How to read RSSI & SNR with Heltec's LoraWAN library

#1

LoraWAN libraries usually have the following;

LoRa.rssi() to read the current RSSI of the rario, LoRa.packetRssi() to read the RSSI of the averaged RSSI of the last received packet & LoRa.packetSnr() to read the estimated SNR of the received packet.

What are the equivalent of these in Heltec’s LoraWAN library?

My Best,
Ben

WiFi LoRa 32 V3 Documentation repository
#2

hi,

please refer the picture:

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#3

Hi Jason, Yes I am aware of getting RSSI and SNR during a downlink. How do I read at other times. For instance, how do I know the RSSI and SNR for a device which never receives a downlink message?

#4

you can Define a global variable. When you receive the downlink, pass the value to the global variable you defined.

#5

Jason, In reality we have devices which will have no downlink at all. Thats the problem. Please take a look at the attached image.

rssi-uplink
rssi-uplink.png1686×778 139 KB

After an uplink is complete, heltec library also is showing the RSSI. I would like to capture it, not form the downlink.

#6

hi,

Still the same result. confirm mode have a ACK. You can still do as I just said to get the RSSI…

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just do it.

#7

hi i m trying to extract the downlink RX sended to my device, can u paste your arduino code plz, it will help!

#8

here you are, add this to your arduino code:

void downLinkAckHandle(McpsIndication_t *mcpsIndication)
{
  printf("\n\tdownLinkAckHandle: ACK received\n");
  printf("\n\t+REV DATA:%s,\n\tRXSIZE %d,\n\tPORT %d, RSSI: %d,\n\t SNR: %d,\n\t DATA_RATE:%d,\r\n",
            mcpsIndication->RxSlot ? "RXWIN2" : "RXWIN1", mcpsIndication->BufferSize, mcpsIndication->Port,
            mcpsIndication->Rssi, (int)mcpsIndication->Snr, (int)mcpsIndication->RxDoneDatarate);
}

cheers,
Jay

#9

do i need to call this function in the void loop() ??

#10

nope just add it to your code and it will be called automatically when a down link ACK is received.
watch your serial.