some changes

README.md

@@ -3,3 +3,73 @@
 Code fuer den LoraWAN Node
 
 Autor: Joerg Lehmann, nbit Informatik GmbH
+
+| Parameter         | Value                       |
+| ----------------- | --------------------------- |
+| Board             | MCCI Catena 4610            |
+| LoraWAN Subband   | "Default, works everywhere" |
+| Serial interface  | Generic Serial              | 
+| LoraWAN Network   | Swisscom                    |
+| System Clock      | 24 MHz                      |
+| LoraWAN Region    | Europe 868 MHz              |
+| Optimize          | Smallest (-Os default)      |
+
+Das sind die verwendeten Libraries [1]:
+
+| URL | Commit | Commit Date |
+| --- | -----  | ----------- |
+| https://github.com/mcci-catena/Adafruit_BME280_Library.git  | 3dafbe1 | Wed, 13 Dec 2017 13:56:30 -0500  |
+| https://github.com/mcci-catena/Adafruit_Sensor.git  | f2af6f4 | Tue, 1 Sep 2015 15:57:59 +0200  |
+| https://github.com/mcci-catena/arduino-lmic.git  | 9191f0c | Tue, 30 Jun 2020 09:56:19 -0400  |
+| https://github.com/mcci-catena/arduino-lorawan.git  | 4bc0d48 | Sat, 9 May 2020 12:38:28 -0400  |
+| https://github.com/mcci-catena/Catena-Arduino-Platform.git  | 7620a89 | Fri, 31 Jul 2020 14:14:30 -0400  |
+| https://github.com/mcci-catena/Catena-mcciadk.git  | a428006 | Sat, 21 Dec 2019 20:45:26 -0500  |
+| https://github.com/mcci-catena/MCCI_FRAM_I2C.git  | f0a5ea5 | Sat, 21 Dec 2019 16:17:01 -0500  |
+| https://github.com/tatobari/Q2-HX711-Arduino-Library.git  | ccda8d8 | Wed, 13 Mar 2019 12:41:44 -0300  |
+| https://github.com/sparkfun/SparkFun_Qwiic_Scale_NAU7802_Arduino_Library.git  | 688f255 | Fri, 3 Jan 2020 12:35:22 -0700  |
+| https://github.com/mcci-catena/OneWire.git  | d814a7b | Thu, 26 Apr 2018 03:45:27 +0800  |
+| https://github.com/mcci-catena/SHT1x.git  | be7042c | Tue, 20 Sep 2011 13:56:23 +1000  |
+
+
+
+Patch arduino-lmic, so initial SF12 is used initially:
+
+`
+[joerg@cinnamon src]$ git diff
+diff --git a/src/lmic/lmic_bandplan_eu868.h b/src/lmic/lmic_bandplan_eu868.h
+index efff7d5..74efb37 100644
+--- a/src/lmic/lmic_bandplan_eu868.h
++++ b/src/lmic/lmic_bandplan_eu868.h
+@@ -61,7 +61,7 @@ LMICeu868_isValidBeacon1(const uint8_t *d) {
+ #undef LMICbandplan_isFSK
+ #define LMICbandplan_isFSK()    (/* RX datarate */LMIC.dndr == EU868_DR_FSK)
+ 
+-#define LMICbandplan_getInitialDrJoin() (EU868_DR_SF7)
++#define LMICbandplan_getInitialDrJoin() (EU868_DR_SF12)
+ 
+ void LMICeu868_setBcnRxParams(void);
+ #define LMICbandplan_setBcnRxParams()   LMICeu868_setBcnRxParams()
+`
+
+`[1]:
+[joerg@cinnamon libraries]$ for i in Adafruit_BME280_Library Adafruit_Sensor arduino-lmic arduino-lorawan Catena-Arduino-Platform Catena-mcciadk MCCI_FRAM_I2C Q2-HX711-Arduino-Library SparkFun_Qwiic_Scale_NAU7802_Arduino_Library OneWire SHT1x ; do cd $i; echo "| $(git remote -v |grep fetch |awk '{print $2}' |tr '\n' ' ') | $(git log --pretty=format:'%h | %cD ' -n 1) |" ; cd ..; done`
+
+
+## Some Facts about RSSI and SNR
+
+https://lora.readthedocs.io/en/latest/#rssi
+
+RSSI minimum = -120 dBm.
+
+RSSI < -90 dBm: this signal is extremely weak, at the edge of what a receiver can receive.
+RSSI -67dBm: this is a fairly strong signal.
+RSSI > -55dBm: this is a very strong signal.
+RSSI > -30dBm: your sniffer is sitting right next to the transmitter.
+
+https://lora.readthedocs.io/en/latest/#snr
+
+Typical LoRa SNR values are between: -20dB and +10dB
+
+A value closer to +10dB means the received signal is less corrupted.
+
+LoRa can demodulate signals which are -7.5 dB to -20 dB below the noise floor.

helper.h

@@ -0,0 +1,78 @@
+#ifndef _HELPER_H_
+#define _HELPER_H
+
+#pragma once
+
+#ifndef _CATENA_H_
+#include <Catena.h>
+#endif
+
+using namespace McciCatena;
+
+// the primary object
+Catena gCatena;
+
+
+//Following functions are based on "https://github.com/dndubins/QuickStats", by David Dubins
+
+void bubbleSort(long A[], int len) {
+  unsigned long newn;
+  unsigned long n = len;
+  long temp = 0;
+  do {
+    newn = 1;
+    for (int p = 1; p < len; p++) {
+      if (A[p - 1] > A[p]) {
+        temp = A[p];         //swap places in array
+        A[p] = A[p - 1];
+        A[p - 1] = temp;
+        newn = p;
+      } //end if
+    } //end for
+    n = newn;
+  } while (n > 1);
+}
+
+long median(long samples[], int m) //calculate the median
+{
+  //First bubble sort the values: https://en.wikipedia.org/wiki/Bubble_sort
+  long sorted[m];   // Define and initialize sorted array.
+  long temp = 0;    // Temporary float for swapping elements
+
+  for (int i = 0; i < m; i++) {
+    sorted[i] = samples[i];
+  }
+  bubbleSort(sorted, m); // Sort the values
+
+  if (bitRead(m, 0) == 1) { //If the last bit of a number is 1, it's odd. This is equivalent to "TRUE". Also use if m%2!=0.
+    return sorted[m / 2]; //If the number of data points is odd, return middle number.
+  } else {
+    return (sorted[(m / 2) - 1] + sorted[m / 2]) / 2; //If the number of data points is even, return avg of the middle two numbers.
+  }
+}
+
+// Joergs STDDEV
+float stddev(long samples[], int m) //calculate the stdandard deviation
+{
+  float sum_x;
+  float sum_x2;
+  float mean;
+
+  float stdev;
+  sum_x = 0;
+  sum_x2 = 0;
+
+  for (int i = 0; i < m; i++) {
+    sum_x = sum_x + samples[i];
+  }
+  mean = sum_x / m;
+
+  for (int i = 0; i < m; i++) {
+    sum_x2 = sum_x2 + ((samples[i] - mean) * (samples[i] - mean));
+  }
+
+  stdev = sqrt(sum_x2 / m);
+
+  return stdev;
+}
+#endif

mini_beieli_node.h

@@ -14,11 +14,11 @@ enum {
   // Actual time will be a little longer because have to
   // add measurement and broadcast time, but we attempt
   // to compensate for the gross effects below.
-  CATCFG_T_CYCLE = 6 * 60, // every 6 minutes
-  //CATCFG_T_CYCLE = 30, // for Testing
-  CATCFG_T_CYCLE_TEST = 30, // every 10 seconds
-  CATCFG_T_CYCLE_INITIAL = 30,    // every 30 seconds initially
-  CATCFG_INTERVAL_COUNT_INITIAL = 30,     // repeat for 15 minutes
+  CATCFG_T_CYCLE = 6 * 60,                // every 6 minutes
+  //CATCFG_T_CYCLE = 30,                  // for Testing (Swisscom Compliance)
+  CATCFG_T_CYCLE_TEST = 30,               // every 30 seconds
+  CATCFG_T_CYCLE_INITIAL = 30,            // every 30 seconds initially
+  CATCFG_INTERVAL_COUNT_INITIAL = 10,     // repeat for 5 minutes
   CATCFG_T_REBOOT = 30 * 24 * 60 * 60,    // reboot every 30 days
 };
 
@@ -26,7 +26,7 @@ enum {
 enum {
   CATCFG_T_WARMUP = 1,
   CATCFG_T_SETTLE = 5,
-  CATCFG_T_OVERHEAD = (CATCFG_T_WARMUP + CATCFG_T_SETTLE),
+  CATCFG_T_OVERHEAD = (CATCFG_T_WARMUP + CATCFG_T_SETTLE + 4),
   CATCFG_T_MIN = CATCFG_T_OVERHEAD,
   CATCFG_T_MAX = CATCFG_T_CYCLE < 60 * 60 ? 60 * 60 : CATCFG_T_CYCLE,     // normally one hour max.
   CATCFG_INTERVAL_COUNT = 30,
@@ -56,7 +56,7 @@ enum {
   |
   \****************************************************************************/
 
-static const int32_t fwVersion = 20200207;
+static const int32_t fwVersion = 20200804;
 
 static const byte INIT_PACKAGE_INTERVAL = 100;  // send an init package every 100 packages;
 static const byte MAX_VALUES_TO_SEND = 8;
@@ -64,16 +64,19 @@ static const byte MAX_VALUES_TO_SEND = 8;
 static const uint8_t LORA_DATA_VERSION = 1;
 static const uint8_t LORA_DATA_VERSION_FIRST_PACKAGE = 128;
 static const uint32_t PRESSURE_OFFSET = 825;
-static const uint16_t SEND_DIFF_THRESHOLD_5GRAMS = 10;   // when weight value drops by 50g, then send data
+static const uint16_t SEND_DIFF_THRESHOLD_5GRAMS = 20;   // when weight changes by 100g, then send data
+static const long NOT_PLAUSIBLE_16 = 65535;
+static const long NOT_PLAUSIBLE_32 = 2147483647;
+static const byte INIT_PACKETS = 5;
 
-// must be 139 bytes long (size of kBme680Cal)
+// must be 64 bytes long (size of kAppConf)
 typedef struct {
-  long cal_w1_0;                                     // 4 Bytes, Wert Waegezelle 1 ohne Gewicht
-  long cal_w2_0;                                     // 4 Bytes, Wert Waegezelle 2 ohne Gewicht
+  long cal_w1_0;                                     // 4 Bytes, Wert Waegezelle 1 ohne Gewicht, LONG_MIN when not connected
+  long cal_w2_0;                                     // 4 Bytes, Wert Waegezelle 2 ohne Gewicht, LONG_MIN when not connected
   float cal_w1_factor;                               // 4 Bytes, Kalibrationsfaktor Waegezelle 1
   float cal_w2_factor;                               // 4 Bytes, Kalibrationsfaktor Waegezelle 2
   byte debug_level;                                  // 0 => no debugging, no led, 1 => infos, no led, 2 => infos, 3 => error, 4 => highest level
-  byte fill[122];
+  byte fill[47];
 } __attribute__((packed)) CONFIG_data;
 
 typedef struct {

mini_beieli_node_hx711.h

@@ -0,0 +1,94 @@
+#define SAMPLES 10
+
+#include <Q2HX711.h>
+
+#ifndef _HELPER_H_
+#include "helper.h"
+#endif
+
+// Scales
+Q2HX711 hx711(A1, A0);
+
+byte debug_level;
+
+void SetScalesDebugLevel(byte dbg_level)
+{
+  debug_level = dbg_level;
+}
+
+bool SetupScales(byte dbg_level)
+{
+  debug_level = dbg_level;
+  if (debug_level > 0) {
+    gCatena.SafePrintf("setup_scales\n");
+  }
+
+  bool res;
+  res = true;
+
+  // Use D10 to regulate power
+  pinMode(D10, OUTPUT);
+
+  if (debug_level > 0) {
+    gCatena.SafePrintf("setup_scale done\n");
+  }
+
+  return res;
+}
+
+long ReadScale(char channel)
+{
+  if (channel == 'B') {
+    hx711.setGain(128);
+  } else {
+    hx711.setGain(32);
+  }
+  delay(500);
+
+  long res;
+  int const num_scale_readings = 25; // number of instantaneous scale readings to calculate the median
+
+  // we use the median, not the average, see https://community.particle.io/t/boron-gpio-provides-less-current-than-electrons-gpio/46647/13
+  long readings[num_scale_readings];  // create arry to hold readings
+
+  if (debug_level > 0) {
+    gCatena.SafePrintf("my_read_average, measurements:\n");
+  }
+
+  for (int i = 0; i < num_scale_readings; i++) {
+    readings[i] = hx711.read();  // fill the array with instantaneous readings from the scale
+    if (debug_level > 1) {
+      gCatena.SafePrintf("Reading %d: %d\n", i, readings[i]);
+    }
+  }
+
+  res = median(readings, num_scale_readings); // calculate median
+
+  if (debug_level > 0) {
+    gCatena.SafePrintf("Median of %d samples: %d\n", num_scale_readings, res);
+    float sdev;
+    sdev = stddev(readings, num_scale_readings);
+    gCatena.SafePrintf("Standard Deviation: %d.%03d\n", (int)sdev, (int)abs(sdev * 1000) % 1000);
+  }
+
+  return res;
+}
+
+void PowerdownScale()
+{
+  // Disable Power
+  digitalWrite(D10, LOW);
+}
+
+void PowerupScale()
+{
+  // Enable Power
+  digitalWrite(D10, HIGH);
+
+  // we wait 400ms (settling time according HX711 datasheet @ 10 SPS
+  delay(400);
+
+  if (debug_level > 0) {
+    gCatena.SafePrintf("setup_scale done\n");
+  }
+}

mini_beieli_node_nau7802.h

@@ -0,0 +1,174 @@
+#pragma once
+
+#include <Wire.h>
+
+#ifndef _HELPER_H_
+#include "helper.h"
+#endif
+
+#include "SparkFun_Qwiic_Scale_NAU7802_Arduino_Library.h"
+
+#define SAMPLES 5
+
+
+byte debug_level;
+
+//byte interruptPin = A0;
+
+void SetScalesDebugLevel(byte dbg_level)
+{
+  debug_level = dbg_level;
+}
+
+bool InitializeScales()
+{
+  bool result;
+  result = myScale.reset(); //Reset all registers
+  result &= myScale.powerUp(); //Power on analog and digital sections of the scale
+
+  result &= myScale.setLDO(NAU7802_LDO_3V3); //Set LDO to 3.3V
+  result &= myScale.setGain(NAU7802_GAIN_128); //Set gain to 128
+  result &= myScale.setSampleRate(NAU7802_SPS_40); //Set samples per second to 40
+  result &= myScale.setRegister(NAU7802_ADC, 0x30); //Turn off CLK_CHP. From 9.1 power on sequencing.
+
+  result &= myScale.calibrateAFE(); //Re-cal analog front end when we change gain, sample rate, or channel
+
+  return result;
+}
+
+bool SetupScales(byte dbg_level)
+{
+  debug_level = dbg_level;
+  if (debug_level > 0) {
+    gCatena.SafePrintf("SetupScales start\n");
+  }
+  //  pinMode(interruptPin, INPUT);
+
+  if (!myScale.begin(Wire, false))
+  {
+    gCatena.SafePrintf("Scale not detected. Please check wiring. Freezing...\n");
+    return false;
+  }
+  gCatena.SafePrintf("Scale detected!\n");
+
+  bool result = InitializeScales();
+  if (debug_level > 0) {
+    gCatena.SafePrintf("SetupScales done, result: %d\n", result);
+  }
+
+  return result;
+}
+
+long ReadScale(char channel)
+{
+  long res;
+
+  if (debug_level > 0) {
+    gCatena.SafePrintf("ReadScale Start, Channel %c\n",  channel);
+  }
+
+  uint8_t channelNumber;
+  if (channel == 'B') {
+    channelNumber = NAU7802_CHANNEL_1;
+  } else {
+    channelNumber = NAU7802_CHANNEL_2;
+  }
+  unsigned long startTime = millis();
+  myScale.setChannel(channelNumber);
+  bool calibrate_success = myScale.calibrateAFE();
+  if (! calibrate_success) {
+    if (debug_level > 0) {
+      gCatena.SafePrintf("Error: Calibration not successful!\n");
+    }
+  }
+
+  if (myScale.available()) {
+    long dummy = myScale.getReading();
+  }
+  int const num_scale_readings = SAMPLES; // number of instantaneous scale readings to calculate the median
+
+  // we use the median, not the average, see https://community.particle.io/t/boron-gpio-provides-less-current-than-electrons-gpio/46647/13
+  long readings[num_scale_readings];  // create array to hold readings
+  for (int i = 0; i < num_scale_readings; i++) {
+    //while (digitalRead(interruptPin) == LOW) {
+    unsigned long mytimer = millis();
+    int timeouts = 0;
+    while (! myScale.available() && (timeouts < 3)) {
+      // we set a timeout of 10 seconds for the measurement...
+      if ((millis() - mytimer) > 10000) {
+        timeouts = timeouts + 1;
+        // Timeout reading scale...
+        Wire.endTransmission(true);
+        delay(50);
+        InitializeScales();
+        if (debug_level > 0) {
+          gCatena.SafePrintf("Timeout while reading scale...\n");
+        }
+      }
+      delay(50);
+    }
+    long reading;
+    if (myScale.available()) {
+      reading = myScale.getReading();
+      readings[i] = reading;
+    }
+    if (debug_level > 0) {
+      gCatena.SafePrintf("Reading: %d\n", reading);
+    }
+    delay(50);
+  }
+
+  unsigned long duration = millis() - startTime;
+  res = median(readings, num_scale_readings); // calculate median
+
+  if (debug_level > 0) {
+    gCatena.SafePrintf("Median of %d samples: %d\n", num_scale_readings, res);
+    float sdev;
+    sdev = stddev(readings, num_scale_readings);
+    float sdev_proc;
+    sdev_proc = 100 * (sdev / float(res));
+    gCatena.SafePrintf("Measurements: [");
+    for (int i = 0; i < num_scale_readings; i++) {
+      gCatena.SafePrintf("%d", readings[i]);
+      if (i < (SAMPLES - 1)) {
+        gCatena.SafePrintf(",");
+      }
+
+    }
+    gCatena.SafePrintf("]\n");
+
+    gCatena.SafePrintf("Standard Deviation: %d.%03d\n", (int)sdev, (int)abs(sdev * 1000) % 1000);
+    gCatena.SafePrintf("Standard Deviation / Median (Percent): %d.%03d\n", (int)sdev_proc, (int)abs(sdev_proc * 1000) % 1000);
+    gCatena.SafePrintf("Duration (ms): %d\n", duration);
+  }
+
+  if (debug_level > 0) {
+    gCatena.SafePrintf("ReadScale Done\n");
+  }
+
+  return res;
+}
+
+void PowerdownScale()
+{
+  if (debug_level > 0) {
+    gCatena.SafePrintf("PowerdownScale Start\n");
+  }
+  myScale.powerDown();
+  if (debug_level > 0) {
+    gCatena.SafePrintf("PowerdownScale Done\n");
+  }
+}
+
+void PowerupScale()
+{
+  if (debug_level > 0) {
+    gCatena.SafePrintf("PowerupScale Start\n");
+  }
+
+  InitializeScales();
+
+  if (debug_level > 0) {
+    gCatena.SafePrintf("PowerupScale Done\n");
+  }
+}