diff --git a/include/mcp9808.h b/include/mcp9808.h
index 7a694b4..51a3fb4 100644
--- a/include/mcp9808.h
+++ b/include/mcp9808.h
@@ -31,7 +31,7 @@ void init_MCP9808(){
   //  1  1  0   0x1E
   //  1  1  1   0x1F
   if (!tempsensor.begin(0x18)) {
-    Serial.println("Couldn't find MCP9808! Check your connections and verify the address is correct.");
+    Serial.println("MCP9808 not connected!");
     SystemStatus = SystemStatus | MCP9808noReady;
     F_MCP9808 = false;
    
diff --git a/include/mess_BME280.h b/include/mess_BME280.h
index 36e4b5a..e602506 100755
--- a/include/mess_BME280.h
+++ b/include/mess_BME280.h
@@ -10,9 +10,12 @@
 #include "Adafruit_Sensor.h"
 #include "Adafruit_BME280.h"
 uint8_t  BME280_adresse[2] = {0x76, 0x76};
+#ifndef SEALEVELPRESSURE_HPA
 #define SEALEVELPRESSURE_HPA (1013.25f)
+#endif
 //----------------------------------------------------------------
 
+bool F_BME280 = true;
 
 const float No_Val = 999.99;
 float Temp[2] = {No_Val, No_Val};
@@ -58,6 +61,8 @@ if (Anzahl_Sensoren_BME280 > 0) {
    Temperatur_BME = No_Val;
    Luftfeuchte_BME = No_Val;
    Luftdruck_BME = No_Val;
+   Serial.println("BME280 not connected!");
+   F_BME280 = false;
   }
   if (i == 0) { // erster BME
    Temp[0] = Temperatur_BME; // Hier kann die Zuordnung der Sensoren geändert werden
@@ -74,16 +79,29 @@ if (Anzahl_Sensoren_BME280 > 0) {
 }
 
 void M2M_BME280(String deviceId = "4711") {
-    char topic[100];
-    dtostrf(Temp[0],7,1,BME280Data.temperature);
-    sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/temperature_BME_280" );
-    client.publish(topic, BME280Data.temperature, true);
+  char topic[100];
+  dtostrf(Temp[0],7,1,BME280Data.temperature);
+  sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/temperature_BME_280" );
+  client.publish(topic, BME280Data.temperature, true);
 
-    dtostrf(Feuchte[0],7,1,BME280Data.humity);
-    sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/humity_BME280" );
-    client.publish(topic, BME280Data.humity, true);
+  dtostrf(Feuchte[0],7,1,BME280Data.humity);
+  sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/humity_BME280" );
+  client.publish(topic, BME280Data.humity, true);
 
-    dtostrf(L_Druck[0],7,1,BME280Data.pressure);
-    sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/pressure" );
-    client.publish(topic, BME280Data.pressure, true);
+  dtostrf(L_Druck[0],7,1,BME280Data.pressure);
+  sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/pressure" );
+  client.publish(topic, BME280Data.pressure, true);
+}
+void Clear_BME280(String deviceId = "4711"){
+  char topic[100];
+  char test[1] = "";
+  sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/temperature_BME_280" );
+  client.publish(topic,test, false);
+  delay(10);
+  sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/humity_BME280" );
+  client.publish(topic,test, false);
+  delay(10);
+  sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/pressure" );
+  client.publish(topic,test, false);
+  delay(10);
 }
\ No newline at end of file
diff --git a/include/mess_BMP280.h b/include/mess_BMP280.h
index 8e77bc5..5b97c17 100644
--- a/include/mess_BMP280.h
+++ b/include/mess_BMP280.h
@@ -4,12 +4,14 @@
 #include <Adafruit_BMP280.h>
 
 
-#define SEALEVELPRESSURE_HPA (1013.25)  // 1013.25
+#ifndef SEALEVELPRESSURE_HPA
+#define SEALEVELPRESSURE_HPA (1013.25f)
+#endif
 // Richen 219 m über NN
 // Eppingem 195 m über NN
 
 Adafruit_BMP280 bmp; // I2C
-float K_BMP280 = -0.0;
+
 
 bool F_BMP280;
 
@@ -23,15 +25,15 @@ struct {
   
 
 void Init_BMP280(){
-  bool status = bmp.begin(); 
+  bool status = bmp.begin(0x76); 
   F_BMP280 = true; 
   if (!status) {
-    Serial.println("Could not find a valid BME280 sensor, check wiring!");
+    Serial.println("BMP280 not connected!");
     F_BMP280 = false;
     SystemStatus = SystemStatus | BMP280noReady;
+    Serial.print("SensorID was: 0x"); Serial.println(bmp.sensorID(),16);
+    delay(5000);
   } else{
-    /* Serial.print("SensorID was: 0x"); Serial.println(bmp.sensorID(),16);
-    delay(5000); */
     /* Default settings from datasheet. */
     bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,     /* Operating Mode. */
                     Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
@@ -49,14 +51,14 @@ void read_BMP_280() {
   
     Serial.print("Temperature (BMP280):\t");
     float t = bmp.readTemperature();
-    t = t + K_BMP280;
+    t = t + KorrekturTemperatur;
     dtostrf(t,7,1,BMP280Data.temperature);
     Serial.print(BMP280Data.temperature);
     Serial.println(" °C");
 
     Serial.print("Pressure:\t\t");
     float p = bmp.readPressure() / 100.0F;
-    p = p + 13;
+    p = p + KorrekturLuftdruck;
     dtostrf(p,7,1,BMP280Data.pressure);
     Serial.print(BMP280Data.pressure);
     Serial.println(" hPa");
@@ -77,4 +79,17 @@ void M2M_BMP280(String deviceId = "4711") {
     client.publish(topic, BMP280Data.pressure, true);
     sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/approx_altitude" );
     client.publish(topic, BMP280Data.approx_altitud);
+}
+void Clear_BMP280(String deviceId = "4711"){
+  char topic[100];
+  char test[1] = "";
+  sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/temperature_BMP_280" );
+  client.publish(topic,test, false);
+  delay(10);
+  sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/approx_altitude" );
+  client.publish(topic,test, false);
+  delay(10);
+  sprintf(topic, "%s%s%s", "hjk/devices/", deviceId.c_str(), "/telemetry/pressure" );
+  client.publish(topic,test, false);
+  delay(10);
 }
\ No newline at end of file
diff --git a/platformio.ini b/platformio.ini
index dc916fe..7dffd5f 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -51,7 +51,8 @@ build_flags = ${env.build_flags}
     -DTLOWBATT=60
     -DTINTERVAL=10
     -DSpannungsteiler=5.4
-    -DKorrekturLuftdruck=22.58
+    -DKorrekturLuftdruck=23.58
+    -DKorrekturTemperatur=0.0
 
 [env:marcel]   ; Produktivsystem: 
 build_flags = ${env.build_flags}
@@ -69,6 +70,7 @@ build_flags = ${env.build_flags}
     -DTLOWBATT=60
     -DTINTERVAL=10
     -DKorrekturLuftdruck=0.0
+    -DKorrekturTemperatur=0.0
 
 [env:boris]   ; Produktivsystem: 
 build_flags = ${env.build_flags}
@@ -86,6 +88,7 @@ build_flags = ${env.build_flags}
     -DTLOWBATT=60
     -DTINTERVAL=5
     -DKorrekturLuftdruck=0.0
+    -DKorrekturTemperatur=0.0
 
 [env:hjk]
 build_flags = ${env.build_flags}
@@ -104,6 +107,7 @@ build_flags = ${env.build_flags}
     -DTINTERVAL=10
     -DSpannungsteiler=5.4
     -DKorrekturLuftdruck=23.58
+    -DKorrekturTemperatur=0.0
 
 [env:filamentbox]
 build_flags = ${env.build_flags}
@@ -121,4 +125,5 @@ build_flags = ${env.build_flags}
     -DTLOWBATT=60
     -DTINTERVAL=15
     -DKorrekturLuftdruck=0.0
+    -DKorrekturTemperatur=0.0
 
diff --git a/src/main.cpp b/src/main.cpp
index ce55251..5652cb1 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -25,7 +25,8 @@ PubSubClient client(espClient);
 
 #include<mess_htu21.h>
 
-//#include <mess_BMP280.h>
+#include <mess_BMP280.h>
+
 #include <mess_BME280.h>
 
 #include <mess_Ub_old.h>
@@ -48,7 +49,7 @@ IPAddress dns;
 IPAddress secondaryDNS(8, 8, 8, 8);
 
 
-const char* mqtt_fprint = "a3:44:1d:aa:6e:e5:c7:55:02:20:98:ea:9b:df:1a:42:a2:f3:e3:0d";
+//const char* mqtt_fprint = "a3:44:1d:aa:6e:e5:c7:55:02:20:98:ea:9b:df:1a:42:a2:f3:e3:0d";
 const char* mqtt_user =   "mqtt";
 const char* mqtt_pass =   "fische";
 
@@ -93,7 +94,7 @@ void setup() {
   delay(500);
   #if (MQTT == 0)
   init_HTU21();
-  //Init_BMP280();
+  Init_BMP280();
   Sensor_BME280();
 
   init_MCP9808();
@@ -115,12 +116,16 @@ void setup() {
   if (F_ADS1115 == true){
     MessungADS();
   }
-  /* if (F_BMP280 == true){
+  if (F_BMP280 == true){
     read_BMP_280();
-  }*/
+  }
   if (F_MCP9808 == true){
     valTemp = getTemperature_MCP9808();
   }
+  if (!F_BME280 == true){
+    Serial.println("Topic BME280 löschen!");
+    Clear_BME280(hostname.c_str());
+  }
   setup_wifi();  // ca. 4,5 s
   deviceId = ESP.getChipId();
   sprintf(sID, "%010ld", deviceId);
@@ -131,6 +136,14 @@ void setup() {
   client.setServer(mqtt_server, mqtt_port);
   client.setCallback(callback);
   Serial.printf("Systemstatus : 0x%02x \n", SystemStatus);
+  if (!F_BME280 == true){
+    Serial.println("Topic BME280 löschen!");
+    Clear_BME280(hostname.c_str());
+  }
+  if (!F_BMP280 == true){
+    Serial.println("Topic BMP280 löschen!");
+    Clear_BME280(hostname.c_str());
+  }
   //----------
   
 }
@@ -152,8 +165,9 @@ void loop() {
     }
     
     if (F_HTU_21D) M2M_HTU21D(hostname.c_str());
-    M2M_BME280(hostname.c_str());
+    if (F_BME280) M2M_BME280(hostname.c_str());
     if (F_MCP9808) M2M_Temperatur_MCP9808(hostname.c_str());
+    if (F_BMP280) M2M_BMP280(hostname.c_str());
     sprintf(msg,"%ld", Feldstaerke);
     sprintf(topic, "%s%s%s", "hjk/devices/", hostname.c_str(), "/telemetry/RSSI" );
     client.publish(topic, msg, true);