MTCDT-210L + MTAC-LORA-915 + RN2903A

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  • January 5, 2018 at 2:47 am #22233
    Pawel Pawel
    Participant

    Hi
    I run the set for US 915MHz and I have some problems with OTAA joining. On RN2903 I only launched 8 (from available 64) channels the same as in Conduit global_conf_json (from 903.9MHz to 904.6MHz like in TTN frequency plan). RN2903 for downlink communication frequency must be set (documentation) above the 923.3MHz (like in TTN frequency plan). With this channel settings Conduit can’t join in OTAA. Logs shows that gateway is seeing join requests (they are correct) and he is answering. Gateway is responding at the same frequency he receive the packet (logs shows that). From configuration RN2903 expects responds at frequencies above 923.3MHz but receives answers from the gateway at lower frequencies that it can not accept. I think that this is the problem but I can be wrong. I need help how to make proper US 915MHz global_conf_json to join in 915MHz OTAA with RN2903. Maybe only how to move the downlink frequencies to higher when uplink is at lower freqs. I’m definitely not the first who has this problem and I am asking for help how to deal with it.

    January 5, 2018 at 6:21 am #22234
    Jason Reiss
    Keymaster

    A US915 gateway does not respond with a downlink on the same frequency.

    Are you using TTN as network server?

    Be sure the channel plan chosen for the gateway is US915.

    January 5, 2018 at 7:03 am #22235
    Pawel Pawel
    Participant

    I am sure that frequency plan is US915. Every join request is seeing by the gateway. I am using LoRa Open Server by broocar and packet forwarder by Semtech. In my solution downlink frequency is always the same as uplink (from logs). For EU868 is good by for US915 is not. Whether the server sends the data to the gateway, determines the frequency of the downlink transmission? If yes LoRa Open Server is not for US915. There are no frequency settings.

    January 5, 2018 at 7:22 am #22236
    Jason Reiss
    Keymaster

    The network server controls the gateway transmit channels, and sends the frequency/datarate/timestamp/payload to the gateway for downlink.

    The gateway configuration controls the gateway receive channels.

    January 8, 2018 at 1:15 am #22261
    Pawel Pawel
    Participant

    Thanks for request. I have my answer.

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