After send a downlink, the device shows: error: TX_FREQ

vitoriabaratella · February 16, 2023, 12:44am

Good night.

When I’ve tried to send a downlink to an end device connected to MikroTik wAP LR9 with the Network Server ChirpStack, I saw the following error on Device Data:

error: “TX_FREQ”.

Someone nows what this error is?

I don’t know what to do, and nothing on the foruns solved my problem.

Tnks

bconway · February 16, 2023, 1:58am

Does this help?

github.com

chirpstack/chirpstack/blob/master/api/proto/gw/gw.proto#L85


      
          
          
// Rejected because downlink packet timestamp is too much in advance.
          TOO_EARLY = 3;
          
          
// Rejected because there was already a packet programmed in requested timeframe.
          COLLISION_PACKET = 4;
          
          
// Rejected because there was already a beacon planned in requested timeframe.
          COLLISION_BEACON = 5;
          
          
// Rejected because requested frequency is not supported by TX RF chain.
          TX_FREQ = 6;
          
          
// Rejected because requested power is not supported by gateway.
          TX_POWER = 7;
          
          
// Rejected because GPS is unlocked, so GPS timestamp cannot be used.
          GPS_UNLOCKED = 8;
          
          
// Downlink queue is full.
          QUEUE_FULL = 9;

vitoriabaratella · February 16, 2023, 12:44pm

Hello!
Thank you
But how can I know de downlink frequency being requested? And how can I change it?

Jason_Reiss · February 17, 2023, 10:18pm

If you are using UDP forwarder the global conf has tx min/max for allow tx range. The gw will validate the requested frequency is in range.

github.com

Lora-net/packet_forwarder/blob/master/lora_pkt_fwd/global_conf.json

{
    "SX1301_conf": {
        "lorawan_public": true,
        "clksrc": 1, /* radio_1 provides clock to concentrator */
        "lbt_cfg": {
            "enable": false,
            "rssi_target": -80, /* dBm */
            "chan_cfg":[ /* 8 channels maximum */
                { "freq_hz": 867100000, "scan_time_us": 128 },
                { "freq_hz": 867300000, "scan_time_us": 5000 },
                { "freq_hz": 867500000, "scan_time_us": 128 },
                { "freq_hz": 869525000, "scan_time_us": 128 }
            ],
            "sx127x_rssi_offset": -4 /* dB */
        },
        "antenna_gain": 0, /* antenna gain, in dBi */
        "radio_0": {
            "enable": true,
            "type": "SX1257",
            "freq": 867500000,

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Basic Station will validate based on the region sent from the LNS.