ESP32_LoRaWAN Downlink message save

#1

Hello all. I have a Heltec LoRa32 V2 that I am using as a node to connect to my TTN gateway. I am using the ESP32_LoRaWAN library. In the past I have used these micro controllers to test node to node communication using the heltec.h library. In this library I was able to save input to global variables using LoRa.read. Now I am trying to do same with this library but can’t seem to find a way to accomplish that. I have seen downlink capabilities in the OTAA_LED sketch as shown below.

void  downLinkDataHandle(McpsIndication_t *mcpsIndication)

{
lora_printf("+REV DATA:%s,RXSIZE %d,PORT %d\r\n",mcpsIndication->RxSlot?“RXWIN2”:“RXWIN1”,mcpsIndication->BufferSize,mcpsIndication->Port);
lora_printf("+REV DATA:");
app(mcpsIndication->Buffer[0]);

for(uint8_t i=0;iBufferSize;i++)
{
lora_printf("%02X",mcpsIndication->Buffer[i]);
}
lora_printf("\r\n");
}

I noticed that in this sketch there is a case-based system for changing the LED state but not to save that downlink message into a global variable. (as shown below)

#define LEDPin 25  //LED light

void app(uint8_t data)
{
// lora_printf(“data:%d\r\n”,data);
switch(data)
{
case 49:
{
pinMode(LEDPin,OUTPUT);
digitalWrite(LEDPin, HIGH);
break;
}
case 50:
{
pinMode(LEDPin,OUTPUT);
digitalWrite(LEDPin, LOW);
break;
}
case 51:
{
break;
}
default:
{
break;
}
}
}

I was wondering if there is a way to do this?

#2

I’ve not used lorar wan but I did a search on the mcpsindication and found an implementation that seems to be reading the data.

Have a look at the routine at line 150 of this library.

It looks like this structure contains an indication whether data has been received, a pointer to the buffer and buffer length. So you may just be able to malloc a global buffer and use memcpy from this.

It may not be that straightforward but hopefully will be of some use.

#3

unfortunately, it didnt work.

#4

You can refer to this example for rewriting.