/* * 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_EVENT_printf(...) // printf(__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; STATIC int btstack_error_to_errno(int err) { DEBUG_EVENT_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; 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 // 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_EVENT_printf("btstack_notify_indicate_ready_handler op_type=%d conn_handle=%d value_handle=%d len=%lu\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_EVENT_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_EVENT_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_EVENT_printf("btstack_enqueue_pending_operation op_type=%d conn_handle=%d value_handle=%d len=%lu\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_CENTRAL_MODE // 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_EVENT_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_EVENT_printf("btstack_finish_pending_operation: found value_handle=%d len=%lu\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_EVENT_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_EVENT_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_EVENT_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_EVENT_printf(" --> att disconnected\n"); } else if (event_type == ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE) { DEBUG_EVENT_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 == HCI_EVENT_LE_META || event_type == HCI_EVENT_DISCONNECTION_COMPLETE) { // Ignore, duplicated by att_server.c. } else { DEBUG_EVENT_printf(" --> hci att server event type: unknown (0x%02x)\n", event_type); } } STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t irq) { DEBUG_EVENT_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_EVENT_printf(" --> hci le meta\n"); if (hci_event_le_meta_get_subevent_code(packet) == 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); } } else if (event_type == BTSTACK_EVENT_STATE) { uint8_t state = btstack_event_state_get_state(packet); DEBUG_EVENT_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_OFF) { // Signal that de-initialisation has completed. mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF; } } else if (event_type == HCI_EVENT_TRANSPORT_PACKET_SENT) { DEBUG_EVENT_printf(" --> hci transport packet sent\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 == GATT_EVENT_MTU) { DEBUG_EVENT_printf(" --> hci MTU\n"); } 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); #if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE } 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); mp_bluetooth_gap_on_scan_result(address_type, address, adv_event_type, rssi, data, length); } 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_EVENT_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_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); mp_uint_t atomic_state; len = mp_bluetooth_gattc_on_data_available_start(MP_BLUETOOTH_IRQ_GATTC_READ_RESULT, conn_handle, value_handle, len, &atomic_state); mp_bluetooth_gattc_on_data_available_chunk(data, len); mp_bluetooth_gattc_on_data_available_end(atomic_state); } else if (event_type == GATT_EVENT_NOTIFICATION) { DEBUG_EVENT_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_uint_t atomic_state; len = mp_bluetooth_gattc_on_data_available_start(MP_BLUETOOTH_IRQ_GATTC_NOTIFY, conn_handle, value_handle, len, &atomic_state); mp_bluetooth_gattc_on_data_available_chunk(data, len); mp_bluetooth_gattc_on_data_available_end(atomic_state); } else if (event_type == GATT_EVENT_INDICATION) { DEBUG_EVENT_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_uint_t atomic_state; len = mp_bluetooth_gattc_on_data_available_start(MP_BLUETOOTH_IRQ_GATTC_INDICATE, conn_handle, value_handle, len, &atomic_state); mp_bluetooth_gattc_on_data_available_chunk(data, len); mp_bluetooth_gattc_on_data_available_end(atomic_state); } else if (event_type == GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE) { uint16_t conn_handle = gatt_event_can_write_without_response_get_handle(packet); DEBUG_EVENT_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_EVENT_printf(" --> ready for value_handle=%d len=%lu\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_CENTRAL_MODE } else { DEBUG_EVENT_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_CENTRAL_MODE // 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_CENTRAL_MODE 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; } int mp_bluetooth_init(void) { DEBUG_EVENT_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(); 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_CENTRAL_MODE gatt_client_init(); #endif // 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); // 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) { // 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 MP_ETIMEDOUT; } #if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE // 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 return 0; } void mp_bluetooth_deinit(void) { DEBUG_EVENT_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_CENTRAL_MODE // Remove our registration for notify/indicate. gatt_client_stop_listening_for_characteristic_value_updates(&MP_STATE_PORT(bluetooth_btstack_root_pointers)->notification); #endif // 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; } bool mp_bluetooth_is_active(void) { return mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_ACTIVE; } void mp_bluetooth_get_device_addr(uint8_t *addr) { mp_hal_get_mac(MP_HAL_MAC_BDADDR, addr); } 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_EVENT_printf("mp_bluetooth_gap_advertise_start\n"); 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_EVENT_printf("mp_bluetooth_gap_advertise_stop\n"); 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_EVENT_printf("mp_bluetooth_gatts_register_service_begin\n"); 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) { (void)connection_handle; DEBUG_EVENT_printf("btstack: 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_EVENT_printf("btstack: att_read_callback handle not found\n"); return 0; // TODO: Find status code for not-found. } return att_read_callback_handle_blob(entry->data, entry->data_len, offset, buffer, buffer_size); } 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_EVENT_printf("btstack: 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_EVENT_printf("btstack: 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]; } int mp_bluetooth_gatts_register_service(mp_obj_bluetooth_uuid_t *service_uuid, mp_obj_bluetooth_uuid_t **characteristic_uuids, uint8_t *characteristic_flags, mp_obj_bluetooth_uuid_t **descriptor_uuids, uint8_t *descriptor_flags, uint8_t *num_descriptors, uint16_t *handles, size_t num_characteristics) { DEBUG_EVENT_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] | ATT_PROPERTY_DYNAMIC; uint16_t read_permission = ATT_SECURITY_NONE; uint16_t write_permission = ATT_SECURITY_NONE; 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_EVENT_printf("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] | ATT_PROPERTY_DYNAMIC; read_permission = ATT_SECURITY_NONE; write_permission = ATT_SECURITY_NONE; 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_EVENT_printf("Registered desc with handle %u\n", handles[handle_index]); ++descriptor_index; ++handle_index; } } return 0; } int mp_bluetooth_gatts_register_service_end(void) { DEBUG_EVENT_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_EVENT_printf("mp_bluetooth_gatts_read\n"); 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_EVENT_printf("mp_bluetooth_gatts_write\n"); 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_EVENT_printf("mp_bluetooth_gatts_notify\n"); // 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_EVENT_printf("mp_bluetooth_gatts_notify_send\n"); // 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_EVENT_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_EVENT_printf("mp_bluetooth_gatts_indicate\n"); 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_EVENT_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_EVENT_printf("mp_bluetooth_gatts_set_buffer\n"); return mp_bluetooth_gatts_db_resize(MP_STATE_PORT(bluetooth_btstack_root_pointers)->gatts_db, value_handle, len, append); } int mp_bluetooth_gap_disconnect(uint16_t conn_handle) { DEBUG_EVENT_printf("mp_bluetooth_gap_disconnect\n"); gap_disconnect(conn_handle); return 0; } #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) { (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) { 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; } int mp_bluetooth_gap_scan_stop(void) { 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; } 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"); 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, const mp_obj_bluetooth_uuid_t *uuid) { DEBUG_EVENT_printf("mp_bluetooth_gattc_discover_primary_services\n"); 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_EVENT_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_EVENT_printf("mp_bluetooth_gattc_discover_characteristics\n"); 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_EVENT_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_EVENT_printf("mp_bluetooth_gattc_discover_descriptors\n"); 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_EVENT_printf("mp_bluetooth_gattc_read\n"); 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_EVENT_printf("mp_bluetooth_gattc_write\n"); // 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_EVENT_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_EVENT_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); } #endif // MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE #endif // MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK