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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _initialize(self):
 """Sends the initialization packet to the roaster."""

        self._header.value = b'\xAA\x55'
        self._current_state.value = b'\x00\x00'
        s = self._generate_packet()
        self._ser.write(s)
        self._header.value = b'\xAA\xAA'
        self._current_state.value = b'\x02\x01'

        return self._read_existing_recipe()