I’m trying to modify the example named “LoRaWan_downlinkdatahandle” to send sensor date using the Cayenne LPP library.
I modified the prepareTxFrame function :
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 = 4;
appData[0] = 0x00;
appData[1] = 0x01;
appData[2] = 0x02;
appData[3] = 0x03;/
lpp.reset();
lpp.addTemperature(4, bmp.readTemperature());
lpp.addBarometricPressure(7,(bmp.readPressure()/100.0));
appDataSize = lpp.getSize();
appData=lpp.getBuffer();
}
And i obtain an error :
Arduino : 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Carte : “WiFi LoRa 32(V3) / Wireless shell(V3) / Wireless stick lite (V3), Core 1, Core 1, 240MHz (WiFi), 115200, None, REGION_EU868, None, CUSTOM, 8(default)”
C:\Users\tanguy-e\Documents\Arduino\LoRa\LoRaWan_downlinkdatahandle\LoRaWan_downlinkdatahandle.ino: In function ‘void prepareTxFrame(uint8_t)’:
LoRaWan_downlinkdatahandle:83:27: error: incompatible types in assignment of ‘uint8_t*’ {aka ‘unsigned char*’} to ‘uint8_t [255]’ {aka ‘unsigned char [255]’}
appData=lpp.getBuffer();
^
exit status 1
incompatible types in assignment of ‘uint8_t*’ {aka ‘unsigned char*’} to ‘uint8_t [255]’ {aka ‘unsigned char [255]’}
I’m quite a newbie and i can’t understand this type mismatch and how to solve it.
Thanks
Eric
#include “LoRaWan_APP.h”
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_BMP280.h>
#include <CayenneLPP.h>
CayenneLPP lpp(51);
/* OTAA para*/
uint8_t devEui[] = { 0x70, 0xb3, 0xd5, 0x7e, 0xd0, 0x05, 0xe8, 0xee }; /* Pas utile si Generate by ChipID is selected */
uint8_t appEui[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
uint8_t appKey[] = { 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88 };
/* ABP para*/
uint8_t nwkSKey[] = { 0xfa, 0x4e, 0x25, 0x1e, 0x89, 0x48, 0x3a, 0x53, 0x63, 0x8c, 0xcb, 0x6e, 0xbf, 0xdf, 0x25,0x1b };
uint8_t appSKey[] = { 0x13, 0x5c, 0xe2, 0x94, 0xea, 0x55, 0x63, 0xa1, 0xb4, 0x12, 0xe2, 0x8a, 0x97, 0x48, 0xb5,0x93 };
uint32_t devAddr = ( uint32_t )0x260b1d21;
/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;
Adafruit_BMP280 bmp;
/* 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 = 4;
appData[0] = 0x00;
appData[1] = 0x01;
appData[2] = 0x02;
appData[3] = 0x03;/
lpp.reset();
lpp.addTemperature(4, bmp.readTemperature());
lpp.addBarometricPressure(7,(bmp.readPressure()/100.0));
appDataSize = lpp.getSize();
appData=lpp.getBuffer();
}
//downlink data handle function example
void downLinkDataHandle(McpsIndication_t *mcpsIndication)
{
Serial.printf("+REV DATA:%s,RXSIZE %d,PORT %d\r\n",mcpsIndication->RxSlot?“RXWIN2”:“RXWIN1”,mcpsIndication->BufferSize,mcpsIndication->Port);
Serial.printf(“Données reçues : \n”);
Serial.print("+REV DATA:");
for(uint8_t i=0;iBufferSize;i++)
{
Serial.printf("%02X",mcpsIndication->Buffer[i]);
}
Serial.println();
uint32_t color=mcpsIndication->Buffer[0]<<16|mcpsIndication->Buffer[1]<<8|mcpsIndication->Buffer[2];
#if(LoraWan_RGB==1)
turnOnRGB(color,5000);
turnOffRGB();
#endif
}
void setup() {
Serial.begin(115200);
unsigned status;
status = bmp.begin(BMP280_ADDRESS_ALT, BMP280_CHIPID);
if (!status) {
Serial.println(F("Could not find a valid BMP280 sensor, check wiring or "
“try a different address!”));
}
bmp.setSampling(Adafruit_BMP280::MODE_NORMAL, /* Operating Mode. /
Adafruit_BMP280::SAMPLING_X2, / Temp. oversampling /
Adafruit_BMP280::SAMPLING_X16, / Pressure oversampling /
Adafruit_BMP280::FILTER_X16, / Filtering. /
Adafruit_BMP280::STANDBY_MS_500); / Standby time. */
Mcu.begin();
deviceState = DEVICE_STATE_INIT;
}
void loop()
{
switch( deviceState )
{
case DEVICE_STATE_INIT:
{
#if(LORAWAN_DEVEUI_AUTO)
LoRaWAN.generateDeveuiByChipID();
#endif
LoRaWAN.init(loraWanClass,loraWanRegion);
break;
}
case DEVICE_STATE_JOIN:
{
LoRaWAN.join();
break;
}
case DEVICE_STATE_SEND:
{
prepareTxFrame( appPort );
LoRaWAN.send();
deviceState = DEVICE_STATE_CYCLE;
break;
}
case DEVICE_STATE_CYCLE:
{
// 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;
}
}
}