diff --git a/sketch/production.cpp b/sketch/production.cpp
index 082734b..53ca165 100644
--- a/sketch/production.cpp
+++ b/sketch/production.cpp
@@ -89,12 +89,13 @@ static void prepareTxFrame( uint8_t port )
       struct { 
         uint16_t status;
         uint64_t addrs[NUM_OF_SENSORS];
-      } msg;
+      } __attribute__((packed)) msg;
       msg.status = ERR_START_UP;
       for (uint8_t i = 0; i < NUM_OF_SENSORS; i++) {
         msg.addrs[i] = sensors[i].addr;
       }
       appDataSize = sizeof(msg);
+      Serial.printf("appDataSize: %ld\n\r", appDataSize);
       memcpy(&appData, (void*)&msg, appDataSize);
       display.drawString(1, 0, "Start up");
       Serial.println("Start up message send");
@@ -106,19 +107,22 @@ static void prepareTxFrame( uint8_t port )
         struct {
           uint64_t addr;
           int32_t value;
-        } sensors[NUM_OF_SENSORS];
-      } msg;
+        } __attribute__((packed)) sensors[NUM_OF_SENSORS];
+      } __attribute__((packed)) msg;
       msg.status = (DS18B20.getDS18Count() == NUM_OF_SENSORS) ? errorCode : errorCode | ERR_SENSOR_LOST;
       DS18B20.requestTemperatures();
       for (uint8_t i = 0; i < NUM_OF_SENSORS; i++) {
         msg.sensors[i].addr = sensors[i].addr;
-        msg.sensors[i].value = DS18B20.getTemp((const uint8_t*)&(sensors[i].addr));
+        Serial.printf("%d: %s: %016llx\n\r", i, sensors[i].label, sensors[i].addr);
+        msg.sensors[i].value = DS18B20.getTemp(((const uint8_t*)(&(sensors[i].addr))));
+        Serial.printf("v: %08x\n\r", msg.sensors[i].value);
 
         float tempC = ((float)msg.sensors[i].value) / 128;
+        Serial.printf("f: %.2f\n\r", tempC);
         char dispbuf[128];
         sprintf(dispbuf, "%s: %.2f °C", sensors[i].label, tempC);
-        display.drawString(1, i * 17, dispbuf);
-        Serial.printf("%d, %08x, %s, %.2f\n\r", sensors[i].index, sensors[i].addr, sensors[i].label, tempC);
+        display.drawString(1, i * 16, dispbuf);
+        Serial.printf("%d, %016llx, %s, %.2f\n\r", sensors[i].index, sensors[i].addr, sensors[i].label, tempC);
       }
       appDataSize = sizeof(msg);
       memcpy(&appData, (void*)&msg, appDataSize);
@@ -129,7 +133,7 @@ static void prepareTxFrame( uint8_t port )
 
     errorCode = ERR_OK;
   } else {
-    appDataSize = 1;
+    appDataSize = 2;
     appData[0] = errorCode;
   }
 }
@@ -188,14 +192,16 @@ void productionSetup() {
   uint8_t cnt = DS18B20.getDS18Count();
   if (cnt != 4) {
     display.drawString(1, 0, "invalid number of sensors");
+    Serial.println("invalid number of sensors");
     errorCode = ERR_INVALID_NUM_OF_SENSORS;
   } else {
     for (uint8_t i = 0; i < NUM_OF_SENSORS; i++) {
       sprintf(sensors[i].label, "Sens%d", i);
-      DS18B20.getAddress((uint8_t*)&(sensors[i].addr), i);
+      DS18B20.getAddress(((uint8_t*)(&(sensors[i].addr))), i);
       char buf[128];
-      sprintf(buf, "%s: %08x", sensors[i].label, sensors[i].addr);
-      display.drawString(1, i*16, buf);
+      sprintf(buf, "%d: %s: %016llx", i, sensors[i].label, sensors[i].addr);
+      Serial.println(buf);
+      //display.drawString(1, i*16, buf);
       sensors[i].index = 0;
     }
   }
diff --git a/snippets/decoding2.txt b/snippets/decoding2.txt
new file mode 100644
index 0000000..2ab22af
--- /dev/null
+++ b/snippets/decoding2.txt
@@ -0,0 +1,35 @@
+0: Sens0: 000000006a4f8c28
+1: Sens1: 000000000ac31928
+2: Sens2: 000000006a863528
+3: Sens3: 00000000f611c728
+
+
+
+struct { 
+  uint16_t status;
+  uint64_t addrs[NUM_OF_SENSORS];
+} __attribute__((packed)) msg;
+
+04 00  0000 3802 033C 288C  4F6A 0D00 0094 2819  C30A 0D00 00B4 2835  866A 0D00 00D4 28C7  11F6622001B8
+
+0400  288C 4F6A 0D00 0094  2819 C30A 0D00 00B4  2835 866A 0D00 00D4  28C7 11F6 6220 01B8
+
+
+
+struct {
+  uint16_t status;
+  struct {
+    uint64_t addr;
+    int32_t value;
+  } __attribute__((packed)) sensors[NUM_OF_SENSORS];
+} __attribute__((packed)) msg;
+
+0000
+288C 4F6A 0D00 0094 
+9808 0000 
+2819 C30A 0D00 00B4 
+E008 0000 
+2835 866A 0D00 00D4 
+D008 0000 
+28C7 11F6 6220 01B8
+9808 0000
\ No newline at end of file