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# Copyright 2021-2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
from __future__ import annotations
import struct
from dataclasses import dataclass, field
from typing import TypeVar
from bumble import hci, utils
class Opcode(utils.OpenIntEnum):
'''
See Bluetooth spec @ Vol 2, Part C - 5.1 PDU summary.
Follow the alphabetical order defined there.
'''
# fmt: off
LMP_ACCEPTED = 3
LMP_ACCEPTED_EXT = 127 << 8 + 1
LMP_AU_RAND = 11
LMP_AUTO_RATE = 35
LMP_CHANNEL_CLASSIFICATION = 127 << 8 + 17
LMP_CHANNEL_CLASSIFICATION_REQ = 127 << 8 + 16
LMP_CLK_ADJ = 127 << 8 + 5
LMP_CLK_ADJ_ACK = 127 << 8 + 6
LMP_CLK_ADJ_REQ = 127 << 8 + 7
LMP_CLKOFFSET_REQ = 5
LMP_CLKOFFSET_RES = 6
LMP_COMB_KEY = 9
LMP_DECR_POWER_REQ = 32
LMP_DETACH = 7
LMP_DHKEY_CHECK = 65
LMP_ENCAPSULATED_HEADER = 61
LMP_ENCAPSULATED_PAYLOAD = 62
LMP_ENCRYPTION_KEY_SIZE_MASK_REQ= 58
LMP_ENCRYPTION_KEY_SIZE_MASK_RES= 59
LMP_ENCRYPTION_KEY_SIZE_REQ = 16
LMP_ENCRYPTION_MODE_REQ = 15
LMP_ESCO_LINK_REQ = 127 << 8 + 12
LMP_FEATURES_REQ = 39
LMP_FEATURES_REQ_EXT = 127 << 8 + 3
LMP_FEATURES_RES = 40
LMP_FEATURES_RES_EXT = 127 << 8 + 4
LMP_HOLD = 20
LMP_HOLD_REQ = 21
LMP_HOST_CONNECTION_REQ = 51
LMP_IN_RAND = 8
LMP_INCR_POWER_REQ = 31
LMP_IO_CAPABILITY_REQ = 127 << 8 + 25
LMP_IO_CAPABILITY_RES = 127 << 8 + 26
LMP_KEYPRESS_NOTIFICATION = 127 << 8 + 30
LMP_MAX_POWER = 33
LMP_MAX_SLOT = 45
LMP_MAX_SLOT_REQ = 46
LMP_MIN_POWER = 34
LMP_NAME_REQ = 1
LMP_NAME_RES = 2
LMP_NOT_ACCEPTED = 4
LMP_NOT_ACCEPTED_EXT = 127 << 8 + 2
LMP_NUMERIC_COMPARISON_FAILED = 127 << 8 + 27
LMP_OOB_FAILED = 127 << 8 + 29
LMP_PACKET_TYPE_TABLE_REQ = 127 << 8 + 11
LMP_PAGE_MODE_REQ = 53
LMP_PAGE_SCAN_MODE_REQ = 54
LMP_PASSKEY_FAILED = 127 << 8 + 28
LMP_PAUSE_ENCRYPTION_AES_REQ = 66
LMP_PAUSE_ENCRYPTION_REQ = 127 << 8 + 23
LMP_PING_REQ = 127 << 8 + 33
LMP_PING_RES = 127 << 8 + 34
LMP_POWER_CONTROL_REQ = 127 << 8 + 31
LMP_POWER_CONTROL_RES = 127 << 8 + 32
LMP_PREFERRED_RATE = 36
LMP_QUALITY_OF_SERVICE = 41
LMP_QUALITY_OF_SERVICE_REQ = 42
LMP_REMOVE_ESCO_LINK_REQ = 127 << 8 + 13
LMP_REMOVE_SCO_LINK_REQ = 44
LMP_RESUME_ENCRYPTION_REQ = 127 << 8 + 24
LMP_SAM_DEFINE_MAP = 127 << 8 + 36
LMP_SAM_SET_TYPE0 = 127 << 8 + 35
LMP_SAM_SWITCH = 127 << 8 + 37
LMP_SCO_LINK_REQ = 43
LMP_SET_AFH = 60
LMP_SETUP_COMPLETE = 49
LMP_SIMPLE_PAIRING_CONFIRM = 63
LMP_SIMPLE_PAIRING_NUMBER = 64
LMP_SLOT_OFFSET = 52
LMP_SNIFF_REQ = 23
LMP_SNIFF_SUBRATING_REQ = 127 << 8 + 21
LMP_SNIFF_SUBRATING_RES = 127 << 8 + 22
LMP_SRES = 12
LMP_START_ENCRYPTION_REQ = 17
LMP_STOP_ENCRYPTION_REQ = 18
LMP_SUPERVISION_TIMEOUT = 55
LMP_SWITCH_REQ = 19
LMP_TEMP_KEY = 14
LMP_TEMP_RAND = 13
LMP_TEST_ACTIVATE = 56
LMP_TEST_CONTROL = 57
LMP_TIMING_ACCURACY_REQ = 47
LMP_TIMING_ACCURACY_RES = 48
LMP_UNIT_KEY = 10
LMP_UNSNIFF_REQ = 24
LMP_USE_SEMI_PERMANENT_KEY = 50
LMP_VERSION_REQ = 37
LMP_VERSION_RES = 38
# fmt: on
@classmethod
def parse_from(cls, data: bytes, offset: int = 0) -> tuple[int, Opcode]:
opcode = data[offset]
if opcode in (124, 127):
opcode = struct.unpack('>H', data)[0]
return offset + 2, Opcode(opcode)
return offset + 1, Opcode(opcode)
def __bytes__(self) -> bytes:
if self.value >> 8:
return struct.pack('>H', self.value)
return bytes([self.value])
@classmethod
def type_metadata(cls):
return hci.metadata(
{
'serializer': bytes,
'parser': lambda data, offset: (Opcode.parse_from(data, offset)),
}
)
class Packet:
'''
See Bluetooth spec @ Vol 2, Part C - 5.1 PDU summary
'''
subclasses: dict[int, type[Packet]] = {}
opcode: Opcode
fields: hci.Fields = ()
_payload: bytes = b''
_Packet = TypeVar("_Packet", bound="Packet")
@classmethod
def subclass(cls, subclass: type[_Packet]) -> type[_Packet]:
# Register a factory for this class
cls.subclasses[subclass.opcode] = subclass
subclass.fields = hci.HCI_Object.fields_from_dataclass(subclass)
return subclass
@classmethod
def from_bytes(cls, data: bytes) -> Packet:
offset, opcode = Opcode.parse_from(data)
if not (subclass := cls.subclasses.get(opcode)):
instance = Packet()
instance.opcode = opcode
else:
instance = subclass(
**hci.HCI_Object.dict_from_bytes(data, offset, subclass.fields)
)
instance.payload = data[offset:]
return instance
@property
def payload(self) -> bytes:
if self._payload is None:
self._payload = hci.HCI_Object.dict_to_bytes(self.__dict__, self.fields)
return self._payload
@payload.setter
def payload(self, value: bytes) -> None:
self._payload = value
def __bytes__(self) -> bytes:
return bytes(self.opcode) + self.payload
@Packet.subclass
@dataclass
class LmpAccepted(Packet):
opcode = Opcode.LMP_ACCEPTED
response_opcode: Opcode = field(metadata=Opcode.type_metadata())
@Packet.subclass
@dataclass
class LmpNotAccepted(Packet):
opcode = Opcode.LMP_NOT_ACCEPTED
response_opcode: Opcode = field(metadata=Opcode.type_metadata())
error_code: int = field(metadata=hci.metadata(1))
@Packet.subclass
@dataclass
class LmpAcceptedExt(Packet):
opcode = Opcode.LMP_ACCEPTED_EXT
response_opcode: Opcode = field(metadata=Opcode.type_metadata())
@Packet.subclass
@dataclass
class LmpNotAcceptedExt(Packet):
opcode = Opcode.LMP_NOT_ACCEPTED_EXT
response_opcode: Opcode = field(metadata=Opcode.type_metadata())
error_code: int = field(metadata=hci.metadata(1))
@Packet.subclass
@dataclass
class LmpAuRand(Packet):
opcode = Opcode.LMP_AU_RAND
random_number: bytes = field(metadata=hci.metadata(16))
@Packet.subclass
@dataclass
class LmpDetach(Packet):
opcode = Opcode.LMP_DETACH
error_code: int = field(metadata=hci.metadata(1))
@Packet.subclass
@dataclass
class LmpEscoLinkReq(Packet):
opcode = Opcode.LMP_ESCO_LINK_REQ
esco_handle: int = field(metadata=hci.metadata(1))
esco_lt_addr: int = field(metadata=hci.metadata(1))
timing_control_flags: int = field(metadata=hci.metadata(1))
d_esco: int = field(metadata=hci.metadata(1))
t_esco: int = field(metadata=hci.metadata(1))
w_esco: int = field(metadata=hci.metadata(1))
esco_packet_type_c_to_p: int = field(metadata=hci.metadata(1))
esco_packet_type_p_to_c: int = field(metadata=hci.metadata(1))
packet_length_c_to_p: int = field(metadata=hci.metadata(2))
packet_length_p_to_c: int = field(metadata=hci.metadata(2))
air_mode: int = field(metadata=hci.metadata(1))
negotiation_state: int = field(metadata=hci.metadata(1))
@Packet.subclass
@dataclass
class LmpHostConnectionReq(Packet):
opcode = Opcode.LMP_HOST_CONNECTION_REQ
@Packet.subclass
@dataclass
class LmpRemoveEscoLinkReq(Packet):
opcode = Opcode.LMP_REMOVE_ESCO_LINK_REQ
esco_handle: int = field(metadata=hci.metadata(1))
error_code: int = field(metadata=hci.metadata(1))
@Packet.subclass
@dataclass
class LmpRemoveScoLinkReq(Packet):
opcode = Opcode.LMP_REMOVE_SCO_LINK_REQ
sco_handle: int = field(metadata=hci.metadata(1))
error_code: int = field(metadata=hci.metadata(1))
@Packet.subclass
@dataclass
class LmpScoLinkReq(Packet):
opcode = Opcode.LMP_SCO_LINK_REQ
sco_handle: int = field(metadata=hci.metadata(1))
timing_control_flags: int = field(metadata=hci.metadata(1))
d_sco: int = field(metadata=hci.metadata(1))
t_sco: int = field(metadata=hci.metadata(1))
sco_packet: int = field(metadata=hci.metadata(1))
air_mode: int = field(metadata=hci.metadata(1))
@Packet.subclass
@dataclass
class LmpSwitchReq(Packet):
opcode = Opcode.LMP_SWITCH_REQ
switch_instant: int = field(metadata=hci.metadata(4), default=0)
@Packet.subclass
@dataclass
class LmpNameReq(Packet):
opcode = Opcode.LMP_NAME_REQ
name_offset: int = field(metadata=hci.metadata(2))
@Packet.subclass
@dataclass
class LmpNameRes(Packet):
opcode = Opcode.LMP_NAME_RES
name_offset: int = field(metadata=hci.metadata(2))
name_length: int = field(metadata=hci.metadata(3))
name_fregment: bytes = field(metadata=hci.metadata('*'))
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