LoRa receive windows

  • Hello,

    In the example of LoRaWAN with OTAA join method

    # code block
    #make the socket blocking
    #(waits for the data to be sent and for the 2 receive windows to expire)

    i have two questions :
    What is the time of the two receive windows because when I try to put this before sending an unconfirmed LoRa frame it takes 1 to 2 seconds between sending two frames?

    Can i define the duration of the two windows manually or it will be done automatically by adding socket.setblocking(True) ?

  • @jmarcelino said in LoRa receive windows:
    thank you it is clear now

  • @assia
    In raw LoRa mode there are no set receive windows, once you call lora.recv(..) it should start receiving.

  • Hi @jmarcelino thanks for your response, I am a beginner in lora; and my objective is to make a communication between two nodes (lopy) in loRa mode
    So I want to know if these settings are the same if we work in LoRa mode and not LoRaWAN? because if we take into account the two reception windows of LoRaWan normally it takes all the time 2 seconds between sending 2 non confirmed msg. but in my example (LoRa mode) it takes 1 to 2 seconds between sending 2 frames.

  • The receive window timings of LoRaWAN are defined in the LoRaWAN specification, namely in the regional settings document.

    For the EU 868 Mhz region:

    First receive window 1s
    Second receive window 2s

    OTAA Join accept has different windows (at 5s and 6s)

    There isn't a specific value for the window duration, the stack will listen for a packet preamble indicating there is data to receive and if so the window will be kept open until all the data is received (maximum 3s)

    You cannot change this on the LoPy other than changing and source code and flashing it with a custom build - then you'll also have to make sure your network server knows about those settings. Alternatively the network server can also change the receive window timings in the OTAA response.

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