flipperzero-firmware/firmware/targets/f7/ble-glue/gap.c

#include "gap.h"

#include "app_entry.h"
#include "ble.h"

#include "cmsis_os.h"
#include "otp.h"
#include "dev_info_service.h"
#include "battery_service.h"
#include "serial_service.h"

#include <applications/bt/bt_service/bt.h>
#include <furi-hal.h>

#define GAP_TAG "BLE"

#define FAST_ADV_TIMEOUT 30000
#define INITIAL_ADV_TIMEOUT 60000

#define BD_ADDR_SIZE_LOCAL 6

typedef struct {
  uint16_t gap_svc_handle;
  uint16_t dev_name_char_handle;
  uint16_t appearance_char_handle;
  uint16_t connection_handle;
  uint8_t adv_svc_uuid_len;
  uint8_t adv_svc_uuid[20];
} GapSvc;

typedef struct {
  GapSvc gap_svc;
  GapState state;
  uint8_t mac_address[BD_ADDR_SIZE_LOCAL];
  Bt* bt;
  osTimerId advertise_timer;
  osThreadAttr_t thread_attr;
  osThreadId_t thread_id;
} Gap;

// Identity root key
static const uint8_t gap_irk[16] = {0x12,0x34,0x56,0x78,0x9a,0xbc,0xde,0xf0,0x12,0x34,0x56,0x78,0x9a,0xbc,0xde,0xf0};
// Encryption root key
static const uint8_t gap_erk[16] = {0xfe,0xdc,0xba,0x09,0x87,0x65,0x43,0x21,0xfe,0xdc,0xba,0x09,0x87,0x65,0x43,0x21};
// Appearence characteristic UUID
static const uint8_t gap_appearence_char_uuid[] = {0x00, 0x86};
// Default MAC address
static const uint8_t gap_default_mac_addr[] = {0x6c, 0x7a, 0xd8, 0xac, 0x57, 0x72};

static Gap* gap = NULL;

static void gap_advertise(GapState new_state);
static void gap_app(void *arg);

SVCCTL_UserEvtFlowStatus_t SVCCTL_App_Notification( void *pckt )
{
  hci_event_pckt *event_pckt;
  evt_le_meta_event *meta_evt;
  evt_blue_aci *blue_evt;
  hci_le_phy_update_complete_event_rp0 *evt_le_phy_update_complete;
  uint8_t tx_phy;
  uint8_t rx_phy;
  tBleStatus ret = BLE_STATUS_INVALID_PARAMS;

  event_pckt = (hci_event_pckt*) ((hci_uart_pckt *) pckt)->data;

  switch (event_pckt->evt) {
    case EVT_DISCONN_COMPLETE:
    {
        hci_disconnection_complete_event_rp0 *disconnection_complete_event = (hci_disconnection_complete_event_rp0 *) event_pckt->data;
        if (disconnection_complete_event->Connection_Handle == gap->gap_svc.connection_handle) {
            gap->gap_svc.connection_handle = 0;
            gap->state = GapStateIdle;
            FURI_LOG_I(GAP_TAG, "Disconnect from client");
        }
        // Restart advertising
        gap_advertise(GapStateAdvFast);
        furi_hal_power_insomnia_exit();
    }
    break;

    case EVT_LE_META_EVENT:
        meta_evt = (evt_le_meta_event*) event_pckt->data;
        switch (meta_evt->subevent) {
            case EVT_LE_CONN_UPDATE_COMPLETE:
            FURI_LOG_D(GAP_TAG, "Connection update event");
            break;

            case EVT_LE_PHY_UPDATE_COMPLETE:
            evt_le_phy_update_complete = (hci_le_phy_update_complete_event_rp0*)meta_evt->data;
            if(evt_le_phy_update_complete->Status) {
                FURI_LOG_E(GAP_TAG, "Update PHY failed, status %d", evt_le_phy_update_complete->Status);
            } else {
                FURI_LOG_I(GAP_TAG, "Update PHY succeed");
            }
            ret = hci_le_read_phy(gap->gap_svc.connection_handle,&tx_phy,&rx_phy);
            if(ret) {
                FURI_LOG_E(GAP_TAG, "Read PHY failed, status: %d", ret);
            } else {
                FURI_LOG_I(GAP_TAG, "PHY Params TX= %d, RX= %d ", tx_phy, rx_phy);
            }
            break;

            case EVT_LE_CONN_COMPLETE:
            furi_hal_power_insomnia_enter();
            hci_le_connection_complete_event_rp0* connection_complete_event = (hci_le_connection_complete_event_rp0 *) meta_evt->data;
            FURI_LOG_I(GAP_TAG, "Connection complete for connection handle 0x%x", connection_complete_event->Connection_Handle);

            // Stop advertising as connection completed
            osTimerStop(gap->advertise_timer);

            // Update connection status and handle
            gap->state = GapStateConnected;
            gap->gap_svc.connection_handle = connection_complete_event->Connection_Handle;

            // Start pairing by sending security request
            aci_gap_slave_security_req(connection_complete_event->Connection_Handle);
            break;

            default:
            break;
        }
    break;

    case EVT_VENDOR:
        blue_evt = (evt_blue_aci*) event_pckt->data;
        switch (blue_evt->ecode) {
            aci_gap_pairing_complete_event_rp0 *pairing_complete;

        case EVT_BLUE_GAP_LIMITED_DISCOVERABLE:
            FURI_LOG_I(GAP_TAG, "Limited discoverable event");
            break;

        case EVT_BLUE_GAP_PASS_KEY_REQUEST:
        {
            // Generate random PIN code
            uint32_t pin = rand() % 999999;
            aci_gap_pass_key_resp(gap->gap_svc.connection_handle, pin);
            FURI_LOG_I(GAP_TAG, "Pass key request event. Pin: %d", pin);
            bt_pin_code_show(gap->bt, pin);
        }
            break;

        case EVT_BLUE_GAP_AUTHORIZATION_REQUEST:
            FURI_LOG_I(GAP_TAG, "Authorization request event");
            break;

        case EVT_BLUE_GAP_SLAVE_SECURITY_INITIATED:
            FURI_LOG_I(GAP_TAG, "Slave security initiated");
            break;

        case EVT_BLUE_GAP_BOND_LOST:
            FURI_LOG_I(GAP_TAG, "Bond lost event. Start rebonding");
            aci_gap_allow_rebond(gap->gap_svc.connection_handle);
            break;

        case EVT_BLUE_GAP_DEVICE_FOUND:
            FURI_LOG_I(GAP_TAG, "Device found event");
            break;

        case EVT_BLUE_GAP_ADDR_NOT_RESOLVED:
            FURI_LOG_I(GAP_TAG, "Address not resolved event");
            break;

        case EVT_BLUE_GAP_KEYPRESS_NOTIFICATION:
            FURI_LOG_I(GAP_TAG, "Key press notification event");
            break;

        case EVT_BLUE_GAP_NUMERIC_COMPARISON_VALUE:
            FURI_LOG_I(GAP_TAG, "Hex_value = %lx",
                        ((aci_gap_numeric_comparison_value_event_rp0 *)(blue_evt->data))->Numeric_Value);
            aci_gap_numeric_comparison_value_confirm_yesno(gap->gap_svc.connection_handle, 1);
            break;

        case (EVT_BLUE_GAP_PAIRING_CMPLT):
        {
            pairing_complete = (aci_gap_pairing_complete_event_rp0*)blue_evt->data;
            if (pairing_complete->Status) {
            FURI_LOG_E(GAP_TAG, "Pairing failed with status: %d. Terminating connection", pairing_complete->Status);
            aci_gap_terminate(gap->gap_svc.connection_handle, 5);
            } else {
            FURI_LOG_I(GAP_TAG, "Pairing complete");
            }
        }
            break;

        case EVT_BLUE_GAP_PROCEDURE_COMPLETE:
            FURI_LOG_I(GAP_TAG, "Procedure complete event");
            break;
        }
        default:
            break;
  }

  return SVCCTL_UserEvtFlowEnable;
}

void SVCCTL_SvcInit() {
    // Dummy function to prevent unused services initialization
    // TODO refactor (disable all services in WPAN config)
}

static void set_advertisment_service_uid(uint8_t* uid, uint8_t uid_len) {
    gap->gap_svc.adv_svc_uuid_len = 1;
    if(uid_len == 2) {
        gap->gap_svc.adv_svc_uuid[0] = AD_TYPE_16_BIT_SERV_UUID;
    } else if (uid_len == 4) {
        gap->gap_svc.adv_svc_uuid[0] = AD_TYPE_32_BIT_SERV_UUID;
    } else if(uid_len == 16) {
        gap->gap_svc.adv_svc_uuid[0] = AD_TYPE_128_BIT_SERV_UUID_CMPLT_LIST;
    }
    memcpy(&gap->gap_svc.adv_svc_uuid[1], uid, uid_len);
    gap->gap_svc.adv_svc_uuid_len += uid_len;
}

GapState gap_get_status() {
    return gap->state;
}

void gap_init_mac_address(Gap* gap) {
    uint8_t *otp_addr;
    uint32_t udn;
    uint32_t company_id;
    uint32_t device_id;

    udn = LL_FLASH_GetUDN();
    if(udn != 0xFFFFFFFF) {
        company_id = LL_FLASH_GetSTCompanyID();
        device_id = LL_FLASH_GetDeviceID();
        gap->mac_address[0] = (uint8_t)(udn & 0x000000FF);
        gap->mac_address[1] = (uint8_t)( (udn & 0x0000FF00) >> 8 );
        gap->mac_address[2] = (uint8_t)( (udn & 0x00FF0000) >> 16 );
        gap->mac_address[3] = (uint8_t)device_id;
        gap->mac_address[4] = (uint8_t)(company_id & 0x000000FF);;
        gap->mac_address[5] = (uint8_t)( (company_id & 0x0000FF00) >> 8 );
    } else {
        otp_addr = OTP_Read(0);
        if(otp_addr) {
            memcpy(gap->mac_address, ((OTP_ID0_t*)otp_addr)->bd_address, sizeof(gap->mac_address));
        } else {
            memcpy(gap->mac_address, gap_default_mac_addr, sizeof(gap->mac_address));
        }
    }
}

static void gap_init_svc(Gap* gap) {
    tBleStatus status;
    uint32_t srd_bd_addr[2];

    //HCI Reset to synchronise BLE Stack*/
    hci_reset();
    // Configure mac address
    gap_init_mac_address(gap);
    aci_hal_write_config_data(CONFIG_DATA_PUBADDR_OFFSET, CONFIG_DATA_PUBADDR_LEN, (uint8_t*)gap->mac_address);

    /* Static random Address
     * The two upper bits shall be set to 1
     * The lowest 32bits is read from the UDN to differentiate between devices
     * The RNG may be used to provide a random number on each power on
     */
    srd_bd_addr[1] = 0x0000ED6E;
    srd_bd_addr[0] = LL_FLASH_GetUDN();
    aci_hal_write_config_data( CONFIG_DATA_RANDOM_ADDRESS_OFFSET, CONFIG_DATA_RANDOM_ADDRESS_LEN, (uint8_t*)srd_bd_addr );
    // Set Identity root key used to derive LTK and CSRK
    aci_hal_write_config_data( CONFIG_DATA_IR_OFFSET, CONFIG_DATA_IR_LEN, (uint8_t*)gap_irk );
    // Set Encryption root key used to derive LTK and CSRK
    aci_hal_write_config_data( CONFIG_DATA_ER_OFFSET, CONFIG_DATA_ER_LEN, (uint8_t*)gap_erk );
    // Set TX Power to 0 dBm
    aci_hal_set_tx_power_level(1, 0x19);
    // Initialize GATT interface
    aci_gatt_init();
    // Initialize GAP interface
    const char *name = furi_hal_version_get_device_name_ptr();
    aci_gap_init(GAP_PERIPHERAL_ROLE, 0, strlen(name),
                &gap->gap_svc.gap_svc_handle, &gap->gap_svc.dev_name_char_handle, &gap->gap_svc.appearance_char_handle);

    // Set GAP characteristics
    status = aci_gatt_update_char_value(gap->gap_svc.gap_svc_handle, gap->gap_svc.dev_name_char_handle, 0, strlen(name), (uint8_t *) name);
    if (status) {
        FURI_LOG_E(GAP_TAG, "Failed updating name characteristic: %d", status);
    }
    status = aci_gatt_update_char_value(gap->gap_svc.gap_svc_handle, gap->gap_svc.appearance_char_handle, 0, 2, gap_appearence_char_uuid);
    if(status) {
        FURI_LOG_E(GAP_TAG, "Failed updating appearence characteristic: %d", status);
    }
    // Set default PHY
    hci_le_set_default_phy(ALL_PHYS_PREFERENCE, TX_2M_PREFERRED, RX_2M_PREFERRED);
    // Set I/O capability
    aci_gap_set_io_capability(IO_CAP_DISPLAY_ONLY);
    // Setup  authentication
    aci_gap_set_authentication_requirement(1, 1, 1, 0, 8, 16, 1, 0, PUBLIC_ADDR);
    // Configure whitelist
    aci_gap_configure_whitelist();
}

static void gap_advertise(GapState new_state)
{
    tBleStatus status;
    uint16_t min_interval;
    uint16_t max_interval;

    if (new_state == GapStateAdvFast) {
        min_interval = 0x80; // 80 ms
        max_interval = 0xa0; // 100 ms
    } else {
        min_interval = 0x0640; // 1 s
        max_interval = 0x0fa0; // 2.5 s
    }
    // Stop advertising timer
    osTimerStop(gap->advertise_timer);

    if ((new_state == GapStateAdvLowPower) && ((gap->state == GapStateAdvFast) || (gap->state == GapStateAdvLowPower))) {
        // Stop advertising
        status = aci_gap_set_non_discoverable();
        if (status) {
            FURI_LOG_E(GAP_TAG, "Stop Advertising Failed, result: %d", status);
        }
    }
    // Configure advertising
    gap->state = new_state;
    const char* name = furi_hal_version_get_ble_local_device_name_ptr();
    status = aci_gap_set_discoverable(ADV_IND, min_interval, max_interval, PUBLIC_ADDR, 0,
                                        strlen(name), (uint8_t*)name,
                                        gap->gap_svc.adv_svc_uuid_len, gap->gap_svc.adv_svc_uuid, 0, 0);
    if(status) {
        FURI_LOG_E(GAP_TAG, "Set discoverable err: %d", status);
    }
    osTimerStart(gap->advertise_timer, INITIAL_ADV_TIMEOUT);
}

static void gap_advertise_request(Gap* gap) {
    osThreadFlagsSet(gap->thread_id, 1);
}

static void gap_advetise_timer_callback(void* context) {
    furi_assert(context);
    Gap* gap = context;
    gap_advertise_request(gap);
}

bool gap_init() {
    if (APPE_Status() != BleGlueStatusStarted) {
        return false;
    }

    gap = furi_alloc(sizeof(Gap));
    srand(DWT->CYCCNT);
    // Open Bt record
    gap->bt = furi_record_open("bt");
    // Create advertising timer
    gap->advertise_timer = osTimerNew(gap_advetise_timer_callback, osTimerOnce, &gap, NULL);
    // Initialization of HCI & GATT & GAP layer
    gap_init_svc(gap);
    // Initialization of the BLE Services
    SVCCTL_Init();
    // Initialization of the BLE App Context
    gap->state = GapStateIdle;
    gap->gap_svc.connection_handle = 0xFFFF;

    // Thread configuration
    gap->thread_attr.name = "BLE advertising";
    gap->thread_attr.stack_size = 512;
    gap->thread_id = osThreadNew(gap_app, NULL, &gap->thread_attr);

    // Start Device Information service
    dev_info_svc_start();
    // Start Battery service
    battery_svc_start();
    // Start Serial application
    serial_svc_start();
    // Configure advirtise service UUID
    uint8_t adv_service_uid[2];
    adv_service_uid[0] = 0x80 | furi_hal_version_get_hw_color();
    adv_service_uid[1] = 0x30;

    set_advertisment_service_uid(adv_service_uid, sizeof(adv_service_uid));
    gap_advertise(GapStateAdvFast);
    return true;
}

static void gap_app(void *arg) {
    // TODO Exit from app, stop service, clean memory
    while(1) {
        osThreadFlagsWait(1, osFlagsWaitAny, osWaitForever);
        gap_advertise(GapStateAdvLowPower);
    }
}