Add L2CAP credit based packets definitions

bumble/l2cap.py

@@ -23,6 +23,7 @@ import logging
 import struct
 
 from collections import deque
+from collections.abc import Sequence
 from typing import (
     Optional,
     Callable,
@@ -112,6 +113,10 @@ class CommandCode(hci.SpecableEnum):
     L2CAP_LE_CREDIT_BASED_CONNECTION_REQUEST   = 0x14
     L2CAP_LE_CREDIT_BASED_CONNECTION_RESPONSE  = 0x15
     L2CAP_LE_FLOW_CONTROL_CREDIT               = 0x16
+    L2CAP_CREDIT_BASED_CONNECTION_REQUEST      = 0x17
+    L2CAP_CREDIT_BASED_CONNECTION_RESPONSE     = 0x18
+    L2CAP_CREDIT_BASED_RECONFIGURE_REQUEST     = 0x19
+    L2CAP_CREDIT_BASED_RECONFIGURE_RESPONSE    = 0x1A
 
 L2CAP_CONNECTION_PARAMETERS_ACCEPTED_RESULT = 0x0000
 L2CAP_CONNECTION_PARAMETERS_REJECTED_RESULT = 0x0001
@@ -595,6 +600,109 @@ class L2CAP_LE_Flow_Control_Credit(L2CAP_Control_Frame):
     credits: int = dataclasses.field(metadata=hci.metadata(2))
 
 
+# -----------------------------------------------------------------------------
+@L2CAP_Control_Frame.subclass
+@dataclasses.dataclass
+class L2CAP_Credit_Based_Connection_Request(L2CAP_Control_Frame):
+    '''
+    See Bluetooth spec @ Vol 3, Part A - 4.25 L2CAP_CREDIT_BASED_CONNECTION_REQ (0x17).
+    '''
+
+    @classmethod
+    def parse_cid_list(cls, data: bytes, offset: int) -> tuple[int, list[int]]:
+        count = (len(data) - offset) // 2
+        return len(data), list(struct.unpack_from("<" + ("H" * count), data, offset))
+
+    @classmethod
+    def serialize_cid_list(cls, cids: Sequence[int]) -> bytes:
+        return b"".join([struct.pack("<H", cid) for cid in cids])
+
+    CID_METADATA: ClassVar[dict[str, Any]] = hci.metadata(
+        {
+            'parser': lambda data, offset: L2CAP_Credit_Based_Connection_Request.parse_cid_list(
+                data, offset
+            ),
+            'serializer': lambda value: L2CAP_Credit_Based_Connection_Request.serialize_cid_list(
+                value
+            ),
+        }
+    )
+
+    spsm: int = dataclasses.field(metadata=hci.metadata(2))
+    mtu: int = dataclasses.field(metadata=hci.metadata(2))
+    mps: int = dataclasses.field(metadata=hci.metadata(2))
+    initial_credits: int = dataclasses.field(metadata=hci.metadata(2))
+    source_cid: Sequence[int] = dataclasses.field(metadata=CID_METADATA)
+
+
+# -----------------------------------------------------------------------------
+@L2CAP_Control_Frame.subclass
+@dataclasses.dataclass
+class L2CAP_Credit_Based_Connection_Response(L2CAP_Control_Frame):
+    '''
+    See Bluetooth spec @ Vol 3, Part A - 4.26 L2CAP_CREDIT_BASED_CONNECTION_RSP (0x18).
+    '''
+
+    class Result(hci.SpecableEnum):
+        ALL_CONNECTIONS_SUCCESSFUL = 0x0000
+        ALL_CONNECTIONS_REFUSED_SPSM_NOT_SUPPORTED = 0x0002
+        SOME_CONNECTIONS_REFUSED_INSUFFICIENT_RESOURCES_AVAILABLE = 0x0004
+        ALL_CONNECTIONS_REFUSED_INSUFFICIENT_AUTHENTICATION = 0x0005
+        ALL_CONNECTIONS_REFUSED_INSUFFICIENT_AUTHORIZATION = 0x0006
+        ALL_CONNECTIONS_REFUSED_ENCRYPTION_KEY_SIZE_TOO_SHORT = 0x0007
+        ALL_CONNECTIONS_REFUSED_INSUFFICIENT_ENCRYPTION = 0x0008
+        SOME_CONNECTIONS_REFUSED_INVALID_SOURCE_CID = 0x0009
+        SOME_CONNECTIONS_REFUSED_SOURCE_CID_ALREADY_ALLOCATED = 0x000A
+        ALL_CONNECTIONS_REFUSED_UNACCEPTABLE_PARAMETERS = 0x000B
+        ALL_CONNECTIONS_REFUSED_INVALID_PARAMETERS = 0x000C
+        ALL_CONNECTIONS_PENDING_NO_FURTHER_INFORMATION_AVAILABLE = 0x000D
+        ALL_CONNECTIONS_PENDING_AUTHENTICATION_PENDING = 0x000E
+        ALL_CONNECTIONS_PENDING_AUTHORIZATION_PENDING = 0x000F
+
+    mtu: int = dataclasses.field(metadata=hci.metadata(2))
+    mps: int = dataclasses.field(metadata=hci.metadata(2))
+    initial_credits: int = dataclasses.field(metadata=hci.metadata(2))
+    result: int = dataclasses.field(metadata=Result.type_metadata(2))
+    destination_cid: Sequence[int] = dataclasses.field(
+        metadata=L2CAP_Credit_Based_Connection_Request.CID_METADATA
+    )
+
+
+# -----------------------------------------------------------------------------
+@L2CAP_Control_Frame.subclass
+@dataclasses.dataclass
+class L2CAP_Credit_Based_Reconfigure_Request(L2CAP_Control_Frame):
+    '''
+    See Bluetooth spec @ Vol 3, Part A - 4.27 L2CAP_CREDIT_BASED_RECONFIGURE_REQ (0x19).
+    '''
+
+    mtu: int = dataclasses.field(metadata=hci.metadata(2))
+    mps: int = dataclasses.field(metadata=hci.metadata(2))
+    destination_cid: Sequence[int] = dataclasses.field(
+        metadata=L2CAP_Credit_Based_Connection_Request.CID_METADATA
+    )
+
+
+# -----------------------------------------------------------------------------
+@L2CAP_Control_Frame.subclass
+@dataclasses.dataclass
+class L2CAP_Credit_Based_Reconfigure_Response(L2CAP_Control_Frame):
+    '''
+    See Bluetooth spec @ Vol 3, Part A - 4.28 L2CAP_CREDIT_BASED_RECONFIGURE_RSP (0x1A).
+    '''
+
+    class Result(hci.SpecableEnum):
+        RECONFIGURATION_SUCCESSFUL = 0x0000
+        RECONFIGURATION_FAILED_REDUCTION_IN_SIZE_OF_MTU_NOT_ALLOWED = 0x0001
+        RECONFIGURATION_FAILED_REDUCTION_IN_SIZE_OF_MPS_NOT_ALLOWED_FOR_MORE_THAN_ONE_CHANNEL_AT_A_TIME = (
+            0x0002
+        )
+        RECONFIGURATION_FAILED_ONE_OR_MORE_DESTINATION_CIDS_INVALID = 0x0003
+        RECONFIGURATION_FAILED_OTHER_UNACCEPTABLE_PARAMETERS = 0x0004
+
+    result: int = dataclasses.field(metadata=Result.type_metadata(2))
+
+
 # -----------------------------------------------------------------------------
 class ClassicChannel(utils.EventEmitter):
     class State(enum.IntEnum):