How to receive a message back from gateway

End Devices (Nodes) LMIC
1

Hi,

This is my first topic here an am very new to Lora and TTN. I have custom designed a gateway (using RAK831) and a node (using a 328 microcontroller) and using LMiC arduino program. After a little research, I am finally able to send messages from Node to gateway on ABP.

Now, for the question:

  1. I need to know if there is a way to receive message back from the gateway. I have read about downlink, but when I send few bytes from Downlink window on the application page, it says “sent”, but there is nothing I see on the arduino window. However, on the application window on TTN page, it says “confirmed
    payload:FFEE”. What am I missing here?
  2. I am from India and have used 865062500, 865402500 and 865985000 as the frequency. However, the messages are always sent on 865062500. Even when I add two nodes, the result is still the same.

Since I have just started, I have a lot more questions. Will solve these issues and get back to you for more help. If you need more information to help, kindly revert.

Thanks,
Praveen

2
  1. Check the transmit/receive cycle for class A nodes. That should clarify things.
  2. The TTN back-end instructs the gateway which frequency to use when transmitting. That is not something you can configure on the gateway.
3

Thanks for answer 2. However, the first answer left me pulling my hair. I understood nothing. Since I do not know much about programming or TTN network and the program, would be really helpful if you could elaborate a bit.

Thanks,
Praveen

4

Do you know the difference between classes A, B and C? If not read the LoRaWAN specification.

Can you post a screenshot of the message in the TTN console?

5

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