l2cap.h File Reference

#include "hci.h"
#include "l2cap_signaling.h"
#include "btstack_util.h"
#include "bluetooth.h"

Data Structures
struct	l2cap_channel_t
struct	l2cap_ertm_config_t
struct	l2cap_ertm_rx_packet_state_t
struct	l2cap_ertm_tx_packet_state_t
struct	l2cap_service_t
struct	l2cap_signaling_response

Macros
#define	L2CAP_LE_AUTOMATIC_CREDITS   0xffff

Typedefs
typedef struct l2cap_signaling_response	l2cap_signaling_response_t

Enumerations
enum	L2CAP_CHANNEL_STATE_VAR {   L2CAP_CHANNEL_STATE_VAR_NONE = 0,   L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ = 1 << 0,   L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP = 1 << 1,   L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ = 1 << 2,   L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP = 1 << 3,   L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ = 1 << 4,   L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP = 1 << 5,   L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU = 1 << 6,   L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT = 1 << 7,   L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID = 1 << 8,   L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_REJECTED = 1 << 9,   L2CAP_CHANNEL_STATE_VAR_BASIC_FALLBACK_TRIED = 1 << 10,   L2CAP_CHANNEL_STATE_VAR_SEND_CMD_REJ_UNKNOWN = 1 << 11,   L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND = 1 << 12,   L2CAP_CHANNEL_STATE_VAR_INCOMING = 1 << 15 }
enum	L2CAP_STATE {   L2CAP_STATE_CLOSED = 1,   L2CAP_STATE_WILL_SEND_CREATE_CONNECTION,   L2CAP_STATE_WAIT_CONNECTION_COMPLETE,   L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES,   L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE,   L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE,   L2CAP_STATE_WAIT_INCOMING_EXTENDED_FEATURES,   L2CAP_STATE_WAIT_OUTGOING_EXTENDED_FEATURES,   L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT,   L2CAP_STATE_WAIT_CONNECT_RSP,   L2CAP_STATE_CONFIG,   L2CAP_STATE_OPEN,   L2CAP_STATE_WAIT_DISCONNECT,   L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST,   L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_INSUFFICIENT_SECURITY,   L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE,   L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT,   L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST,   L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE,   L2CAP_STATE_WILL_SEND_LE_CONNECTION_REQUEST,   L2CAP_STATE_WILL_SEND_LE_CONNECTION_RESPONSE_DECLINE,   L2CAP_STATE_WILL_SEND_LE_CONNECTION_RESPONSE_ACCEPT,   L2CAP_STATE_WAIT_LE_CONNECTION_RESPONSE,   L2CAP_STATE_INVALID }

Functions
void	l2cap_accept_connection (uint16_t local_cid)
	Accepts incoming L2CAP connection. More...
uint8_t	l2cap_accept_ertm_connection (uint16_t local_cid, l2cap_ertm_config_t *ertm_contig, uint8_t *buffer, uint32_t size)
	Accepts incoming L2CAP connection for Enhanced Retransmission Mode. More...
int	l2cap_can_send_fixed_channel_packet_now (hci_con_handle_t con_handle, uint16_t channel_id)
int	l2cap_can_send_packet_now (uint16_t local_cid)
	Check if outgoing buffer is available and that there's space on the Bluetooth module. More...
int	l2cap_can_send_prepared_packet_now (uint16_t local_cid)
uint8_t	l2cap_create_channel (btstack_packet_handler_t packet_handler, bd_addr_t address, uint16_t psm, uint16_t mtu, uint16_t *out_local_cid)
	Creates L2CAP channel to the PSM of a remote device with baseband address. More...
uint8_t	l2cap_create_ertm_channel (btstack_packet_handler_t packet_handler, bd_addr_t address, uint16_t psm, l2cap_ertm_config_t *ertm_contig, uint8_t *buffer, uint32_t size, uint16_t *out_local_cid)
	Creates L2CAP channel to the PSM of a remote device with baseband address using Enhanced Retransmission Mode. More...
void	l2cap_decline_connection (uint16_t local_cid)
	Deny incoming L2CAP connection. More...
void	l2cap_disconnect (uint16_t local_cid, uint8_t reason)
	Disconnects L2CAP channel with given identifier. More...
uint8_t	l2cap_ertm_set_busy (uint16_t local_cid)
	ERTM Set channel as busy. More...
uint8_t	l2cap_ertm_set_ready (uint16_t local_cid)
	ERTM Set channel as ready. More...
uint8_t *	l2cap_get_outgoing_buffer (void)
	Get outgoing buffer and prepare data. More...
uint16_t	l2cap_get_remote_mtu_for_local_cid (uint16_t local_cid)
	Queries the maximal transfer unit (MTU) for L2CAP channel with given identifier. More...
void	l2cap_init (void)
	Set up L2CAP and register L2CAP with HCI layer. More...
uint8_t	l2cap_le_accept_connection (uint16_t local_cid, uint8_t *receive_sdu_buffer, uint16_t mtu, uint16_t initial_credits)
int	l2cap_le_can_send_now (uint16_t cid)
	Check if packet can be scheduled for transmission. More...
uint8_t	l2cap_le_create_channel (btstack_packet_handler_t packet_handler, hci_con_handle_t con_handle, uint16_t psm, uint8_t *receive_sdu_buffer, uint16_t mtu, uint16_t initial_credits, gap_security_level_t security_level, uint16_t *out_local_cid)
	Create LE Data Channel. More...
uint8_t	l2cap_le_decline_connection (uint16_t local_cid)
	Deny incoming LE Data Channel connection due to resource constraints. More...
uint8_t	l2cap_le_disconnect (uint16_t cid)
	Disconnect from LE Data Channel. More...
uint8_t	l2cap_le_provide_credits (uint16_t cid, uint16_t credits)
	Provide credtis for LE Data Channel. More...
uint8_t	l2cap_le_register_service (btstack_packet_handler_t packet_handler, uint16_t psm, gap_security_level_t security_level)
	Register L2CAP LE Data Channel service. More...
uint8_t	l2cap_le_request_can_send_now_event (uint16_t cid)
	Request emission of L2CAP_EVENT_LE_CAN_SEND_NOW as soon as possible. More...
uint8_t	l2cap_le_send_data (uint16_t cid, uint8_t *data, uint16_t size)
	Send data via LE Data Channel. More...
uint8_t	l2cap_le_unregister_service (uint16_t psm)
	Unregister L2CAP LE Data Channel service. More...
uint16_t	l2cap_max_le_mtu (void)
	Get max MTU for LE connections based on btstack configuration. More...
uint16_t	l2cap_max_mtu (void)
	Get max MTU for Classic connections based on btstack configuration. More...
void	l2cap_register_fixed_channel (btstack_packet_handler_t packet_handler, uint16_t channel_id)
void	l2cap_register_packet_handler (void(*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size))
	Registers packet handler for LE Connection Parameter Update events. More...
uint8_t	l2cap_register_service (btstack_packet_handler_t packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level)
	Registers L2CAP service with given PSM and MTU, and assigns a packet handler. More...
void	l2cap_release_packet_buffer (void)
	Release outgoing buffer (only needed if l2cap_send_prepared is not called) More...
void	l2cap_request_can_send_fix_channel_now_event (hci_con_handle_t con_handle, uint16_t channel_id)
void	l2cap_request_can_send_now_event (uint16_t local_cid)
	Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible. More...
void	l2cap_require_security_level_2_for_outgoing_sdp (void)
int	l2cap_reserve_packet_buffer (void)
	Reserve outgoing buffer. More...
int	l2cap_send (uint16_t local_cid, uint8_t *data, uint16_t len)
	Sends L2CAP data packet to the channel with given identifier. More...
int	l2cap_send_connectionless (hci_con_handle_t con_handle, uint16_t cid, uint8_t *data, uint16_t len)
int	l2cap_send_echo_request (hci_con_handle_t con_handle, uint8_t *data, uint16_t len)
int	l2cap_send_prepared (uint16_t local_cid, uint16_t len)
	Send L2CAP packet prepared in outgoing buffer to channel. More...
int	l2cap_send_prepared_connectionless (hci_con_handle_t con_handle, uint16_t cid, uint16_t len)
uint8_t	l2cap_unregister_service (uint16_t psm)
	Unregisters L2CAP service with given PSM. More...

#define L2CAP_LE_AUTOMATIC_CREDITS   0xffff

typedef struct l2cap_signaling_response l2cap_signaling_response_t

enum L2CAP_CHANNEL_STATE_VAR

Enumerator
L2CAP_CHANNEL_STATE_VAR_NONE
L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ
L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP
L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ
L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP
L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ
L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP
L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU
L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT
L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID
L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_REJECTED
L2CAP_CHANNEL_STATE_VAR_BASIC_FALLBACK_TRIED
L2CAP_CHANNEL_STATE_VAR_SEND_CMD_REJ_UNKNOWN
L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND
L2CAP_CHANNEL_STATE_VAR_INCOMING

enum L2CAP_STATE

Enumerator
L2CAP_STATE_CLOSED
L2CAP_STATE_WILL_SEND_CREATE_CONNECTION
L2CAP_STATE_WAIT_CONNECTION_COMPLETE
L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES
L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE
L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE
L2CAP_STATE_WAIT_INCOMING_EXTENDED_FEATURES
L2CAP_STATE_WAIT_OUTGOING_EXTENDED_FEATURES
L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT
L2CAP_STATE_WAIT_CONNECT_RSP
L2CAP_STATE_CONFIG
L2CAP_STATE_OPEN
L2CAP_STATE_WAIT_DISCONNECT
L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST
L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_INSUFFICIENT_SECURITY
L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE
L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT
L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST
L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE
L2CAP_STATE_WILL_SEND_LE_CONNECTION_REQUEST
L2CAP_STATE_WILL_SEND_LE_CONNECTION_RESPONSE_DECLINE
L2CAP_STATE_WILL_SEND_LE_CONNECTION_RESPONSE_ACCEPT
L2CAP_STATE_WAIT_LE_CONNECTION_RESPONSE
L2CAP_STATE_INVALID

void l2cap_accept_connection

(

uint16_t

local_cid

)

Accepts incoming L2CAP connection.

uint8_t l2cap_accept_ertm_connection	(	uint16_t	local_cid,
		l2cap_ertm_config_t *	ertm_contig,
		uint8_t *	buffer,
		uint32_t	size
	)

Accepts incoming L2CAP connection for Enhanced Retransmission Mode.

Parameters

local_cid
ertm_config
buffer	to store reassembled rx packet, out-of-order packets and unacknowledged outgoing packets with their tretransmission timers
size	of buffer

Returns

status

int l2cap_can_send_fixed_channel_packet_now	(	hci_con_handle_t	con_handle,
		uint16_t	channel_id
	)

References hci_can_send_acl_packet_now(), and UNUSED.

Referenced by att_dispatch_client_can_send_now(), att_dispatch_server_can_send_now(), and sm_run().

int l2cap_can_send_packet_now

(

uint16_t

local_cid

)

Check if outgoing buffer is available and that there's space on the Bluetooth module.

int l2cap_can_send_prepared_packet_now

(

uint16_t

local_cid

)

uint8_t l2cap_create_channel	(	btstack_packet_handler_t	packet_handler,
		bd_addr_t	address,
		uint16_t	psm,
		uint16_t	mtu,
		uint16_t *	out_local_cid
	)

Creates L2CAP channel to the PSM of a remote device with baseband address.

A new baseband connection will be initiated if necessary.

Parameters

packet_handler
address
psm
mtu
local_cid

Returns

status

uint8_t l2cap_create_ertm_channel	(	btstack_packet_handler_t	packet_handler,
		bd_addr_t	address,
		uint16_t	psm,
		l2cap_ertm_config_t *	ertm_contig,
		uint8_t *	buffer,
		uint32_t	size,
		uint16_t *	out_local_cid
	)

Creates L2CAP channel to the PSM of a remote device with baseband address using Enhanced Retransmission Mode.

   A new baseband connection will be initiated if necessary.

Parameters

packet_handler
address
psm
ertm_config
buffer	to store reassembled rx packet, out-of-order packets and unacknowledged outgoing packets with their tretransmission timers
size	of buffer
local_cid

Returns

status

void l2cap_decline_connection

(

uint16_t

local_cid

)

Deny incoming L2CAP connection.

void l2cap_disconnect	(	uint16_t	local_cid,
		uint8_t	reason
	)

Disconnects L2CAP channel with given identifier.

uint8_t l2cap_ertm_set_busy

(

uint16_t

local_cid

)

ERTM Set channel as busy.

Note

Can be cleared by l2cap_ertm_set_ready

Parameters

local_cid

uint8_t l2cap_ertm_set_ready

(

uint16_t

local_cid

)

ERTM Set channel as ready.

Note

Used after l2cap_ertm_set_busy

Parameters

local_cid

uint8_t* l2cap_get_outgoing_buffer

(

void

)

Get outgoing buffer and prepare data.

References COMPLETE_L2CAP_HEADER, and hci_get_outgoing_packet_buffer().

Referenced by att_confirmation(), att_exchange_mtu_request(), att_execute_write_request(), att_find_by_type_value_request(), att_find_information_request(), att_prepare_write_request(), att_read_blob_request(), att_read_by_type_or_group_request_for_uuid128(), att_read_by_type_or_group_request_for_uuid16(), att_read_multiple_request(), att_read_request(), att_server_indicate(), att_server_notify(), att_server_process_validated_request(), and att_write_request().

uint16_t l2cap_get_remote_mtu_for_local_cid

(

uint16_t

local_cid

)

Queries the maximal transfer unit (MTU) for L2CAP channel with given identifier.

void l2cap_init

(

void

)

Set up L2CAP and register L2CAP with HCI layer.

References btstack_packet_callback_registration_t::callback, gap_connectable_control(), hci_add_event_handler(), hci_register_acl_packet_handler(), l2cap_acl_handler(), l2cap_hci_event_handler(), NULL, and signaling_responses_pending.

Referenced by le_counter_setup(), le_prov_app_setup(), and tss_app_setup().

uint8_t l2cap_le_accept_connection	(	uint16_t	local_cid,
		uint8_t *	receive_sdu_buffer,
		uint16_t	mtu,
		uint16_t	initial_credits
	)

int l2cap_le_can_send_now

(

uint16_t

cid

)

Check if packet can be scheduled for transmission.

Parameters

local_cid

L2CAP LE Data Channel Identifier

uint8_t l2cap_le_create_channel	(	btstack_packet_handler_t	packet_handler,
		hci_con_handle_t	con_handle,
		uint16_t	psm,
		uint8_t *	receive_sdu_buffer,
		uint16_t	mtu,
		uint16_t	initial_credits,
		gap_security_level_t	security_level,
		uint16_t *	out_local_cid
	)

Create LE Data Channel.

Parameters

packet_handler	Packet handler for this connection
con_handle	ACL-LE HCI Connction Handle
psm	Service PSM to connect to
receive_buffer	buffer used for reassembly of L2CAP LE Information Frames into service data unit (SDU) with given MTU
receive_buffer_size	buffer size equals MTU
initial_credits	Number of initial credits provided to peer or L2CAP_LE_AUTOMATIC_CREDITS to enable automatic credits
security_level	Minimum required security level
out_local_cid	L2CAP LE Channel Identifier is stored here

uint8_t l2cap_le_decline_connection

(

uint16_t

local_cid

)

Deny incoming LE Data Channel connection due to resource constraints.

Parameters

local_cid

L2CAP LE Data Channel Identifier

uint8_t l2cap_le_disconnect

(

uint16_t

cid

)

Disconnect from LE Data Channel.

Parameters

local_cid

L2CAP LE Data Channel Identifier

uint8_t l2cap_le_provide_credits	(	uint16_t	cid,
		uint16_t	credits
	)

Provide credtis for LE Data Channel.

Parameters

local_cid	L2CAP LE Data Channel Identifier
credits	Number additional credits for peer

uint8_t l2cap_le_register_service	(	btstack_packet_handler_t	packet_handler,
		uint16_t	psm,
		gap_security_level_t	security_level
	)

Register L2CAP LE Data Channel service.

Note

MTU and initial credits are specified in l2cap_le_accept_connection(..) call

Parameters

packet_handler
psm
security_level

uint8_t l2cap_le_request_can_send_now_event

(

uint16_t

cid

)

Request emission of L2CAP_EVENT_LE_CAN_SEND_NOW as soon as possible.

Note

L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function so packet handler should be ready to handle it

Parameters

local_cid

L2CAP LE Data Channel Identifier

uint8_t l2cap_le_send_data	(	uint16_t	cid,
		uint8_t *	data,
		uint16_t	size
	)

Send data via LE Data Channel.

Note

Since data larger then the maximum PDU needs to be segmented into multiple PDUs, data needs to stay valid until ... event

Parameters

local_cid	L2CAP LE Data Channel Identifier
data	data to send
size	data size

uint8_t l2cap_le_unregister_service

(

uint16_t

psm

)

Unregister L2CAP LE Data Channel service.

Parameters

psm

uint16_t l2cap_max_le_mtu

(

void

)

Get max MTU for LE connections based on btstack configuration.

References l2cap_max_mtu().

Referenced by att_event_packet_handler(), att_exchange_mtu_request(), gatt_client_att_packet_handler(), and peripheral_mtu().

uint16_t l2cap_max_mtu

(

void

)

Get max MTU for Classic connections based on btstack configuration.

References L2CAP_HEADER_SIZE.

Referenced by l2cap_max_le_mtu().

void l2cap_register_fixed_channel	(	btstack_packet_handler_t	packet_handler,
		uint16_t	channel_id
	)

References l2cap_fixed_channel::callback, and l2cap_fixed_channel_table_index_for_channel_id().

Referenced by att_dispatch_register_client(), att_dispatch_register_server(), and sm_init().

void l2cap_register_packet_handler

(

void(*)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)

handler

)

Registers packet handler for LE Connection Parameter Update events.

References UNUSED.

uint8_t l2cap_register_service	(	btstack_packet_handler_t	packet_handler,
		uint16_t	psm,
		uint16_t	mtu,
		gap_security_level_t	security_level
	)

Registers L2CAP service with given PSM and MTU, and assigns a packet handler.

void l2cap_release_packet_buffer

(

void

)

Release outgoing buffer (only needed if l2cap_send_prepared is not called)

References hci_release_packet_buffer().

Referenced by att_server_process_validated_request().

void l2cap_request_can_send_fix_channel_now_event	(	hci_con_handle_t	con_handle,
		uint16_t	channel_id
	)

References l2cap_fixed_channel_table_index_for_channel_id(), l2cap_notify_channel_can_send(), UNUSED, and l2cap_fixed_channel::waiting_for_can_send_now.

Referenced by att_dispatch_client_request_can_send_now_event(), att_dispatch_server_request_can_send_now_event(), and sm_run().

void l2cap_request_can_send_now_event

(

uint16_t

local_cid

)

Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible.

Note

L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function so packet handler should be ready to handle it

Parameters

local_cid

void l2cap_require_security_level_2_for_outgoing_sdp

(

void

)

int l2cap_reserve_packet_buffer

(

void

)

Reserve outgoing buffer.

References hci_reserve_packet_buffer().

Referenced by att_confirmation(), att_exchange_mtu_request(), att_execute_write_request(), att_find_by_type_value_request(), att_find_information_request(), att_prepare_write_request(), att_read_blob_request(), att_read_by_type_or_group_request_for_uuid128(), att_read_by_type_or_group_request_for_uuid16(), att_read_multiple_request(), att_read_request(), att_server_indicate(), att_server_notify(), att_server_process_validated_request(), and att_write_request().

int l2cap_send	(	uint16_t	local_cid,
		uint8_t *	data,
		uint16_t	len
	)

Sends L2CAP data packet to the channel with given identifier.

int l2cap_send_connectionless	(	hci_con_handle_t	con_handle,
		uint16_t	cid,
		uint8_t *	data,
		uint16_t	len
	)

References BTSTACK_ACL_BUFFERS_FULL, hci_can_send_acl_packet_now(), hci_get_outgoing_packet_buffer(), hci_reserve_packet_buffer(), l2cap_send_prepared_connectionless(), and log_info.

Referenced by sm_run().

int l2cap_send_echo_request	(	hci_con_handle_t	con_handle,
		uint8_t *	data,
		uint16_t	len
	)

int l2cap_send_prepared	(	uint16_t	local_cid,
		uint16_t	len
	)

Send L2CAP packet prepared in outgoing buffer to channel.

int l2cap_send_prepared_connectionless	(	hci_con_handle_t	con_handle,
		uint16_t	cid,
		uint16_t	len
	)

References BTSTACK_ACL_BUFFERS_FULL, hci_can_send_prepared_acl_packet_now(), hci_get_outgoing_packet_buffer(), hci_is_packet_buffer_reserved(), hci_send_acl_packet_buffer(), l2cap_setup_header(), log_debug, log_error, and log_info.

Referenced by att_confirmation(), att_exchange_mtu_request(), att_execute_write_request(), att_find_by_type_value_request(), att_find_information_request(), att_prepare_write_request(), att_read_blob_request(), att_read_by_type_or_group_request_for_uuid128(), att_read_by_type_or_group_request_for_uuid16(), att_read_multiple_request(), att_read_request(), att_server_indicate(), att_server_notify(), att_server_process_validated_request(), att_write_request(), and l2cap_send_connectionless().

uint8_t l2cap_unregister_service

(

uint16_t

psm

)

Unregisters L2CAP service with given PSM.