set mqtt sensor data as retained messages

src/main.cpp

     }
 
     if (found_bme1) {
-        mqtt.publish(SENSOR_LOCATION "/temperature", String(bme1_temp()).c_str());
-        mqtt.publish(SENSOR_LOCATION "/humidity", String(bme1_humid()).c_str());
-        mqtt.publish(SENSOR_LOCATION "/pressure", String(bme1_pressure()).c_str());
+        mqtt.publish(SENSOR_LOCATION "/temperature", String(bme1_temp()).c_str(), true);
+        mqtt.publish(SENSOR_LOCATION "/humidity", String(bme1_humid()).c_str(), true);
+        mqtt.publish(SENSOR_LOCATION "/pressure", String(bme1_pressure()).c_str(), true);
     } else if (found_bme2) {
-        mqtt.publish(SENSOR_LOCATION "/temperature", String(bme2_temp()).c_str());
-        mqtt.publish(SENSOR_LOCATION "/humidity", String(bme2_humid()).c_str());
-        mqtt.publish(SENSOR_LOCATION "/pressure", String(bme2_pressure()).c_str());
+        mqtt.publish(SENSOR_LOCATION "/temperature", String(bme2_temp()).c_str(), true);
+        mqtt.publish(SENSOR_LOCATION "/humidity", String(bme2_humid()).c_str(), true);
+        mqtt.publish(SENSOR_LOCATION "/pressure", String(bme2_pressure()).c_str(), true);
     } else if (found_sht) {
-        mqtt.publish(SENSOR_LOCATION "/temperature", String(sht_temp()).c_str());
-        mqtt.publish(SENSOR_LOCATION "/humidity", String(sht_humid()).c_str());
+        mqtt.publish(SENSOR_LOCATION "/temperature", String(sht_temp()).c_str(), true);
+        mqtt.publish(SENSOR_LOCATION "/humidity", String(sht_humid()).c_str(), true);
     }
 
 #ifdef ENABLE_CCS811
     if (found_ccs1) {
-        mqtt.publish(SENSOR_LOCATION "/eco2", String(ccs1_eco2()).c_str());
-        mqtt.publish(SENSOR_LOCATION "/tvoc", String(ccs1_tvoc()).c_str());
+        mqtt.publish(SENSOR_LOCATION "/eco2", String(ccs1_eco2()).c_str(), true);
+        mqtt.publish(SENSOR_LOCATION "/tvoc", String(ccs1_tvoc()).c_str(), true);
     } else if (found_ccs2) {
-        mqtt.publish(SENSOR_LOCATION "/eco2", String(ccs2_eco2()).c_str());
-        mqtt.publish(SENSOR_LOCATION "/tvoc", String(ccs2_tvoc()).c_str());
+        mqtt.publish(SENSOR_LOCATION "/eco2", String(ccs2_eco2()).c_str(), true);
+        mqtt.publish(SENSOR_LOCATION "/tvoc", String(ccs2_tvoc()).c_str(), true);
     }
 #endif // ENABLE_CCS811
 }