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 $ LIBNFC_LOG_LEVEL=3 ./nfc-anticol
info	libnfc.config	Unable to open file: /etc/nfc/libnfc.conf
debug	libnfc.config	key: [device.allow_autoscan], value: [false]
info	libnfc.config	Unknown key in config line: device.allow_autoscan = false
debug	libnfc.config	key: [device.log_level], value: [3]
info	libnfc.config	Unknown key in config line: device.log_level = 3
debug	libnfc.config	key: [device.name], value: [MFRC522]
debug	libnfc.config	key: [device.connstring], value: [rc522_uart:/dev/ttyUSB0]
debug	libnfc.general	log_level is set to 3
debug	libnfc.general	allow_autoscan is set to true
debug	libnfc.general	allow_intrusive_scan is set to false
debug	libnfc.general	1 device(s) defined by user
debug	libnfc.general	  #0 name: "MFRC522", connstring: "rc522_uart:/dev/ttyUSB0"
debug	libnfc.driver.rc522_uart	Attempt to open: /dev/ttyUSB0.
debug	libnfc.driver.rc522_uart	Attempting to establish a connection at 9600 bps.
debug	libnfc.bus.uart	Serial port speed requested to be set to 9600 baud.
debug	libnfc.bus.uart	TX: b7
debug	libnfc.bus.uart	RX: 12
debug	libnfc.chip.rc522	RD 37: 12
debug	libnfc.chip.rc522	Aborting self test for unknown version 12.
debug	libnfc.bus.uart	TX: 01
debug	libnfc.bus.uart	RX: 01
debug	libnfc.bus.uart	TX: 2f
debug	libnfc.chip.rc522	WR 01: 2f
debug	libnfc.driver.rc522_uart	Restoring baud rate to default of 9600 bps.
debug	libnfc.bus.uart	Serial port speed requested to be set to 9600 baud.
debug	libnfc.bus.uart	TX: 81
debug	libnfc.bus.uart	RX: 20
debug	libnfc.chip.rc522	RD 01: 20
debug	libnfc.driver.rc522_uart	Upgrading baud rate to user-specified 115200 bps.
debug	libnfc.bus.uart	Serial port speed requested to be set to 115200 baud.
debug	libnfc.bus.uart	TX: 1f
debug	libnfc.bus.uart	RX: 00
debug	libnfc.driver.rc522_uart	rc522_uart_write ack does not match (sent 1F, received 00)
error	libnfc.chip.rc522	Unable to write register 1F!
debug	libnfc.driver.rc522_uart	Attempting to establish a connection at 115200 bps.
debug	libnfc.bus.uart	Serial port speed requested to be set to 115200 baud.
debug	libnfc.bus.uart	TX: b7
debug	libnfc.bus.uart	RX: 00
debug	libnfc.chip.rc522	RD 37: 00
debug	libnfc.chip.rc522	Aborting self test for unknown version 00.
debug	libnfc.bus.uart	TX: 01
debug	libnfc.bus.uart	RX: 00
debug	libnfc.driver.rc522_uart	rc522_uart_write ack does not match (sent 01, received 00)
error	libnfc.chip.rc522	Unable to write register 01!
debug	libnfc.driver.rc522_uart	Could not connect with RC522 at 9600 or 115200 bps.
debug	libnfc.bus.uart	TX: 01
debug	libnfc.bus.uart	RX: 00
debug	libnfc.driver.rc522_uart	rc522_uart_write ack does not match (sent 01, received 00)
error	libnfc.chip.rc522	Unable to write register 01!
debug	libnfc.general	Unable to open "rc522_uart:/dev/ttyUSB0".
nfc-anticol: ERROR: Error opening NFC reader