Introduction

Dragino Gateway is possible to support Listen Before Talk feature with an external USB to LoRaWAN module (this module in under development).

How to use

Upgrade File

Upgrade the firmware to version higher than > lgw--build-v5.4.1603422765-20201023-1130 . Firmware download, Firmware Changelog

Modify file to support LBT

Modify the Frequendy band file. for LG308 and OLG01, please modify file under /etc/lora/cfg-301/, for LPS8, modify file under /etc/lora/cfg-308/.

File content modify like below:

"lbt_cfg": {
 "enable": false,      ---> Change this to true
 "rssi_target": -80,
 "chan_cfg":[
  { "freq_hz": 922000000, "scan_time_us": 128 },
  { "freq_hz": 922200000, "scan_time_us": 128 },
  { "freq_hz": 922400000, "scan_time_us": 128 },
  { "freq_hz": 922600000, "scan_time_us": 128 },
  { "freq_hz": 922800000, "scan_time_us": 128 },
  { "freq_hz": 923000000, "scan_time_us": 128 },
  { "freq_hz": 923200000, "scan_time_us": 128 },
  { "freq_hz": 923400000, "scan_time_us": 128 }      ----> These are the frequency to be monitored. please note, the frequency must from low to high. Above settings is not correct. 
     ],
 "sx127x_rssi_offset": -4
},

Test

Apply and save in the web after above configure has been made

run "logread -f" in linux to check the LBT running status.