def __init__(self, portnum=None, callbacks=[]):
self.portnum = portnum
self.exit = False
try:
self.uart = UART.Uart(portnum)
except serial.SerialException as e:
logging.exception("Error opening UART.")
self.uart = UART.Uart()
self.packetCounter = 0
self.lastReceivedPacketCounter = 0
self.lastReceivedPacket = None
