diff --git a/src/main.cpp b/src/main.cpp
index 0307a77..4aca889 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -153,9 +153,9 @@ void sendValues() {
     char temperature[8]; sprintf(temperature, "%.2f", bme.readTemperature());
     char humidity[7]; sprintf(humidity, "%.2f", bme.readHumidity());
     char pressure[8]; sprintf(pressure, "%.2f", bme.readPressure() / 100.0F);
-    mqtt.publish(topic_temperature.c_str(), temperature, sizeof(temperature));
-    mqtt.publish(topic_humidity.c_str(), humidity, sizeof(humidity));
-    mqtt.publish(topic_pressure.c_str(), pressure, sizeof(pressure));
+    mqtt.publish(topic_temperature.c_str(), temperature, strlen(temperature));
+    mqtt.publish(topic_humidity.c_str(), humidity, strlen(humidity));
+    mqtt.publish(topic_pressure.c_str(), pressure, strlen(pressure));
 }
 
   if (uv_active) {
@@ -165,9 +165,9 @@ void sendValues() {
     char uvi[10]; sprintf(uvi, "%.2f", uv.readUVI());
     char uva[10]; sprintf(uva, "%.2f", uv.readUVA());
     char uvb[10]; sprintf(uvb, "%.2f", uv.readUVB());
-    mqtt.publish(topic_uvi.c_str(), uvi, sizeof(uvi));
-    mqtt.publish(topic_uvi.c_str(), uvi, sizeof(uva));
-    mqtt.publish(topic_uvi.c_str(), uvi, sizeof(uvb));
+    mqtt.publish(topic_uvi.c_str(), uvi, strlen(uvi));
+    mqtt.publish(topic_uvi.c_str(), uvi, strlen(uva));
+    mqtt.publish(topic_uvi.c_str(), uvi, strlen(uvb));
   }
 
   if (sds_active) {
@@ -177,8 +177,8 @@ void sendValues() {
     char pm10[10]; sprintf(pm10, "%.2f", pm.pm10);
     String topic_pm25 = String("thomas/sensor/") + ota.getMAC() + String("/pm25");
     char pm25[10]; sprintf(pm25, "%.2f", pm.pm25);
-    mqtt.publish(topic_pm10.c_str(), pm10, sizeof(pm10));
-    mqtt.publish(topic_pm25.c_str(), pm25, sizeof(pm25));
+    mqtt.publish(topic_pm10.c_str(), pm10, strlen(pm10));
+    mqtt.publish(topic_pm25.c_str(), pm25, strlen(pm25));
 
       // if you want to just print the measured values, you can use toString() method as well
       Serial.println(pm.toString());
@@ -237,7 +237,7 @@ void setup()
   if (sds_fw.isOk()) {
     sds_active = true;
     sds.setActiveReportingMode();  // ensures sensor is in 'active' reporting mode
-    sds.setCustomWorkingPeriod(5); // sensor sends data every 3 minutes
+//    sds.setCustomWorkingPeriod(5); // sensor sends data every 3 minutes
   } else {
     Serial.println("Failed to communicate with SDS011 sensor, check wiring?");
   }