btstack/example/gatt_device_information_query.c

/*
 * Copyright (C) 2014 BlueKitchen GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 * 4. Any redistribution, use, or modification is done solely for
 *    personal benefit and not for any commercial purpose or for
 *    monetary gain.
 *
 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Please inquire about commercial licensing options at 
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 */

#define BTSTACK_FILE__ "gatt_device_information_query.c"

// *****************************************************************************
/* EXAMPLE_START(gatt_device_information_query): GATT Device Information Service Client
 *
 * @text This example demonstrates how to use the GATT Device Information Service client to 
 * receive device information such as various IDs and revisions. The example scans 
 * for remote devices and connects to the first found device. If the remote device provides a Device
 * Information Service, the information is collected and printed in console output, otherwise, 
 * the device will be blacklisted and the scan restarted.
 */
// *****************************************************************************

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "btstack.h"

// gatt_device_information_query.gatt contains the declaration of the provided GATT Services + Characteristics
// gatt_device_information_query.h    contains the binary representation of gatt_device_information_query.gatt
// it is generated by the build system by calling: $BTSTACK_ROOT/tool/compile_gatt.py gatt_device_information_query.gatt gatt_device_information_query.h
// it needs to be regenerated when the GATT Database declared in gatt_device_information_query.gatt file is modified
#include "gatt_device_information_query.h"

typedef struct advertising_report {
    uint8_t   type;
    uint8_t   event_type;
    uint8_t   address_type;
    bd_addr_t address;
    uint8_t   rssi;
    uint8_t   length;
    const uint8_t * data;
} advertising_report_t;

static enum {
    APP_STATE_IDLE,
    APP_STATE_W4_SCAN_RESULT,
    APP_STATE_W4_CONNECT,
    APP_STATE_CONNECTED
} app_state;

static int blacklist_index = 0;
static bd_addr_t blacklist[20];
static advertising_report_t report;

static hci_con_handle_t connection_handle;

static bd_addr_t cmdline_addr;
static int cmdline_addr_found = 0;

static btstack_packet_callback_registration_t hci_event_callback_registration;

/* @section Main Application Setup
 *
 * @text The Listing MainConfiguration shows how to setup Device Information Service client. 
 * Besides calling init() method for each service, you'll also need to register HCI packet handler 
 * to handle advertisements, as well as connect and disconect events.
 *
 * @text Handling of GATT Device Information Service events will be later delegated to a sepparate packet 
 * handler, i.e. gatt_client_event_handler.
 *
 * @note There are two additional files associated with this client to allow a remote device to query out GATT database:
 * - gatt_device_information_query.gatt - contains the declaration of the provided GATT Services and Characteristics.
 * - gatt_device_information_query.h    - contains the binary representation of gatt_device_information_query.gatt. 
 * 
 * gatt_device_information_query.h is generated by the build system by calling: 
 * $BTSTACK_ROOT/tool/compile_gatt.py gatt_device_information_query.gatt gatt_device_information_query.h
 * This file needs to be regenerated when the GATT Database declared in gatt_device_information_query.gatt file is modified.
 */

/* LISTING_START(MainConfiguration): Setup Device Information Service Client service */
static void hci_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static void gatt_client_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);

static void device_information_service_client_setup(void){
    // Init L2CAP
    l2cap_init();

    // Setup ATT server - only needed if LE Peripheral does ATT queries on its own, e.g. Android phones
    att_server_init(profile_data, NULL, NULL);    

    // GATT Client setup
    gatt_client_init();
    // Device Information Service Client setup
    device_information_service_client_init();

    sm_init();
    sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT);

    hci_event_callback_registration.callback = &hci_packet_handler;
    hci_add_event_handler(&hci_event_callback_registration);
}
/* LISTING_END */

static int blacklist_size(void){
    return sizeof(blacklist) / sizeof(bd_addr_t);
}

static int blacklist_contains(bd_addr_t addr){
    int i;
    for (i=0; i<blacklist_size(); i++){
        if (bd_addr_cmp(addr, blacklist[i]) == 0) return 1;
    }
    return 0;
}

static void add_to_blacklist(bd_addr_t addr){
    printf("%s added to blacklist (no device information service found).\n", bd_addr_to_str(addr));
    bd_addr_copy(blacklist[blacklist_index], addr);
    blacklist_index = (blacklist_index + 1) % blacklist_size();
}

static void dump_advertising_report(uint8_t *packet){
    bd_addr_t address;
    gap_event_advertising_report_get_address(packet, address);

    printf("    * adv. event: evt-type %u, addr-type %u, addr %s, rssi %u, length adv %u, data: ", 
        gap_event_advertising_report_get_advertising_event_type(packet),
        gap_event_advertising_report_get_address_type(packet), 
        bd_addr_to_str(address), 
        gap_event_advertising_report_get_rssi(packet), 
        gap_event_advertising_report_get_data_length(packet));
    printf_hexdump(gap_event_advertising_report_get_data(packet), gap_event_advertising_report_get_data_length(packet));
    
}

/* LISTING_START(packetHandler): Packet Handler */
static void hci_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    /* LISTING_PAUSE */
    UNUSED(channel);
    UNUSED(size);

    uint8_t status;
    bd_addr_t address;

    if (packet_type != HCI_EVENT_PACKET){
        return;  
    } 

    switch (hci_event_packet_get_type(packet)) {
        case BTSTACK_EVENT_STATE:
            // BTstack activated, get started
            if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) break;
            if (cmdline_addr_found){
                printf("Connect to %s\n", bd_addr_to_str(cmdline_addr));
                app_state = APP_STATE_W4_CONNECT;
                gap_connect(cmdline_addr, 0);
                break;
            }
            printf("Start scanning!\n");
            app_state = APP_STATE_W4_SCAN_RESULT;
            gap_set_scan_parameters(0,0x0030, 0x0030);
            gap_start_scan();
            break;

        case GAP_EVENT_ADVERTISING_REPORT:
            if (app_state != APP_STATE_W4_SCAN_RESULT) return;

            gap_event_advertising_report_get_address(packet, address);
            if (blacklist_contains(address)) {
                break;
            }
            dump_advertising_report(packet);

            // stop scanning, and connect to the device
            app_state = APP_STATE_W4_CONNECT;
            gap_stop_scan();
            printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(report.address));
            gap_connect(report.address,report.address_type);
            break;

        /* LISTING_RESUME */
        case HCI_EVENT_LE_META:
            // wait for connection complete
            if (hci_event_le_meta_get_subevent_code(packet) !=  HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break;
            
            /* LISTING_PAUSE */
            if (app_state != APP_STATE_W4_CONNECT) return;
            
            /* LISTING_RESUME */
            // get connection handle from event
            connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet);
            
            // Connect to remote Device Information Service. The client will query the remote service and emit events,
            // that will be passed on to gatt_client_event_handler.
            status = device_information_service_client_query(connection_handle, gatt_client_event_handler);
            btstack_assert(status == ERROR_CODE_SUCCESS);
            
            printf("Device Information connected.\n");
            
            app_state = APP_STATE_CONNECTED;
            break;
            /* LISTING_PAUSE */
        
        case HCI_EVENT_DISCONNECTION_COMPLETE:
            connection_handle = HCI_CON_HANDLE_INVALID;
            
            if (cmdline_addr_found){
                printf("Disconnected %s\n", bd_addr_to_str(cmdline_addr));
                return;
            }

            printf("Disconnected %s\n", bd_addr_to_str(report.address));
            printf("Restart scan.\n");
            app_state = APP_STATE_W4_SCAN_RESULT;
            gap_start_scan();
            break;
        default:
            break;
    }
}
/* LISTING_END */


/* LISTING_START(gatt_client_event_handler): GATT Client Event Handler */
// The gatt_client_event_handler receives following events from remote device:
//  - GATTSERVICE_SUBEVENT_BATTERY_SERVICE_CONNECTED
//  - GATTSERVICE_SUBEVENT_BATTERY_SERVICE_LEVEL     
// 
//  Event GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_DONE is received when all queries are done, 
//  of if service was not found. The status field of this event indicated ATT errors (see bluetooth.h). 

static void gatt_client_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    /* LISTING_PAUSE */
    UNUSED(packet_type);
    UNUSED(channel);
    UNUSED(size);

    /* LISTING_RESUME */
    uint8_t att_status = 0;

    if (hci_event_packet_get_type(packet) != HCI_EVENT_GATTSERVICE_META){
        return;
    }
    
    switch (hci_event_gattservice_meta_get_subevent_code(packet)){
        case GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_MANUFACTURER_NAME:
            att_status = gattservice_subevent_device_information_manufacturer_name_get_att_status(packet);
            if (att_status != ATT_ERROR_SUCCESS){
                printf("Manufacturer Name read failed, ATT Error 0x%02x\n", att_status);
            } else {
                printf("Manufacturer Name: %s\n", gattservice_subevent_device_information_manufacturer_name_get_value(packet));
            }
            break;

        // ...
        /* LISTING_PAUSE */

        case GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_MODEL_NUMBER:
            att_status = gattservice_subevent_device_information_model_number_get_att_status(packet);
            if (att_status != ATT_ERROR_SUCCESS){
                printf("Model Number read failed, ATT Error 0x%02x\n", att_status);
            } else {
                printf("Model Number:     %s\n", gattservice_subevent_device_information_model_number_get_value(packet));
            }
            break;
        
        case GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_SERIAL_NUMBER:
            att_status = gattservice_subevent_device_information_serial_number_get_att_status(packet);
            if (att_status != ATT_ERROR_SUCCESS){
                printf("Serial Number read failed, ATT Error 0x%02x\n", att_status);
            } else {
                printf("Serial Number:    %s\n", gattservice_subevent_device_information_serial_number_get_value(packet));
            }
            break;

        case GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_HARDWARE_REVISION:
            att_status = gattservice_subevent_device_information_hardware_revision_get_att_status(packet);
            if (att_status != ATT_ERROR_SUCCESS){
                printf("Hardware Revision read failed, ATT Error 0x%02x\n", att_status);
            } else {
                printf("Hardware Revision: %s\n", gattservice_subevent_device_information_hardware_revision_get_value(packet));
            }
            break;
        
        case GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_FIRMWARE_REVISION:
            att_status = gattservice_subevent_device_information_firmware_revision_get_att_status(packet);
            if (att_status != ATT_ERROR_SUCCESS){
                printf("Firmware Revision read failed, ATT Error 0x%02x\n", att_status);
            } else {
                printf("Firmware Revision: %s\n", gattservice_subevent_device_information_firmware_revision_get_value(packet));
            }
            break;
        
        case GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_SOFTWARE_REVISION:
            att_status = gattservice_subevent_device_information_software_revision_get_att_status(packet);
            if (att_status != ATT_ERROR_SUCCESS){
                printf("Software Revision read failed, ATT Error 0x%02x\n", att_status);
            } else {
                printf("Software Revision: %s\n", gattservice_subevent_device_information_software_revision_get_value(packet));
            }
            break;

        case GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_SYSTEM_ID:
            att_status = gattservice_subevent_device_information_system_id_get_att_status(packet);
            if (att_status != ATT_ERROR_SUCCESS){
                printf("System ID read failed, ATT Error 0x%02x\n", att_status);
            } else {
                uint32_t manufacturer_identifier_low  = gattservice_subevent_device_information_system_id_get_manufacturer_id_low(packet);
                uint8_t  manufacturer_identifier_high = gattservice_subevent_device_information_system_id_get_manufacturer_id_high(packet);

                printf("Manufacturer ID:  0x%02x%08x\n",  manufacturer_identifier_high, manufacturer_identifier_low);   
                printf("Organizationally Unique ID:  0x%06x\n", gattservice_subevent_device_information_system_id_get_organizationally_unique_id(packet));           
            }
            break;
        
        case GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_IEEE_REGULATORY_CERTIFICATION:
            att_status = gattservice_subevent_device_information_ieee_regulatory_certification_get_att_status(packet);
            if (att_status != ATT_ERROR_SUCCESS){
                printf("IEEE Regulatory Certification read failed, ATT Error 0x%02x\n", att_status);
            } else {
                printf("value_a:          0x%04x\n", gattservice_subevent_device_information_ieee_regulatory_certification_get_value_a(packet)); 
                printf("value_b:          0x%04x\n", gattservice_subevent_device_information_ieee_regulatory_certification_get_value_b(packet)); 
            }
            break;
        
        case GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_PNP_ID:
            att_status = gattservice_subevent_device_information_pnp_id_get_att_status(packet);
            if (att_status != ATT_ERROR_SUCCESS){
                printf("PNP ID read failed, ATT Error 0x%02x\n", att_status);
            } else {
                printf("Vendor Source ID: 0x%02x\n", gattservice_subevent_device_information_pnp_id_get_vendor_source_id(packet)); 
                printf("Vendor  ID:       0x%04x\n", gattservice_subevent_device_information_pnp_id_get_vendor_id(packet)); 
                printf("Product ID:       0x%04x\n", gattservice_subevent_device_information_pnp_id_get_product_id(packet)); 
                printf("Product Version:  0x%04x\n", gattservice_subevent_device_information_pnp_id_get_product_version(packet)); 
            }
            break;
        
        /* LISTING_RESUME */
        case GATTSERVICE_SUBEVENT_DEVICE_INFORMATION_DONE:
            att_status = gattservice_subevent_device_information_serial_number_get_att_status(packet);
            switch (att_status){
                case ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE:
                    printf("Device Information service client not found.\n");
                    add_to_blacklist(report.address);
                    gap_disconnect(connection_handle);
                    break;
                case ATT_ERROR_SUCCESS:
                    printf("Query done\n");
                    break;
                default:
                    printf("Query failed, ATT Error 0x%02x\n", att_status);
                    break;

            }
            if (att_status != ATT_ERROR_SUCCESS){
                if (att_status == ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE)
                printf("Query failed, ATT Error 0x%02x\n", att_status);
            } else {
                printf("Query done\n");
            }
            break;
        default:
            break;
    }
}
 /* LISTING_END */

int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){

    // parse address if command line arguments are provided
    int arg = 1;
    cmdline_addr_found = 0;
    
    while (arg < argc) {
        if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){
            arg++;
            cmdline_addr_found = sscanf_bd_addr(argv[arg], cmdline_addr);
            arg++;
            if (!cmdline_addr_found) exit(1);
            continue;
        }
        fprintf(stderr, "\nUsage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", argv[0]);
        fprintf(stderr, "If no argument is provided, GATT browser will start scanning and connect to the first found device.\nTo connect to a specific device use argument [-a].\n\n");
        return 0;
    }
    (void)argv;

    device_information_service_client_setup();

    app_state = APP_STATE_IDLE;

    // turn on!
    hci_power_control(HCI_POWER_ON);

    return 0;
}

/* EXAMPLE_END */