<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def read(self):
 """Read data from serial port and returns a ``bytearray``."""

        data = bytearray()
        while True:
            incoming_bytes = self.comport.inWaiting()
            if incoming_bytes == 0:
                break
            else:
                content = self.comport.read(size=incoming_bytes)
                data.extend(bytearray(content))
        return data