def create_packet(raw, operating_mode):
"""
Override method.
Returns:
RXIPv4Packet.
Raises:
InvalidPacketException: if the bytearray length is less than 15. (start delim + length (2 bytes) + frame
type + source address (4 bytes) + dest port (2 bytes) + source port (2 bytes) + network protocol +
status + checksum = 15 bytes)
InvalidPacketException: if the length field of ``raw`` is different than its real length. (length field:
bytes 2 and 3)
InvalidPacketException: if the first byte of ``raw`` is not the header byte. See :class:`.SPECIAL_BYTE`.
InvalidPacketException: if the calculated checksum is different than the checksum field value (last byte).
InvalidPacketException: if the frame type is not :attr:`ApiFrameType.RX_IPV4`.
InvalidOperatingModeException: if ``operating_mode`` is not supported.
.. seealso::
| :meth:`.XBeePacket.create_packet`
| :meth:`.XBeeAPIPacket._check_api_packet`
"""
if operating_mode != OperatingMode.ESCAPED_API_MODE and operating_mode != OperatingMode.API_MODE:
raise InvalidOperatingModeException(operating_mode.name + " is not supported.")
XBeeAPIPacket._check_api_packet(raw, min_length=RXIPv4Packet.__MIN_PACKET_LENGTH)
if raw[3] != ApiFrameType.RX_IPV4.code:
raise InvalidPacketException("This packet is not an RXIPv4Packet.")
return RXIPv4Packet(IPv4Address(bytes(raw[4:8])), utils.bytes_to_int(raw[8:10]),
utils.bytes_to_int(raw[10:12]), IPProtocol.get(raw[12]),
raw[14:-1])
def create_packet(raw, operating_mode):
"""
Override method.
Returns:
TXIPv4Packet.
Raises:
InvalidPacketException: if the bytearray length is less than 16.
(start delim + length (2 bytes) + frame type + frame id
+ dest address (4 bytes) + dest port (2 bytes)
+ source port (2 bytes) + network protocol + transmit options
+ checksum = 16 bytes)
InvalidPacketException: if the length field of `raw` is different
from its real length. (length field: bytes 2 and 3)
InvalidPacketException: if the first byte of `raw` is not the
header byte. See :class:`.SPECIAL_BYTE`.
InvalidPacketException: if the calculated checksum is different
from the checksum field value (last byte).
InvalidPacketException: if the frame type is not
:attr:`ApiFrameType.TX_IPV4`.
InvalidOperatingModeException: if `operating_mode` is not supported.
.. seealso::
| :meth:`.XBeePacket.create_packet`
| :meth:`.XBeeAPIPacket._check_api_packet`
"""
if operating_mode not in (OperatingMode.ESCAPED_API_MODE,
OperatingMode.API_MODE):
raise InvalidOperatingModeException(op_mode=operating_mode)
XBeeAPIPacket._check_api_packet(
raw, min_length=TXIPv4Packet.__MIN_PACKET_LENGTH)
if raw[3] != ApiFrameType.TX_IPV4.code:
raise InvalidPacketException(
message="This packet is not an TXIPv4Packet.")
return TXIPv4Packet(
raw[4],
IPv4Address(bytes(raw[5:9])),
utils.bytes_to_int(raw[9:11]),
utils.bytes_to_int(raw[11:13]),
IPProtocol.get(raw[13]),
raw[14],
data=raw[15:-1]
if len(raw) > TXIPv4Packet.__MIN_PACKET_LENGTH else None,
op_mode=operating_mode)