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 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.