$ ./util_pkt_logger
loragw_pkt_logger: INFO: found global configuration file global_conf.json, trying to parse it
loragw_pkt_logger: INFO: global_conf.json does contain a JSON object named SX1301_conf, parsing SX1301 parameters
loragw_pkt_logger: INFO: lorawan_public 1, clksrc 1
loragw_pkt_logger: INFO: radio 0 enabled (type SX1257), center frequency 867500000, RSSI offset -166.000000, tx enabled 1
loragw_pkt_logger: INFO: radio 1 enabled (type SX1257), center frequency 868500000, RSSI offset -166.000000, tx enabled 0
loragw_pkt_logger: INFO: LoRa multi-SF channel 0 enabled, radio 1 selected, IF -400000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 1 enabled, radio 1 selected, IF -200000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 2 enabled, radio 1 selected, IF 0 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 3 enabled, radio 0 selected, IF -400000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 4 enabled, radio 0 selected, IF -200000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 5 enabled, radio 0 selected, IF 0 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 6 enabled, radio 0 selected, IF 200000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa multi-SF channel 7 enabled, radio 0 selected, IF 400000 Hz, 125 kHz bandwidth, SF 7 to 12
loragw_pkt_logger: INFO: LoRa standard channel enabled, radio 1 selected, IF -200000 Hz, 250000 Hz bandwidth, SF 7
loragw_pkt_logger: INFO: FSK channel enabled, radio 1 selected, IF 300000 Hz, 125000 Hz bandwidth, 50000 bps datarate
loragw_pkt_logger: INFO: global_conf.json does contain a JSON object named gateway_conf, parsing gateway parameters
loragw_pkt_logger: INFO: gateway MAC address is configured to AA555A0000000000
loragw_pkt_logger: INFO: found local configuration file local_conf.json, trying to parse it
loragw_pkt_logger: INFO: local_conf.json does not contain a JSON object named SX1301_conf
loragw_pkt_logger: INFO: local_conf.json does contain a JSON object named gateway_conf, parsing gateway parameters
loragw_pkt_logger: INFO: gateway MAC address is configured to AA555A0000000101
loragw_pkt_logger: ERROR: failed to start the concentrator