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/*
* Author: JP Meijers
* Date: 2016-09-07
*
* This example program is meant for a The Things UNO board with an
* "Adafruit Ultimate GPS+Logging Shield" on top of it. Make sure the switch on
* the GPS shield is switched to the "Soft. Serial" position.
*
* Coordinates from the GPS is packed into a LoRaWan packet using binary
* encoding, and then sent out on the air using the TTN UNO's RN2xx3 module.
* This happens as fast as possible, while still keeping to the 1% duty cycle
* rules enforced by the RN2483's built in LoRaWAN stack. Even though this is
* allowed by the radio regulations of the 868MHz band, the fair use policy of
* TTN may prohibit this.
*
* CHECK THE RULES BEFORE USING THIS PROGRAM!
*
* CHANGE ADDRESS!
* Change the device address, network (session) key, and app (session) key to
* the values that are registered via the TTN dashboard.
* The appropriate line is "myLora.initABP(XXX);" or "myLora.initOTAA(XXX);"
* When using ABP, it is advised to enable "relax frame count" on the dashboard.
*
* TO CONTRIBUTE TO TTN Mapper:
* 1. Register a new Application and/or new device on the
* TTN Dashboard (https://console.thethingsnetwork.org).
* 2. Copy the correct keys into the line "myLora.initABP(XXX);"
* or "myLora.initOTAA(XXX);" in this program.
* 3. Comment out or remove the line: "while(!Serial); //wait for Serial to
be available - remove this line after successful test run"
* 4. Make sure packets are arriving on the TTN console when your node is
* powered and in reach of a gateway.
* 5. Share your Application ID, Access Key and Device ID with
* contribute@ttnmapper.org so that your measurements can be automatically
* imported into TTN Mapper.
*
*
* To decode the binary payload, you can use the following
* javascript decoder function. It should work with the TTN console.
*
function Decoder(bytes, port) {
// Decode an uplink message from a buffer
// (array) of bytes to an object of fields.
var decoded = {};
// if (port === 1) decoded.led = bytes[0];
decoded.lat = ((bytes[0]<<16)>>>0) + ((bytes[1]<<8)>>>0) + bytes[2];
decoded.lat = (decoded.lat / 16777215.0 * 180) - 90;
decoded.lon = ((bytes[3]<<16)>>>0) + ((bytes[4]<<8)>>>0) + bytes[5];
decoded.lon = (decoded.lon / 16777215.0 * 360) - 180;
var altValue = ((bytes[6]<<8)>>>0) + bytes[7];
var sign = bytes[6] & (1 << 7);
if(sign)
{
decoded.alt = 0xFFFF0000 | altValue;
}
else
{
decoded.alt = altValue;
}
decoded.hdop = bytes[8] / 10.0;
return decoded;
}
*
*/
#include "TinyGPS++.h"
#include <SoftwareSerial.h>
#include <rn2xx3.h>
SoftwareSerial gpsSerial(8, 9); // RX, TX
TinyGPSPlus gps;
rn2xx3 myLora(Serial1);
unsigned long last_update = 0;
String toLog;
uint8_t txBuffer[9];
uint32_t LatitudeBinary, LongitudeBinary;
uint16_t altitudeGps;
uint8_t hdopGps;
#define PMTK_SET_NMEA_UPDATE_05HZ "$PMTK220,2000*1C"
#define PMTK_SET_NMEA_UPDATE_1HZ "$PMTK220,1000*1F"
#define PMTK_SET_NMEA_OUTPUT_RMCGGA "$PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28"
void setup() {
//output LED pin
pinMode(13, OUTPUT);
led_on();
Serial.begin(57600); //serial to computer
gpsSerial.begin(9600); //serial to gps
Serial1.begin(57600); //serial to RN2xx3
// make sure usb serial connection is available,
// or after 10s go on anyway for 'headless' use of the
// node.
while ((!Serial) && (millis() < 10000));
Serial.println("TTN UNO + GPS shield startup");
//set up RN2xx3
initialize_radio();
//transmit a startup message
myLora.tx("TTN Mapper on TTN Uno with GPS");
gpsSerial.println(F(PMTK_SET_NMEA_OUTPUT_RMCGGA));
gpsSerial.println(F(PMTK_SET_NMEA_UPDATE_1HZ)); // 1 Hz update rate
led_off();
delay(1000);
}
void initialize_radio()
{
delay(100); //wait for the RN2xx3's startup message
Serial1.flush();
//print out the HWEUI so that we can register it via ttnctl
String hweui = myLora.hweui();
while(hweui.length() != 16)
{
Serial.println("Communication with RN2xx3 unsuccessful. Power cycle the TTN UNO board.");
delay(10000);
hweui = myLora.hweui();
}
Serial.println("When using OTAA, register this DevEUI: ");
Serial.println(hweui);
Serial.println("RN2xx3 firmware version:");
Serial.println(myLora.sysver());
//configure your keys and join the network
Serial.println("Trying to join TTN");
bool join_result = false;
//ABP: initABP(String addr, String AppSKey, String NwkSKey);
join_result = myLora.initABP("02017201", "8D7FFEF938589D95AAD928C2E2E7E48F", "AE17E567AECC8787F749A62F5541D522");
//OTAA: initOTAA(String AppEUI, String AppKey);
//join_result = myLora.initOTAA("70B3D57ED00001A6", "A23C96EE13804963F8C2BD6285448198");
while(!join_result)
{
Serial.println("Unable to join. Are your keys correct, and do you have TTN coverage?");
delay(60000); //delay a minute before retry
join_result = myLora.init();
}
Serial.println("Successfully joined TTN");
}
void loop() {
while (gpsSerial.available()){
gps.encode(gpsSerial.read());
}
if (gps.location.age() < 1000 && (millis() - last_update) >= 1000) {
led_on();
Serial.print("Interval: ");
Serial.println(millis()-last_update);
build_packet();
Serial.println(toLog);
myLora.txBytes(txBuffer, sizeof(txBuffer));
Serial.println("TX done");
led_off();
last_update = millis();
}
}
void build_packet()
{
LatitudeBinary = ((gps.location.lat() + 90) / 180.0) * 16777215;
LongitudeBinary = ((gps.location.lng() + 180) / 360.0) * 16777215;
txBuffer[0] = ( LatitudeBinary >> 16 ) & 0xFF;
txBuffer[1] = ( LatitudeBinary >> 8 ) & 0xFF;
txBuffer[2] = LatitudeBinary & 0xFF;
txBuffer[3] = ( LongitudeBinary >> 16 ) & 0xFF;
txBuffer[4] = ( LongitudeBinary >> 8 ) & 0xFF;
txBuffer[5] = LongitudeBinary & 0xFF;
altitudeGps = gps.altitude.meters();
txBuffer[6] = ( altitudeGps >> 8 ) & 0xFF;
txBuffer[7] = altitudeGps & 0xFF;
hdopGps = gps.hdop.value()/10;
txBuffer[8] = hdopGps & 0xFF;
toLog = "";
for(size_t i = 0; i<sizeof(txBuffer); i++)
{
char buffer[3];
sprintf(buffer, "%02x", txBuffer[i]);
toLog = toLog + String(buffer);
}
}
void led_on(){
digitalWrite(13, 1);
}
void led_off(){
digitalWrite(13, 0);
}
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