new payload converter TTNpacked

README.md

@@ -20,23 +20,25 @@ This can all be done with a single small and cheap ESP32 board for less than $20
 # Hardware
 
 Supported ESP32 based LoRa IoT boards:
-- **Heltec LoRa-32**  a)
-- **TTGOv1**  a)
-- **TTGOv2**  a,d)
-- **TTGOv2.1**  a),e)
-- **TTGO T-Beam**  d),e),f)
-- **Pycom LoPy**  b),f)*
-- **Pycom LoPy4**  b),f)*
-- **Pycom FiPy**  b),f)*
-- **LoLin32** with [LoraNode32 shield](https://github.com/hallard/LoLin32-Lora)  b),c)
-- **LoLin32 Lite** with [LoraNode32-Lite shield](https://github.com/hallard/LoLin32-Lite-Lora)  b),c)
+- **Heltec LoRa-32**
+- **TTGOv1** 
+- **TTGOv2** 
+- **TTGOv2.1**
+- **TTGO T-Beam**
+- **Pycom LoPy**
+- **Pycom LoPy4**
+- **Pycom FiPy**
+- **LoLin32** + [LoraNode32 shield](https://github.com/hallard/LoLin32-Lora)
+- **LoLin32 Lite** + [LoraNode32-Lite shield](https://github.com/hallard/LoLin32-Lite-Lora)
 
-a) on board OLED Display supported;
-b) on board RGB LED supported;
-c) on board Hardware unique DEVEUI supported;
-d) external wiring needed, see instructions in file /hal/<board>.h;
-e) battery voltage monitoring supported;
-f) on board GPS supported, *for Pycom devices with additional PyTrack board
+Depending on board hardware following features are supported:
+- LED
+- OLED Display
+- RGB LED
+- button
+- silicon unique ID
+- battery voltage monitoring
+- GPS
 
 Target platform must be selected in [platformio.ini](https://github.com/cyberman54/ESP32-Paxcounter/blob/master/platformio.ini).<br>
 Hardware dependent settings (pinout etc.) are stored in board files in /hal directory.<br>
@@ -106,7 +108,13 @@ Legend for RGB LED (LoPy/LoPy4/FiPy/Lolin32 only):
 
 # Payload
 
-All data is represented in big-endian-format, as long not otherwise stated.
+You can select between different payload formats in [paxcounter.conf](src/paxounter.conf#L40):
+
+*Plain* generates human readable json fields, e.g. useful for TTN console
+*Packed* generates packed json fiels, e.g. useful for own backends
+*[CayenneLPP]*(https://mydevices.com/cayenne/docs/lora/#lora-cayenne-low-power-payload-reference-implementation)
+
+Hereafter described is the *Plain* format. All data is represented in big-endian-format.
 
 **LoRaWAN Port #1:**
 

platformio.ini

@@ -11,11 +11,11 @@
 
 ; ---> SELECT TARGET PLATFORM HERE! <---
 [platformio]
-env_default = heltec
+;env_default = heltec
 ;env_default = ttgov1
 ;env_default = ttgov2
 ;env_default = ttgov21
-;env_default = ttgobeam
+env_default = ttgobeam
 ;env_default = lopy
 ;env_default = lopy4
 ;env_default = fipy
@@ -27,8 +27,7 @@ description = Paxcounter is a proof-of-concept ESP32 device for metering passeng
 [common_env_data]
 platform_espressif32 = espressif32@>=1.0.2
 board_build.partitions = no_ota.csv
-lib_deps_all =
-    LoRa Serialization@>=3.0.0
+;lib_deps_all =
 lib_deps_display =
     U8g2@>=2.22.14
 lib_deps_rgbled =

src/TTN/packed_converter.js

@@ -1,4 +1,4 @@
-// Converter for device payload encoder "SERIALIZED"
+// Converter for device payload encoder "PACKED"
 // copy&paste to TTN Console -> Applications -> PayloadFormat -> Converter
 
 function Converter(decoded, port) {

src/TTN/packed_decoder.js

@@ -1,4 +1,4 @@
-// Decoder for device payload encoder "SERIALIZED"
+// Decoder for device payload encoder "PACKED"
 // copy&paste to TTN Console -> Applications -> PayloadFormat -> Decoder
 
 function Decoder(bytes, port) {

src/globals.h

@@ -49,7 +49,7 @@ extern TinyGPSPlus gps;        // Make TinyGPS++ instance globally availabe
 #if PAYLOAD_ENCODER == 1
 extern TTNplain payload;
 #elif PAYLOAD_ENCODER == 2
-extern TTNserialized payload;
+extern TTNpacked payload;
 #elif PAYLOAD_ENCODER == 3
 extern CayenneLPP payload;
 #else

src/main.cpp

@@ -74,7 +74,7 @@ std::set<uint16_t> macs; // associative container holds total of unique MAC
 #if PAYLOAD_ENCODER == 1
 TTNplain payload(PAYLOAD_BUFFER_SIZE);
 #elif PAYLOAD_ENCODER == 2
-TTNserialized payload(PAYLOAD_BUFFER_SIZE);
+TTNpacked payload(PAYLOAD_BUFFER_SIZE);
 #elif PAYLOAD_ENCODER == 3
 CayenneLPP payload(PAYLOAD_BUFFER_SIZE);
 #else
@@ -594,7 +594,7 @@ void setup() {
 #if PAYLOAD_ENCODER == 1
   strcat_P(features, " PAYLOAD_PLAIN");
 #elif PAYLOAD_ENCODER == 2
-  strcat_P(features, " PAYLOAD_SERIALIZED");
+  strcat_P(features, " PAYLOAD_PACKED");
 #elif PAYLOAD_ENCODER == 3
   strcat_P(features, " PAYLOAD_CAYENNE");
 #endif

src/paxcounter.conf

@@ -36,12 +36,12 @@
 #define WIFI_MY_COUNTRY                 "EU"    // select locale for Wifi RF settings
 #define	WIFI_CHANNEL_SWITCH_INTERVAL    50      // [seconds/100] -> 0,5 sec.
 
-// LoRa payload send cycle --> take care of duty cycle of LoRaWAN network! <--
-#define SEND_SECS                       120     // [seconds/2] -> 240 sec.
-//#define SEND_SECS                       30     // [seconds/2] -> 60 sec.
+// LoRa payload parameters
+#define PAYLOAD_ENCODER                 2       // select payload encoder: 1=Plain [default], 2=Packed, 3=CayenneLPP
+//#define SEND_SECS                       120     // payload send cycle [seconds/2] -> 240 sec.
+#define SEND_SECS                       30     // payload send cycle [seconds/2] -> 60 sec.
 #define MEM_LOW                         2048    // [Bytes] low memory threshold triggering a send cycle
 #define RETRANSMIT_RCMD                 5       // [seconds] wait time before retransmitting rcommand results
-#define PAYLOAD_ENCODER                 1       // select payload encoder: 1 = Plain [default], 2 = Lora-serialized, 3 = CayenneLPP
 #define PAYLOAD_BUFFER_SIZE             51      // maximum size of payload block per transmit
 
 // Default LoRa Spreadfactor

src/payload.cpp

@@ -80,58 +80,116 @@ void TTNplain::addStatus(uint16_t voltage, uint64_t uptime, float cputemp) {
 }
 
 /* ---------------- packed format with LoRa serialization Encoder ---------- */
+// derived from
+// https://github.com/thesolarnomad/lora-serialization/blob/master/src/LoraEncoder.cpp
 
-TTNserialized::TTNserialized(uint8_t size) {
-  buffer = (uint8_t *)malloc(size);
-  //LoraEncoder message(buffer);
-}
+TTNpacked::TTNpacked(uint8_t size) { buffer = (uint8_t *)malloc(size); }
 
-TTNserialized::~TTNserialized(void) { free(buffer); }
+TTNpacked::~TTNpacked(void) { free(buffer); }
 
-void TTNserialized::reset(void) {
-} // buggy! to be done, we need to clear the buffer here, but how?
+void TTNpacked::reset(void) { buffer = 0; }
 
-uint8_t TTNserialized::getSize(void) { return sizeof(buffer); }
+uint8_t TTNpacked::getSize(void) { return sizeof(buffer); }
 
-uint8_t *TTNserialized::getBuffer(void) { return buffer; }
+uint8_t *TTNpacked::getBuffer(void) { return buffer; }
 
-void TTNserialized::addCount(uint16_t value1, uint16_t value2) {
-  LoraEncoder message(buffer);
-  message.writeUint16(value1);
-  message.writeUint16(value2);
+void TTNpacked::addCount(uint16_t value1, uint16_t value2) {
+  writeUint16(value1);
+  writeUint16(value2);
 }
 
 #ifdef HAS_GPS
-void TTNserialized::addGPS(gpsStatus_t value) {
-  LoraEncoder message(buffer);
-  message.writeLatLng(value.latitude, value.longitude);
-  message.writeUint8(value.satellites);
-  message.writeUint16(value.hdop);
-  message.writeUint16(value.altitude);
+void TTNpacked::addGPS(gpsStatus_t value) {
+  writeLatLng(value.latitude, value.longitude);
+  writeUint8(value.satellites);
+  writeUint16(value.hdop);
+  writeUint16(value.altitude);
 }
 #endif
 
-void TTNserialized::addConfig(configData_t value) {
-  LoraEncoder message(buffer);
-  message.writeUint8(value.lorasf);
-  message.writeUint16(value.rssilimit);
-  message.writeUint8(value.sendcycle);
-  message.writeUint8(value.wifichancycle);
-  message.writeUint8(value.blescantime);
-  message.writeUint8(value.rgblum);
-  message.writeBitmap(
-      value.adrmode ? true : false, value.screensaver ? true : false,
-      value.screenon ? true : false, value.countermode ? true : false,
-      value.blescan ? true : false, value.wifiant ? true : false,
-      value.vendorfilter ? true : false, value.gpsmode ? true : false);
+void TTNpacked::addConfig(configData_t value) {
+  writeUint8(value.lorasf);
+  writeUint16(value.rssilimit);
+  writeUint8(value.sendcycle);
+  writeUint8(value.wifichancycle);
+  writeUint8(value.blescantime);
+  writeUint8(value.rgblum);
+  writeBitmap(value.adrmode ? true : false, value.screensaver ? true : false,
+              value.screenon ? true : false, value.countermode ? true : false,
+              value.blescan ? true : false, value.wifiant ? true : false,
+              value.vendorfilter ? true : false, value.gpsmode ? true : false);
 }
 
-void TTNserialized::addStatus(uint16_t voltage, uint64_t uptime,
-                              float cputemp) {
-  LoraEncoder message(buffer);
-  message.writeUint16(voltage);
-  message.writeUnixtime(uptime);
-  message.writeTemperature(cputemp);
+void TTNpacked::addStatus(uint16_t voltage, uint64_t uptime, float cputemp) {
+  writeUint16(voltage);
+  writeUnixtime(uptime);
+  writeTemperature(cputemp);
+}
+
+void TTNpacked::_intToBytes(byte *buf, int32_t i, uint8_t byteSize) {
+  for (uint8_t x = 0; x < byteSize; x++) {
+    buf[x] = (byte)(i >> (x * 8));
+  }
+}
+
+void TTNpacked::writeUnixtime(uint32_t unixtime) {
+  _intToBytes(buffer, unixtime, 4);
+  buffer += 4;
+}
+
+void TTNpacked::writeLatLng(double latitude, double longitude) {
+  int32_t lat = latitude * 1e6;
+  int32_t lng = longitude * 1e6;
+
+  _intToBytes(buffer, lat, 4);
+  _intToBytes(buffer + 4, lng, 4);
+  buffer += 8;
+}
+
+void TTNpacked::writeUint16(uint16_t i) {
+  _intToBytes(buffer, i, 2);
+  buffer += 2;
+}
+
+void TTNpacked::writeUint8(uint8_t i) {
+  _intToBytes(buffer, i, 1);
+  buffer += 1;
+}
+
+void TTNpacked::writeHumidity(float humidity) {
+  int16_t h = (int16_t)(humidity * 100);
+  _intToBytes(buffer, h, 2);
+  buffer += 2;
+}
+
+/**
+ * Uses a 16bit two's complement with two decimals, so the range is
+ * -327.68 to +327.67 degrees
+ */
+void TTNpacked::writeTemperature(float temperature) {
+  int16_t t = (int16_t)(temperature * 100);
+  if (temperature < 0) {
+    t = ~-t;
+    t = t + 1;
+  }
+  buffer[0] = (byte)((t >> 8) & 0xFF);
+  buffer[1] = (byte)t & 0xFF;
+  buffer += 2;
+}
+
+void TTNpacked::writeBitmap(bool a, bool b, bool c, bool d, bool e, bool f,
+                            bool g, bool h) {
+  uint8_t bitmap = 0;
+  // LSB first
+  bitmap |= (a & 1) << 7;
+  bitmap |= (b & 1) << 6;
+  bitmap |= (c & 1) << 5;
+  bitmap |= (d & 1) << 4;
+  bitmap |= (e & 1) << 3;
+  bitmap |= (f & 1) << 2;
+  bitmap |= (g & 1) << 1;
+  bitmap |= (h & 1) << 0;
+  writeUint8(bitmap);
 }
 
 /* ---------------- Cayenne LPP format ---------- */

src/payload.h

@@ -3,7 +3,6 @@
 #define _PAYLOAD_H_
 
 #include <Arduino.h>
-#include "LoraEncoder.h"
 
 // MyDevices CayenneLPP channels
 #define LPP_GPS_CHANNEL 20
@@ -42,10 +41,10 @@ private:
   uint8_t cursor;
 };
 
-class TTNserialized {
+class TTNpacked {
 public:
-  TTNserialized(uint8_t size);
-  ~TTNserialized();
+  TTNpacked(uint8_t size);
+  ~TTNpacked();
 
   void reset(void);
   uint8_t getSize(void);
@@ -60,7 +59,15 @@ public:
 
 private:
   uint8_t *buffer;
-  LoraEncoder message(byte *buffer);
+  void _intToBytes(byte *buf, int32_t i, uint8_t byteSize);
+  void writeUnixtime(uint32_t unixtime);
+  void writeLatLng(double latitude, double longitude);
+  void writeUint16(uint16_t i);
+  void writeUint8(uint8_t i);
+  void writeHumidity(float humidity);
+  void writeTemperature(float temperature);
+  void writeBitmap(bool a, bool b, bool c, bool d, bool e, bool f, bool g,
+                   bool h);
 };
 
 class CayenneLPP {