diff --git a/libraries/includes/defines.h b/libraries/includes/defines.h
index 2aca326..b51601c 100644
--- a/libraries/includes/defines.h
+++ b/libraries/includes/defines.h
@@ -8,6 +8,7 @@
 #define LED_GREEN 4
 #define LED_BLUE 45
 
-
+#define SEND_PERIOD 15000 // ms
+#define LABEL_LENGTH 5
 
 #endif /* _DEFINES_H_ */
\ No newline at end of file
diff --git a/sketch/production.cpp b/sketch/production.cpp
index 9bddc1e..9ccca32 100644
--- a/sketch/production.cpp
+++ b/sketch/production.cpp
@@ -6,6 +6,9 @@
 #include <OneWire.h>
 #include <DallasTemperature.h>
 
+#include "HT_SSD1306Wire.h"
+extern SSD1306Wire display;
+
 
 // from config.cpp
 extern config_t myConfig;
@@ -15,7 +18,7 @@ extern config_t myConfig;
 uint16_t userChannelsMask[6]={ 0x00FF,0x0000,0x0000,0x0000,0x0000,0x0000 };
 
 /*LoraWan Class, Class A and Class C are supported*/
-DeviceClass_t  loraWanClass = CLASS_A;
+DeviceClass_t  loraWanClass = CLASS_C;
 
 /*the application data transmission duty cycle.  value in [ms].*/
 uint32_t appTxDutyCycle = 15000;
@@ -54,15 +57,42 @@ uint8_t confirmedNbTrials = 4;
 OneWire oneWire(ONE_WIRE);
 DallasTemperature DS18B20(&oneWire);
 
+bool firstrun = true;
+
+char *labels;
+uint8_t cnt;
+
 /* Prepares the payload of the frame */
 static void prepareTxFrame( uint8_t port )
 {
+  display.clear();
+
   DS18B20.begin();
-  uint8_t cnt = DS18B20.getDS18Count();
+  cnt = DS18B20.getDS18Count();
   Serial.printf("cnt: %d\n\r", cnt);
-  const uint8_t SLOT_WIDTH = 8 + 4; // 8 bytes address, 4 bytes value
-  appDataSize = cnt * SLOT_WIDTH;
+  const uint8_t SLOT_WIDTH = 1 + 8 + 4; // 1 byte statue, 8 bytes address, 4 bytes value
+                                        // status: 00: regular sending
+                                        //         01: very first sending, please send label mapping
+  appDataSize = 1 + (cnt * SLOT_WIDTH);
   uint8_t *buf = appData;
+  char *tmpLabels;
+  if (firstrun) {
+    *buf = 0x01;
+    firstrun = false;
+    labels = (char*) malloc(cnt * (LABEL_LENGTH + 1));
+    memset(labels, 0, cnt * (LABEL_LENGTH + 1));
+    tmpLabels = labels;
+    for (uint8_t i = 0; i < cnt; i++) {
+      snprintf(tmpLabels, LABEL_LENGTH + 1, "Sens%d", i);
+      tmpLabels += (LABEL_LENGTH + 1);
+    }
+  } else {
+    *buf = 0x00;
+  }
+
+  buf++;
+  tmpLabels = labels;
+  uint8_t yline = 0;
   for (uint8_t i = 0; i < cnt; i++) {
     uint8_t *addr = (buf + (i * SLOT_WIDTH));
     uint32_t *value = (uint32_t*) (buf + (i * SLOT_WIDTH) + 8);
@@ -72,16 +102,29 @@ static void prepareTxFrame( uint8_t port )
     DS18B20.requestTemperatures();       // send the command to get temperatures
     *value = DS18B20.getTemp(addr);
     Serial.printf("tempC: %08x\n\r", *value);
+    float tempC = ((float)*value) / 128;
+    char dispbuf[128];
+    sprintf(dispbuf, "%s: %.2f °C", tmpLabels, tempC);
+    tmpLabels += (LABEL_LENGTH + 1);
+    display.drawString(1, yline, dispbuf);
+    yline += 17;
   }
+
+  display.display();
 }
 
 void downLinkDataHandle(McpsIndication_t *mcpsIndication)
 {
   Serial.printf("+REV DATA:%s,RXSIZE %d,PORT %d\r\n",mcpsIndication->RxSlot?"RXWIN2":"RXWIN1",mcpsIndication->BufferSize,mcpsIndication->Port);
   Serial.print("+REV DATA:");
-  for(uint8_t i=0;i<mcpsIndication->BufferSize;i++)
-  {
-    Serial.printf("%02X",mcpsIndication->Buffer[i]);
+
+  if (mcpsIndication->BufferSize != cnt * (LABEL_LENGTH + 1)) {
+    Serial.println("illegal number of octets in downlink message");
+  } else {
+    for(uint8_t i=0;i<mcpsIndication->BufferSize;i++) {
+      Serial.printf("%02X",mcpsIndication->Buffer[i]);
+    } 
+    memcpy(labels, mcpsIndication->Buffer, mcpsIndication->BufferSize);
   }
   Serial.println();
   uint32_t color=mcpsIndication->Buffer[0]<<16|mcpsIndication->Buffer[1]<<8|mcpsIndication->Buffer[2];
@@ -90,62 +133,61 @@ void downLinkDataHandle(McpsIndication_t *mcpsIndication)
 
 
 
-RTC_DATA_ATTR bool firstrun = true;
 
 
 void productionSetup() {
   Serial.println("Starting");
   Mcu.begin();
 
+  digitalWrite(Vext,LOW);
+  display.init();
+  display.setFont(ArialMT_Plain_16);
+  display.clear();
+  display.display();
+
   deviceState = DEVICE_STATE_INIT;
 }
 
 void productionLoop()
 {
+  static uint32_t goingToSleepTime = 0;
+  static uint8_t subStateSleep = 0;
+  static uint32_t myCycleTime = 0;
+
   digitalWrite(LED_GREEN, HIGH);
 
-  switch( deviceState )
-  {
+  if (deviceState != DEVICE_STATE_SLEEP) {
+    Serial.printf("State: %d\n\r", deviceState);
+  }
+  switch( deviceState ) {
     case DEVICE_STATE_INIT:
-    digitalWrite(LED_GREEN, LOW);
-    {
+      digitalWrite(LED_GREEN, LOW);
       LoRaWAN.generateDeveuiByChipID();
       LoRaWAN.init(loraWanClass,loraWanRegion);
       break;
-    }
     case DEVICE_STATE_JOIN:
-    {
       Serial.println("Joining");
       LoRaWAN.join();
       break;
-    }
     case DEVICE_STATE_SEND:
-    digitalWrite(LED_BLUE, HIGH);
-    {
+      digitalWrite(LED_BLUE, HIGH);
       Serial.println("sending");
       prepareTxFrame( appPort );
       LoRaWAN.send();
       deviceState = DEVICE_STATE_CYCLE;
       break;
-    }
     case DEVICE_STATE_CYCLE:
-    digitalWrite(LED_BLUE, LOW);
-    {
+      digitalWrite(LED_BLUE, LOW);
       // Schedule next packet transmission
       txDutyCycleTime = appTxDutyCycle + randr( -APP_TX_DUTYCYCLE_RND, APP_TX_DUTYCYCLE_RND );
       LoRaWAN.cycle(txDutyCycleTime);
       deviceState = DEVICE_STATE_SLEEP;
       break;
-    }
     case DEVICE_STATE_SLEEP:
-    {
       LoRaWAN.sleep(loraWanClass);
       break;
-    }
     default:
-    {
       deviceState = DEVICE_STATE_INIT;
       break;
-    }
   }
 }