Getting 2 downlink messages but sending only one by LoRa Server API

ChirpStack Application Server
1

Dear all,

I’m using a setup of 5 gateways, and by using the LoRa Server API I’m sending one Downlink Message, but in LoRa APP server I’m getting two downlink messages,

1st : UnconfirmedDataDown on fport null?? whats a null port?
2nd: ConfirmedDataDown on fport 7, thats my assigned port!!!

Please help me on this!

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2

Please consult the LoRaWAN specification. A frame without fPort (null) is valid. Probably that frame contains mac-commands in the fOpts field (under fhdr key), or it contains an acknowledgement.

3

Thanks @brocaar sir,
I found the problem, that was due to the high ADR bit that was sent from my device!