pi@raspberrypi:~/rak_common_for_gateway $ sudo systemctl status ttn-gateway
? ttn-gateway.service - The Things Network Gateway
   Loaded: loaded (/lib/systemd/system/ttn-gateway.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2019-11-07 15:44:18 GMT; 41s ago
 Main PID: 14332 (start.sh)
    Tasks: 8 (limit: 2200)
   Memory: 1.3M
   CGroup: /system.slice/ttn-gateway.service
           +-14332 /bin/bash /opt/ttn-gateway/packet_forwarder/lora_pkt_fwd/start.sh
           +-14372 ./lora_pkt_fwd

Nov 07 15:44:56 rak-gateway ttn-gateway[14332]: WARNING: [gps] read() returned value 0
Nov 07 15:44:57 rak-gateway ttn-gateway[14332]: WARNING: [gps] read() returned value 0
Nov 07 15:44:57 rak-gateway ttn-gateway[14332]: WARNING: [gps] read() returned value 0
Nov 07 15:44:57 rak-gateway ttn-gateway[14332]: WARNING: [gps] read() returned value 0
Nov 07 15:44:59 rak-gateway ttn-gateway[14332]: WARNING: [gps] read() returned value 0
Nov 07 15:44:59 rak-gateway ttn-gateway[14332]: INFO: Received pkt from mote: D0021105 (fcnt=46037)
Nov 07 15:44:59 rak-gateway ttn-gateway[14332]: JSON up: {"rxpk":[{"tmst":37237028,"chan":1,"rfch":1,"freq":868.300000,"stat":1,"modu":"LORA","datr":"
Nov 07 15:44:59 rak-gateway ttn-gateway[14332]: WARNING: [gps] read() returned value 0
Nov 07 15:44:59 rak-gateway ttn-gateway[14332]: WARNING: [gps] read() returned value 0
Nov 07 15:44:59 rak-gateway ttn-gateway[14332]: WARNING: [gps] read() returned value 0