
@@ -597,19 +597,20 @@ void BmpShow(bool json)
 
 #ifdef USE_WEBSERVER
       } else {
-        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, name, temperature, TempUnit());
+        WSContentSend_PD(HTTP_SNS_TEMP, name, temperature, TempUnit());
         if (bmp_sensors[bmp_idx].bmp_model >= 2) {
-          snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, name, humidity);
+          WSContentSend_PD(HTTP_SNS_HUM, name, humidity);
         }
-        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_PRESSURE, mqtt_data, name, pressure, PressureUnit().c_str());
+        WSContentSend_PD(HTTP_SNS_PRESSURE, name, pressure, PressureUnit().c_str());
         if (Settings.altitude != 0) {
-          snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_SEAPRESSURE, mqtt_data, name, sea_pressure, PressureUnit().c_str());
+          WSContentSend_PD(HTTP_SNS_SEAPRESSURE, name, sea_pressure, PressureUnit().c_str());
         }
 #ifdef USE_BME680
         if (bmp_sensors[bmp_idx].bmp_model >= 3) {
-          snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s{s}%s " D_GAS "{m}%s " D_UNIT_KILOOHM "{e}"), mqtt_data, name, gas_resistance);
+          WSContentSend_PD(PSTR("{s}%s " D_GAS "{m}%s " D_UNIT_KILOOHM "{e}"), name, gas_resistance);
         }
 #endif  // USE_BME680
+
 #endif  // USE_WEBSERVER
       }
     }
@@ -636,7 +637,7 @@ bool Xsns09(uint8_t function)
         BmpShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         BmpShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_10_bh1750.ino b/sonoff/xsns_10_bh1750.ino
index 95abc41c5..d4ffa3a10 100644
--- a/sonoff/xsns_10_bh1750.ino
+++ b/sonoff/xsns_10_bh1750.ino
@@ -100,7 +100,7 @@ void Bh1750Show(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ILLUMINANCE, mqtt_data, bh1750_types, bh1750_illuminance);
+      WSContentSend_PD(HTTP_SNS_ILLUMINANCE, bh1750_types, bh1750_illuminance);
 #endif  // USE_WEBSERVER
     }
   }
@@ -126,7 +126,7 @@ bool Xsns10(uint8_t function)
         Bh1750Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Bh1750Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_11_veml6070.ino b/sonoff/xsns_11_veml6070.ino
index c32fc090f..2222cc335 100644
--- a/sonoff/xsns_11_veml6070.ino
+++ b/sonoff/xsns_11_veml6070.ino
@@ -256,11 +256,11 @@ double Veml6070UvPower(double uvrisk)
 #ifdef USE_WEBSERVER
   // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 #ifdef USE_VEML6070_SHOW_RAW
-  const char HTTP_SNS_UV_LEVEL[] PROGMEM = "%s{s}VEML6070 " D_UV_LEVEL "{m}%s " D_UNIT_INCREMENTS "{e}";
+  const char HTTP_SNS_UV_LEVEL[] PROGMEM = "{s}VEML6070 " D_UV_LEVEL "{m}%s " D_UNIT_INCREMENTS "{e}";
 #endif  // USE_VEML6070_SHOW_RAW
   // different uv index level texts
-  const char HTTP_SNS_UV_INDEX[] PROGMEM = "%s{s}VEML6070 " D_UV_INDEX " {m}%s %s{e}";
-  const char HTTP_SNS_UV_POWER[] PROGMEM = "%s{s}VEML6070 " D_UV_POWER "{m}%s " D_UNIT_WATT_METER_QUADRAT "{e}";
+  const char HTTP_SNS_UV_INDEX[] PROGMEM = "{s}VEML6070 " D_UV_INDEX "{m}%s %s{e}";
+  const char HTTP_SNS_UV_POWER[] PROGMEM = "{s}VEML6070 " D_UV_POWER "{m}%s " D_UNIT_WATT_METER_QUADRAT "{e}";
 #endif  // USE_WEBSERVER
 
 /********************************************************************************************/
@@ -289,10 +289,10 @@ void Veml6070Show(bool json)
 #ifdef USE_WEBSERVER
     } else {
 #ifdef USE_VEML6070_SHOW_RAW
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_UV_LEVEL, mqtt_data, str_uvlevel);
+      WSContentSend_PD(HTTP_SNS_UV_LEVEL, str_uvlevel);
 #endif  // USE_VEML6070_SHOW_RAW
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_UV_INDEX, mqtt_data, str_uvrisk, str_uvrisk_text);
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_UV_POWER, mqtt_data, str_uvpower);
+      WSContentSend_PD(HTTP_SNS_UV_INDEX, str_uvrisk, str_uvrisk_text);
+      WSContentSend_PD(HTTP_SNS_UV_POWER, str_uvpower);
 #endif  // USE_WEBSERVER
     }
   }
@@ -310,7 +310,7 @@ bool Xsns11(uint8_t function)
     switch (function) {
       case FUNC_INIT:
         Veml6070Detect();         // 1[ms], detect and init the sensor
-	Veml6070UvTableInit();    // 1[ms], initalize the UV compare table only once
+        Veml6070UvTableInit();    // 1[ms], initalize the UV compare table only once
         break;
       case FUNC_EVERY_SECOND:
         Veml6070EverySecond();    // 10..15[ms], tested with OLED display, do all the actions needed to get all sensor values
@@ -319,7 +319,7 @@ bool Xsns11(uint8_t function)
         Veml6070Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Veml6070Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_12_ads1115.ino b/sonoff/xsns_12_ads1115.ino
index a8f0d8531..7c674debe 100644
--- a/sonoff/xsns_12_ads1115.ino
+++ b/sonoff/xsns_12_ads1115.ino
@@ -203,7 +203,7 @@ void Ads1115toString(uint8_t address)
   snprintf_P(label, sizeof(label), "ADS1115(%02x)", address);
 
   for (uint8_t i = 0; i < 4; i++) {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ANALOG, mqtt_data, label, i, ads1115_values[i]);
+    WSContentSend_PD(HTTP_SNS_ANALOG, label, i, ads1115_values[i]);
   }
 }
 
@@ -255,7 +255,7 @@ bool Xsns12(uint8_t function)
         Ads1115Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Ads1115Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_12_ads1115_i2cdev.ino b/sonoff/xsns_12_ads1115_i2cdev.ino
index f73581ec0..855658647 100644
--- a/sonoff/xsns_12_ads1115_i2cdev.ino
+++ b/sonoff/xsns_12_ads1115_i2cdev.ino
@@ -115,7 +115,7 @@ void Ads1115Show(bool json)
         strlcpy(stemp, ",", sizeof(stemp));
 #ifdef USE_WEBSERVER
       } else {
-        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ANALOG, mqtt_data, "ADS1115", i, adc_value);
+        WSContentSend_PD(HTTP_SNS_ANALOG, "ADS1115", i, adc_value);
 #endif  // USE_WEBSERVER
       }
     }
@@ -144,7 +144,7 @@ bool Xsns12(uint8_t function)
         Ads1115Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Ads1115Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_13_ina219.ino b/sonoff/xsns_13_ina219.ino
index 88f6ce240..fa6327f70 100644
--- a/sonoff/xsns_13_ina219.ino
+++ b/sonoff/xsns_13_ina219.ino
@@ -222,7 +222,7 @@ void Ina219EverySecond(void)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_SNS_INA219_DATA[] PROGMEM = "%s"
+const char HTTP_SNS_INA219_DATA[] PROGMEM =
   "{s}INA219 " D_VOLTAGE "{m}%s " D_UNIT_VOLT "{e}"
   "{s}INA219 " D_CURRENT "{m}%s " D_UNIT_AMPERE "{e}"
   "{s}INA219 " D_POWERUSAGE "{m}%s " D_UNIT_WATT "{e}";
@@ -250,7 +250,7 @@ void Ina219Show(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_INA219_DATA, mqtt_data, voltage, current, power);
+      WSContentSend_PD(HTTP_SNS_INA219_DATA, voltage, current, power);
 #endif  // USE_WEBSERVER
     }
   }
@@ -281,7 +281,7 @@ bool Xsns13(uint8_t function)
         Ina219Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Ina219Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_14_sht3x.ino b/sonoff/xsns_14_sht3x.ino
index fcb7f4a22..e7aa63007 100755
--- a/sonoff/xsns_14_sht3x.ino
+++ b/sonoff/xsns_14_sht3x.ino
@@ -126,8 +126,8 @@ void Sht3xShow(bool json)
 
 #ifdef USE_WEBSERVER
         } else {
-          snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, types, temperature, TempUnit());
-          snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, types, humidity);
+          WSContentSend_PD(HTTP_SNS_TEMP, types, temperature, TempUnit());
+          WSContentSend_PD(HTTP_SNS_HUM, types, humidity);
 #endif  // USE_WEBSERVER
         }
       }
@@ -152,7 +152,7 @@ bool Xsns14(uint8_t function)
         Sht3xShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Sht3xShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_15_mhz19.ino b/sonoff/xsns_15_mhz19.ino
index 1e21aa6fb..058336f39 100644
--- a/sonoff/xsns_15_mhz19.ino
+++ b/sonoff/xsns_15_mhz19.ino
@@ -351,8 +351,8 @@ void MhzShow(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
   } else {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_CO2, mqtt_data, types, mhz_last_ppm);
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, types, temperature, TempUnit());
+    WSContentSend_PD(HTTP_SNS_CO2, types, mhz_last_ppm);
+    WSContentSend_PD(HTTP_SNS_TEMP, types, temperature, TempUnit());
 #endif  // USE_WEBSERVER
   }
 }
@@ -382,7 +382,7 @@ bool Xsns15(uint8_t function)
         MhzShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         MhzShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_16_tsl2561.ino b/sonoff/xsns_16_tsl2561.ino
index 688cdf419..74f9fb0fb 100644
--- a/sonoff/xsns_16_tsl2561.ino
+++ b/sonoff/xsns_16_tsl2561.ino
@@ -95,7 +95,7 @@ void Tsl2561EverySecond(void)
 
 #ifdef USE_WEBSERVER
 const char HTTP_SNS_TSL2561[] PROGMEM =
-  "%s{s}TSL2561 " D_ILLUMINANCE "{m}%u.%03u " D_UNIT_LUX "{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+  "{s}TSL2561 " D_ILLUMINANCE "{m}%u.%03u " D_UNIT_LUX "{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 #endif  // USE_WEBSERVER
 
 void Tsl2561Show(bool json)
@@ -109,7 +109,7 @@ void Tsl2561Show(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TSL2561, mqtt_data, tsl2561_milliLux / 1000, tsl2561_milliLux % 1000);
+      WSContentSend_PD(HTTP_SNS_TSL2561, tsl2561_milliLux / 1000, tsl2561_milliLux % 1000);
 #endif  // USE_WEBSERVER
     }
   }
@@ -135,7 +135,7 @@ bool Xsns16(uint8_t function)
         Tsl2561Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Tsl2561Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_17_senseair.ino b/sonoff/xsns_17_senseair.ino
index 461b41145..b5772a4d1 100644
--- a/sonoff/xsns_17_senseair.ino
+++ b/sonoff/xsns_17_senseair.ino
@@ -159,10 +159,10 @@ void SenseairShow(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
   } else {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_CO2, mqtt_data, senseair_types, senseair_co2);
+    WSContentSend_PD(HTTP_SNS_CO2, senseair_types, senseair_co2);
     if (senseair_type != 2) {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, senseair_types, temperature, TempUnit());
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, senseair_types, humidity);
+      WSContentSend_PD(HTTP_SNS_TEMP, senseair_types, temperature, TempUnit());
+      WSContentSend_PD(HTTP_SNS_HUM, senseair_types, humidity);
     }
 #endif  // USE_WEBSERVER
   }
@@ -188,7 +188,7 @@ bool Xsns17(uint8_t function)
         SenseairShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         SenseairShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_18_pms5003.ino b/sonoff/xsns_18_pms5003.ino
index 82959ff88..6f9c97711 100644
--- a/sonoff/xsns_18_pms5003.ino
+++ b/sonoff/xsns_18_pms5003.ino
@@ -113,7 +113,7 @@ void PmsInit(void)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_PMS5003_SNS[] PROGMEM = "%s"
+const char HTTP_PMS5003_SNS[] PROGMEM =
 //  "{s}PMS5003 " D_STANDARD_CONCENTRATION " 1 " D_UNIT_MICROMETER "{m}%d " D_UNIT_MICROGRAM_PER_CUBIC_METER "{e}"
 //  "{s}PMS5003 " D_STANDARD_CONCENTRATION " 2.5 " D_UNIT_MICROMETER "{m}%d " D_UNIT_MICROGRAM_PER_CUBIC_METER "{e}"
 //  "{s}PMS5003 " D_STANDARD_CONCENTRATION " 10 " D_UNIT_MICROMETER "{m}%d " D_UNIT_MICROGRAM_PER_CUBIC_METER "{e}"
@@ -145,7 +145,7 @@ void PmsShow(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_PMS5003_SNS, mqtt_data,
+      WSContentSend_PD(HTTP_PMS5003_SNS,
 //        pms_data.pm10_standard, pms_data.pm25_standard, pms_data.pm100_standard,
         pms_data.pm10_env, pms_data.pm25_env, pms_data.pm100_env,
         pms_data.particles_03um, pms_data.particles_05um, pms_data.particles_10um, pms_data.particles_25um, pms_data.particles_50um, pms_data.particles_100um);
@@ -174,7 +174,7 @@ bool Xsns18(uint8_t function)
         PmsShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         PmsShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_19_mgs.ino b/sonoff/xsns_19_mgs.ino
index dacd1430e..942664b96 100644
--- a/sonoff/xsns_19_mgs.ino
+++ b/sonoff/xsns_19_mgs.ino
@@ -57,7 +57,7 @@ char* measure_gas(int gas_type, char* buffer)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_MGS_GAS[] PROGMEM = "%s{s}MGS %s{m}%s " D_UNIT_PARTS_PER_MILLION "{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_MGS_GAS[] PROGMEM = "{s}MGS %s{m}%s " D_UNIT_PARTS_PER_MILLION "{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 #endif // USE_WEBSERVER
 
 void MGSShow(bool json)
@@ -74,14 +74,14 @@ void MGSShow(bool json)
     snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"C2H5OH\":%s}"), mqtt_data, measure_gas(C2H5OH, buffer));
 #ifdef USE_WEBSERVER
   } else {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_MGS_GAS, mqtt_data, "NH3", measure_gas(NH3, buffer));
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_MGS_GAS, mqtt_data, "CO", measure_gas(CO, buffer));
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_MGS_GAS, mqtt_data, "NO2", measure_gas(NO2, buffer));
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_MGS_GAS, mqtt_data, "C3H8", measure_gas(C3H8, buffer));
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_MGS_GAS, mqtt_data, "C4H10", measure_gas(C4H10, buffer));
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_MGS_GAS, mqtt_data, "CH4", measure_gas(GAS_CH4, buffer));
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_MGS_GAS, mqtt_data, "H2", measure_gas(H2, buffer));
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_MGS_GAS, mqtt_data, "C2H5OH", measure_gas(C2H5OH, buffer));
+    WSContentSend_PD(HTTP_MGS_GAS, "NH3", measure_gas(NH3, buffer));
+    WSContentSend_PD(HTTP_MGS_GAS, "CO", measure_gas(CO, buffer));
+    WSContentSend_PD(HTTP_MGS_GAS, "NO2", measure_gas(NO2, buffer));
+    WSContentSend_PD(HTTP_MGS_GAS, "C3H8", measure_gas(C3H8, buffer));
+    WSContentSend_PD(HTTP_MGS_GAS, "C4H10", measure_gas(C4H10, buffer));
+    WSContentSend_PD(HTTP_MGS_GAS, "CH4", measure_gas(GAS_CH4, buffer));
+    WSContentSend_PD(HTTP_MGS_GAS, "H2", measure_gas(H2, buffer));
+    WSContentSend_PD(HTTP_MGS_GAS, "C2H5OH", measure_gas(C2H5OH, buffer));
 #endif // USE_WEBSERVER
   }
 }
@@ -107,7 +107,7 @@ bool Xsns19(uint8_t function)
         if (detected) MGSShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         if (detected) MGSShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_20_novasds.ino b/sonoff/xsns_20_novasds.ino
index d40301508..702d3d8fe 100644
--- a/sonoff/xsns_20_novasds.ino
+++ b/sonoff/xsns_20_novasds.ino
@@ -180,7 +180,7 @@ void NovaSdsInit(void)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_SDS0X1_SNS[] PROGMEM = "%s"
+const char HTTP_SDS0X1_SNS[] PROGMEM =
   "{s}SDS0X1 " D_ENVIRONMENTAL_CONCENTRATION " 2.5 " D_UNIT_MICROMETER "{m}%s " D_UNIT_MICROGRAM_PER_CUBIC_METER "{e}"
   "{s}SDS0X1 " D_ENVIRONMENTAL_CONCENTRATION " 10 " D_UNIT_MICROMETER "{m}%s " D_UNIT_MICROGRAM_PER_CUBIC_METER "{e}";      // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 #endif  // USE_WEBSERVER
@@ -204,7 +204,7 @@ void NovaSdsShow(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SDS0X1_SNS, mqtt_data, pm2_5, pm10);
+      WSContentSend_PD(HTTP_SDS0X1_SNS, pm2_5, pm10);
 #endif  // USE_WEBSERVER
     }
   }
@@ -230,7 +230,7 @@ bool Xsns20(uint8_t function)
         NovaSdsShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         NovaSdsShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_21_sgp30.ino b/sonoff/xsns_21_sgp30.ino
index 48fde6793..a544e4472 100644
--- a/sonoff/xsns_21_sgp30.ino
+++ b/sonoff/xsns_21_sgp30.ino
@@ -63,7 +63,7 @@ void Sgp30Update(void)  // Perform every second to ensure proper operation of th
   }
 }
 
-const char HTTP_SNS_SGP30[] PROGMEM = "%s"
+const char HTTP_SNS_SGP30[] PROGMEM =
   "{s}SGP30 " D_ECO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}"                // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
   "{s}SGP30 " D_TVOC "{m}%d " D_UNIT_PARTS_PER_BILLION "{e}";
 
@@ -77,7 +77,7 @@ void Sgp30Show(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_SGP30, mqtt_data, sgp.eCO2, sgp.TVOC);
+      WSContentSend_PD(HTTP_SNS_SGP30, sgp.eCO2, sgp.TVOC);
 #endif
     }
   }
@@ -100,7 +100,7 @@ bool Xsns21(uint8_t function)
         Sgp30Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Sgp30Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_22_sr04.ino b/sonoff/xsns_22_sr04.ino
index a52898728..3c8a933bf 100644
--- a/sonoff/xsns_22_sr04.ino
+++ b/sonoff/xsns_22_sr04.ino
@@ -45,7 +45,7 @@ void Sr04Init(void)
 
 #ifdef USE_WEBSERVER
 const char HTTP_SNS_DISTANCE[] PROGMEM =
-  "%s{s}SR04 " D_DISTANCE "{m}%s" D_UNIT_CENTIMETER "{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+  "{s}SR04 " D_DISTANCE "{m}%s" D_UNIT_CENTIMETER "{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 #endif  // USE_WEBSERVER
 
 void Sr04Show(bool json)
@@ -65,7 +65,7 @@ void Sr04Show(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_DISTANCE, mqtt_data, distance_chr);
+      WSContentSend_PD(HTTP_SNS_DISTANCE, distance_chr);
 #endif  // USE_WEBSERVER
     }
   }
@@ -88,7 +88,7 @@ bool Xsns22(uint8_t function)
         Sr04Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Sr04Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_23_sdm120.ino b/sonoff/xsns_23_sdm120.ino
index 67971845a..c77ca1875 100644
--- a/sonoff/xsns_23_sdm120.ino
+++ b/sonoff/xsns_23_sdm120.ino
@@ -260,7 +260,7 @@ void SDM120Init(void)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_SNS_SDM120_DATA[] PROGMEM = "%s"
+const char HTTP_SNS_SDM120_DATA[] PROGMEM =
   "{s}SDM120 " D_VOLTAGE "{m}%s " D_UNIT_VOLT "{e}"
   "{s}SDM120 " D_CURRENT "{m}%s " D_UNIT_AMPERE "{e}"
   "{s}SDM120 " D_POWERUSAGE_ACTIVE "{m}%s " D_UNIT_WATT "{e}"
@@ -330,9 +330,9 @@ void SDM120Show(bool json)
 #ifdef USE_WEBSERVER
   } else {
 #ifdef USE_SDM220
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_SDM120_DATA, mqtt_data, voltage, current, active_power, apparent_power, reactive_power, power_factor, frequency, energy_total, phase_angle,import_active,export_active,import_reactive,export_reactive,total_reactive);
+    WSContentSend_PD(HTTP_SNS_SDM120_DATA, voltage, current, active_power, apparent_power, reactive_power, power_factor, frequency, energy_total, phase_angle,import_active,export_active,import_reactive,export_reactive,total_reactive);
 #else
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_SDM120_DATA, mqtt_data, voltage, current, active_power, apparent_power, reactive_power, power_factor, frequency, energy_total);
+    WSContentSend_PD(HTTP_SNS_SDM120_DATA, voltage, current, active_power, apparent_power, reactive_power, power_factor, frequency, energy_total);
 #endif  // USE_SDM220
 #endif  // USE_WEBSERVER
   }
@@ -358,7 +358,7 @@ bool Xsns23(uint8_t function)
         SDM120Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         SDM120Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_24_si1145.ino b/sonoff/xsns_24_si1145.ino
index 19855bf42..56bce1018 100644
--- a/sonoff/xsns_24_si1145.ino
+++ b/sonoff/xsns_24_si1145.ino
@@ -316,7 +316,7 @@ void Si1145Update(void)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_SNS_SI1145[] PROGMEM = "%s"
+const char HTTP_SNS_SI1145[] PROGMEM =
   "{s}SI1145 " D_ILLUMINANCE "{m}%d " D_UNIT_LUX "{e}"     // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
   "{s}SI1145 " D_INFRARED "{m}%d " D_UNIT_LUX "{e}"
   "{s}SI1145 " D_UV_INDEX "{m}%d.%d{e}";
@@ -336,7 +336,7 @@ void Si1145Show(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_SI1145, mqtt_data, visible, infrared, uvindex /100, uvindex %100);
+      WSContentSend_PD(HTTP_SNS_SI1145, visible, infrared, uvindex /100, uvindex %100);
 #endif
     }
   } else {
@@ -361,7 +361,7 @@ bool Xsns24(uint8_t function)
         Si1145Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Si1145Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_25_sdm630.ino b/sonoff/xsns_25_sdm630.ino
index 2f8e0acd8..013964915 100644
--- a/sonoff/xsns_25_sdm630.ino
+++ b/sonoff/xsns_25_sdm630.ino
@@ -257,7 +257,7 @@ void SDM630Init(void)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_SNS_SDM630_DATA[] PROGMEM = "%s"
+const char HTTP_SNS_SDM630_DATA[] PROGMEM =
   "{s}SDM630 " D_VOLTAGE "{m}%s/%s/%s " D_UNIT_VOLT "{e}"
   "{s}SDM630 " D_CURRENT "{m}%s/%s/%s " D_UNIT_AMPERE "{e}"
   "{s}SDM630 " D_POWERUSAGE_ACTIVE "{m}%s/%s/%s " D_UNIT_WATT "{e}"
@@ -312,7 +312,7 @@ void SDM630Show(bool json)
       current_l1, current_l2, current_l3);
 #ifdef USE_WEBSERVER
   } else {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_SDM630_DATA, mqtt_data,
+    WSContentSend_PD(HTTP_SNS_SDM630_DATA,
     voltage_l1, voltage_l2, voltage_l3, current_l1, current_l2, current_l3,
     active_power_l1, active_power_l2, active_power_l3,
     reactive_power_l1, reactive_power_l2, reactive_power_l3,
@@ -341,7 +341,7 @@ bool Xsns25(uint8_t function)
         SDM630Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         SDM630Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_26_lm75ad.ino b/sonoff/xsns_26_lm75ad.ino
index 8a48327bf..b7b92fca7 100644
--- a/sonoff/xsns_26_lm75ad.ino
+++ b/sonoff/xsns_26_lm75ad.ino
@@ -91,7 +91,7 @@ void LM75ADShow(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, "LM75AD", temperature, TempUnit());
+      WSContentSend_PD(HTTP_SNS_TEMP, "LM75AD", temperature, TempUnit());
 #endif  // USE_WEBSERVER
     }
   }
@@ -114,7 +114,7 @@ bool Xsns26(uint8_t function)
         LM75ADShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         LM75ADShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_27_apds9960.ino b/sonoff/xsns_27_apds9960.ino
index 765c89263..5be8b0e5b 100644
--- a/sonoff/xsns_27_apds9960.ino
+++ b/sonoff/xsns_27_apds9960.ino
@@ -77,7 +77,7 @@ volatile uint8_t recovery_loop_counter = 0;  //count number of stateloops to swi
 bool APDS9960_overload = false;
 
 #ifdef USE_WEBSERVER
-const char HTTP_APDS_9960_SNS[] PROGMEM = "%s"
+const char HTTP_APDS_9960_SNS[] PROGMEM =
   "{s}" "Red" "{m}%s{e}"
   "{s}" "Green" "{m}%s{e}"
   "{s}" "Blue" "{m}%s{e}"
@@ -1963,7 +1963,7 @@ void APDS9960_show(bool json)
         mqtt_data, APDS9960stype, red_chr, green_chr, blue_chr, ambient_chr, cct_chr, prox_chr);
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_APDS_9960_SNS, mqtt_data, red_chr, green_chr, blue_chr, ambient_chr, cct_chr, prox_chr );
+      WSContentSend_PD(HTTP_APDS_9960_SNS, red_chr, green_chr, blue_chr, ambient_chr, cct_chr, prox_chr );
 #endif  // USE_WEBSERVER
     }
   }
@@ -2055,7 +2055,7 @@ bool Xsns27(uint8_t function)
             APDS9960_show(1);
             break;
 #ifdef USE_WEBSERVER
-        case FUNC_WEB_APPEND:
+        case FUNC_WEB_SENSOR:
           APDS9960_show(0);
           break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_28_tm1638.ino b/sonoff/xsns_28_tm1638.ino
index 590432dfd..05e756966 100644
--- a/sonoff/xsns_28_tm1638.ino
+++ b/sonoff/xsns_28_tm1638.ino
@@ -215,7 +215,7 @@ bool Xsns28(uint8_t function)
         TmShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         TmShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_29_mcp230xx.ino b/sonoff/xsns_29_mcp230xx.ino
index d7aaaf2ef..5aa4992dd 100644
--- a/sonoff/xsns_29_mcp230xx.ino
+++ b/sonoff/xsns_29_mcp230xx.ino
@@ -694,7 +694,7 @@ bool MCP230xx_Command(void) {
 
 #ifdef USE_MCP230xx_DISPLAYOUTPUT
 
-const char HTTP_SNS_MCP230xx_OUTPUT[] PROGMEM = "%s{s}MCP230XX D%d{m}%s{e}"; // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_SNS_MCP230xx_OUTPUT[] PROGMEM = "{s}MCP230XX D%d{m}%s{e}"; // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 
 void MCP230xx_UpdateWebData(void) {
   uint8_t gpio1 = MCP230xx_readGPIO(0);
@@ -707,7 +707,7 @@ void MCP230xx_UpdateWebData(void) {
     if (Settings.mcp230xx_config[pin].pinmode >= 5) {
       char stt[7];
       sprintf(stt,ConvertNumTxt((gpio>>pin)&1,Settings.mcp230xx_config[pin].pinmode));
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_MCP230xx_OUTPUT, mqtt_data, pin, stt);
+      WSContentSend_PD(HTTP_SNS_MCP230xx_OUTPUT, pin, stt);
     }
   }
 }
@@ -822,7 +822,7 @@ bool Xsns29(uint8_t function)
 #ifdef USE_WEBSERVER
 #ifdef USE_MCP230xx_OUTPUT
 #ifdef USE_MCP230xx_DISPLAYOUTPUT
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         MCP230xx_UpdateWebData();
         break;
 #endif // USE_MCP230xx_DISPLAYOUTPUT
diff --git a/sonoff/xsns_30_mpr121.ino b/sonoff/xsns_30_mpr121.ino
index 01431faa6..10ea46078 100644
--- a/sonoff/xsns_30_mpr121.ino
+++ b/sonoff/xsns_30_mpr121.ino
@@ -356,8 +356,8 @@ void Mpr121Show(struct mpr121 *pS, uint8_t function)
 				}
 				// Add buttons to web string
 #ifdef USE_WEBSERVER
-				if (FUNC_WEB_APPEND == function) {
-					snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s{s}MPR121%c Button%d{m}%d{e}"), mqtt_data, pS->id[i], j, BITC(i, j));
+				if (FUNC_WEB_SENSOR == function) {
+					WSContentSend_PD(PSTR("{s}MPR121%c Button%d{m}%d{e}"), pS->id[i], j, BITC(i, j));
 				}
 #endif				// USE_WEBSERVER
 
@@ -389,7 +389,7 @@ void Mpr121Show(struct mpr121 *pS, uint8_t function)
  * FUNC_INIT to initialize a driver,
  * FUNC_EVERY_50_MSECOND for near real-time operation,
  * FUNC_JSON_APPEND for telemetry data and
- * FUNC_WEB_APPEND for displaying data in the Tasmota web-interface
+ * FUNC_WEB_SENSOR for displaying data in the Tasmota web-interface
  *
  * @param   byte    function  Tasmota function ID.
  * @return  bool           ???
@@ -426,8 +426,8 @@ bool Xsns30(uint8_t function)
 
 #ifdef USE_WEBSERVER
 			// Show sensor data on main web page
-		case FUNC_WEB_APPEND:
-			Mpr121Show(&mpr121, FUNC_WEB_APPEND);
+		case FUNC_WEB_SENSOR:
+			Mpr121Show(&mpr121, FUNC_WEB_SENSOR);
 			break;
 #endif				// USE_WEBSERVER
 		}
diff --git a/sonoff/xsns_31_ccs811.ino b/sonoff/xsns_31_ccs811.ino
index 173cbe388..9ce63b228 100644
--- a/sonoff/xsns_31_ccs811.ino
+++ b/sonoff/xsns_31_ccs811.ino
@@ -77,7 +77,7 @@ void CCS811Update(void)  // Perform every n second
   }
 }
 
-const char HTTP_SNS_CCS811[] PROGMEM = "%s"
+const char HTTP_SNS_CCS811[] PROGMEM =
   "{s}CCS811 " D_ECO2 "{m}%d " D_UNIT_PARTS_PER_MILLION "{e}"                // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
   "{s}CCS811 " D_TVOC "{m}%d " D_UNIT_PARTS_PER_BILLION "{e}";
 
@@ -91,7 +91,7 @@ void CCS811Show(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_CCS811, mqtt_data, eCO2, TVOC);
+      WSContentSend_PD(HTTP_SNS_CCS811, eCO2, TVOC);
 #endif
     }
   }
@@ -114,7 +114,7 @@ bool Xsns31(uint8_t function)
         CCS811Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         CCS811Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_32_mpu6050.ino b/sonoff/xsns_32_mpu6050.ino
index 61156f9c1..e7dddd953 100644
--- a/sonoff/xsns_32_mpu6050.ino
+++ b/sonoff/xsns_32_mpu6050.ino
@@ -155,12 +155,13 @@ void MPU_6050Detect(void)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_SNS_AX_AXIS[] PROGMEM = "%s{s}%s " D_AX_AXIS "{m}%s{e}";                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_SNS_AY_AXIS[] PROGMEM = "%s{s}%s " D_AY_AXIS "{m}%s{e}";                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_SNS_AZ_AXIS[] PROGMEM = "%s{s}%s " D_AZ_AXIS "{m}%s{e}";                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_SNS_GX_AXIS[] PROGMEM = "%s{s}%s " D_GX_AXIS "{m}%s{e}";                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_SNS_GY_AXIS[] PROGMEM = "%s{s}%s " D_GY_AXIS "{m}%s{e}";                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_SNS_GZ_AXIS[] PROGMEM = "%s{s}%s " D_GZ_AXIS "{m}%s{e}";                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+const char HTTP_SNS_AXIS[] PROGMEM =
+  "{s}" D_SENSOR_MPU6050 " " D_AX_AXIS "{m}%s{e}"                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+  "{s}" D_SENSOR_MPU6050 " " D_AY_AXIS "{m}%s{e}"                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+  "{s}" D_SENSOR_MPU6050 " " D_AZ_AXIS "{m}%s{e}"                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+  "{s}" D_SENSOR_MPU6050 " " D_GX_AXIS "{m}%s{e}"                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+  "{s}" D_SENSOR_MPU6050 " " D_GY_AXIS "{m}%s{e}"                              // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
+  "{s}" D_SENSOR_MPU6050 " " D_GZ_AXIS "{m}%s{e}";                             // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
 #endif // USE_WEBSERVER
 
 #define D_JSON_AXIS_AX "AccelXAxis"
@@ -211,13 +212,8 @@ void MPU_6050Show(bool json)
 #endif // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, D_SENSOR_MPU6050, temperature, TempUnit());
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_AX_AXIS, mqtt_data, D_SENSOR_MPU6050, axis_ax);
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_AY_AXIS, mqtt_data, D_SENSOR_MPU6050, axis_ay);
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_AZ_AXIS, mqtt_data, D_SENSOR_MPU6050, axis_az);
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_GX_AXIS, mqtt_data, D_SENSOR_MPU6050, axis_gx);
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_GY_AXIS, mqtt_data, D_SENSOR_MPU6050, axis_gy);
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_GZ_AXIS, mqtt_data, D_SENSOR_MPU6050, axis_gz);
+      WSContentSend_PD(HTTP_SNS_TEMP, D_SENSOR_MPU6050, temperature, TempUnit());
+      WSContentSend_PD(HTTP_SNS_AXIS, axis_ax, axis_ay, axis_az, axis_gx, axis_gy, axis_gz);
 #endif // USE_WEBSERVER
     }
   }
@@ -245,7 +241,7 @@ bool Xsns32(uint8_t function)
         MPU_6050Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         MPU_6050Show(0);
         MPU_6050PerformReading();
         break;
diff --git a/sonoff/xsns_34_hx711.ino b/sonoff/xsns_34_hx711.ino
index c287ef3f4..568936db1 100644
--- a/sonoff/xsns_34_hx711.ino
+++ b/sonoff/xsns_34_hx711.ino
@@ -321,11 +321,11 @@ void HxEvery100mSecond(void)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_HX711_WEIGHT[] PROGMEM = "%s"
+const char HTTP_HX711_WEIGHT[] PROGMEM =
   "{s}HX711 " D_WEIGHT "{m}%s " D_UNIT_KILOGRAM "{e}";  // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
-const char HTTP_HX711_COUNT[] PROGMEM = "%s"
+const char HTTP_HX711_COUNT[] PROGMEM =
   "{s}HX711 " D_COUNT "{m}%d{e}";
-const char HTTP_HX711_CAL[] PROGMEM = "%s"
+const char HTTP_HX711_CAL[] PROGMEM =
   "{s}HX711 %s{m}{e}";
 #endif  // USE_WEBSERVER
 
@@ -351,13 +351,13 @@ void HxShow(bool json)
     snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"HX711\":{\"" D_JSON_WEIGHT "\":%s%s}"), mqtt_data, weight_chr, scount);
 #ifdef USE_WEBSERVER
   } else {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_HX711_WEIGHT, mqtt_data, weight_chr);
+    WSContentSend_PD(HTTP_HX711_WEIGHT, weight_chr);
     if (count > 1) {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_HX711_COUNT, mqtt_data, count);
+      WSContentSend_PD(HTTP_HX711_COUNT, count);
     }
     if (hx_calibrate_step) {
       char cal_text[30];
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_HX711_CAL, mqtt_data, GetTextIndexed(cal_text, sizeof(cal_text), hx_calibrate_msg, kHxCalibrationStates));
+      WSContentSend_PD(HTTP_HX711_CAL, GetTextIndexed(cal_text, sizeof(cal_text), hx_calibrate_msg, kHxCalibrationStates));
     }
 #endif  // USE_WEBSERVER
   }
@@ -485,7 +485,7 @@ bool Xsns34(uint8_t function)
         HxShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         HxShow(0);
         break;
 #ifdef USE_HX711_GUI
diff --git a/sonoff/xsns_35_tx20.ino b/sonoff/xsns_35_tx20.ino
index bae2e9532..444c5231d 100644
--- a/sonoff/xsns_35_tx20.ino
+++ b/sonoff/xsns_35_tx20.ino
@@ -39,7 +39,7 @@ extern "C" {
 
 #ifdef USE_WEBSERVER
 
-const char HTTP_SNS_TX20[] PROGMEM = "%s"
+const char HTTP_SNS_TX20[] PROGMEM =
    "{s}TX20 " D_TX20_WIND_SPEED "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}"
    "{s}TX20 " D_TX20_WIND_SPEED_AVG "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}"
    "{s}TX20 " D_TX20_WIND_SPEED_MAX "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}"
@@ -186,7 +186,7 @@ void Tx20Show(bool json)
       mqtt_data, wind_speed_string, wind_speed_avg_string, wind_speed_max_string, wind_direction_string);
 #ifdef USE_WEBSERVER
   } else {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TX20, mqtt_data, wind_speed_string, wind_speed_avg_string, wind_speed_max_string, wind_direction_string);
+    WSContentSend_PD(HTTP_SNS_TX20, wind_speed_string, wind_speed_avg_string, wind_speed_max_string, wind_direction_string);
 #endif  // USE_WEBSERVER
   }
 }
@@ -211,7 +211,7 @@ bool Xsns35(uint8_t function)
         Tx20Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Tx20Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_36_mgc3130.ino b/sonoff/xsns_36_mgc3130.ino
index 5c1d2df48..c767c192c 100644
--- a/sonoff/xsns_36_mgc3130.ino
+++ b/sonoff/xsns_36_mgc3130.ino
@@ -67,7 +67,7 @@ char MGC3130stype[8];
 
 
 #ifdef USE_WEBSERVER
-const char HTTP_MGC_3130_SNS[] PROGMEM = "%s"
+const char HTTP_MGC_3130_SNS[] PROGMEM =
   "{s}" "%s" "{m}%s{e}"
   "{s}" "HwRev" "{m}%u.%u{e}"
   "{s}" "loaderVer" "{m}%u.%u{e}"
@@ -555,7 +555,7 @@ void MGC3130_show(bool json)
     }
 #ifdef USE_WEBSERVER
   } else {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_MGC_3130_SNS, mqtt_data, MGC3130stype, status_chr, hwRev[0], hwRev[1], loaderVersion[0], loaderVersion[1], loaderPlatform );
+    WSContentSend_PD(HTTP_MGC_3130_SNS, MGC3130stype, status_chr, hwRev[0], hwRev[1], loaderVersion[0], loaderVersion[1], loaderPlatform );
 #endif  // USE_WEBSERVER
   }
 }
@@ -622,7 +622,7 @@ bool Xsns36(uint8_t function)
           MGC3130_show(1);
           break;
 #ifdef USE_WEBSERVER
-        case FUNC_WEB_APPEND:
+        case FUNC_WEB_SENSOR:
           MGC3130_show(0);
           break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_37_rfsensor.ino b/sonoff/xsns_37_rfsensor.ino
index efb6ded06..7230ae692 100644
--- a/sonoff/xsns_37_rfsensor.ino
+++ b/sonoff/xsns_37_rfsensor.ino
@@ -287,8 +287,8 @@ void RfSnsTheoV2Show(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
         } else {
-          snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, sensor, temperature, TempUnit());
-          snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ILLUMINANCE, mqtt_data, sensor, rfsns_theo_v2_t1[i].lux);
+          WSContentSend_PD(HTTP_SNS_TEMP, sensor, temperature, TempUnit());
+          WSContentSend_PD(HTTP_SNS_ILLUMINANCE, sensor, rfsns_theo_v2_t1[i].lux);
 #endif  // USE_WEBSERVER
         }
       }
@@ -331,8 +331,8 @@ void RfSnsTheoV2Show(bool json)
           }
 #ifdef USE_WEBSERVER
         } else {
-          snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, sensor, temperature, TempUnit());
-          snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, sensor, humidity);
+          WSContentSend_PD(HTTP_SNS_TEMP, sensor, temperature, TempUnit());
+          WSContentSend_PD(HTTP_SNS_HUM, sensor, humidity);
 #endif  // USE_WEBSERVER
         }
       }
@@ -539,11 +539,11 @@ uint8_t RfSnsAlectoCRC8(uint8_t *addr, uint8_t len)
 }
 
 #ifdef USE_WEBSERVER
-const char HTTP_SNS_ALECTOV2[] PROGMEM = "%s"
+const char HTTP_SNS_ALECTOV2[] PROGMEM =
   "{s}" D_ALECTOV2 " " D_RAIN "{m}%s " D_UNIT_MILLIMETER "{e}"
   "{s}" D_ALECTOV2 " " D_TX20_WIND_SPEED "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}"
   "{s}" D_ALECTOV2 " " D_TX20_WIND_SPEED_MAX "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}";
-const char HTTP_SNS_ALECTOV2_WDIR[] PROGMEM = "%s"
+const char HTTP_SNS_ALECTOV2_WDIR[] PROGMEM =
   "{s}" D_ALECTOV2 " " D_TX20_WIND_DIRECTION "{m}%s{e}";
 #endif
 
@@ -588,11 +588,11 @@ void RfSnsAlectoV2Show(bool json)
         }
 #ifdef USE_WEBSERVER
       } else {
-        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, D_ALECTOV2, temperature, TempUnit());
-        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, D_ALECTOV2, humidity);
-        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ALECTOV2, mqtt_data, rain, wind, gust);
+        WSContentSend_PD(HTTP_SNS_TEMP, D_ALECTOV2, temperature, TempUnit());
+        WSContentSend_PD(HTTP_SNS_HUM, D_ALECTOV2, humidity);
+        WSContentSend_PD(HTTP_SNS_ALECTOV2, rain, wind, gust);
         if (rfsns_alecto_v2->type) {
-          snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ALECTOV2_WDIR, mqtt_data, wdir);
+          WSContentSend_PD(HTTP_SNS_ALECTOV2_WDIR, wdir);
         }
 #endif  // USE_WEBSERVER
       }
@@ -680,7 +680,7 @@ bool Xsns37(uint8_t function)
         RfSnsShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         RfSnsShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_38_az7798.ino b/sonoff/xsns_38_az7798.ino
index 3ec73085e..953832d6f 100644
--- a/sonoff/xsns_38_az7798.ino
+++ b/sonoff/xsns_38_az7798.ino
@@ -264,9 +264,9 @@ void AzShow(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
   } else {
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_CO2, mqtt_data, ktype, az_co2);
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, ktype, temperature, TempUnit());
-    snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, ktype, humidity);
+    WSContentSend_PD(HTTP_SNS_CO2, ktype, az_co2);
+    WSContentSend_PD(HTTP_SNS_TEMP, ktype, temperature, TempUnit());
+    WSContentSend_PD(HTTP_SNS_HUM, ktype, humidity);
 #endif  // USE_WEBSERVER
   }
 }
@@ -291,7 +291,7 @@ bool Xsns38(uint8_t function)
         AzShow(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         AzShow(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_39_max31855.ino b/sonoff/xsns_39_max31855.ino
index 10630e171..a6275caa7 100644
--- a/sonoff/xsns_39_max31855.ino
+++ b/sonoff/xsns_39_max31855.ino
@@ -101,7 +101,7 @@ int32_t MAX31855_ShiftIn(uint8_t Length){
 
     digitalWrite(pin[GPIO_MAX31855CS], LOW);            // CS = LOW -> Start SPI communication
     delayMicroseconds(1);                               // CS fall to output enable = max. 100ns
-    
+
     for(uint8_t i = 0; i < Length; i++)
     {
         digitalWrite(pin[GPIO_MAX31855CLK], LOW);
@@ -115,7 +115,7 @@ int32_t MAX31855_ShiftIn(uint8_t Length){
 
     digitalWrite(pin[GPIO_MAX31855CS], HIGH);           // CS = HIGH -> End SPI communication
     digitalWrite(pin[GPIO_MAX31855CLK], LOW);
-    return dataIn;    
+    return dataIn;
 }
 
 void MAX31855_Show(bool Json){
@@ -139,7 +139,7 @@ void MAX31855_Show(bool Json){
 #endif  // USE_KNX
     } else {
 #ifdef USE_WEBSERVER
-        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, "MAX31855", probetemp, TempUnit());
+        WSContentSend_PD(HTTP_SNS_TEMP, "MAX31855", probetemp, TempUnit());
 #endif  // USE_WEBSERVER
     }
 }
@@ -164,7 +164,7 @@ bool Xsns39(uint8_t function)
         MAX31855_Show(true);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         MAX31855_Show(false);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_41_max44009.ino b/sonoff/xsns_41_max44009.ino
index 1cb0e97a7..58a809ed9 100644
--- a/sonoff/xsns_41_max44009.ino
+++ b/sonoff/xsns_41_max44009.ino
@@ -139,8 +139,7 @@ void Max4409Show(bool json)
 #ifdef USE_WEBSERVER
     } else {
       // show integer value for lx on web-server
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ILLUMINANCE,
-                 mqtt_data, max44009_types, (int)max44009_illuminance);
+      WSContentSend_PD(HTTP_SNS_ILLUMINANCE, max44009_types, (int)max44009_illuminance);
 #endif  // USE_WEBSERVER
     }
   }
@@ -166,7 +165,7 @@ bool Xsns41(uint8_t function)
         Max4409Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Max4409Show(0);
         break;
 #endif  // USE_WEBSERVER
diff --git a/sonoff/xsns_42_scd30.ino b/sonoff/xsns_42_scd30.ino
index c62df4d25..defa01892 100644
--- a/sonoff/xsns_42_scd30.ino
+++ b/sonoff/xsns_42_scd30.ino
@@ -452,10 +452,10 @@ void Scd30Show(bool json)
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER
     } else {
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_CO2EAVG, mqtt_data, "SCD30", scd30_CO2EAvg);
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_CO2, mqtt_data, "SCD30", scd30_CO2);
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, "SCD30", temperature, TempUnit());
-      snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, "SCD30", humidity);
+      WSContentSend_PD(HTTP_SNS_CO2EAVG, "SCD30", scd30_CO2EAvg);
+      WSContentSend_PD(HTTP_SNS_CO2, "SCD30", scd30_CO2);
+      WSContentSend_PD(HTTP_SNS_TEMP, "SCD30", temperature, TempUnit());
+      WSContentSend_PD(HTTP_SNS_HUM, "SCD30", humidity);
 #endif  // USE_WEBSERVER
     }
   }
@@ -481,7 +481,7 @@ bool Xsns42(byte function)
         Scd30Show(1);
         break;
 #ifdef USE_WEBSERVER
-      case FUNC_WEB_APPEND:
+      case FUNC_WEB_SENSOR:
         Scd30Show(0);
         break;
 #endif  // USE_WEBSERVER