LoRaWAN-Modbus-Gateway/sketch/sketch.ino

#include "LoRaWan_APP.h"
// #include <ArduinoRS485.h>
#include <ArduinoModbus.h>


#define RX_PIN 7
#define TX_PIN 6
#define RE_PIN 5
#define DE_PIN 4
#define LED_RED 3
#define LED_GREEN 2
#define LED_BLUE 45



/* OTAA para*/
uint8_t devEui[] = { 0x22, 0x32, 0x33, 0x00, 0x00, 0x88, 0x88, 0x02 };
uint8_t appEui[] = { 0xa0, 0x57, 0x81, 0x00, 0x01, 0x12, 0xaa, 0xf3 };
uint8_t appKey[] = { 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88 };


/* ABP para*/
uint8_t nwkSKey[] = { 0x15, 0xb1, 0xd0, 0xef, 0xa4, 0x63, 0xdf, 0xbe, 0x3d, 0x11, 0x18, 0x1e, 0x1e, 0xc7, 0xda,0x85 };
uint8_t appSKey[] = { 0xd7, 0x2c, 0x78, 0x75, 0x8c, 0xdc, 0xca, 0xbf, 0x55, 0xee, 0x4a, 0x77, 0x8d, 0x16, 0xef,0x67 };
uint32_t devAddr =  ( uint32_t )0x007e6ae1;

/*LoraWan channelsmask, default channels 0-7*/ 
uint16_t userChannelsMask[6]={ 0x00FF,0x0000,0x0000,0x0000,0x0000,0x0000 };

/*LoraWan region, select in arduino IDE tools*/
LoRaMacRegion_t loraWanRegion = ACTIVE_REGION;

/*LoraWan Class, Class A and Class C are supported*/
DeviceClass_t  loraWanClass = CLASS_A;

/*the application data transmission duty cycle.  value in [ms].*/
uint32_t appTxDutyCycle = 15000;

/*OTAA or ABP*/
bool overTheAirActivation = true;

/*ADR enable*/
bool loraWanAdr = true;

/* Indicates if the node is sending confirmed or unconfirmed messages */
bool isTxConfirmed = true;

/* Application port */
uint8_t appPort = 2;
/*!
* Number of trials to transmit the frame, if the LoRaMAC layer did not
* receive an acknowledgment. The MAC performs a datarate adaptation,
* according to the LoRaWAN Specification V1.0.2, chapter 18.4, according
* to the following table:
*
* Transmission nb | Data Rate
* ----------------|-----------
* 1 (first)       | DR
* 2               | DR
* 3               | max(DR-1,0)
* 4               | max(DR-1,0)
* 5               | max(DR-2,0)
* 6               | max(DR-2,0)
* 7               | max(DR-3,0)
* 8               | max(DR-3,0)
*
* Note, that if NbTrials is set to 1 or 2, the MAC will not decrease
* the datarate, in case the LoRaMAC layer did not receive an acknowledgment
*/
uint8_t confirmedNbTrials = 4;

RS485Class* pRS485_1; 
ModbusRTUClientClass* pModbusClient;

/* Prepares the payload of the frame */
static void prepareTxFrame( uint8_t port )
{
  /*appData size is LORAWAN_APP_DATA_MAX_SIZE which is defined in "commissioning.h".
  *appDataSize max value is LORAWAN_APP_DATA_MAX_SIZE.
  *if enabled AT, don't modify LORAWAN_APP_DATA_MAX_SIZE, it may cause system hanging or failure.
  *if disabled AT, LORAWAN_APP_DATA_MAX_SIZE can be modified, the max value is reference to lorawan region and SF.
  *for example, if use REGION_CN470, 
  *the max value for different DR can be found in MaxPayloadOfDatarateCN470 refer to DataratesCN470 and BandwidthsCN470 in "RegionCN470.h".
  */
    appDataSize = 8;

    Serial.println("modbus operation");

    long v1 = pModbusClient->inputRegisterRead(7, 0x01);
    Serial.print("v1: ");
    Serial.println(v1);
    memcpy(appData, &v1, 4);

    long v2 = pModbusClient->inputRegisterRead(7, 0x02);
    Serial.print("v2: ");
    Serial.println(v2);
    memcpy(appData+4, &v2, 4);
    
    //appData[0] = 0x10;
    //appData[1] = 0x21;
    //appData[2] = 0x32;
    //appData[3] = 0x43;
}

//if true, next uplink will add MOTE_MAC_DEVICE_TIME_REQ 


void setup() {
  Serial.begin(115200);
  Serial1.begin(9600, SERIAL_8N1, RX_PIN, TX_PIN);
  pRS485_1 = new RS485Class(Serial1, TX_PIN, RE_PIN, DE_PIN);
  pModbusClient = new ModbusRTUClientClass(*pRS485_1);
  pModbusClient->begin(9600, SERIAL_8N1);
  
  pinMode(LED_BLUE, OUTPUT);
  digitalWrite(LED_BLUE, LOW);
  pinMode(LED_RED, OUTPUT);
  digitalWrite(LED_RED, LOW);
  pinMode(LED_GREEN, OUTPUT);
  digitalWrite(LED_GREEN, LOW);

  Mcu.begin();
  deviceState = DEVICE_STATE_INIT;
}

void loop()
{
#if 1
  
  digitalWrite(LED_GREEN, HIGH);

  switch( deviceState )
  {
    case DEVICE_STATE_INIT:
    digitalWrite(LED_GREEN, LOW);
    {
#if(LORAWAN_DEVEUI_AUTO)
      LoRaWAN.generateDeveuiByChipID();
#endif
      LoRaWAN.init(loraWanClass,loraWanRegion);
      break;
    }
    case DEVICE_STATE_JOIN:
    {
      LoRaWAN.join();
      break;
    }
    case DEVICE_STATE_SEND:
    digitalWrite(LED_BLUE, HIGH);
    {
      Serial.println("sending");
      prepareTxFrame( appPort );
      LoRaWAN.send();
      deviceState = DEVICE_STATE_CYCLE;
      break;
    }
    case DEVICE_STATE_CYCLE:
    digitalWrite(LED_BLUE, LOW);
    {
      // Schedule next packet transmission
      txDutyCycleTime = appTxDutyCycle + randr( -APP_TX_DUTYCYCLE_RND, APP_TX_DUTYCYCLE_RND );
      LoRaWAN.cycle(txDutyCycleTime);
      deviceState = DEVICE_STATE_SLEEP;
      break;
    }
    case DEVICE_STATE_SLEEP:
    {
      LoRaWAN.sleep(loraWanClass);
      break;
    }
    default:
    {
      deviceState = DEVICE_STATE_INIT;
      break;
    }
  }
#endif

#if 0
  // for (slave) id 1: write the value of 0x01, to the coil at address 0x00 
  if (!ModbusRTUClient.coilWrite(1, 0x00, 0x01)) {
    Serial.print("Failed to write coil! ");
    Serial.println(ModbusRTUClient.lastError());
  }

  // wait for 1 second
  delay(1000);

  // for (slave) id 1: write the value of 0x00, to the coil at address 0x00 
  if (!ModbusRTUClient.coilWrite(1, 0x00, 0x00)) {
    Serial.print("Failed to write coil! ");
    Serial.println(ModbusRTUClient.lastError());
  }

  // wait for 1 second
  delay(1000);
#endif
}