Have problem with frequency Downlink

lehungmt94 · October 15, 2020, 3:11am

I run Chirpstack on Docker. I want to use Lorawan with 433Mhz. I set [Gateway-profiles] is 433mHz SF=7 BW=125kHz

Uplink is working but downlink is not. In Json send from Chirpstack Server to my Gateway is missing frequency for tx packet and Spreading-factors always SF12
This is log pkt_fwd of my gateway

 RXTX~ (TXPKT): [down] {"txpk":{"imme":true,"rfch":0,"powe":14,"ant":0,"brd":0,"freq":0,"modu":"LORA","datr":"SF12BW125","codr":"4/5","ipol":true,"size":44,"data":"YHUXASaABgAAAcl18DRuNfjLK8ZmlkuVesmfma4ut/xdk2LfBOMijpcsHRc="}}
RXTX~ (TXPKT): [down] {"txpk":{"imme":true,"rfch":0,"powe":14,"ant":0,"brd":0,"freq":0,"modu":"LORA","datr":"SF12BW125","codr":"4/5","ipol":true,"size":18,"data":"oHUXASaQCAABylddExkfO2H8"}}

This is log on Chirpstack server
https://imgur.com/JCqtbuh

github.com

lehungmt94/STM8S003-Sample-Project/blob/master/gateway-da1ea43466778888.json

[
    {
        "uplinkMetaData": {
            "rxInfo": [
                {
                    "gatewayID": "2h6kNGZ3iIg=",
                    "time": "2020-10-15T07:57:21.060465Z",
                    "timeSinceGPSEpoch": null,
                    "rssi": -56,
                    "loRaSNR": 11,
                    "channel": 0,
                    "rfChain": 1,
                    "board": 0,
                    "antenna": 0,
                    "location": {
                        "latitude": 16.059596799999998,
                        "longitude": 108.20976639999999,
                        "altitude": 20,
                        "source": "UNKNOWN",
                        "accuracy": 0

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Downlink with ACK send by Chirpstack Server is correct freq 433mHz, but Donwlink data send by user have freq 0mHz

eugenev · October 15, 2020, 9:53am

is the LoRaWAN regional band selected correctly in your chirpstack-network-server.toml ?

lehungmt94 · October 16, 2020, 2:19am

Thank you @ eugenev This is my chirpstack-network-server.toml file
# See https://www.chirpstack.io/network-server/install/config/ for a full
# configuration example and documentation.
#
# This file is for the EU433 band. See the examples/ folder for more
# configuration examples.

[postgresql]
dsn="postgres://chirpstack_ns:chirpstack_ns@postgresql/chirpstack_ns?sslmode=disable"

[redis]
url="redis://redis:6379"

[network_server]
net_id="000000"

[network_server.band]
name="EU433"

[network_server.network_settings]

  [[network_server.network_settings.extra_channels]]
  frequency=433000000
  min_dr=0
  max_dr=12

  [[network_server.network_settings.extra_channels]]
  frequency=433175000
  min_dr=0
  max_dr=12

  enabled_uplink_channels=[0,1,2,3]

[network_server.gateway.backend.mqtt]
server="tcp://mosquitto:1883"

[join_server.default]
server="http://chirpstack-application-server:8003"

[geolocation_server]
server="chirpstack-geolocation-server:8005"

I don’t know why Downlink for auto ACK packet is have right frequency 433Mhz, but Downlink queue data send by user always have frequency 0Mhz. I saw it in txInfo.

eugenev · October 16, 2020, 7:52am

datarate number is not equal spreading factor

lehungmt94 · October 16, 2020, 8:16am

I changed it like this. is it correct?
min_dr=0
max_dr=5

frequency:0

brocaar · October 19, 2020, 1:51pm

Please check your device-profile. A common mistake is to leave the RX2 freq. set to 0. For ABP devices, the properties set in the device-profile are used (and ChirpStack will align with the global config later using mac-commands). After making changes to the device-profile, make sure to re-activate your ABP device!