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[LoRaWAN] Single channel gateway issue #26

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battosai30 opened this issue Jul 24, 2018 · 8 comments
Closed

[LoRaWAN] Single channel gateway issue #26

battosai30 opened this issue Jul 24, 2018 · 8 comments

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@battosai30
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Hi,

I tried two single channel gateway and having troubles with both, but no problem on a "real" gateway (Rpi+ic-880).

I tried OTAA and ABP.

OTAA : the node doesn't not seems to receive the JOIN_ACCEPT message. I tried a lot of config, the join resquest is well received (I have to fix DR to 5) the gateway seems to send well the join accept but the node seems to receive nothing.

ABP : it works but only ~1msg/5 succesfully arrived on server :s

As the issue appears on two different gateways (one is esp32 + sx1276 board, the other is a Dragino LG01) I think it's not coming from the gateway firmwares or it's a protocol issue I missed something configuring node and/or gateway.

So if you have any suggestion :)
@battosai30
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Ok I think I defeated the beast xD

So I used my mDot-868 to check if the problem comes from the gateway or the node. So, I decided to work on ABP mode first to eliminate downlink as a potential error source.

So first I observed the same troubles. But quickly I noticed something as mDot output more debug information, and espacially frequency used : frequencies are rolling. I don't know in details LoRaWAN protocol so I think its normal to reduce dutycycle. But with a mono-canal gateway it becomes a problem ... So I configured my mdot to only use 868.1 MHz and bingo, I received almost all packet (sometimes one is lost but I think it's the gateway that is used by another node). So on my Murata ABZ board I used this code :

#include "LoRaWAN.h"

const char *devAddr = "******";
const char *nwkSKey = "******";
const char *appSKey = "******";

void setup( void )
{

  Serial.begin(9600);
  while(!Serial);
  
    LoRaWAN.begin(EU868);
    LoRaWAN.disableChannel(0);
    LoRaWAN.disableChannel(1);
    LoRaWAN.disableChannel(2);
    LoRaWAN.disableChannel(3);
    LoRaWAN.addChannel(0, 868100000, 0, 7);
    LoRaWAN.enableChannel(0);

    LoRaWAN.setAntennaGain(2.0);
    LoRaWAN.setDataRate(5);
    LoRaWAN.setTxPower(14);
    LoRaWAN.joinABP(devAddr, nwkSKey, appSKey);

    Serial.println("JOIN( )");
}

void loop( void )
{
    if (LoRaWAN.joined() && !LoRaWAN.busy())
    {
        Serial.print("TRANSMIT( ");
        Serial.print("TimeOnAir: ");
        Serial.print(LoRaWAN.getTimeOnAir());
        Serial.print(", NextTxTime: ");
        Serial.print(LoRaWAN.getNextTxTime());
        Serial.print(", MaxPayloadSize: ");
        Serial.print(LoRaWAN.getMaxPayloadSize());
        Serial.print(", DR: ");
        Serial.print(LoRaWAN.getDataRate());
        Serial.print(", TxPower: ");
        Serial.print(LoRaWAN.getTxPower(), 1);
        Serial.print("dbm, UpLinkCounter: ");
        Serial.print(LoRaWAN.getUpLinkCounter());
        Serial.print(", DownLinkCounter: ");
        Serial.print(LoRaWAN.getDownLinkCounter());
        Serial.println(" )");

        LoRaWAN.beginPacket();
        LoRaWAN.write(0xef);
        LoRaWAN.write(0xbe);
        LoRaWAN.write(0xad);
        LoRaWAN.write(0xde);
        LoRaWAN.endPacket();

    }

    delay(10000);
}

I don't know if I did the right way (I think some code is not need, advices are welcome :) )but at least it works.

Is there any way to get the frequency used for current transmit ?

Regards

@GrumpyOldPizza
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GrumpyOldPizza commented Jul 25, 2018 via email

@battosai30
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battosai30 commented Jul 25, 2018 •
edited

Sorry to be so slow. Seems you figured it out.

One day is not at all what I would call slow xD you're framework is so reliable and clean, I gained so much time that I would forgive you anything now !

In general, I'd recommend actually reading the spec before guessing ...
https://www.lora-alliance.org/resource-hub

I will take the time to read it well now that I have tested a lot of things and have a clearer view on LoRaWAN.

Just one last point : I did not find where I could activate ack request ?

@GrumpyOldPizza
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GrumpyOldPizza commented Jul 25, 2018 via email

@battosai30
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So simple ... And if endPacket(true) is used, I just have to do something like this ?

 while (LoRaWAN.busy())
    {
    }

    if (LoRaWAN.confirmed())
    {
      debug.println("ACK");
    }
    else
    {
      debug.println("NACK");
    }

@GrumpyOldPizza
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GrumpyOldPizza commented Jul 25, 2018 via email

@battosai30
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Ok so what could I do in ABP mode to check at least that a gateway is in the range ? At least I would check the link during start up

@GrumpyOldPizza
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GrumpyOldPizza commented Jul 26, 2018 via email

@battosai30 battosai30 mentioned this issue Jun 5, 2020
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@battosai30 @GrumpyOldPizza