# Bluetooth ATT/GATT configuration options

# Copyright (c) 2019 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

menu "ATT and GATT Options"

config BT_ATT_ENFORCE_FLOW
	bool "Enforce strict flow control semantics for incoming PDUs"
	default y if !(BOARD_QEMU_CORTEX_M3 || BOARD_QEMU_X86 || ARCH_POSIX)
	help
	  Enforce flow control rules on incoming PDUs, preventing a peer
	  from sending new requests until a previous one has been responded
	  or sending a new indication until a previous one has been
	  confirmed. This may need to be disabled to avoid potential race
	  conditions arising from a USB based HCI transport that splits
	  HCI events and ACL data to separate endpoints.

config BT_ATT_PREPARE_COUNT
	int "Number of ATT prepare write buffers"
	default 0
	range 0 64
	help
	  Number of buffers available for ATT prepare write, setting
	  this to 0 disables GATT long/reliable writes.

config BT_ATT_TX_MAX
	int "Maximum number of queued outgoing ATT PDUs"
	default 2
	range 1 BT_L2CAP_TX_BUF_COUNT
	help
	  Number of ATT PDUs that can be at a single moment queued for
	  transmission. If the application tries to send more than this
	  amount the calls will block until an existing queued PDU gets
	  sent.

config BT_GATT_SERVICE_CHANGED
	bool "GATT Service Changed support"
	default y
	help
	  This option enables support for the service changed characteristic.

config BT_GATT_DYNAMIC_DB
	bool "GATT dynamic database support"
	default n
	depends on BT_GATT_SERVICE_CHANGED
	help
	  This option enables registering/unregistering services at runtime.

config BT_GATT_CACHING
	bool "GATT Caching support"
	default y
	depends on BT_GATT_SERVICE_CHANGED
	select TINYCRYPT
	select TINYCRYPT_AES
	select TINYCRYPT_AES_CMAC
	help
	  This option enables support for GATT Caching. When enabled the stack
	  will register Client Supported Features and Database Hash
	  characteristics which can be used by clients to detect if anything has
	  changed on the GATT database.

config BT_GATT_ENFORCE_CHANGE_UNAWARE
	bool "GATT Enforce change-unaware state"
	depends on BT_GATT_CACHING
	help
	  When enable this option blocks notification and indications to client
	  to conform to the following statement from the Bluetooth 5.1
	  specification:
	  '...the server shall not send notifications and indications to such
	  a client until it becomes change-aware."
	  In case the service cannot deal with sudden errors (-EAGAIN) then it
	  shall not use this option.

config BT_GATT_CLIENT
	bool "GATT client support"
	help
	  This option enables support for the GATT Client role.

config BT_GATT_READ_MULTIPLE
	bool "GATT Read Multiple Characteristic Values support"
	default y
	help
	  This option enables support for the GATT Read Multiple Characteristic
	  Values procedure.

config BT_GAP_PERIPHERAL_PREF_PARAMS
	bool "Configure peripheral preferred connection parameters"
	default y
	depends on BT_PERIPHERAL
	help
	  This allows to configure peripheral preferred connection parameters.
	  Enabling this option results in adding PPCP characteristic in GAP
	  and sending request for connection parameters update after GAP
	  recommended 5 seconds of connection as peripheral. If disabled it is
	  up to application to set expected connection parameters.

if BT_GAP_PERIPHERAL_PREF_PARAMS
config BT_PERIPHERAL_PREF_MIN_INT
	int "Peripheral preferred minimum connection interval in 1.25ms units"
	default 24
	range 6 65535
	help
	  Range 3200 to 65534 is invalid. 65535 represents no specific value.

config BT_PERIPHERAL_PREF_MAX_INT
	int "Peripheral preferred maximum connection interval in 1.25ms units"
	default 40
	range 6 65535
	help
	  Range 3200 to 65534 is invalid. 65535 represents no specific value.

config BT_PERIPHERAL_PREF_SLAVE_LATENCY
	int "Peripheral preferred slave latency in Connection Intervals"
	default 0
	range 0 499

config BT_PERIPHERAL_PREF_TIMEOUT
	int "Peripheral preferred supervision timeout in 10ms units"
	default 42
	range 10 65535
	help
	  It is up to user to provide valid timeout which pass required minimum
	  value: in milliseconds it shall be larger than
	  "(1+ Conn_Latency) * Conn_Interval_Max * 2"
	  where Conn_Interval_Max is given in milliseconds.
	  Range 3200 to 65534 is invalid. 65535 represents no specific value.
endif # BT_GAP_PERIPHERAL_PREF_PARAMS

config BT_DEVICE_NAME_GATT_WRITABLE
	bool "Allow to write name by remote GATT clients"
	depends on BT_DEVICE_NAME_DYNAMIC
	default y
	help
	  Enabling this option allows remote GATT clients to write to device
	  name GAP characteristic.

if BT_DEBUG

config BT_DEBUG_ATT
	bool "Bluetooth Attribute Protocol (ATT) debug"
	help
	  This option enables debug support for the Bluetooth
	  Attribute Protocol (ATT).

config BT_DEBUG_GATT
	bool "Bluetooth Generic Attribute Profile (GATT) debug"
	help
	  This option enables debug support for the Bluetooth
	  Generic Attribute Profile (GATT).

endif # BT_DEBUG

endmenu