Fields in up messages from MQTT

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  • March 15, 2024 at 2:11 pm #33625
    kirill.chugunov01@mail.ru
    Participant

    Hello,

    I would like to a bit description for up messages from MQTT.
    I’ve read the article MQTT Messages. There have descriptions of messages from MQTT. But I didn’t found few fields. Can I have desriptions for these? I am about fields:

    • nonce (I found in join_request & packet_recv topics)
    • ipol (I found in the packet_sent topic)
    • ncrc (I found in the packet_sent topic)
    • powe (I found in the packet_sent topic)
    • twnd (I found in the packet_sent topic)

    Also, I would like to get more deeply description for these fields:

    • rfch (I don’t understand what this)
    • fcnt & seqn (Why Multitech send packet sequence number of different bit size? )
    • cls (What does show this control byte?)

    Thanks and Regards
    Kirill

    June 13, 2024 at 6:05 pm #33644
    Jason Reiss
    Keymaster

    Fields not listed below are packet forwarder protocol
    https://github.com/Lora-net/sx1302_hal/blob/master/packet_forwarder/PROTOCOL.md

    Nonce is devnonce in a join request
    Twnd is the rx window the device is receiving the packet. RX1 1, RX2 2, RXC 3, RXB 4

    Fcnt is the 16 bit FCnt in the lorawan frame semt over the air
    Seqn is the 32 bit full counter used for MIC and decryption
    Cls is a bit in FCtrl byte that signifies Class A if 0 or Class B device if 1

    June 13, 2024 at 6:08 pm #33645
    Jason Reiss
    Keymaster

    You can read more about fcnt and fctrl in the spec.
    https://resources.lora-alliance.org/technical-specifications/ts001-1-0-4-lorawan-l2-1-0-4-specification

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