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extmod/btstack: Implement scan and gatt client, connect and disconnect.

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Work done in collaboration with Jim Mussared aka @jimmo.
This commit is contained in:
Damien George 2020-02-20 14:44:13 +11:00
parent 372e5a280e
commit 018ce122ca
1 changed files with 207 additions and 44 deletions
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237
extmod/btstack/modbluetooth_btstack.c
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@ -39,7 +39,7 @@
volatile int mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF; volatile int mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
static btstack_packet_callback_registration_t hci_event_callback_registration; STATIC btstack_packet_callback_registration_t hci_event_callback_registration;
STATIC int btstack_error_to_errno(int err) { STATIC int btstack_error_to_errno(int err) {
if (err == ERROR_CODE_SUCCESS) { if (err == ERROR_CODE_SUCCESS) {
@ -51,46 +51,146 @@ STATIC int btstack_error_to_errno(int err) {
} }
} }
STATIC void att_server_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { STATIC mp_obj_bluetooth_uuid_t create_mp_uuid(uint16_t uuid16, const uint8_t *uuid128) {
DEBUG_EVENT_printf("att_server_packet_handler: packet_type: %u, channel: %u, packet: %p, size: %u\n", packet_type, channel, packet, size); mp_obj_bluetooth_uuid_t result;
if (packet_type == HCI_EVENT_PACKET) { 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;
}
STATIC void btstack_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
DEBUG_EVENT_printf("btstack_packet_handler(packet_type=%u, channel=%u, packet=%p, size=%u)\n", packet_type, channel, packet, size);
if (packet_type != HCI_EVENT_PACKET) {
return;
}
uint8_t event_type = hci_event_packet_get_type(packet); uint8_t event_type = hci_event_packet_get_type(packet);
if (event_type == ATT_EVENT_CONNECTED) { if (event_type == ATT_EVENT_CONNECTED) {
DEBUG_EVENT_printf(" --> att connected\n"); DEBUG_EVENT_printf(" --> att connected\n");
uint16_t conn_handle = att_event_connected_get_handle(packet);
uint8_t addr_type = att_event_connected_get_address_type(packet);
bd_addr_t addr;
att_event_connected_get_address(packet, addr);
mp_bluetooth_gap_on_connected_disconnected(MP_BLUETOOTH_IRQ_CENTRAL_CONNECT, conn_handle, addr_type, addr);
} else if (event_type == ATT_EVENT_DISCONNECTED) { } else if (event_type == ATT_EVENT_DISCONNECTED) {
DEBUG_EVENT_printf(" --> att disconnected\n"); DEBUG_EVENT_printf(" --> att disconnected\n");
uint16_t conn_handle = att_event_disconnected_get_handle(packet);
bd_addr_t addr = {0};
mp_bluetooth_gap_on_connected_disconnected(MP_BLUETOOTH_IRQ_CENTRAL_DISCONNECT, conn_handle, 0, addr);
} else if (event_type == HCI_EVENT_LE_META) { } else if (event_type == HCI_EVENT_LE_META) {
DEBUG_EVENT_printf(" --> att le meta\n"); DEBUG_EVENT_printf(" --> hci le meta\n");
} else if (event_type == HCI_EVENT_DISCONNECTION_COMPLETE) { if (hci_event_le_meta_get_subevent_code(packet) == HCI_SUBEVENT_LE_CONNECTION_COMPLETE) {
DEBUG_EVENT_printf(" --> att disconnect complete\n"); 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 { } else {
DEBUG_EVENT_printf(" --> att type: unknown (%u)\n", event_type); // Slave role.
irq_event = MP_BLUETOOTH_IRQ_CENTRAL_CONNECT;
} }
mp_bluetooth_gap_on_connected_disconnected(irq_event, conn_handle, addr_type, addr);
}
} else if (event_type == BTSTACK_EVENT_STATE) {
DEBUG_EVENT_printf(" --> btstack event state 0x%02x\n", btstack_event_state_get_state(packet));
} else if (event_type == HCI_EVENT_TRANSPORT_PACKET_SENT) {
DEBUG_EVENT_printf(" --> hci transport packet set\n");
} else if (event_type == HCI_EVENT_COMMAND_COMPLETE) {
DEBUG_EVENT_printf(" --> hci command complete\n");
} else if (event_type == HCI_EVENT_COMMAND_STATUS) {
DEBUG_EVENT_printf(" --> hci command status\n");
} else if (event_type == HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS) {
DEBUG_EVENT_printf(" --> hci number of completed packets\n");
} else if (event_type == BTSTACK_EVENT_NR_CONNECTIONS_CHANGED) {
DEBUG_EVENT_printf(" --> btstack # conns changed\n");
} else if (event_type == HCI_EVENT_VENDOR_SPECIFIC) {
DEBUG_EVENT_printf(" --> hci vendor specific\n");
} else if (event_type == GAP_EVENT_ADVERTISING_REPORT) {
DEBUG_EVENT_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);
bool connectable = adv_event_type == 0 || adv_event_type == 1;
if (adv_event_type <= 2) {
mp_bluetooth_gap_on_scan_result(address_type, address, connectable, rssi, data, length);
} else if (adv_event_type == 4) {
// TODO: Scan response.
}
} else if (event_type == HCI_EVENT_DISCONNECTION_COMPLETE) {
DEBUG_EVENT_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);
} else if (event_type == GATT_EVENT_QUERY_COMPLETE) {
DEBUG_EVENT_printf(" --> gatt query complete\n");
} else if (event_type == GATT_EVENT_SERVICE_QUERY_RESULT) {
DEBUG_EVENT_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_EVENT_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_EVENT_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_EVENT_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);
MICROPY_PY_BLUETOOTH_ENTER
len = mp_bluetooth_gattc_on_data_available_start(MP_BLUETOOTH_IRQ_GATTC_READ_RESULT, conn_handle, value_handle, len);
mp_bluetooth_gattc_on_data_available_chunk(data, len);
mp_bluetooth_gattc_on_data_available_end();
MICROPY_PY_BLUETOOTH_EXIT
} else {
DEBUG_EVENT_printf(" --> hci event type: unknown (0x%02x)\n", event_type);
} }
} }
STATIC void hci_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { #if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
DEBUG_EVENT_printf("hci_packet_handler: packet_type: %u, channel: %u, packet: %p, size: %u\n", packet_type, channel, packet, size); STATIC void btstack_packet_handler_write_with_response(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
if (packet_type == HCI_EVENT_PACKET) { DEBUG_EVENT_printf("btstack_packet_handler_write_with_response(packet_type=%u, channel=%u, packet=%p, size=%u)\n", packet_type, channel, packet, size);
if (packet_type != HCI_EVENT_PACKET) {
return;
}
uint8_t event_type = hci_event_packet_get_type(packet); uint8_t event_type = hci_event_packet_get_type(packet);
if (event_type == HCI_EVENT_TRANSPORT_PACKET_SENT || event_type == HCI_EVENT_COMMAND_COMPLETE) { if (event_type == GATT_EVENT_QUERY_COMPLETE) {
} else if (event_type == BTSTACK_EVENT_NR_CONNECTIONS_CHANGED) { DEBUG_EVENT_printf(" --> gatt query complete\n");
DEBUG_EVENT_printf(" --> hci type: # conns changed\n"); uint16_t conn_handle = gatt_event_query_complete_get_handle(packet);
} else if (event_type == HCI_EVENT_VENDOR_SPECIFIC) { uint8_t status = gatt_event_query_complete_get_att_status(packet);
DEBUG_EVENT_printf(" --> hci type: vendor specific\n"); // TODO there is no value_handle to pass here
} else { mp_bluetooth_gattc_on_write_status(conn_handle, 0, status);
DEBUG_EVENT_printf(" --> hci type: unknown (%u)\n", event_type);
}
} }
} }
#endif
int mp_bluetooth_init(void) { int mp_bluetooth_init(void) {
DEBUG_EVENT_printf("mp_bluetooth_init\n"); DEBUG_EVENT_printf("mp_bluetooth_init\n");
@ -113,17 +213,18 @@ int mp_bluetooth_init(void) {
sm_set_er(dummy_key); sm_set_er(dummy_key);
sm_set_ir(dummy_key); sm_set_ir(dummy_key);
#if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
gatt_client_init();
#endif
mp_bluetooth_btstack_port_start(); mp_bluetooth_btstack_port_start();
mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_ACTIVE; mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_ACTIVE;
// Register for HCI events. // Register for HCI events.
memset(&hci_event_callback_registration, 0, sizeof(btstack_packet_callback_registration_t)); memset(&hci_event_callback_registration, 0, sizeof(btstack_packet_callback_registration_t));
hci_event_callback_registration.callback = &hci_packet_handler; hci_event_callback_registration.callback = &btstack_packet_handler;
hci_add_event_handler(&hci_event_callback_registration); hci_add_event_handler(&hci_event_callback_registration);
// Register for ATT event.
att_server_register_packet_handler(&att_server_packet_handler);
return 0; return 0;
} }
@ -358,44 +459,106 @@ int mp_bluetooth_gap_disconnect(uint16_t conn_handle) {
} }
#if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE #if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
STATIC btstack_timer_source_t scan_duration_timeout;
STATIC void hci_initialization_timeout_handler(btstack_timer_source_t *ds) {
mp_bluetooth_gap_scan_stop();
}
int mp_bluetooth_gap_scan_start(int32_t duration_ms, int32_t interval_us, int32_t window_us) { int mp_bluetooth_gap_scan_start(int32_t duration_ms, int32_t interval_us, int32_t window_us) {
DEBUG_EVENT_printf("mp_bluetooth_gap_scan_start\n"); DEBUG_EVENT_printf("mp_bluetooth_gap_scan_start\n");
btstack_run_loop_set_timer(&scan_duration_timeout, duration_ms);
btstack_run_loop_set_timer_handler(&scan_duration_timeout, hci_initialization_timeout_handler);
btstack_run_loop_add_timer(&scan_duration_timeout);
// 0 = passive scan (we don't handle scan response).
gap_set_scan_parameters(0, interval_us / 625, window_us / 625);
gap_start_scan();
return 0; return 0;
} }
int mp_bluetooth_gap_scan_stop(void) { int mp_bluetooth_gap_scan_stop(void) {
DEBUG_EVENT_printf("mp_bluetooth_gap_scan_stop\n"); DEBUG_EVENT_printf("mp_bluetooth_gap_scan_stop\n");
btstack_run_loop_remove_timer(&scan_duration_timeout);
gap_stop_scan();
mp_bluetooth_gap_on_scan_complete();
return 0; return 0;
} }
int mp_bluetooth_gap_peripheral_connect(uint8_t addr_type, const uint8_t *addr, int32_t duration_ms) { int mp_bluetooth_gap_peripheral_connect(uint8_t addr_type, const uint8_t *addr, int32_t duration_ms) {
DEBUG_EVENT_printf("mp_bluetooth_gap_peripheral_connect\n"); DEBUG_EVENT_printf("mp_bluetooth_gap_peripheral_connect\n");
return 0;
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));
} }
int mp_bluetooth_gattc_discover_primary_services(uint16_t conn_handle) { int mp_bluetooth_gattc_discover_primary_services(uint16_t conn_handle) {
DEBUG_EVENT_printf("mp_bluetooth_gattc_discover_primary_services\n"); DEBUG_EVENT_printf("mp_bluetooth_gattc_discover_primary_services\n");
return 0; return btstack_error_to_errno(gatt_client_discover_primary_services(&btstack_packet_handler, conn_handle));
} }
int mp_bluetooth_gattc_discover_characteristics(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle) { int mp_bluetooth_gattc_discover_characteristics(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle) {
DEBUG_EVENT_printf("mp_bluetooth_gattc_discover_characteristics\n"); DEBUG_EVENT_printf("mp_bluetooth_gattc_discover_characteristics\n");
return 0;
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},
};
return btstack_error_to_errno(gatt_client_discover_characteristics_for_service(&btstack_packet_handler, conn_handle, &service));
} }
int mp_bluetooth_gattc_discover_descriptors(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle) { int mp_bluetooth_gattc_discover_descriptors(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle) {
DEBUG_EVENT_printf("mp_bluetooth_gattc_discover_descriptors\n"); DEBUG_EVENT_printf("mp_bluetooth_gattc_discover_descriptors\n");
return 0; 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, conn_handle, &characteristic));
} }
int mp_bluetooth_gattc_read(uint16_t conn_handle, uint16_t value_handle) { int mp_bluetooth_gattc_read(uint16_t conn_handle, uint16_t value_handle) {
DEBUG_EVENT_printf("mp_bluetooth_gattc_read\n"); DEBUG_EVENT_printf("mp_bluetooth_gattc_read\n");
return 0; return btstack_error_to_errno(gatt_client_read_value_of_characteristic_using_value_handle(&btstack_packet_handler, 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) { 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_EVENT_printf("mp_bluetooth_gattc_write\n"); DEBUG_EVENT_printf("mp_bluetooth_gattc_write\n");
return 0;
// TODO the below gatt_client functions do not copy the data and require it to be valid
// until the write is done, so there should be some kind of buffering done here.
if (mode == MP_BLUETOOTH_WRITE_MODE_NO_RESPONSE) {
// TODO need to call gatt_client_request_can_write_without_response_event then do
// the actual write on the callback from that.
return btstack_error_to_errno(gatt_client_write_value_of_characteristic_without_response(conn_handle, value_handle, *value_len, (uint8_t *)value));
}
if (mode == MP_BLUETOOTH_WRITE_MODE_WITH_RESPONSE) {
return btstack_error_to_errno(gatt_client_write_value_of_characteristic(&btstack_packet_handler_write_with_response, conn_handle, value_handle, *value_len, (uint8_t *)value));
}
return MP_EINVAL;
} }
#endif #endif