fix bug with big difference

MiniBeieliNodeSketch/MiniBeieliNodeSketch.ino

@@ -12,7 +12,7 @@ BME280 bme280;
 /******************************************************************************/
 /* Firmware Version                                                           */
 /******************************************************************************/
-static const int32_t fwVersion = 20210426;
+static const int32_t fwVersion = 20210427;
 
 /******************************************************************************/
 /* LoraWAN Settings                                                           */
@@ -850,12 +850,14 @@ void AddSensorDataToLoraData()
     timer_pos0 = millis();
   }
   my_position++;
-
-  last_sensor_reading = sensor_data;
 }
 
 bool TooBigWeightChange()
 {
+  // on first position there cannot be a difference 
+  if (my_position == 1) {
+     return false;
+  }
   bool big_difference = (abs(last_sensor_reading.weight - sensor_data.weight) > SEND_DIFF_THRESHOLD_5GRAMS);
   if (big_difference) {
     lora_data.weight_last = sensor_data.weight;
@@ -907,6 +909,7 @@ bool ReadSensors(bool read_only)
   if (!read_only) {
     AddSensorDataToLoraData();
     send_data = (TooBigWeightChange()) || (my_position >= MAX_VALUES_TO_SEND) || (iteration <= INIT_PACKETS) || (iteration % INIT_PACKAGE_INTERVAL == 0);
+    last_sensor_reading = sensor_data;
  
     if (config_data.debug_level > 0) {
       if (send_data) {

README.md

@@ -67,5 +67,5 @@ $ mkdir ~/arduino-builds-saved/20210423/
 $ cp /tmp/arduino-sketch-0870BAA82DFEB3C4E076C8FBBDEB25B4/CubeCell_Board_REGION_EU868_RGB_0.cyacd ~/arduino-builds-saved/20210423/
 
 Upload:
-/home/joerg/Arduino/hardware/CubeCell/CubeCell/tools/CubeCellflash/CubeCellflash -serial /dev/ttyUSB0 /home/joerg/arduino-builds-saved/20210423/CubeCell_Board_REGION_EU868_RGB_0.cyacd
+/home/joerg/Arduino/hardware/CubeCell/CubeCell/tools/CubeCellflash/CubeCellflash -serial /dev/ttyUSB0 /home/joerg/arduino-builds-saved/latest/CubeCell_Board_REGION_EU868_RGB_0.cyacd
 `

mini-beieli-provision-cubecell.go

@@ -58,6 +58,51 @@ func readSerial(p *serial.Port) {
 	}
 }
 
+func getAppKey(deveui string) string {
+	if len(deveui) == 16 {
+		appkey := fmt.Sprintf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c",
+			deveui[10],
+			deveui[3],
+			deveui[4],
+			deveui[7],
+			deveui[15],
+			deveui[9],
+			deveui[11],
+			deveui[2],
+			deveui[0],
+			deveui[8],
+			deveui[1],
+			deveui[6],
+			deveui[5],
+			deveui[12],
+			deveui[14],
+			deveui[13],
+			deveui[3],
+			deveui[6],
+			deveui[12],
+			deveui[7],
+			deveui[15],
+			deveui[1],
+			deveui[9],
+			deveui[11],
+			deveui[2],
+			deveui[10],
+			deveui[0],
+			deveui[8],
+			deveui[5],
+			deveui[14],
+			deveui[4],
+			deveui[13])
+
+		fmt.Printf("calculated AppKey: %s\n", appkey)
+		return appkey
+
+	} else {
+		fmt.Printf("devEui has wrong length: %s\n", deveui)
+		return ""
+	}
+}
+
 func main() {
 	if len(os.Args) != 3 {
 		fmt.Println("usage: " + filepath.Base(os.Args[0]) + " <SerialDevice> <appEui>")
@@ -75,10 +120,11 @@ func main() {
 
 	sendCommand(s, "AT+XXX")
 	devEui := getDevEui(s)
+	appKey := getAppKey(devEui)
 	if devEui != "" {
 		sendCommand(s, "AT+DevEui="+devEui)
 		sendCommand(s, "AT+AppEui="+appEui)
-		sendCommand(s, "AT+AppKey="+devEui+devEui)
+		sendCommand(s, "AT+AppKey="+appKey)
 		sendCommand(s, "AT+SAVE_OTAA_CONFIG=1")
 		sendCommand(s, "AT+RESET=1")
 		readSerial(s)