Imports periph.io/x/periph/host/rpi periph.io/x/conn/v3/gpio/gpioreg periph.io/x/host/v3 periph.io/x/conn/v3/gpio periph.io/x/periph/conn/spi periph.io/x/periph/conn/spi/spireg periph.io/x/periph/experimental/devices/mfrc522 periph.io/x/periph/host Standard library imports encoding/hex log time