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circuitpython/extmod/btstack/modbluetooth_btstack.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/runtime.h"
#include "py/mperrno.h"
#include "py/mphal.h"
#if MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK
#include "extmod/btstack/modbluetooth_btstack.h"
#include "extmod/modbluetooth.h"
#include "lib/btstack/src/btstack.h"
#define DEBUG_printf(...) // printf("btstack: " __VA_ARGS__)
#ifndef MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME
#define MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME "MPY BTSTACK"
#endif
// How long to wait for a controller to init/deinit.
// Some controllers can take up to 5-6 seconds in normal operation.
STATIC const uint32_t BTSTACK_INIT_DEINIT_TIMEOUT_MS = 15000;
// We need to know the attribute handle for the GAP device name (see GAP_DEVICE_NAME_UUID)
// so it can be put into the gatts_db before registering the services, and accessed
// efficiently when requesting an attribute in att_read_callback. Because this is the
// first characteristic of the first service, it always has a handle value of 3.
STATIC const uint16_t BTSTACK_GAP_DEVICE_NAME_HANDLE = 3;
volatile int mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
// sm_set_authentication_requirements is set-only, so cache current value.
#if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
STATIC uint8_t mp_bluetooth_btstack_sm_auth_req = 0;
#endif
#define ERRNO_BLUETOOTH_NOT_ACTIVE MP_ENODEV
STATIC int btstack_error_to_errno(int err) {
DEBUG_printf(" --> btstack error: %d\n", err);
if (err == ERROR_CODE_SUCCESS) {
return 0;
} else if (err == BTSTACK_ACL_BUFFERS_FULL || err == BTSTACK_MEMORY_ALLOC_FAILED) {
return MP_ENOMEM;
} else if (err == GATT_CLIENT_IN_WRONG_STATE) {
return MP_EALREADY;
} else if (err == GATT_CLIENT_BUSY) {
return MP_EBUSY;
} else if (err == GATT_CLIENT_NOT_CONNECTED) {
return MP_ENOTCONN;
} else {
return MP_EINVAL;
}
}
#if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
STATIC mp_obj_bluetooth_uuid_t create_mp_uuid(uint16_t uuid16, const uint8_t *uuid128) {
mp_obj_bluetooth_uuid_t result;
result.base.type = &mp_type_bluetooth_uuid;
if (uuid16 != 0) {
result.data[0] = uuid16 & 0xff;
result.data[1] = (uuid16 >> 8) & 0xff;
result.type = MP_BLUETOOTH_UUID_TYPE_16;
} else {
reverse_128(uuid128, result.data);
result.type = MP_BLUETOOTH_UUID_TYPE_128;
}
return result;
}
#endif // MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
// Notes on supporting background ops (e.g. an attempt to gatts_notify while
// an existing notification is in progress):
// GATTS Notify/Indicate (att_server_notify/indicate)
// * When available, copies buffer immediately.
// * Otherwise fails with BTSTACK_ACL_BUFFERS_FULL
// * Use att_server_request_to_send_notification/indication to get callback
// * Takes btstack_context_callback_registration_t (and takes ownership) and conn_handle.
// * Callback is invoked with just the context member of the btstack_context_callback_registration_t
// GATTC Write without response (gatt_client_write_value_of_characteristic_without_response)
// * When available, copies buffer immediately.
// * Otherwise, fails with GATT_CLIENT_BUSY.
// * Use gatt_client_request_can_write_without_response_event to get callback
// * Takes btstack_packet_handler_t (function pointer) and conn_handle
// * Callback is invoked, use gatt_event_can_write_without_response_get_handle to get the conn_handle (no other context)
// * There can only be one pending gatt_client_request_can_write_without_response_event (otherwise we fail with EALREADY).
// GATTC Write with response (gatt_client_write_value_of_characteristic)
// * When peripheral is available, takes ownership of buffer.
// * Otherwise, fails with GATT_CLIENT_IN_WRONG_STATE (we fail the operation).
// * Raises GATT_EVENT_QUERY_COMPLETE to the supplied packet handler.
// For notify/indicate/write-without-response that proceed immediately, nothing extra required.
// For all other cases, buffer needs to be copied and protected from GC.
// For notify/indicate:
// * btstack_context_callback_registration_t:
// * needs to be malloc'ed
// * needs to be protected from GC
// * context arg needs to point back to the callback registration so it can be freed and un-protected
// For write-without-response
// * only the conn_handle is available in the callback
// * so we need a queue of conn_handle->(value_handle, copied buffer)
// Pending operation types.
enum {
// Queued for sending when possible.
MP_BLUETOOTH_BTSTACK_PENDING_NOTIFY, // Waiting for context callback
MP_BLUETOOTH_BTSTACK_PENDING_INDICATE, // Waiting for context callback
MP_BLUETOOTH_BTSTACK_PENDING_WRITE_NO_RESPONSE, // Waiting for conn handle
// Hold buffer pointer until complete.
MP_BLUETOOTH_BTSTACK_PENDING_WRITE, // Waiting for write done event
};
// Pending operation:
// - Holds a GC reference to the copied outgoing buffer.
// - Provides enough information for the callback handler to execute the desired operation.
struct _mp_btstack_pending_op_t {
btstack_linked_item_t *next; // Must be first field to match btstack_linked_item.
// See enum above.
uint16_t op_type;
// For all op types.
uint16_t conn_handle;
uint16_t value_handle;
// For notify/indicate only.
// context_registration.context will point back to this struct.
btstack_context_callback_registration_t context_registration;
// For notify/indicate/write-without-response, this is the actual buffer to send.
// For write-with-response, just holding onto the buffer for GC ref.
size_t len;
uint8_t buf[];
};
// Must hold MICROPY_PY_BLUETOOTH_ENTER.
STATIC void btstack_remove_pending_operation(mp_btstack_pending_op_t *pending_op, bool del) {
bool removed = btstack_linked_list_remove(&MP_STATE_PORT(bluetooth_btstack_root_pointers)->pending_ops, (btstack_linked_item_t *)pending_op);
assert(removed);
(void)removed;
if (del) {
m_del_var(mp_btstack_pending_op_t, uint8_t, pending_op->len, pending_op);
}
}
// Called in response to a gatts_notify/indicate being unable to complete, which then calls
// att_server_request_to_send_notification.
// We now have an opportunity to re-try the operation with an empty ACL buffer.
STATIC void btstack_notify_indicate_ready_handler(void *context) {
MICROPY_PY_BLUETOOTH_ENTER
mp_btstack_pending_op_t *pending_op = (mp_btstack_pending_op_t *)context;
DEBUG_printf("btstack_notify_indicate_ready_handler op_type=%d conn_handle=%d value_handle=%d len=%zu\n", pending_op->op_type, pending_op->conn_handle, pending_op->value_handle, pending_op->len);
if (pending_op->op_type == MP_BLUETOOTH_BTSTACK_PENDING_NOTIFY) {
int err = att_server_notify(pending_op->conn_handle, pending_op->value_handle, pending_op->buf, pending_op->len);
DEBUG_printf("btstack_notify_indicate_ready_handler: sending notification err=%d\n", err);
assert(err == ERROR_CODE_SUCCESS);
(void)err;
} else {
assert(pending_op->op_type == MP_BLUETOOTH_BTSTACK_PENDING_INDICATE);
int err = att_server_indicate(pending_op->conn_handle, pending_op->value_handle, NULL, 0);
DEBUG_printf("btstack_notify_indicate_ready_handler: sending indication err=%d\n", err);
assert(err == ERROR_CODE_SUCCESS);
(void)err;
}
// Can't free the pending op as we're in IRQ context. Leave it for the GC.
btstack_remove_pending_operation(pending_op, false /* del */);
MICROPY_PY_BLUETOOTH_EXIT
}
// Register a pending background operation -- copies the buffer, and makes it known to the GC.
STATIC mp_btstack_pending_op_t *btstack_enqueue_pending_operation(uint16_t op_type, uint16_t conn_handle, uint16_t value_handle, const uint8_t *buf, size_t len) {
DEBUG_printf("btstack_enqueue_pending_operation op_type=%d conn_handle=%d value_handle=%d len=%zu\n", op_type, conn_handle, value_handle, len);
mp_btstack_pending_op_t *pending_op = m_new_obj_var(mp_btstack_pending_op_t, uint8_t, len);
pending_op->op_type = op_type;
pending_op->conn_handle = conn_handle;
pending_op->value_handle = value_handle;
pending_op->len = len;
memcpy(pending_op->buf, buf, len);
if (op_type == MP_BLUETOOTH_BTSTACK_PENDING_NOTIFY || op_type == MP_BLUETOOTH_BTSTACK_PENDING_INDICATE) {
pending_op->context_registration.callback = &btstack_notify_indicate_ready_handler;
pending_op->context_registration.context = pending_op;
}
MICROPY_PY_BLUETOOTH_ENTER
bool added = btstack_linked_list_add(&MP_STATE_PORT(bluetooth_btstack_root_pointers)->pending_ops, (btstack_linked_item_t *)pending_op);
assert(added);
(void)added;
MICROPY_PY_BLUETOOTH_EXIT
return pending_op;
}
#if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
// Cleans up a pending op of the specified type for this conn_handle (and if specified, value_handle).
// Used by MP_BLUETOOTH_BTSTACK_PENDING_WRITE and MP_BLUETOOTH_BTSTACK_PENDING_WRITE_NO_RESPONSE.
// At the moment, both will set value_handle=0xffff as the events do not know their value_handle.
// TODO: Can we make btstack give us the value_handle for regular write (with response) so that we
// know for sure that we're using the correct entry.
STATIC mp_btstack_pending_op_t *btstack_finish_pending_operation(uint16_t op_type, uint16_t conn_handle, uint16_t value_handle, bool del) {
MICROPY_PY_BLUETOOTH_ENTER
DEBUG_printf("btstack_finish_pending_operation op_type=%d conn_handle=%d value_handle=%d\n", op_type, conn_handle, value_handle);
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, &MP_STATE_PORT(bluetooth_btstack_root_pointers)->pending_ops);
while (btstack_linked_list_iterator_has_next(&it)) {
mp_btstack_pending_op_t *pending_op = (mp_btstack_pending_op_t *)btstack_linked_list_iterator_next(&it);
if (pending_op->op_type == op_type && pending_op->conn_handle == conn_handle && (value_handle == 0xffff || pending_op->value_handle == value_handle)) {
DEBUG_printf("btstack_finish_pending_operation: found value_handle=%d len=%zu\n", pending_op->value_handle, pending_op->len);
btstack_remove_pending_operation(pending_op, del);
MICROPY_PY_BLUETOOTH_EXIT
return del ? NULL : pending_op;
}
}
DEBUG_printf("btstack_finish_pending_operation: not found\n");
MICROPY_PY_BLUETOOTH_EXIT
return NULL;
}
#endif
// This needs to be separate to btstack_packet_handler otherwise we get
// dual-delivery of the HCI_EVENT_LE_META event.
STATIC void btstack_packet_handler_att_server(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
(void)channel;
(void)size;
DEBUG_printf("btstack_packet_handler_att_server(packet_type=%u, packet=%p)\n", packet_type, packet);
if (packet_type != HCI_EVENT_PACKET) {
return;
}
uint8_t event_type = hci_event_packet_get_type(packet);
if (event_type == ATT_EVENT_CONNECTED) {
DEBUG_printf(" --> att connected\n");
// The ATT_EVENT_*CONNECTED events are fired for both peripheral and central role, with no way to tell which.
// So we use the HCI_EVENT_LE_META event directly in the main packet handler.
} else if (event_type == ATT_EVENT_DISCONNECTED) {
DEBUG_printf(" --> att disconnected\n");
} else if (event_type == ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE) {
DEBUG_printf(" --> att indication complete\n");
uint16_t conn_handle = att_event_handle_value_indication_complete_get_conn_handle(packet);
uint16_t value_handle = att_event_handle_value_indication_complete_get_attribute_handle(packet);
uint8_t status = att_event_handle_value_indication_complete_get_status(packet);
mp_bluetooth_gatts_on_indicate_complete(conn_handle, value_handle, status);
} else if (event_type == ATT_EVENT_MTU_EXCHANGE_COMPLETE) {
// This is triggered in peripheral mode, when exchange initiated by us or remote.
uint16_t conn_handle = att_event_mtu_exchange_complete_get_handle(packet);
uint16_t mtu = att_event_mtu_exchange_complete_get_MTU(packet);
mp_bluetooth_gatts_on_mtu_exchanged(conn_handle, mtu);
} else if (event_type == HCI_EVENT_LE_META || event_type == HCI_EVENT_DISCONNECTION_COMPLETE) {
// Ignore, duplicated by att_server.c.
} else {
DEBUG_printf(" --> hci att server event type: unknown (0x%02x)\n", event_type);
}
}
#if MICROPY_BLUETOOTH_USE_ZEPHYR_STATIC_ADDRESS
// During startup, the controller (e.g. Zephyr) might give us a static address that we can use.
STATIC uint8_t controller_static_addr[6] = {0};
STATIC bool controller_static_addr_available = false;
STATIC const uint8_t read_static_address_command_complete_prefix[] = { 0x0e, 0x1b, 0x01, 0x09, 0xfc };
#endif
STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t irq) {
DEBUG_printf("btstack_packet_handler(packet_type=%u, packet=%p)\n", packet_type, packet);
if (packet_type != HCI_EVENT_PACKET) {
return;
}
uint8_t event_type = hci_event_packet_get_type(packet);
if (event_type == HCI_EVENT_LE_META) {
DEBUG_printf(" --> hci le meta\n");
switch (hci_event_le_meta_get_subevent_code(packet)) {
case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: {
uint16_t conn_handle = hci_subevent_le_connection_complete_get_connection_handle(packet);
uint8_t addr_type = hci_subevent_le_connection_complete_get_peer_address_type(packet);
bd_addr_t addr;
hci_subevent_le_connection_complete_get_peer_address(packet, addr);
uint16_t irq_event;
if (hci_subevent_le_connection_complete_get_role(packet) == 0) {
// Master role.
irq_event = MP_BLUETOOTH_IRQ_PERIPHERAL_CONNECT;
} else {
// Slave role.
irq_event = MP_BLUETOOTH_IRQ_CENTRAL_CONNECT;
}
mp_bluetooth_gap_on_connected_disconnected(irq_event, conn_handle, addr_type, addr);
break;
}
case HCI_SUBEVENT_LE_CONNECTION_UPDATE_COMPLETE: {
uint8_t status = hci_subevent_le_connection_update_complete_get_status(packet);
uint16_t conn_handle = hci_subevent_le_connection_update_complete_get_connection_handle(packet);
uint16_t conn_interval = hci_subevent_le_connection_update_complete_get_conn_interval(packet);
uint16_t conn_latency = hci_subevent_le_connection_update_complete_get_conn_latency(packet);
uint16_t supervision_timeout = hci_subevent_le_connection_update_complete_get_supervision_timeout(packet);
DEBUG_printf("- LE Connection %04x: connection update - connection interval %u.%02u ms, latency %u, timeout %u\n",
conn_handle, conn_interval * 125 / 100, 25 * (conn_interval & 3), conn_latency, supervision_timeout);
mp_bluetooth_gap_on_connection_update(conn_handle, conn_interval, conn_latency, supervision_timeout, status);
break;
}
}
} else if (event_type == BTSTACK_EVENT_STATE) {
uint8_t state = btstack_event_state_get_state(packet);
DEBUG_printf(" --> btstack event state 0x%02x\n", state);
if (state == HCI_STATE_WORKING) {
// Signal that initialisation has completed.
mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_ACTIVE;
} else if (state == HCI_STATE_HALTING) {
// Signal that de-initialisation has begun.
mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_HALTING;
} else if (state == HCI_STATE_OFF) {
// Signal that de-initialisation has completed.
mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
}
} else if (event_type == BTSTACK_EVENT_POWERON_FAILED) {
// Signal that initialisation has failed.
mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
} else if (event_type == HCI_EVENT_TRANSPORT_PACKET_SENT) {
DEBUG_printf(" --> hci transport packet sent\n");
} else if (event_type == HCI_EVENT_COMMAND_COMPLETE) {
DEBUG_printf(" --> hci command complete\n");
#if MICROPY_BLUETOOTH_USE_ZEPHYR_STATIC_ADDRESS
if (memcmp(packet, read_static_address_command_complete_prefix, sizeof(read_static_address_command_complete_prefix)) == 0) {
DEBUG_printf(" --> static address available\n");
reverse_48(&packet[7], controller_static_addr);
controller_static_addr_available = true;
}
#endif // MICROPY_BLUETOOTH_USE_ZEPHYR_STATIC_ADDRESS
} else if (event_type == HCI_EVENT_COMMAND_STATUS) {
DEBUG_printf(" --> hci command status\n");
} else if (event_type == HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS) {
DEBUG_printf(" --> hci number of completed packets\n");
} else if (event_type == BTSTACK_EVENT_NR_CONNECTIONS_CHANGED) {
DEBUG_printf(" --> btstack # conns changed\n");
} else if (event_type == HCI_EVENT_VENDOR_SPECIFIC) {
DEBUG_printf(" --> hci vendor specific\n");
} else if (event_type == SM_EVENT_AUTHORIZATION_RESULT ||
event_type == SM_EVENT_PAIRING_COMPLETE ||
// event_type == GAP_EVENT_DEDICATED_BONDING_COMPLETED || // No conn_handle
event_type == HCI_EVENT_ENCRYPTION_CHANGE) {
DEBUG_printf(" --> enc/auth/pair/bond change\n", );
#if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
uint16_t conn_handle;
switch (event_type) {
case SM_EVENT_AUTHORIZATION_RESULT:
conn_handle = sm_event_authorization_result_get_handle(packet);
break;
case SM_EVENT_PAIRING_COMPLETE:
conn_handle = sm_event_pairing_complete_get_handle(packet);
break;
case HCI_EVENT_ENCRYPTION_CHANGE:
conn_handle = hci_event_encryption_change_get_connection_handle(packet);
break;
default:
return;
}
hci_connection_t *hci_con = hci_connection_for_handle(conn_handle);
sm_connection_t *desc = &hci_con->sm_connection;
mp_bluetooth_gatts_on_encryption_update(conn_handle,
desc->sm_connection_encrypted,
desc->sm_connection_authenticated,
desc->sm_le_db_index != -1,
desc->sm_actual_encryption_key_size);
#endif // MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
} else if (event_type == HCI_EVENT_DISCONNECTION_COMPLETE) {
DEBUG_printf(" --> hci disconnect complete\n");
uint16_t conn_handle = hci_event_disconnection_complete_get_connection_handle(packet);
const hci_connection_t *conn = hci_connection_for_handle(conn_handle);
uint16_t irq_event;
if (conn == NULL || conn->role == 0) {
// Master role.
irq_event = MP_BLUETOOTH_IRQ_PERIPHERAL_DISCONNECT;
} else {
// Slave role.
irq_event = MP_BLUETOOTH_IRQ_CENTRAL_DISCONNECT;
}
uint8_t addr[6] = {0};
mp_bluetooth_gap_on_connected_disconnected(irq_event, conn_handle, 0xff, addr);
#if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
} else if (event_type == GAP_EVENT_ADVERTISING_REPORT) {
DEBUG_printf(" --> gap advertising report\n");
bd_addr_t address;
gap_event_advertising_report_get_address(packet, address);
uint8_t adv_event_type = gap_event_advertising_report_get_advertising_event_type(packet);
uint8_t address_type = gap_event_advertising_report_get_address_type(packet);
int8_t rssi = gap_event_advertising_report_get_rssi(packet);
uint8_t length = gap_event_advertising_report_get_data_length(packet);
const uint8_t *data = gap_event_advertising_report_get_data(packet);
mp_bluetooth_gap_on_scan_result(address_type, address, adv_event_type, rssi, data, length);
#endif // MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
#if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
} else if (event_type == GATT_EVENT_QUERY_COMPLETE) {
uint16_t conn_handle = gatt_event_query_complete_get_handle(packet);
uint16_t status = gatt_event_query_complete_get_att_status(packet);
DEBUG_printf(" --> gatt query complete irq=%d conn_handle=%d status=%d\n", irq, conn_handle, status);
if (irq == MP_BLUETOOTH_IRQ_GATTC_READ_DONE || irq == MP_BLUETOOTH_IRQ_GATTC_WRITE_DONE) {
// TODO there is no value_handle available to pass here.
// TODO try and get this implemented in btstack.
mp_bluetooth_gattc_on_read_write_status(irq, conn_handle, 0xffff, status);
// Unref the saved buffer for the write operation on this conn_handle.
if (irq == MP_BLUETOOTH_IRQ_GATTC_WRITE_DONE) {
btstack_finish_pending_operation(MP_BLUETOOTH_BTSTACK_PENDING_WRITE, conn_handle, 0xffff, false /* del */);
}
} else if (irq == MP_BLUETOOTH_IRQ_GATTC_SERVICE_DONE ||
irq == MP_BLUETOOTH_IRQ_GATTC_CHARACTERISTIC_DONE ||
irq == MP_BLUETOOTH_IRQ_GATTC_DESCRIPTOR_DONE) {
mp_bluetooth_gattc_on_discover_complete(irq, conn_handle, status);
}
} else if (event_type == GATT_EVENT_SERVICE_QUERY_RESULT) {
DEBUG_printf(" --> gatt service query result\n");
uint16_t conn_handle = gatt_event_service_query_result_get_handle(packet);
gatt_client_service_t service;
gatt_event_service_query_result_get_service(packet, &service);
mp_obj_bluetooth_uuid_t service_uuid = create_mp_uuid(service.uuid16, service.uuid128);
mp_bluetooth_gattc_on_primary_service_result(conn_handle, service.start_group_handle, service.end_group_handle, &service_uuid);
} else if (event_type == GATT_EVENT_CHARACTERISTIC_QUERY_RESULT) {
DEBUG_printf(" --> gatt characteristic query result\n");
uint16_t conn_handle = gatt_event_characteristic_query_result_get_handle(packet);
gatt_client_characteristic_t characteristic;
gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic);
mp_obj_bluetooth_uuid_t characteristic_uuid = create_mp_uuid(characteristic.uuid16, characteristic.uuid128);
mp_bluetooth_gattc_on_characteristic_result(conn_handle, characteristic.start_handle, characteristic.value_handle, characteristic.properties, &characteristic_uuid);
} else if (event_type == GATT_EVENT_CHARACTERISTIC_DESCRIPTOR_QUERY_RESULT) {
DEBUG_printf(" --> gatt descriptor query result\n");
uint16_t conn_handle = gatt_event_all_characteristic_descriptors_query_result_get_handle(packet);
gatt_client_characteristic_descriptor_t descriptor;
gatt_event_all_characteristic_descriptors_query_result_get_characteristic_descriptor(packet, &descriptor);
mp_obj_bluetooth_uuid_t descriptor_uuid = create_mp_uuid(descriptor.uuid16, descriptor.uuid128);
mp_bluetooth_gattc_on_descriptor_result(conn_handle, descriptor.handle, &descriptor_uuid);
} else if (event_type == GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT) {
DEBUG_printf(" --> gatt characteristic value query result\n");
uint16_t conn_handle = gatt_event_characteristic_value_query_result_get_handle(packet);
uint16_t value_handle = gatt_event_characteristic_value_query_result_get_value_handle(packet);
uint16_t len = gatt_event_characteristic_value_query_result_get_value_length(packet);
const uint8_t *data = gatt_event_characteristic_value_query_result_get_value(packet);
mp_bluetooth_gattc_on_data_available(MP_BLUETOOTH_IRQ_GATTC_READ_RESULT, conn_handle, value_handle, &data, &len, 1);
} else if (event_type == GATT_EVENT_NOTIFICATION) {
DEBUG_printf(" --> gatt notification\n");
uint16_t conn_handle = gatt_event_notification_get_handle(packet);
uint16_t value_handle = gatt_event_notification_get_value_handle(packet);
uint16_t len = gatt_event_notification_get_value_length(packet);
const uint8_t *data = gatt_event_notification_get_value(packet);
mp_bluetooth_gattc_on_data_available(MP_BLUETOOTH_IRQ_GATTC_NOTIFY, conn_handle, value_handle, &data, &len, 1);
} else if (event_type == GATT_EVENT_INDICATION) {
DEBUG_printf(" --> gatt indication\n");
uint16_t conn_handle = gatt_event_indication_get_handle(packet);
uint16_t value_handle = gatt_event_indication_get_value_handle(packet);
uint16_t len = gatt_event_indication_get_value_length(packet);
const uint8_t *data = gatt_event_indication_get_value(packet);
mp_bluetooth_gattc_on_data_available(MP_BLUETOOTH_IRQ_GATTC_INDICATE, conn_handle, value_handle, &data, &len, 1);
} else if (event_type == GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE) {
uint16_t conn_handle = gatt_event_can_write_without_response_get_handle(packet);
DEBUG_printf(" --> gatt can write without response %d\n", conn_handle);
mp_btstack_pending_op_t *pending_op = btstack_finish_pending_operation(MP_BLUETOOTH_BTSTACK_PENDING_WRITE_NO_RESPONSE, conn_handle, 0xffff, false /* !del */);
if (pending_op) {
DEBUG_printf(" --> ready for value_handle=%d len=%zu\n", pending_op->value_handle, pending_op->len);
gatt_client_write_value_of_characteristic_without_response(pending_op->conn_handle, pending_op->value_handle, pending_op->len, (uint8_t *)pending_op->buf);
// Note: Can't "del" the pending_op from IRQ context. Leave it for the GC.
}
#endif // MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
} else {
DEBUG_printf(" --> hci event type: unknown (0x%02x)\n", event_type);
}
}
// Because the packet handler callbacks don't support an argument, we use a specific
// handler when we need to provide additional state to the handler (in the "irq" parameter).
// This is the generic handler for when you don't need extra state.
STATIC void btstack_packet_handler_generic(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
(void)channel;
(void)size;
btstack_packet_handler(packet_type, packet, 0);
}
STATIC btstack_packet_callback_registration_t hci_event_callback_registration = {
.callback = &btstack_packet_handler_generic
};
#if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
// For when the handler is being used for service discovery.
STATIC void btstack_packet_handler_discover_services(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
(void)channel;
(void)size;
btstack_packet_handler(packet_type, packet, MP_BLUETOOTH_IRQ_GATTC_SERVICE_DONE);
}
// For when the handler is being used for characteristic discovery.
STATIC void btstack_packet_handler_discover_characteristics(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
(void)channel;
(void)size;
btstack_packet_handler(packet_type, packet, MP_BLUETOOTH_IRQ_GATTC_CHARACTERISTIC_DONE);
}
// For when the handler is being used for descriptor discovery.
STATIC void btstack_packet_handler_discover_descriptors(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
(void)channel;
(void)size;
btstack_packet_handler(packet_type, packet, MP_BLUETOOTH_IRQ_GATTC_DESCRIPTOR_DONE);
}
// For when the handler is being used for a read query.
STATIC void btstack_packet_handler_read(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
(void)channel;
(void)size;
btstack_packet_handler(packet_type, packet, MP_BLUETOOTH_IRQ_GATTC_READ_DONE);
}
// For when the handler is being used for write-with-response.
STATIC void btstack_packet_handler_write_with_response(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
(void)channel;
(void)size;
btstack_packet_handler(packet_type, packet, MP_BLUETOOTH_IRQ_GATTC_WRITE_DONE);
}
#endif // MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
STATIC btstack_timer_source_t btstack_init_deinit_timeout;
STATIC void btstack_init_deinit_timeout_handler(btstack_timer_source_t *ds) {
(void)ds;
// Stop waiting for initialisation.
// This signals both the loops in mp_bluetooth_init and mp_bluetooth_deinit,
// as well as ports that run a polling loop.
mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_TIMEOUT;
}
#if !MICROPY_BLUETOOTH_USE_MP_HAL_GET_MAC_STATIC_ADDRESS
STATIC void btstack_static_address_ready(void *arg) {
DEBUG_printf("btstack_static_address_ready.\n");
*(volatile bool *)arg = true;
}
#endif
STATIC bool set_public_address(void) {
bd_addr_t local_addr;
gap_local_bd_addr(local_addr);
bd_addr_t null_addr = {0};
if (memcmp(local_addr, null_addr, 6) == 0) {
DEBUG_printf("set_public_address: No public address available.\n");
return false;
}
DEBUG_printf("set_public_address: Using controller's public address.\n");
gap_random_address_set_mode(GAP_RANDOM_ADDRESS_TYPE_OFF);
return true;
}
STATIC void set_random_address(void) {
#if MICROPY_BLUETOOTH_USE_ZEPHYR_STATIC_ADDRESS
if (controller_static_addr_available) {
DEBUG_printf("set_random_address: Using static address supplied by controller.\n");
gap_random_address_set(controller_static_addr);
} else
#endif // MICROPY_BLUETOOTH_USE_ZEPHYR_STATIC_ADDRESS
{
bd_addr_t static_addr;
#if MICROPY_BLUETOOTH_USE_MP_HAL_GET_MAC_STATIC_ADDRESS
DEBUG_printf("set_random_address: Generating static address using mp_hal_get_mac\n");
mp_hal_get_mac(MP_HAL_MAC_BDADDR, static_addr);
// Mark it as STATIC (not RPA or NRPA).
static_addr[0] |= 0xc0;
#else
DEBUG_printf("set_random_address: Generating random static address.\n");
btstack_crypto_random_t sm_crypto_random_request;
volatile bool ready = false;
btstack_crypto_random_generate(&sm_crypto_random_request, static_addr, 6, &btstack_static_address_ready, (void *)&ready);
while (!ready) {
MICROPY_EVENT_POLL_HOOK
}
#endif // MICROPY_BLUETOOTH_USE_MP_HAL_GET_MAC_STATIC_ADDRESS
DEBUG_printf("set_random_address: Address generated.\n");
gap_random_address_set(static_addr);
}
// Wait for the controller to accept this address.
while (true) {
uint8_t addr_type;
bd_addr_t addr;
gap_le_get_own_address(&addr_type, addr);
bd_addr_t null_addr = {0};
if (memcmp(addr, null_addr, 6) != 0) {
break;
}
MICROPY_EVENT_POLL_HOOK
}
DEBUG_printf("set_random_address: Address loaded by controller\n");
}
int mp_bluetooth_init(void) {
DEBUG_printf("mp_bluetooth_init\n");
if (mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_ACTIVE) {
return 0;
}
// Clean up if necessary.
mp_bluetooth_deinit();
btstack_memory_init();
#if MICROPY_BLUETOOTH_USE_ZEPHYR_STATIC_ADDRESS
controller_static_addr_available = false;
#endif
MP_STATE_PORT(bluetooth_btstack_root_pointers) = m_new0(mp_bluetooth_btstack_root_pointers_t, 1);
mp_bluetooth_gatts_db_create(&MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db);
// Set the default GAP device name.
const char *gap_name = MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME;
size_t gap_len = strlen(gap_name);
mp_bluetooth_gatts_db_create_entry(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, BTSTACK_GAP_DEVICE_NAME_HANDLE, gap_len);
mp_bluetooth_gap_set_device_name((const uint8_t *)gap_name, gap_len);
mp_bluetooth_btstack_port_init();
mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_STARTING;
l2cap_init();
le_device_db_init();
sm_init();
// Set blank ER/IR keys to suppress BTstack warning.
// TODO handle this correctly.
sm_key_t dummy_key;
memset(dummy_key, 0, sizeof(dummy_key));
sm_set_er(dummy_key);
sm_set_ir(dummy_key);
#if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
gatt_client_init();
// We always require explicitly exchanging MTU with ble.gattc_exchange_mtu().
gatt_client_mtu_enable_auto_negotiation(false);
#endif // MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
// Register for HCI events.
hci_add_event_handler(&hci_event_callback_registration);
// Register for ATT server events.
att_server_register_packet_handler(&btstack_packet_handler_att_server);
// Set a timeout for HCI initialisation.
btstack_run_loop_set_timer(&btstack_init_deinit_timeout, BTSTACK_INIT_DEINIT_TIMEOUT_MS);
btstack_run_loop_set_timer_handler(&btstack_init_deinit_timeout, btstack_init_deinit_timeout_handler);
btstack_run_loop_add_timer(&btstack_init_deinit_timeout);
DEBUG_printf("mp_bluetooth_init: waiting for stack startup\n");
// Either the HCI event will set state to ACTIVE, or the timeout will set it to TIMEOUT.
mp_bluetooth_btstack_port_start();
while (mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_STARTING) {
MICROPY_EVENT_POLL_HOOK
}
btstack_run_loop_remove_timer(&btstack_init_deinit_timeout);
// Check for timeout.
if (mp_bluetooth_btstack_state != MP_BLUETOOTH_BTSTACK_STATE_ACTIVE) {
DEBUG_printf("mp_bluetooth_init: stack startup timed out\n");
bool timeout = mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_TIMEOUT;
// Required to stop the polling loop.
mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
// Attempt a shutdown (may not do anything).
mp_bluetooth_btstack_port_deinit();
// Clean up.
MP_STATE_PORT(bluetooth_btstack_root_pointers) = NULL;
return timeout ? MP_ETIMEDOUT : MP_EINVAL;
}
DEBUG_printf("mp_bluetooth_init: stack startup complete\n");
// At this point if the controller has its own public address, btstack will know this.
// However, if this is not available, then attempt to get a static address:
// - For a Zephyr controller on nRF, a static address will be available during startup.
// - Otherwise we ask the controller to generate a static address for us.
// In either case, calling gap_random_address_set will set the mode to STATIC, and then
// immediately set the address on the controller. We then wait until this address becomes available.
if (!set_public_address()) {
set_random_address();
}
#if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
// Enable GATT_EVENT_NOTIFICATION/GATT_EVENT_INDICATION for all connections and handles.
gatt_client_listen_for_characteristic_value_updates(&MP_STATE_PORT(bluetooth_btstack_root_pointers)->notification, &btstack_packet_handler_generic, GATT_CLIENT_ANY_CONNECTION, NULL);
#endif // MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
return 0;
}
void mp_bluetooth_deinit(void) {
DEBUG_printf("mp_bluetooth_deinit\n");
// Nothing to do if not initialised.
if (!MP_STATE_PORT(bluetooth_btstack_root_pointers)) {
return;
}
mp_bluetooth_gap_advertise_stop();
#if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
// Remove our registration for notify/indicate.
gatt_client_stop_listening_for_characteristic_value_updates(&MP_STATE_PORT(bluetooth_btstack_root_pointers)->notification);
#endif // MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
// Set a timer that will forcibly set the state to TIMEOUT, which will stop the loop below.
btstack_run_loop_set_timer(&btstack_init_deinit_timeout, BTSTACK_INIT_DEINIT_TIMEOUT_MS);
btstack_run_loop_add_timer(&btstack_init_deinit_timeout);
// This should result in a clean shutdown, which will set the state to OFF.
// On Unix this is blocking (it joins on the poll thread), on other ports the loop below will wait unil
// either timeout or clean shutdown.
mp_bluetooth_btstack_port_deinit();
while (mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_ACTIVE) {
MICROPY_EVENT_POLL_HOOK
}
btstack_run_loop_remove_timer(&btstack_init_deinit_timeout);
mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
MP_STATE_PORT(bluetooth_btstack_root_pointers) = NULL;
DEBUG_printf("mp_bluetooth_deinit: complete\n");
}
bool mp_bluetooth_is_active(void) {
return mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_ACTIVE;
}
void mp_bluetooth_get_current_address(uint8_t *addr_type, uint8_t *addr) {
if (!mp_bluetooth_is_active()) {
mp_raise_OSError(ERRNO_BLUETOOTH_NOT_ACTIVE);
}
DEBUG_printf("mp_bluetooth_get_current_address\n");
gap_le_get_own_address(addr_type, addr);
}
void mp_bluetooth_set_address_mode(uint8_t addr_mode) {
if (!mp_bluetooth_is_active()) {
mp_raise_OSError(ERRNO_BLUETOOTH_NOT_ACTIVE);
}
switch (addr_mode) {
case MP_BLUETOOTH_ADDRESS_MODE_PUBLIC: {
DEBUG_printf("mp_bluetooth_set_address_mode: public\n");
if (!set_public_address()) {
// No public address available.
mp_raise_OSError(MP_EINVAL);
}
break;
}
case MP_BLUETOOTH_ADDRESS_MODE_RANDOM: {
DEBUG_printf("mp_bluetooth_set_address_mode: random\n");
set_random_address();
break;
}
case MP_BLUETOOTH_ADDRESS_MODE_RPA:
case MP_BLUETOOTH_ADDRESS_MODE_NRPA:
// Not yet supported.
mp_raise_OSError(MP_EINVAL);
}
}
#if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
void mp_bluetooth_set_bonding(bool enabled) {
if (enabled) {
mp_bluetooth_btstack_sm_auth_req |= SM_AUTHREQ_BONDING;
} else {
mp_bluetooth_btstack_sm_auth_req &= ~SM_AUTHREQ_BONDING;
}
sm_set_authentication_requirements(mp_bluetooth_btstack_sm_auth_req);
}
void mp_bluetooth_set_mitm_protection(bool enabled) {
if (enabled) {
mp_bluetooth_btstack_sm_auth_req |= SM_AUTHREQ_MITM_PROTECTION;
} else {
mp_bluetooth_btstack_sm_auth_req &= ~SM_AUTHREQ_MITM_PROTECTION;
}
sm_set_authentication_requirements(mp_bluetooth_btstack_sm_auth_req);
}
void mp_bluetooth_set_le_secure(bool enabled) {
if (enabled) {
mp_bluetooth_btstack_sm_auth_req |= SM_AUTHREQ_SECURE_CONNECTION;
} else {
mp_bluetooth_btstack_sm_auth_req &= ~SM_AUTHREQ_SECURE_CONNECTION;
}
sm_set_authentication_requirements(mp_bluetooth_btstack_sm_auth_req);
}
void mp_bluetooth_set_io_capability(uint8_t capability) {
sm_set_io_capabilities(capability);
}
#endif // MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
size_t mp_bluetooth_gap_get_device_name(const uint8_t **buf) {
uint8_t *value = NULL;
size_t value_len = 0;
mp_bluetooth_gatts_db_read(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, BTSTACK_GAP_DEVICE_NAME_HANDLE, &value, &value_len);
*buf = value;
return value_len;
}
int mp_bluetooth_gap_set_device_name(const uint8_t *buf, size_t len) {
return mp_bluetooth_gatts_db_write(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, BTSTACK_GAP_DEVICE_NAME_HANDLE, buf, len);
}
int mp_bluetooth_gap_advertise_start(bool connectable, int32_t interval_us, const uint8_t *adv_data, size_t adv_data_len, const uint8_t *sr_data, size_t sr_data_len) {
DEBUG_printf("mp_bluetooth_gap_advertise_start\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
uint16_t adv_int_min = interval_us / 625;
uint16_t adv_int_max = interval_us / 625;
uint8_t adv_type = connectable ? 0 : 2;
bd_addr_t null_addr = {0};
uint8_t direct_address_type = 0;
uint8_t channel_map = 0x07; // Use all three broadcast channels.
uint8_t filter_policy = 0x00; // None.
gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, direct_address_type, null_addr, channel_map, filter_policy);
// Copy the adv_data and sr_data into a persistent buffer (which is findable via the btstack root pointers).
size_t total_bytes = adv_data_len + sr_data_len;
if (total_bytes > MP_STATE_PORT(bluetooth_btstack_root_pointers)->adv_data_alloc) {
// Resize if necessary.
MP_STATE_PORT(bluetooth_btstack_root_pointers)->adv_data = m_new(uint8_t, total_bytes);
MP_STATE_PORT(bluetooth_btstack_root_pointers)->adv_data_alloc = total_bytes;
}
uint8_t *data = MP_STATE_PORT(bluetooth_btstack_root_pointers)->adv_data;
if (adv_data) {
memcpy(data, (uint8_t *)adv_data, adv_data_len);
gap_advertisements_set_data(adv_data_len, data);
data += adv_data_len;
}
if (sr_data) {
memcpy(data, (uint8_t *)sr_data, sr_data_len);
gap_scan_response_set_data(sr_data_len, data);
}
gap_advertisements_enable(true);
return 0;
}
void mp_bluetooth_gap_advertise_stop(void) {
DEBUG_printf("mp_bluetooth_gap_advertise_stop\n");
if (!mp_bluetooth_is_active()) {
return;
}
gap_advertisements_enable(false);
MP_STATE_PORT(bluetooth_btstack_root_pointers)->adv_data_alloc = 0;
MP_STATE_PORT(bluetooth_btstack_root_pointers)->adv_data = NULL;
}
int mp_bluetooth_gatts_register_service_begin(bool append) {
DEBUG_printf("mp_bluetooth_gatts_register_service_begin\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
if (!append) {
// This will reset the DB.
// Becase the DB is statically allocated, there's no problem with just re-initing it.
// Note this would be a memory leak if we enabled HAVE_MALLOC (there's no API to free the existing db).
att_db_util_init();
att_db_util_add_service_uuid16(GAP_SERVICE_UUID);
uint16_t handle = att_db_util_add_characteristic_uuid16(GAP_DEVICE_NAME_UUID, ATT_PROPERTY_READ | ATT_PROPERTY_DYNAMIC, ATT_SECURITY_NONE, ATT_SECURITY_NONE, NULL, 0);
assert(handle == BTSTACK_GAP_DEVICE_NAME_HANDLE);
(void)handle;
att_db_util_add_service_uuid16(0x1801);
att_db_util_add_characteristic_uuid16(0x2a05, ATT_PROPERTY_READ, ATT_SECURITY_NONE, ATT_SECURITY_NONE, NULL, 0);
}
return 0;
}
STATIC uint16_t att_read_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t offset, uint8_t *buffer, uint16_t buffer_size) {
// Should return data length, 0 for error, or -1 for delayed response.
// For more details search "*att_read_callback*" in micropython/lib/btstack/doc/manual/docs/profiles.md
(void)connection_handle;
DEBUG_printf("att_read_callback (handle: %u, offset: %u, buffer: %p, size: %u)\n", att_handle, offset, buffer, buffer_size);
mp_bluetooth_gatts_db_entry_t *entry = mp_bluetooth_gatts_db_lookup(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, att_handle);
if (!entry) {
DEBUG_printf("att_read_callback handle not found\n");
return 0;
}
// Allow Python code to override value (by using gatts_write), or deny (by returning false) the read.
// Note this will be a no-op if the ringbuffer implementation is being used, as the Python callback cannot
// be executed synchronously. This is currently always the case for btstack.
if ((buffer == NULL) && (buffer_size == 0)) {
if (!mp_bluetooth_gatts_on_read_request(connection_handle, att_handle)) {
DEBUG_printf("att_read_callback: read request denied\n");
return 0;
}
}
uint16_t ret = att_read_callback_handle_blob(entry->data, entry->data_len, offset, buffer, buffer_size);
return ret;
}
STATIC int att_write_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size) {
(void)offset;
(void)transaction_mode;
DEBUG_printf("att_write_callback (handle: %u, mode: %u, offset: %u, buffer: %p, size: %u)\n", att_handle, transaction_mode, offset, buffer, buffer_size);
mp_bluetooth_gatts_db_entry_t *entry = mp_bluetooth_gatts_db_lookup(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, att_handle);
if (!entry) {
DEBUG_printf("att_write_callback handle not found\n");
return 0; // TODO: Find status code for not-found.
}
// TODO: Use `offset` arg.
size_t append_offset = 0;
if (entry->append) {
append_offset = entry->data_len;
}
entry->data_len = MIN(entry->data_alloc, buffer_size + append_offset);
memcpy(entry->data + append_offset, buffer, entry->data_len - append_offset);
mp_bluetooth_gatts_on_write(connection_handle, att_handle);
return 0;
}
STATIC inline uint16_t get_uuid16(const mp_obj_bluetooth_uuid_t *uuid) {
return (uuid->data[1] << 8) | uuid->data[0];
}
// Map MP_BLUETOOTH_CHARACTERISTIC_FLAG_ values to btstack read/write permission values.
STATIC void get_characteristic_permissions(uint16_t flags, uint16_t *read_permission, uint16_t *write_permission) {
if (flags & MP_BLUETOOTH_CHARACTERISTIC_FLAG_READ_ENCRYPTED) {
*read_permission = ATT_SECURITY_ENCRYPTED;
} else if (flags & MP_BLUETOOTH_CHARACTERISTIC_FLAG_READ_AUTHENTICATED) {
*read_permission = ATT_SECURITY_AUTHENTICATED;
} else if (flags & MP_BLUETOOTH_CHARACTERISTIC_FLAG_READ_AUTHORIZED) {
*read_permission = ATT_SECURITY_AUTHORIZED;
} else {
*read_permission = ATT_SECURITY_NONE;
}
if (flags & MP_BLUETOOTH_CHARACTERISTIC_FLAG_WRITE_ENCRYPTED) {
*write_permission = ATT_SECURITY_ENCRYPTED;
} else if (flags & MP_BLUETOOTH_CHARACTERISTIC_FLAG_WRITE_AUTHENTICATED) {
*write_permission = ATT_SECURITY_AUTHENTICATED;
} else if (flags & MP_BLUETOOTH_CHARACTERISTIC_FLAG_WRITE_AUTHORIZED) {
*write_permission = ATT_SECURITY_AUTHORIZED;
} else {
*write_permission = ATT_SECURITY_NONE;
}
}
int mp_bluetooth_gatts_register_service(mp_obj_bluetooth_uuid_t *service_uuid, mp_obj_bluetooth_uuid_t **characteristic_uuids, uint16_t *characteristic_flags, mp_obj_bluetooth_uuid_t **descriptor_uuids, uint16_t *descriptor_flags, uint8_t *num_descriptors, uint16_t *handles, size_t num_characteristics) {
DEBUG_printf("mp_bluetooth_gatts_register_service\n");
// Note: btstack expects BE UUIDs (which it immediately convertes to LE).
// So we have to convert all our modbluetooth LE UUIDs to BE just for the att_db_util_add_* methods (using get_uuid16 above, and reverse_128 from btstackutil.h).
// TODO: btstack's att_db_util_add_* methods have no bounds checking or validation.
// Need some way to prevent additional services being added if we're out of space in the static buffer.
if (service_uuid->type == MP_BLUETOOTH_UUID_TYPE_16) {
att_db_util_add_service_uuid16(get_uuid16(service_uuid));
} else if (service_uuid->type == MP_BLUETOOTH_UUID_TYPE_128) {
uint8_t buffer[16];
reverse_128(service_uuid->data, buffer);
att_db_util_add_service_uuid128(buffer);
} else {
return MP_EINVAL;
}
size_t handle_index = 0;
size_t descriptor_index = 0;
static uint8_t cccb_buf[2] = {0};
for (size_t i = 0; i < num_characteristics; ++i) {
uint16_t props = (characteristic_flags[i] & 0x7f) | ATT_PROPERTY_DYNAMIC;
uint16_t read_permission, write_permission;
get_characteristic_permissions(characteristic_flags[i], &read_permission, &write_permission);
if (characteristic_uuids[i]->type == MP_BLUETOOTH_UUID_TYPE_16) {
handles[handle_index] = att_db_util_add_characteristic_uuid16(get_uuid16(characteristic_uuids[i]), props, read_permission, write_permission, NULL, 0);
} else if (characteristic_uuids[i]->type == MP_BLUETOOTH_UUID_TYPE_128) {
uint8_t buffer[16];
reverse_128(characteristic_uuids[i]->data, buffer);
handles[handle_index] = att_db_util_add_characteristic_uuid128(buffer, props, read_permission, write_permission, NULL, 0);
} else {
return MP_EINVAL;
}
mp_bluetooth_gatts_db_create_entry(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, handles[handle_index], MP_BLUETOOTH_DEFAULT_ATTR_LEN);
// If a NOTIFY or INDICATE characteristic is added, then we need to manage a value for the CCCB.
if (props & (ATT_PROPERTY_NOTIFY | ATT_PROPERTY_INDICATE)) {
// btstack creates the CCCB as the next handle.
mp_bluetooth_gatts_db_create_entry(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, handles[handle_index] + 1, MP_BLUETOOTH_CCCB_LEN);
int ret = mp_bluetooth_gatts_db_write(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, handles[handle_index] + 1, cccb_buf, sizeof(cccb_buf));
if (ret) {
return ret;
}
}
DEBUG_printf("mp_bluetooth_gatts_register_service: Registered char with handle %u\n", handles[handle_index]);
++handle_index;
for (size_t j = 0; j < num_descriptors[i]; ++j) {
props = (descriptor_flags[descriptor_index] & 0x7f) | ATT_PROPERTY_DYNAMIC;
get_characteristic_permissions(descriptor_flags[descriptor_index], &read_permission, &write_permission);
if (descriptor_uuids[descriptor_index]->type == MP_BLUETOOTH_UUID_TYPE_16) {
handles[handle_index] = att_db_util_add_descriptor_uuid16(get_uuid16(descriptor_uuids[descriptor_index]), props, read_permission, write_permission, NULL, 0);
} else if (descriptor_uuids[descriptor_index]->type == MP_BLUETOOTH_UUID_TYPE_128) {
uint8_t buffer[16];
reverse_128(descriptor_uuids[descriptor_index]->data, buffer);
handles[handle_index] = att_db_util_add_descriptor_uuid128(buffer, props, read_permission, write_permission, NULL, 0);
} else {
return MP_EINVAL;
}
mp_bluetooth_gatts_db_create_entry(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, handles[handle_index], MP_BLUETOOTH_DEFAULT_ATTR_LEN);
DEBUG_printf("mp_bluetooth_gatts_register_service: Registered desc with handle %u\n", handles[handle_index]);
++descriptor_index;
++handle_index;
}
}
return 0;
}
int mp_bluetooth_gatts_register_service_end(void) {
DEBUG_printf("mp_bluetooth_gatts_register_service_end\n");
att_server_init(att_db_util_get_address(), &att_read_callback, &att_write_callback);
return 0;
}
int mp_bluetooth_gatts_read(uint16_t value_handle, uint8_t **value, size_t *value_len) {
DEBUG_printf("mp_bluetooth_gatts_read\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
return mp_bluetooth_gatts_db_read(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, value_handle, value, value_len);
}
int mp_bluetooth_gatts_write(uint16_t value_handle, const uint8_t *value, size_t value_len) {
DEBUG_printf("mp_bluetooth_gatts_write\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
return mp_bluetooth_gatts_db_write(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, value_handle, value, value_len);
}
int mp_bluetooth_gatts_notify(uint16_t conn_handle, uint16_t value_handle) {
DEBUG_printf("mp_bluetooth_gatts_notify\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
// Note: btstack doesn't appear to support sending a notification without a value, so include the stored value.
uint8_t *data = NULL;
size_t len = 0;
mp_bluetooth_gatts_db_read(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, value_handle, &data, &len);
return mp_bluetooth_gatts_notify_send(conn_handle, value_handle, data, len);
}
int mp_bluetooth_gatts_notify_send(uint16_t conn_handle, uint16_t value_handle, const uint8_t *value, size_t value_len) {
DEBUG_printf("mp_bluetooth_gatts_notify_send\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
// Attempt to send immediately. If it succeeds, btstack will copy the buffer.
MICROPY_PY_BLUETOOTH_ENTER
int err = att_server_notify(conn_handle, value_handle, value, value_len);
MICROPY_PY_BLUETOOTH_EXIT
if (err == BTSTACK_ACL_BUFFERS_FULL) {
DEBUG_printf("mp_bluetooth_gatts_notify_send: ACL buffer full, scheduling callback\n");
// Schedule callback, making a copy of the buffer.
mp_btstack_pending_op_t *pending_op = btstack_enqueue_pending_operation(MP_BLUETOOTH_BTSTACK_PENDING_NOTIFY, conn_handle, value_handle, value, value_len);
err = att_server_request_to_send_notification(&pending_op->context_registration, conn_handle);
if (err != ERROR_CODE_SUCCESS) {
// Failure. Unref and free the pending operation.
btstack_remove_pending_operation(pending_op, true /* del */);
}
return 0;
} else {
return btstack_error_to_errno(err);
}
}
int mp_bluetooth_gatts_indicate(uint16_t conn_handle, uint16_t value_handle) {
DEBUG_printf("mp_bluetooth_gatts_indicate\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
uint8_t *data = NULL;
size_t len = 0;
mp_bluetooth_gatts_db_read(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, value_handle, &data, &len);
// Indicate will raise ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE when
// acknowledged (or timeout/error).
// Attempt to send immediately, will copy buffer.
MICROPY_PY_BLUETOOTH_ENTER
int err = att_server_indicate(conn_handle, value_handle, data, len);
MICROPY_PY_BLUETOOTH_EXIT
if (err == BTSTACK_ACL_BUFFERS_FULL) {
DEBUG_printf("mp_bluetooth_gatts_indicate: ACL buffer full, scheduling callback\n");
// Schedule callback, making a copy of the buffer.
mp_btstack_pending_op_t *pending_op = btstack_enqueue_pending_operation(MP_BLUETOOTH_BTSTACK_PENDING_INDICATE, conn_handle, value_handle, data, len);
err = att_server_request_to_send_indication(&pending_op->context_registration, conn_handle);
if (err != ERROR_CODE_SUCCESS) {
// Failure. Unref and free the pending operation.
btstack_remove_pending_operation(pending_op, true /* del */);
}
return 0;
} else {
return btstack_error_to_errno(err);
}
}
int mp_bluetooth_gatts_set_buffer(uint16_t value_handle, size_t len, bool append) {
DEBUG_printf("mp_bluetooth_gatts_set_buffer\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
return mp_bluetooth_gatts_db_resize(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, value_handle, len, append);
}
int mp_bluetooth_get_preferred_mtu(void) {
if (!mp_bluetooth_is_active()) {
mp_raise_OSError(ERRNO_BLUETOOTH_NOT_ACTIVE);
}
return l2cap_max_le_mtu();
}
int mp_bluetooth_set_preferred_mtu(uint16_t mtu) {
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
l2cap_set_max_le_mtu(mtu);
if (l2cap_max_le_mtu() != mtu) {
return MP_EINVAL;
}
return 0;
}
int mp_bluetooth_gap_disconnect(uint16_t conn_handle) {
DEBUG_printf("mp_bluetooth_gap_disconnect\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
gap_disconnect(conn_handle);
return 0;
}
#if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
int mp_bluetooth_gap_pair(uint16_t conn_handle) {
DEBUG_printf("mp_bluetooth_gap_pair: conn_handle=%d\n", conn_handle);
sm_request_pairing(conn_handle);
return 0;
}
int mp_bluetooth_gap_passkey(uint16_t conn_handle, uint8_t action, mp_int_t passkey) {
DEBUG_printf("mp_bluetooth_gap_passkey: conn_handle=%d action=%d passkey=%d\n", conn_handle, action, (int)passkey);
return MP_EOPNOTSUPP;
}
#endif // MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
#if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
STATIC btstack_timer_source_t scan_duration_timeout;
STATIC void scan_duration_timeout_handler(btstack_timer_source_t *ds) {
(void)ds;
mp_bluetooth_gap_scan_stop();
}
int mp_bluetooth_gap_scan_start(int32_t duration_ms, int32_t interval_us, int32_t window_us, bool active_scan) {
DEBUG_printf("mp_bluetooth_gap_scan_start\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
if (duration_ms > 0) {
btstack_run_loop_set_timer(&scan_duration_timeout, duration_ms);
btstack_run_loop_set_timer_handler(&scan_duration_timeout, scan_duration_timeout_handler);
btstack_run_loop_add_timer(&scan_duration_timeout);
}
gap_set_scan_parameters(active_scan ? 1 : 0, interval_us / 625, window_us / 625);
gap_start_scan();
return 0;
}
int mp_bluetooth_gap_scan_stop(void) {
DEBUG_printf("mp_bluetooth_gap_scan_stop\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
btstack_run_loop_remove_timer(&scan_duration_timeout);
gap_stop_scan();
mp_bluetooth_gap_on_scan_complete();
return 0;
}
int mp_bluetooth_gap_peripheral_connect(uint8_t addr_type, const uint8_t *addr, int32_t duration_ms) {
DEBUG_printf("mp_bluetooth_gap_peripheral_connect\n");
uint16_t conn_scan_interval = 60000 / 625;
uint16_t conn_scan_window = 30000 / 625;
uint16_t conn_interval_min = 10000 / 1250;
uint16_t conn_interval_max = 30000 / 1250;
uint16_t conn_latency = 4;
uint16_t supervision_timeout = duration_ms / 10; // default = 720
uint16_t min_ce_length = 10000 / 625;
uint16_t max_ce_length = 30000 / 625;
gap_set_connection_parameters(conn_scan_interval, conn_scan_window, conn_interval_min, conn_interval_max, conn_latency, supervision_timeout, min_ce_length, max_ce_length);
bd_addr_t btstack_addr;
memcpy(btstack_addr, addr, BD_ADDR_LEN);
return btstack_error_to_errno(gap_connect(btstack_addr, addr_type));
}
#endif // MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
#if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
int mp_bluetooth_gattc_discover_primary_services(uint16_t conn_handle, const mp_obj_bluetooth_uuid_t *uuid) {
DEBUG_printf("mp_bluetooth_gattc_discover_primary_services\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
uint8_t err;
if (uuid) {
if (uuid->type == MP_BLUETOOTH_UUID_TYPE_16) {
err = gatt_client_discover_primary_services_by_uuid16(&btstack_packet_handler_discover_services, conn_handle, get_uuid16(uuid));
} else if (uuid->type == MP_BLUETOOTH_UUID_TYPE_128) {
uint8_t buffer[16];
reverse_128(uuid->data, buffer);
err = gatt_client_discover_primary_services_by_uuid128(&btstack_packet_handler_discover_services, conn_handle, buffer);
} else {
DEBUG_printf(" --> unknown UUID size\n");
return MP_EINVAL;
}
} else {
err = gatt_client_discover_primary_services(&btstack_packet_handler_discover_services, conn_handle);
}
return btstack_error_to_errno(err);
}
int mp_bluetooth_gattc_discover_characteristics(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle, const mp_obj_bluetooth_uuid_t *uuid) {
DEBUG_printf("mp_bluetooth_gattc_discover_characteristics\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
gatt_client_service_t service = {
// Only start/end handles needed for gatt_client_discover_characteristics_for_service.
.start_group_handle = start_handle,
.end_group_handle = end_handle,
.uuid16 = 0,
.uuid128 = {0},
};
uint8_t err;
if (uuid) {
if (uuid->type == MP_BLUETOOTH_UUID_TYPE_16) {
err = gatt_client_discover_characteristics_for_service_by_uuid16(&btstack_packet_handler_discover_characteristics, conn_handle, &service, get_uuid16(uuid));
} else if (uuid->type == MP_BLUETOOTH_UUID_TYPE_128) {
uint8_t buffer[16];
reverse_128(uuid->data, buffer);
err = gatt_client_discover_characteristics_for_service_by_uuid128(&btstack_packet_handler_discover_characteristics, conn_handle, &service, buffer);
} else {
DEBUG_printf(" --> unknown UUID size\n");
return MP_EINVAL;
}
} else {
err = gatt_client_discover_characteristics_for_service(&btstack_packet_handler_discover_characteristics, conn_handle, &service);
}
return btstack_error_to_errno(err);
}
int mp_bluetooth_gattc_discover_descriptors(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle) {
DEBUG_printf("mp_bluetooth_gattc_discover_descriptors\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
gatt_client_characteristic_t characteristic = {
// Only start/end handles needed for gatt_client_discover_characteristic_descriptors.
.start_handle = start_handle,
.value_handle = 0,
.end_handle = end_handle,
.properties = 0,
.uuid16 = 0,
.uuid128 = {0},
};
return btstack_error_to_errno(gatt_client_discover_characteristic_descriptors(&btstack_packet_handler_discover_descriptors, conn_handle, &characteristic));
}
int mp_bluetooth_gattc_read(uint16_t conn_handle, uint16_t value_handle) {
DEBUG_printf("mp_bluetooth_gattc_read\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
return btstack_error_to_errno(gatt_client_read_value_of_characteristic_using_value_handle(&btstack_packet_handler_read, conn_handle, value_handle));
}
int mp_bluetooth_gattc_write(uint16_t conn_handle, uint16_t value_handle, const uint8_t *value, size_t *value_len, unsigned int mode) {
DEBUG_printf("mp_bluetooth_gattc_write\n");
if (!mp_bluetooth_is_active()) {
return ERRNO_BLUETOOTH_NOT_ACTIVE;
}
// We should be distinguishing between gatt_client_write_value_of_characteristic vs
// gatt_client_write_characteristic_descriptor_using_descriptor_handle.
// However both are implemented using send_gatt_write_attribute_value_request under the hood,
// and we get the exact same event to the packet handler.
// Same story for the "without response" version.
int err;
mp_btstack_pending_op_t *pending_op = NULL;
if (mode == MP_BLUETOOTH_WRITE_MODE_NO_RESPONSE) {
// If possible, this will send immediately, copying the buffer directly to the ACL buffer.
err = gatt_client_write_value_of_characteristic_without_response(conn_handle, value_handle, *value_len, (uint8_t *)value);
if (err == GATT_CLIENT_BUSY) {
DEBUG_printf("mp_bluetooth_gattc_write: client busy\n");
// Can't send right now, need to take a copy of the buffer and add it to the queue.
pending_op = btstack_enqueue_pending_operation(MP_BLUETOOTH_BTSTACK_PENDING_WRITE_NO_RESPONSE, conn_handle, value_handle, value, *value_len);
// Notify when this conn_handle can write.
err = gatt_client_request_can_write_without_response_event(&btstack_packet_handler_generic, conn_handle);
} else {
DEBUG_printf("mp_bluetooth_gattc_write: other failure: %d\n", err);
}
} else if (mode == MP_BLUETOOTH_WRITE_MODE_WITH_RESPONSE) {
// Pending operation copies the value buffer and keeps a GC reference
// until the response comes back (there is always a response).
pending_op = btstack_enqueue_pending_operation(MP_BLUETOOTH_BTSTACK_PENDING_WRITE, conn_handle, value_handle, value, *value_len);
err = gatt_client_write_value_of_characteristic(&btstack_packet_handler_write_with_response, conn_handle, value_handle, pending_op->len, pending_op->buf);
} else {
return MP_EINVAL;
}
if (pending_op && err != ERROR_CODE_SUCCESS) {
// Failure. Unref and free the pending operation.
btstack_remove_pending_operation(pending_op, true /* del */);
}
return btstack_error_to_errno(err);
}
int mp_bluetooth_gattc_exchange_mtu(uint16_t conn_handle) {
DEBUG_printf("mp_bluetooth_exchange_mtu: conn_handle=%d mtu=%d\n", conn_handle, l2cap_max_le_mtu());
gatt_client_send_mtu_negotiation(&btstack_packet_handler_att_server, conn_handle);
return 0;
}
#endif // MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
#if MICROPY_PY_BLUETOOTH_ENABLE_L2CAP_CHANNELS
int mp_bluetooth_l2cap_listen(uint16_t psm, uint16_t mtu) {
DEBUG_printf("mp_bluetooth_l2cap_listen: psm=%d, mtu=%d\n", psm, mtu);
return MP_EOPNOTSUPP;
}
int mp_bluetooth_l2cap_connect(uint16_t conn_handle, uint16_t psm, uint16_t mtu) {
DEBUG_printf("mp_bluetooth_l2cap_connect: conn_handle=%d, psm=%d, mtu=%d\n", conn_handle, psm, mtu);
return MP_EOPNOTSUPP;
}
int mp_bluetooth_l2cap_disconnect(uint16_t conn_handle, uint16_t cid) {
DEBUG_printf("mp_bluetooth_l2cap_disconnect: conn_handle=%d, cid=%d\n", conn_handle, cid);
return MP_EOPNOTSUPP;
}
int mp_bluetooth_l2cap_send(uint16_t conn_handle, uint16_t cid, const uint8_t *buf, size_t len, bool *stalled) {
DEBUG_printf("mp_bluetooth_l2cap_send: conn_handle=%d, cid=%d, len=%d\n", conn_handle, cid, (int)len);
return MP_EOPNOTSUPP;
}
int mp_bluetooth_l2cap_recvinto(uint16_t conn_handle, uint16_t cid, uint8_t *buf, size_t *len) {
DEBUG_printf("mp_bluetooth_l2cap_recvinto: conn_handle=%d, cid=%d, len=%d\n", conn_handle, cid, (int)*len);
return MP_EOPNOTSUPP;
}
#endif // MICROPY_PY_BLUETOOTH_ENABLE_L2CAP_CHANNELS
#endif // MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK
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