nfc-scan-device -i -v debug libnfc general log_level is set to debug l

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# 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