Uplink inconsistent data loss

Hi team,
I am facing a new strange issue which I don’t know how to troubleshoot. Our sensors are configured to send uplink in fport 2, but the uplink is sent via both fport2 where I have my payload and most of the time in fPort0 where my data is null, may I know why the uplink is being sent to fPort0 when it is about to send all uplink via fPort2 ?? I have checked the console logs of end device, it is sending in fPort2 but LNS side it is showing fPort0…Thanks, Please help

Hi, I have seen fport0 with null data when device exceeds the maimum payload size for given datarate. I did not really dig into why is that as the primary problem is obviously the device sending more data than allowed.

Thanks for the reply, My gateway is receiving the proper data from the node but when it comes to LNS, I am facing this issue , I have attached the logs of the gateway and the chirpsack LNS below, the LNS is not getting the payload and the value is in fport 0

gateway Log:
Mar 17 04:01:25 Wirnet local1.notice spf: INFO: Received pkt from mote: 0144B2D1 (fcnt=8082)
Mar 17 04:01:25 Wirnet local1.notice spf: JSON up: {“rxpk”:[{“tmst”:2886157884,“chan”:7,“rfch”:1,“freq”:923.400000,“stat”:1,“modu”:“LORA”,“datr”:“SF10BW125”,“codr”:“4/5”,“lsnr”:11.8,“rssi”:-70,“size”:19,“data”:“QNGyRAGAkh8A0xMqt0ZMU34lZQ==”}]}
Mar 17 04:01:25 Wirnet local1.notice spf: INFO: [up] PUSH_ACK received in 2 ms
Mar 17 04:01:25 Wirnet local1.notice spf: INFO: [down] PULL_RESP received - token[29:219] :slight_smile:
Mar 17 04:01:25 Wirnet local1.notice spf: JSON down: {“txpk”:{“imme”:false,“rfch”:0,“powe”:14,“ant”:0,“brd”:0,“tmst”:2887157884,“freq”:923.4,“modu”:“LORA”,“datr”:“SF10BW125”,“codr”:“4/5”,“ipol”:true,“size”:24,“data”:“YNGyRAGMHx8NMER8TZcDUwcAAQa7V0hl”}}

Chirpstack LNS Log:

{
    "type": "uplink",
    "payload": {
        "adr": true,
        "applicationID": "1",
        "applicationName": "sptel-app-2",
        "data": null,
        "devEUI": "0a0101010101010a",
        "deviceName": "ratsensenew1",
        "fCnt": 8082,
        "fPort": 0,
        "object": {
            "battery": "NaN",
            "hum": "NaN",
            "period": "0 sec",
            "temp": "-46.85"
        },
        "rxInfo": [
            {
                "gatewayID": "7276ff000b031eba",
                "loRaSNR": 11.8,
                "location": {
                    "altitude": 0,
                    "latitude": 1.390624,
                    "longitude": 103.846459
                },
                "name": "slioilc000lg001-2037",
                "rssi": -70,
                "uplinkID": "345c41ef-c62c-42ff-b1c7-0ced2ec6c01f"
            }
        ],
        "txInfo": {
            "dr": 2,
            "frequency": 923400000
        }
    }
}

Please help, I am struggling with this issue for long time :frowning: