diff --git a/main/ZgatewayRF.ino b/main/ZgatewayRF.ino
index a4e8fae..468b7f1 100644
--- a/main/ZgatewayRF.ino
+++ b/main/ZgatewayRF.ino
@@ -127,12 +127,7 @@ void setupRF() {
 
 void RFtoMQTT() {
   if (mySwitch.available()) {
-#  ifdef ZradioCC1101 //receiving with CC1101
-    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(8);
-#  else
-    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(7);
-#  endif
-    StaticJsonDocument<JSON_MSG_CALC_BUFFER> jsonBuffer;
+    StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
     JsonObject RFdata = jsonBuffer.to<JsonObject>();
     Log.trace(F("Rcv. RF" CR));
 #  ifdef ESP32
diff --git a/main/ZgatewayRF2.ino b/main/ZgatewayRF2.ino
index aadab47..fd894d8 100644
--- a/main/ZgatewayRF2.ino
+++ b/main/ZgatewayRF2.ino
@@ -119,8 +119,7 @@ void RF2toMQTTdiscovery(JsonObject& data) {
 void RF2toMQTT() {
   if (rf2rd.hasNewData) {
     Log.trace(F("Creating RF2 buffer" CR));
-    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(5);
-    StaticJsonDocument<JSON_MSG_CALC_BUFFER> jsonBuffer;
+    StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
     JsonObject RF2data = jsonBuffer.to<JsonObject>();
 
     rf2rd.hasNewData = false;
diff --git a/main/ZgatewayWeatherStation.ino b/main/ZgatewayWeatherStation.ino
index 7fb72fe..a5eac1e 100644
--- a/main/ZgatewayWeatherStation.ino
+++ b/main/ZgatewayWeatherStation.ino
@@ -36,8 +36,7 @@ void PairedDeviceAdded(byte newID) {
   Serial.print("ZgatewayWeatherStation: New device paired ");
   Serial.println(newID, DEC);
 #  endif
-  const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(2);
-  StaticJsonDocument<JSON_MSG_CALC_BUFFER> jsonBuffer;
+  StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
   JsonObject RFdata = jsonBuffer.to<JsonObject>();
   RFdata["sensor"] = newID;
   RFdata["action"] = "paired";
@@ -55,8 +54,7 @@ void setupWeatherStation() {
 void sendWindSpeedData(byte id, float wind_speed, byte battery_status) {
   unsigned long MQTTvalue = 10000 + round(wind_speed);
   if (!isAduplicateSignal(MQTTvalue)) { // conditions to avoid duplications of RF -->MQTT
-    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(3);
-    StaticJsonDocument<JSON_MSG_CALC_BUFFER> jsonBuffer;
+    StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
     JsonObject RFdata = jsonBuffer.to<JsonObject>();
     RFdata["sensor"] = id;
     RFdata["wind_speed"] = wind_speed;
@@ -70,8 +68,7 @@ void sendWindSpeedData(byte id, float wind_speed, byte battery_status) {
 void sendRainData(byte id, float rain_volume, byte battery_status) {
   unsigned long MQTTvalue = 11000 + round(rain_volume * 10.0);
   if (!isAduplicateSignal(MQTTvalue)) { // conditions to avoid duplications of RF -->MQTT
-    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(3);
-    StaticJsonDocument<JSON_MSG_CALC_BUFFER> jsonBuffer;
+    StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
     JsonObject RFdata = jsonBuffer.to<JsonObject>();
     RFdata["sensor"] = id;
     RFdata["rain_volume"] = rain_volume;
@@ -85,8 +82,7 @@ void sendRainData(byte id, float rain_volume, byte battery_status) {
 void sendWindData(byte id, int wind_direction, float wind_gust, byte battery_status) {
   unsigned long MQTTvalue = 20000 + round(wind_gust * 10.0) + wind_direction;
   if (!isAduplicateSignal(MQTTvalue)) { // conditions to avoid duplications of RF -->MQTT
-    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(4);
-    StaticJsonDocument<JSON_MSG_CALC_BUFFER> jsonBuffer;
+    StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
     JsonObject RFdata = jsonBuffer.to<JsonObject>();
     RFdata["sensor"] = id;
     RFdata["wind_direction"] = wind_direction;
@@ -101,8 +97,7 @@ void sendWindData(byte id, int wind_direction, float wind_gust, byte battery_sta
 void sendTemperatureData(byte id, float temperature, int humidity, byte battery_status) {
   unsigned long MQTTvalue = 40000 + abs(round(temperature * 100.0)) + humidity;
   if (!isAduplicateSignal(MQTTvalue)) { // conditions to avoid duplications of RF -->MQTT
-    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(4);
-    StaticJsonDocument<JSON_MSG_CALC_BUFFER> jsonBuffer;
+    StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
     JsonObject RFdata = jsonBuffer.to<JsonObject>();
     RFdata["sensor"] = id;
     RFdata["tempc"] = temperature;
diff --git a/main/ZsensorADC.ino b/main/ZsensorADC.ino
index 0b3d903..89cf24d 100644
--- a/main/ZsensorADC.ino
+++ b/main/ZsensorADC.ino
@@ -54,12 +54,7 @@ void MeasureADC() {
     } else {
       if (val >= persistedadc + ThresholdReadingADC || val <= persistedadc - ThresholdReadingADC) {
         Log.trace(F("Creating ADC buffer" CR));
-#  if defined(ADC_DIVIDER)
-        const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(2);
-#  else
-        const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(1);
-#  endif
-        StaticJsonDocument<JSON_MSG_CALC_BUFFER> jsonBuffer;
+        StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
         JsonObject ADCdata = jsonBuffer.to<JsonObject>();
         ADCdata["adc"] = (int)val;
 #  if defined(ADC_DIVIDER)
diff --git a/main/ZsensorGPIOInput.ino b/main/ZsensorGPIOInput.ino
index 424a1d4..3bc1a5f 100644
--- a/main/ZsensorGPIOInput.ino
+++ b/main/ZsensorGPIOInput.ino
@@ -77,8 +77,7 @@ void MeasureGPIOInput() {
     if (reading != InputState) {
       InputState = reading;
       Log.trace(F("Creating GPIOInput buffer" CR));
-      const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(1);
-      StaticJsonDocument<JSON_MSG_CALC_BUFFER> jsonBuffer;
+      StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
       JsonObject GPIOdata = jsonBuffer.to<JsonObject>();
       if (InputState == HIGH) {
         GPIOdata["gpio"] = "HIGH";
diff --git a/main/ZsensorHCSR501.ino b/main/ZsensorHCSR501.ino
index ea00179..e912f99 100644
--- a/main/ZsensorHCSR501.ino
+++ b/main/ZsensorHCSR501.ino
@@ -41,8 +41,7 @@ void setupHCSR501() {
 
 void MeasureHCSR501() {
   if (millis() > TimeBeforeStartHCSR501) { //let time to init the PIR sensor
-    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(1);
-    StaticJsonDocument<JSON_MSG_CALC_BUFFER> jsonBuffer;
+    StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
     JsonObject HCSR501data = jsonBuffer.to<JsonObject>();
     static int pirState = LOW;
     int PresenceValue = digitalRead(HCSR501_GPIO);