292 lines
12 KiB
C
292 lines
12 KiB
C
/**
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* Copyright (c) 2023 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stdio.h>
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#include "btstack.h"
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#include "pico/cyw43_arch.h"
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#include "pico/stdlib.h"
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#if 0
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#define DEBUG_LOG(...) printf(__VA_ARGS__)
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#else
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#define DEBUG_LOG(...)
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#endif
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#define LED_QUICK_FLASH_DELAY_MS 100
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#define LED_SLOW_FLASH_DELAY_MS 1000
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typedef enum {
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TC_OFF,
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TC_IDLE,
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TC_W4_SCAN_RESULT,
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TC_W4_CONNECT,
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TC_W4_SERVICE_RESULT,
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TC_W4_CHARACTERISTIC_RESULT,
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TC_W4_ENABLE_NOTIFICATIONS_COMPLETE,
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TC_W4_READY
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} gc_state_t;
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static btstack_packet_callback_registration_t hci_event_callback_registration;
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static gc_state_t state = TC_OFF;
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static bd_addr_t server_addr;
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static bd_addr_type_t server_addr_type;
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static hci_con_handle_t connection_handle;
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static gatt_client_service_t server_service;
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static gatt_client_characteristic_t server_characteristic;
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static bool listener_registered;
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static gatt_client_notification_t notification_listener;
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static btstack_timer_source_t heartbeat;
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static void client_start(void){
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DEBUG_LOG("Start scanning!\n");
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state = TC_W4_SCAN_RESULT;
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gap_set_scan_parameters(0,0x0030, 0x0030);
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gap_start_scan();
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}
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static bool advertisement_report_contains_service(uint16_t service, uint8_t *advertisement_report){
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// get advertisement from report event
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const uint8_t * adv_data = gap_event_advertising_report_get_data(advertisement_report);
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uint8_t adv_len = gap_event_advertising_report_get_data_length(advertisement_report);
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// iterate over advertisement data
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ad_context_t context;
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for (ad_iterator_init(&context, adv_len, adv_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){
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uint8_t data_type = ad_iterator_get_data_type(&context);
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uint8_t data_size = ad_iterator_get_data_len(&context);
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const uint8_t * data = ad_iterator_get_data(&context);
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switch (data_type){
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case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS:
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for (int i = 0; i < data_size; i += 2) {
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uint16_t type = little_endian_read_16(data, i);
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if (type == service) return true;
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}
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default:
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break;
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}
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}
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return false;
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}
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static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
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UNUSED(packet_type);
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UNUSED(channel);
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UNUSED(size);
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uint8_t att_status;
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switch(state){
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case TC_W4_SERVICE_RESULT:
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switch(hci_event_packet_get_type(packet)) {
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case GATT_EVENT_SERVICE_QUERY_RESULT:
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// store service (we expect only one)
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DEBUG_LOG("Storing service\n");
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gatt_event_service_query_result_get_service(packet, &server_service);
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break;
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case GATT_EVENT_QUERY_COMPLETE:
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att_status = gatt_event_query_complete_get_att_status(packet);
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if (att_status != ATT_ERROR_SUCCESS){
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printf("SERVICE_QUERY_RESULT, ATT Error 0x%02x.\n", att_status);
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gap_disconnect(connection_handle);
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break;
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}
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// service query complete, look for characteristic
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state = TC_W4_CHARACTERISTIC_RESULT;
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DEBUG_LOG("Search for env sensing characteristic.\n");
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gatt_client_discover_characteristics_for_service_by_uuid16(handle_gatt_client_event, connection_handle, &server_service, ORG_BLUETOOTH_CHARACTERISTIC_TEMPERATURE);
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break;
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default:
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break;
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}
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break;
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case TC_W4_CHARACTERISTIC_RESULT:
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switch(hci_event_packet_get_type(packet)) {
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case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT:
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DEBUG_LOG("Storing characteristic\n");
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gatt_event_characteristic_query_result_get_characteristic(packet, &server_characteristic);
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break;
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case GATT_EVENT_QUERY_COMPLETE:
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att_status = gatt_event_query_complete_get_att_status(packet);
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if (att_status != ATT_ERROR_SUCCESS){
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printf("CHARACTERISTIC_QUERY_RESULT, ATT Error 0x%02x.\n", att_status);
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gap_disconnect(connection_handle);
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break;
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}
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// register handler for notifications
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listener_registered = true;
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gatt_client_listen_for_characteristic_value_updates(¬ification_listener, handle_gatt_client_event, connection_handle, &server_characteristic);
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// enable notifications
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DEBUG_LOG("Enable notify on characteristic.\n");
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state = TC_W4_ENABLE_NOTIFICATIONS_COMPLETE;
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gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle,
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&server_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION);
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break;
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default:
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break;
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}
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break;
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case TC_W4_ENABLE_NOTIFICATIONS_COMPLETE:
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switch(hci_event_packet_get_type(packet)) {
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case GATT_EVENT_QUERY_COMPLETE:
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DEBUG_LOG("Notifications enabled, ATT status 0x%02x\n", gatt_event_query_complete_get_att_status(packet));
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if (gatt_event_query_complete_get_att_status(packet) != ATT_ERROR_SUCCESS) break;
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state = TC_W4_READY;
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break;
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default:
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break;
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}
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break;
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case TC_W4_READY:
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switch(hci_event_packet_get_type(packet)) {
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case GATT_EVENT_NOTIFICATION: {
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uint16_t value_length = gatt_event_notification_get_value_length(packet);
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const uint8_t *value = gatt_event_notification_get_value(packet);
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DEBUG_LOG("Indication value len %d\n", value_length);
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if (value_length == 2) {
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float temp = little_endian_read_16(value, 0);
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printf("read temp %.2f degc\n", temp / 100);
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} else {
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printf("Unexpected length %d\n", value_length);
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}
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break;
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}
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default:
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printf("Unknown packet type 0x%02x\n", hci_event_packet_get_type(packet));
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break;
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}
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break;
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default:
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printf("error\n");
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break;
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}
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}
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static void hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
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UNUSED(size);
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UNUSED(channel);
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bd_addr_t local_addr;
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if (packet_type != HCI_EVENT_PACKET) return;
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uint8_t event_type = hci_event_packet_get_type(packet);
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switch(event_type){
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case BTSTACK_EVENT_STATE:
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if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING) {
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gap_local_bd_addr(local_addr);
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printf("BTstack up and running on %s.\n", bd_addr_to_str(local_addr));
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client_start();
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} else {
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state = TC_OFF;
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}
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break;
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case GAP_EVENT_ADVERTISING_REPORT:
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if (state != TC_W4_SCAN_RESULT) return;
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// check name in advertisement
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if (!advertisement_report_contains_service(ORG_BLUETOOTH_SERVICE_ENVIRONMENTAL_SENSING, packet)) return;
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// store address and type
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gap_event_advertising_report_get_address(packet, server_addr);
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server_addr_type = gap_event_advertising_report_get_address_type(packet);
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// stop scanning, and connect to the device
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state = TC_W4_CONNECT;
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gap_stop_scan();
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printf("Connecting to device with addr %s.\n", bd_addr_to_str(server_addr));
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gap_connect(server_addr, server_addr_type);
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break;
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case HCI_EVENT_LE_META:
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// wait for connection complete
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switch (hci_event_le_meta_get_subevent_code(packet)) {
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case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
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if (state != TC_W4_CONNECT) return;
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connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet);
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// initialize gatt client context with handle, and add it to the list of active clients
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// query primary services
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DEBUG_LOG("Search for env sensing service.\n");
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state = TC_W4_SERVICE_RESULT;
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gatt_client_discover_primary_services_by_uuid16(handle_gatt_client_event, connection_handle, ORG_BLUETOOTH_SERVICE_ENVIRONMENTAL_SENSING);
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break;
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default:
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break;
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}
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break;
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case HCI_EVENT_DISCONNECTION_COMPLETE:
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// unregister listener
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connection_handle = HCI_CON_HANDLE_INVALID;
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if (listener_registered){
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listener_registered = false;
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gatt_client_stop_listening_for_characteristic_value_updates(¬ification_listener);
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}
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printf("Disconnected %s\n", bd_addr_to_str(server_addr));
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if (state == TC_OFF) break;
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client_start();
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break;
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default:
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break;
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}
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}
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static void heartbeat_handler(struct btstack_timer_source *ts) {
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// Invert the led
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static bool quick_flash;
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static bool led_on = true;
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led_on = !led_on;
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cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, led_on);
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if (listener_registered && led_on) {
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quick_flash = !quick_flash;
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} else if (!listener_registered) {
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quick_flash = false;
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}
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// Restart timer
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btstack_run_loop_set_timer(ts, (led_on || quick_flash) ? LED_QUICK_FLASH_DELAY_MS : LED_SLOW_FLASH_DELAY_MS);
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btstack_run_loop_add_timer(ts);
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}
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int main() {
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stdio_init_all();
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// initialize CYW43 driver architecture (will enable BT if/because CYW43_ENABLE_BLUETOOTH == 1)
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if (cyw43_arch_init()) {
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printf("failed to initialise cyw43_arch\n");
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return -1;
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}
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l2cap_init();
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sm_init();
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sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT);
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// setup empty ATT server - only needed if LE Peripheral does ATT queries on its own, e.g. Android and iOS
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att_server_init(NULL, NULL, NULL);
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gatt_client_init();
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hci_event_callback_registration.callback = &hci_event_handler;
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hci_add_event_handler(&hci_event_callback_registration);
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// set one-shot btstack timer
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heartbeat.process = &heartbeat_handler;
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btstack_run_loop_set_timer(&heartbeat, LED_SLOW_FLASH_DELAY_MS);
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btstack_run_loop_add_timer(&heartbeat);
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// turn on!
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hci_power_control(HCI_POWER_ON);
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// btstack_run_loop_execute is only required when using the 'polling' method (e.g. using pico_cyw43_arch_poll library).
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// This example uses the 'threadsafe background` method, where BT work is handled in a low priority IRQ, so it
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// is fine to call bt_stack_run_loop_execute() but equally you can continue executing user code.
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#if 1 // this is only necessary when using polling (which we aren't, but we're showing it is still safe to call in this case)
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btstack_run_loop_execute();
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#else
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// this core is free to do it's own stuff except when using 'polling' method (in which case you should use
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// btstacK_run_loop_ methods to add work to the run loop.
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// this is a forever loop in place of where user code would go.
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while(true) {
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sleep_ms(1000);
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}
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#endif
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return 0;
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}
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