diff --git a/src/main.cpp b/src/main.cpp
index cd0d4c7..5f5c547 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -503,16 +503,16 @@ void sendValues() {
     String topic_temperature = String("thomas/sensor/") + ota.getMAC() + String("/temperature");
     String topic_humidity = String("thomas/sensor/") + ota.getMAC() + String("/humidity");
     String topic_pressure = String("thomas/sensor/") + ota.getMAC() + String("/pressure");
-    mqtt.publish(topic_temperature.c_str(), sensor_readings.temperature, "%.2f");
+    mqtt.publishf(topic_temperature.c_str(), "%.2f", sensor_readings.temperature);
     delay(10);
-    mqtt.publish(topic_humidity.c_str(), sensor_readings.humidity, "%.2f");
+    mqtt.publishf(topic_humidity.c_str(), "%.2f", sensor_readings.humidity);
     delay(10);
-    mqtt.publish(topic_pressure.c_str(), sensor_readings.pressure, "%.2f");
+    mqtt.publishf(topic_pressure.c_str(), "%.2f", sensor_readings.pressure);
     delay(10);
   }
   if (bme680_active) {
     String topic_voc = String("thomas/sensor/") + ota.getMAC() + String("/voc");
-    mqtt.publish(topic_voc.c_str(), sensor_readings.voc / 1000.0F, "%.2f");
+    mqtt.publishf(topic_voc.c_str(), "%.2f", sensor_readings.voc / 1000.0F);
     delay(10);
   }
   if (!bme280_active && !bme680_active) {
@@ -527,35 +527,35 @@ void sendValues() {
     String topic_uvi = String("thomas/sensor/") + ota.getMAC() + String("/uvi");
     String topic_uva = String("thomas/sensor/") + ota.getMAC() + String("/uva");
     String topic_uvb = String("thomas/sensor/") + ota.getMAC() + String("/uvb");
-    mqtt.publish(topic_uvi.c_str(), sensor_readings.uvi, "%.2f");
-    mqtt.publish(topic_uva.c_str(), sensor_readings.uva, "%.2f");
-    mqtt.publish(topic_uvb.c_str(), sensor_readings.uvb, "%.2f");
+    mqtt.publishf(topic_uvi.c_str(), "%.2f", sensor_readings.uvi);
+    mqtt.publishf(topic_uva.c_str(), "%.2f", sensor_readings.uva);
+    mqtt.publishf(topic_uvb.c_str(), "%.2f", sensor_readings.uvb);
     delay(10);
   }
 
   if (light_active) {
     String topic_lux = String("thomas/sensor/") + ota.getMAC() + String("/lux");
-    mqtt.publish(topic_lux.c_str(), sensor_readings.lux, "%.2f");
+    mqtt.publishf(topic_lux.c_str(), "%.2f", sensor_readings.lux);
     delay(10);
   }
 
   if (sds_active) {
     String topic_pm10 = String("thomas/sensor/") + ota.getMAC() + String("/pm10");
     String topic_pm25 = String("thomas/sensor/") + ota.getMAC() + String("/pm25");
-    mqtt.publish(topic_pm10.c_str(), sensor_readings.pm10, "%.2f");
-    mqtt.publish(topic_pm25.c_str(), sensor_readings.pm25, "%.2f");
+    mqtt.publishf(topic_pm10.c_str(), "%.2f", sensor_readings.pm10);
+    mqtt.publishf(topic_pm25.c_str(), "%.2f", sensor_readings.pm25);
     delay(10);
   }
 
   {
     String topic_battery = String("thomas/sensor/") + ota.getMAC() + String("/battery");
-    mqtt.publish(topic_battery.c_str(), (sensor_readings.battery/4096.0)*2*3.42, "%.2f");
+    mqtt.publishf(topic_battery.c_str(), "%.2f", (sensor_readings.battery/4096.0)*2*3.42);
     delay(10);
   }
 
   {
     String topic_rssi = String("thomas/sensor/") + ota.getMAC() + String("/rssi");
-    mqtt.publish(topic_rssi.c_str(), sensor_readings.rssi, "%d");
+    mqtt.publishf(topic_rssi.c_str(), "%d", sensor_readings.rssi);
     delay(10);
   }
 
diff --git a/src/network/XD0MQTT.cpp b/src/network/XD0MQTT.cpp
index 65e2400..339ad12 100644
--- a/src/network/XD0MQTT.cpp
+++ b/src/network/XD0MQTT.cpp
@@ -122,9 +122,26 @@ bool XD0MQTT::publish(const char* topic, const char* data, int len, int qos, int
   ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);
 }
 
-bool XD0MQTT::publish(const char* topic, const float data, const char* format, int qos, int retain) {
+bool XD0MQTT::publishf(const char* topic, const char* format, ...) {
+  va_list argptr;
+  va_start(argptr, format);
+  bool ret = publishf2(topic, 1, 0, format, argptr);
+  va_end(argptr);
+  return ret;
+
+}
+
+bool XD0MQTT::publishf2(const char* topic, int qos, int retain, const char* format, ...) {
+  va_list argptr;
+  va_start(argptr, format);
+  bool ret = publishf2(topic, qos, retain, format, argptr);
+  va_end(argptr);
+  return ret;
+}
+
+bool XD0MQTT::publishf2(const char* topic, int qos, int retain, const char* format, va_list argp) {
   char data_str[64];
-  sprintf(data_str, format, data);
+  vsprintf(data_str, format, argp);
   int msg_id = esp_mqtt_client_publish(client, topic, data_str, strlen(data_str), qos, retain);
   ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);
 }
diff --git a/src/network/XD0MQTT.h b/src/network/XD0MQTT.h
index 54d64a2..1f0fba5 100644
--- a/src/network/XD0MQTT.h
+++ b/src/network/XD0MQTT.h
@@ -30,7 +30,9 @@ class XD0MQTT {
     XD0MQTT(void);
     bool begin(void);
     bool publish(const char* topic, const char* data, int len, int qos=1, int retain=0);
-    bool publish(const char* topic, const float data, const char* format, int qos=1, int retain=0);
+    bool publishf(const char* topic, const char* format, ...);
+    bool publishf2(const char* topic, int qos, int retain, const char* format, ...);
+    bool publishf2(const char* topic, int qos, int retain, const char* format, va_list argp);
     bool subscribe(const char* topic, const cb_t &cb, int qos=1);
     bool unsubscribe(const char* topic);
     esp_err_t mqtt_event_handler_cb(esp_mqtt_event_handle_t event);