#  nfc-scan-device -i -v
debug	libnfc.general	log_level is set to 3
debug	libnfc.general	allow_autoscan is set to false
debug	libnfc.general	allow_intrusive_scan is set to true
debug	libnfc.general	1 device(s) defined by user
debug	libnfc.general	  #0 name: "seedstudio", connstring: "pn532_uart:/dev/ttyUSB0"
nfc-scan-device uses libnfc 1.7.0
1 NFC device(s) found:
debug	libnfc.driver.pn532_uart	Attempt to open: /dev/ttyUSB0 at 115200 bauds.
debug	libnfc.bus.uart	Serial port speed requested to be set to 115200 bauds.
debug	libnfc.chip.pn53x	Diagnose
debug	libnfc.chip.pn53x	Timeout value: 500
debug	libnfc.bus.uart	TX: 55 55 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
debug	libnfc.chip.pn53x	SAMConfiguration
debug	libnfc.chip.pn53x	Timeout value: 1000
debug	libnfc.bus.uart	TX: 00 00 ff 03 fd d4 14 01 17 00 
debug	libnfc.bus.uart	Timeout!
debug	libnfc.driver.pn532_uart	Unable to read ACK
pn53x_check_communication: Timeout
debug	libnfc.chip.pn53x	InRelease
debug	libnfc.bus.uart	TX: 00 00 ff 03 fd d4 52 00 da 00 
debug	libnfc.bus.uart	Timeout!
debug	libnfc.driver.pn532_uart	Unable to read ACK
debug	libnfc.general	Unable to open "pn532_uart:/dev/ttyUSB0".
nfc_open failed for pn532_uart:/dev/ttyUSB0