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L2CAP: FCS Implementation

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This commit is contained in:
Josh Wu
2025-09-26 21:59:56 +08:00
parent 57e05781ad
commit 456cb59b48
6 changed files with 335 additions and 170 deletions
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29
bumble/host.py
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@@ -707,7 +707,7 @@ class Host(utils.EventEmitter):
asyncio.create_task(send_command(command))
def send_l2cap_pdu(self, connection_handle: int, cid: int, pdu: bytes) -> None:
def send_acl_sdu(self, connection_handle: int, sdu: bytes) -> None:
if not (connection := self.connections.get(connection_handle)):
logger.warning(f'connection 0x{connection_handle:04X} not found')
return
@@ -718,27 +718,24 @@ class Host(utils.EventEmitter):
)
return
# Create a PDU
l2cap_pdu = bytes(L2CAP_PDU(cid, pdu))
# Send the data to the controller via ACL packets
bytes_remaining = len(l2cap_pdu)
offset = 0
pb_flag = 0
while bytes_remaining:
data_total_length = min(bytes_remaining, packet_queue.max_packet_size)
max_packet_size = packet_queue.max_packet_size
for offset in range(0, len(sdu), max_packet_size):
pdu = sdu[offset : offset + max_packet_size]
acl_packet = hci.HCI_AclDataPacket(
connection_handle=connection_handle,
pb_flag=pb_flag,
pb_flag=1 if offset > 0 else 0,
bc_flag=0,
data_total_length=data_total_length,
data=l2cap_pdu[offset : offset + data_total_length],
data_total_length=len(pdu),
data=pdu,
)
logger.debug(
'>>> ACL packet enqueue: (Handle=0x%04X) %s', connection_handle, pdu
)
logger.debug(f'>>> ACL packet enqueue: (CID={cid}) {acl_packet}')
packet_queue.enqueue(acl_packet, connection_handle)
pb_flag = 1
offset += data_total_length
bytes_remaining -= data_total_length
def send_l2cap_pdu(self, connection_handle: int, cid: int, pdu: bytes) -> None:
self.send_acl_sdu(connection_handle, bytes(L2CAP_PDU(cid, pdu)))
def get_data_packet_queue(self, connection_handle: int) -> DataPacketQueue | None:
if connection := self.connections.get(connection_handle):