Schedule data downlink for tramission on Gateway Server issue

tiennm
Mon, 21 Nov 2022 16:16:48 +0000
Generic Node

Hi everyone,

I’m new to TTN and have build a LoraWAN Node with ESP32 Board (LMIC Library). I have a question about Schedule data downlink for tramission on Gateway Server. My Node only sends data to TTN, but sometime it receives Schedule data downlink for tramission on Gateway Server (RX Delay:5, althought i didn’t send a downlink message) and then automatically sends a message with Data rate, SNR, RSSI back (without payload?). Could anyone please explain for me, where the downlink message from is and why my Node received that as well as sended a uplink message without payload back? Thank you very much!!!

Downlink message, i also didn’t understand here UNCONFIRMED_DOWN, etc…

{
  "name": "ns.down.data.schedule.attempt",
  "time": "2022-11-21T14:59:15.214272006Z",
  "identifiers": [
    {
      "device_ids": {
        "device_id": "eui-70b3f",
        "application_ids": {
          "application_id": "esp32lo"
        },
        "dev_eui": "70D005205F",
        "join_eui": "70B3D12D2F",
        "dev_addr": "2612"
      }
    }
  ],
  "data": {
    "@type": "type.googleapis.com/ttn.lorawan.v3.DownlinkMessage",
    "raw_payload": "YBL1CyaFoAADUf8AAQ1i2rw=",
    "payload": {
      "m_hdr": {
        "m_type": "UNCONFIRMED_DOWN"
      },
      "mic": "DWLavA==",
      "mac_payload": {
        "f_hdr": {
          "dev_addr": "26012",
          "f_ctrl": {
            "adr": true
          },
          "f_cnt": 160,
          "f_opts": "A1H/AAE="
        },
        "full_f_cnt": 160
      }
    },
    "request": {
      "downlink_paths": [
        {
          "uplink_token": "CiYKJAoYc3RhZHRibAxEghwdv8AVgUIdBCLrMOyARoMCMKk7psGEMu3mPgCIPi1kN7y1BEqDAjCpO6bBhDA4sLdAg=="
        },
        {
          "uplink_token": "CiYKJAoYc3RhZHRib25uLTA0Eghwdv8AVgUJbBDzzf+DBxoMCMKk7psGEJOStfcCILjK+Jz3sisqDAjCpO6bBhDA4sLdAg=="
        },
        {
          "uplink_token": "CiYKJAoYc3RhZHRib25uLXN3YiEghwdv8AVgUGkhDj9ZCTBhoMCMKk7psGEIThz/MCILiNmLyFus0BKgwIwqTumwYQwOLC3QI="
        },
        {
          "uplink_token": "CiYKJAoYc3RhZHRib25uLXN3Yi1nhwdv8AVgUJaRDrm9tFGgwIwqTumwYQ27D88gIg+LvR0KD2VyoMCMKk7psGEMDiwt0C"
        }
      ],
      "rx1_delay": 5,
      "rx1_data_rate": {
        "lora": {
          "bandwidth": 125000,
          "spreading_factor": 7,
          "coding_rate": "4/5"
        }
      },
      "rx1_frequency": "867300000",
      "rx2_data_rate": {
        "lora": {
          "bandwidth": 125000,
          "spreading_factor": 9,
          "coding_rate": "4/5"
        }
      },
      "rx2_frequency": "869525000",
      "priority": "HIGHEST",
      "frequency_plan_id": "EU_863_870_TTN"
    },
    "correlation_ids": [
      "gs:conn:01GJ1XRT1RGS7J3CJF0NRCBRG6",
      "gs:up:host:01GJ1XRT22T86161PJRCN95RXR",
      "gs:uplink:01GJDB6N6TK0E63M2CZ1EMAEWS",
      "ns:downlink:01GJDB6NMEQ8NY6ZXJAN7KK3FX",
      "ns:transmission:01GJDB6NMEW4HVWDBM43N71WCN",
      "ns:uplink:01GJDB6N6VSSYC5NZH6X8G4FC6",
      "rpc:/ttn.lorawan.v3.GsNs/HandleUplink:01GJDB6N6T2PQSMTSC7TP3CQ58"
    ]
  },
  "correlation_ids": [
    "gs:conn:01GJ1XRT1RGS7J3CJF0NRCBRG6",
    "gs:up:host:01GJ1XRT22T86161PJRCN95RXR",
    "gs:uplink:01GJDB6N6TK0E63M2CZ1EMAEWS",
    "ns:downlink:01GJDB6NMEQ8NY6ZXJAN7KK3FX",
    "ns:transmission:01GJDB6NMEW4HVWDBM43N71WCN",
    "ns:uplink:01GJDB6N6VSSYC5NZH6X8G4FC6",
    "rpc:/ttn.lorawan.v3.GsNs/HandleUplink:01GJDB6N6T2PQSMTSC7TP3CQ58"
  ],
  "origin": "ip-10-100-5-146.eu-west-1.compute.internal",
  "context": {
    "tenant-id": "CgN0dG4="
  },
  "visibility": {
    "rights": [
      "RIGHT_APPLICATION_TRAFFIC_READ"
    ]
  },
  "unique_id": "01GJDB6NME1TCAXWWZRX3041KK"
}

3 posts - 3 participants