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packet_type: MqttControlPacketType
flags: int
Integer representation of 4-bit MQTT header flags field.
Values outside of the range [0, 15] will certainly cause the
function to return False.
Returns
-------
bool
""""""
if packet_type == MqttControlPacketType.publish:
rv = 0 <= flags <= 15
elif packet_type in (MqttControlPacketType.pubrel,
MqttControlPacketType.subscribe,
MqttControlPacketType.unsubscribe):
rv = flags == 2
elif packet_type in (MqttControlPacketType.connect,
MqttControlPacketType.connack,
MqttControlPacketType.puback,
MqttControlPacketType.pubrec,
MqttControlPacketType.pubcomp,
MqttControlPacketType.suback,
MqttControlPacketType.unsuback,
MqttControlPacketType.pingreq,
MqttControlPacketType.pingresp,
MqttControlPacketType.disconnect):
rv = flags == 0
else:
raise NotImplementedError(packet_type)
return rv"
1168,"def decode(f):
""""""Extract a `MqttFixedHeader` from ``f``.
Parameters
----------
f: file
Object with read method.
Raises
-------
DecodeError
When bytes decoded have values incompatible with a
`MqttFixedHeader` object.
UnderflowDecodeError
When end-of-stream is encountered before the end of the
fixed header.
Returns
-------
int
Number of bytes consumed from ``f``.
MqttFixedHeader
Header object extracted from ``f``.
""""""
decoder = mqtt_io.FileDecoder(f)
(byte_0,) = decoder.unpack(mqtt_io.FIELD_U8)
packet_type_u4 = (byte_0 >> 4)
flags = byte_0 & 0x0f
try:
packet_type = MqttControlPacketType(packet_type_u4)
except ValueError:
raise DecodeError('Unknown packet type 0x{:02x}.'.format(packet_type_u4))
if not are_flags_valid(packet_type, flags):
raise DecodeError('Invalid flags for packet type.')
num_bytes, num_remaining_bytes = decoder.unpack_varint(4)
return decoder.num_bytes_consumed, MqttFixedHeader(packet_type, flags, num_remaining_bytes)"
1169,"def encode_body(self, f):
""""""
Parameters
----------
f: file
File-like object with a write method.
Returns
-------
int
Number of bytes written to ``f``.
""""""
num_bytes_written = 0
num_bytes_written += self.__encode_name(f)
num_bytes_written += self.__encode_protocol_level(f)
num_bytes_written += self.__encode_connect_flags(f)
num_bytes_written += self.__encode_keep_alive(f)
num_bytes_written += mqtt_io.encode_utf8(self.client_id, f)
if self.will is not None:
num_bytes_written += mqtt_io.encode_utf8(self.will.topic, f)
num_bytes_written += mqtt_io.encode_bytes(self.will.message, f)
if self.username is not None:
num_bytes_written += mqtt_io.encode_utf8(self.username, f)
if self.password is not None: