Arduino/esp8266/micropython/ports/nrf/drivers/bluetooth/ble_drv.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 - 2018 Glenn Ruben Bakke
 *
 * 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.
 */

#if BLUETOOTH_SD

#include <stdio.h>
#include <string.h>
#include <stdbool.h>

#include "py/runtime.h"
#include "ble_drv.h"
#include "mpconfigport.h"
#include "nrf_sdm.h"
#include "ble_gap.h"
#include "ble.h" // sd_ble_uuid_encode
#include "drivers/flash.h"
#include "mphalport.h"


#define BLE_DRIVER_VERBOSE 0

#if BLE_DRIVER_VERBOSE
  #define BLE_DRIVER_LOG printf
#else
  #define BLE_DRIVER_LOG(...)
#endif

#define BLE_ADV_LENGTH_FIELD_SIZE   1
#define BLE_ADV_AD_TYPE_FIELD_SIZE  1
#define BLE_AD_TYPE_FLAGS_DATA_SIZE 1

#define MSEC_TO_UNITS(TIME, RESOLUTION) (((TIME) * 1000) / (RESOLUTION))
#define UNIT_0_625_MS (625)
#define UNIT_10_MS    (10000)
#define APP_CFG_NON_CONN_ADV_TIMEOUT 0 // Disable timeout.
#define NON_CONNECTABLE_ADV_INTERVAL MSEC_TO_UNITS(100, UNIT_0_625_MS)

#define BLE_MIN_CONN_INTERVAL        MSEC_TO_UNITS(12, UNIT_0_625_MS)
#define BLE_MAX_CONN_INTERVAL        MSEC_TO_UNITS(12, UNIT_0_625_MS)
#define BLE_SLAVE_LATENCY            0
#define BLE_CONN_SUP_TIMEOUT         MSEC_TO_UNITS(4000, UNIT_10_MS)

#if (BLUETOOTH_SD == 110)
  #define MAX_TX_IN_PROGRESS         (6)
#else
  #define MAX_TX_IN_PROGRESS         (10)
#endif
#if !defined(GATT_MTU_SIZE_DEFAULT) && defined(BLE_GATT_ATT_MTU_DEFAULT)
  #define GATT_MTU_SIZE_DEFAULT BLE_GATT_ATT_MTU_DEFAULT
#endif

#define SD_TEST_OR_ENABLE() \
if (ble_drv_stack_enabled() == 0) { \
    (void)ble_drv_stack_enable(); \
}

static volatile bool m_adv_in_progress;
static volatile uint8_t m_tx_in_progress;

static ble_drv_gap_evt_callback_t          gap_event_handler;
static ble_drv_gatts_evt_callback_t        gatts_event_handler;

static mp_obj_t mp_gap_observer;
static mp_obj_t mp_gatts_observer;

#if (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)
static volatile bool m_primary_service_found;
static volatile bool m_characteristic_found;
static volatile bool m_write_done;

static volatile ble_drv_adv_evt_callback_t          adv_event_handler;
static volatile ble_drv_gattc_evt_callback_t        gattc_event_handler;
static volatile ble_drv_disc_add_service_callback_t disc_add_service_handler;
static volatile ble_drv_disc_add_char_callback_t    disc_add_char_handler;
static volatile ble_drv_gattc_char_data_callback_t  gattc_char_data_handle;

static mp_obj_t mp_adv_observer;
static mp_obj_t mp_gattc_observer;
static mp_obj_t mp_gattc_disc_service_observer;
static mp_obj_t mp_gattc_disc_char_observer;
static mp_obj_t mp_gattc_char_data_observer;
#endif

#if (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)
#include "nrf_nvic.h"
#define BLE_GAP_ADV_MAX_SIZE BLE_GATT_ATT_MTU_DEFAULT
#define BLE_DRV_CONN_CONFIG_TAG 1

static uint8_t m_adv_handle;
static uint8_t m_scan_buffer[BLE_GAP_SCAN_BUFFER_MIN];

nrf_nvic_state_t nrf_nvic_state = {0};
#endif

#if (BLUETOOTH_SD == 110)
void softdevice_assert_handler(uint32_t pc, uint16_t line_number, const uint8_t * p_file_name) {
    BLE_DRIVER_LOG("ERROR: SoftDevice assert!!!");
}
#else
void softdevice_assert_handler(uint32_t id, uint32_t pc, uint32_t info) {
    BLE_DRIVER_LOG("ERROR: SoftDevice assert!!!");
}
#endif

uint32_t ble_drv_stack_enable(void) {
    m_adv_in_progress = false;
    m_tx_in_progress  = 0;

#if (BLUETOOTH_SD == 110)
  #if BLUETOOTH_LFCLK_RC
    uint32_t err_code = sd_softdevice_enable(NRF_CLOCK_LFCLKSRC_RC_250_PPM_250MS_CALIBRATION,
                                             softdevice_assert_handler);
  #else
    uint32_t err_code = sd_softdevice_enable(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM,
                                             softdevice_assert_handler);
  #endif // BLUETOOTH_LFCLK_RC
#endif // (BLUETOOTH_SD == 110)

#if (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)
  #if BLUETOOTH_LFCLK_RC
    nrf_clock_lf_cfg_t clock_config = {
        .source = NRF_CLOCK_LF_SRC_RC,
        .rc_ctiv = 16,
        .rc_temp_ctiv = 2,
        .accuracy = NRF_CLOCK_LF_ACCURACY_250_PPM
    };
  #else
    nrf_clock_lf_cfg_t clock_config = {
        .source = NRF_CLOCK_LF_SRC_XTAL,
        .rc_ctiv = 0,
        .rc_temp_ctiv = 0,
        .accuracy = NRF_CLOCK_LF_ACCURACY_20_PPM
    };
  #endif // BLUETOOTH_LFCLK_RC

    uint32_t err_code = sd_softdevice_enable(&clock_config,
                                             softdevice_assert_handler);
#endif // (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)

    BLE_DRIVER_LOG("SoftDevice enable status: " UINT_FMT "\n", (uint16_t)err_code);

    err_code = sd_nvic_EnableIRQ(SD_EVT_IRQn);

    BLE_DRIVER_LOG("IRQ enable status: " UINT_FMT "\n", (uint16_t)err_code);

#if (BLUETOOTH_SD == 110)
    ble_enable_params_t ble_enable_params;
    memset(&ble_enable_params, 0x00, sizeof(ble_enable_params));
    ble_enable_params.gatts_enable_params.attr_tab_size = BLE_GATTS_ATTR_TAB_SIZE_DEFAULT;
    ble_enable_params.gatts_enable_params.service_changed  = 0;
#else
    ble_cfg_t ble_conf;
    uint32_t app_ram_start_cfg = 0x200039c0;
    ble_conf.conn_cfg.conn_cfg_tag                     = BLE_DRV_CONN_CONFIG_TAG;
    ble_conf.conn_cfg.params.gap_conn_cfg.conn_count   = 2;
    ble_conf.conn_cfg.params.gap_conn_cfg.event_length = 3;
    err_code = sd_ble_cfg_set(BLE_CONN_CFG_GAP, &ble_conf, app_ram_start_cfg);

    BLE_DRIVER_LOG("BLE_CONN_CFG_GAP status: " UINT_FMT "\n", (uint16_t)err_code);

    memset(&ble_conf, 0, sizeof(ble_conf));

    ble_conf.gap_cfg.role_count_cfg.periph_role_count   = 1;
    ble_conf.gap_cfg.role_count_cfg.central_role_count  = 1;
    ble_conf.gap_cfg.role_count_cfg.central_sec_count   = 0;
    err_code = sd_ble_cfg_set(BLE_GAP_CFG_ROLE_COUNT, &ble_conf, app_ram_start_cfg);

    BLE_DRIVER_LOG("BLE_GAP_CFG_ROLE_COUNT status: " UINT_FMT "\n", (uint16_t)err_code);

    memset(&ble_conf, 0, sizeof(ble_conf));
    ble_conf.conn_cfg.conn_cfg_tag                            = BLE_DRV_CONN_CONFIG_TAG;
    ble_conf.conn_cfg.params.gatts_conn_cfg.hvn_tx_queue_size = MAX_TX_IN_PROGRESS;
    err_code = sd_ble_cfg_set(BLE_CONN_CFG_GATTS, &ble_conf, app_ram_start_cfg);

    BLE_DRIVER_LOG("BLE_CONN_CFG_GATTS status: " UINT_FMT "\n", (uint16_t)err_code);
#endif

#if (BLUETOOTH_SD == 110)
    err_code = sd_ble_enable(&ble_enable_params);
#else
    uint32_t app_ram_start = 0x200039c0;
    err_code = sd_ble_enable(&app_ram_start); // 8K SD headroom from linker script.
    BLE_DRIVER_LOG("BLE ram size: " UINT_FMT "\n", (uint16_t)app_ram_start);
#endif

    BLE_DRIVER_LOG("BLE enable status: " UINT_FMT "\n", (uint16_t)err_code);

    // set up security mode
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

    const char device_name[] = "micr";

    if ((err_code = sd_ble_gap_device_name_set(&sec_mode,
                                               (const uint8_t *)device_name,
                                                strlen(device_name))) != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Cannot apply GAP parameters."));
    }

    // set connection parameters
    memset(&gap_conn_params, 0, sizeof(gap_conn_params));

    gap_conn_params.min_conn_interval = BLE_MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = BLE_MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = BLE_SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = BLE_CONN_SUP_TIMEOUT;

    if (sd_ble_gap_ppcp_set(&gap_conn_params) != 0) {

    nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
              "Cannot set PPCP parameters."));
    }

    return err_code;
}

void ble_drv_stack_disable(void) {
    sd_softdevice_disable();
}

uint8_t ble_drv_stack_enabled(void) {
    uint8_t is_enabled;
    uint32_t err_code = sd_softdevice_is_enabled(&is_enabled);
    (void)err_code;

    BLE_DRIVER_LOG("Is enabled status: " UINT_FMT "\n", (uint16_t)err_code);

    return is_enabled;
}

void ble_drv_address_get(ble_drv_addr_t * p_addr) {
    SD_TEST_OR_ENABLE();

    ble_gap_addr_t local_ble_addr;
#if (BLUETOOTH_SD == 110)
    uint32_t err_code = sd_ble_gap_address_get(&local_ble_addr);
#else
    uint32_t err_code = sd_ble_gap_addr_get(&local_ble_addr);
#endif

    if (err_code != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not query for the device address."));
    }

    BLE_DRIVER_LOG("ble address, type: " HEX2_FMT ", " \
                   "address: " HEX2_FMT ":" HEX2_FMT ":" HEX2_FMT ":" \
                               HEX2_FMT ":" HEX2_FMT ":" HEX2_FMT "\n", \
                   local_ble_addr.addr_type, \
                   local_ble_addr.addr[5], local_ble_addr.addr[4], local_ble_addr.addr[3], \
                   local_ble_addr.addr[2], local_ble_addr.addr[1], local_ble_addr.addr[0]);

    p_addr->addr_type = local_ble_addr.addr_type;
    memcpy(p_addr->addr, local_ble_addr.addr, 6);
}

bool ble_drv_uuid_add_vs(uint8_t * p_uuid, uint8_t * idx) {
    SD_TEST_OR_ENABLE();

    if (sd_ble_uuid_vs_add((ble_uuid128_t const *)p_uuid, idx) != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not add Vendor Specific 128-bit UUID."));
    }

    return true;
}

bool ble_drv_service_add(ubluepy_service_obj_t * p_service_obj) {
    SD_TEST_OR_ENABLE();

    if (p_service_obj->p_uuid->type > BLE_UUID_TYPE_BLE) {

        ble_uuid_t uuid;
        uuid.type  = p_service_obj->p_uuid->uuid_vs_idx;
        uuid.uuid  = p_service_obj->p_uuid->value[0];
        uuid.uuid += p_service_obj->p_uuid->value[1] << 8;

        if (sd_ble_gatts_service_add(p_service_obj->type,
                                     &uuid,
                                     &p_service_obj->handle) != 0) {
            nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                      "Can not add Service."));
        }
    } else if (p_service_obj->p_uuid->type == BLE_UUID_TYPE_BLE) {
        BLE_DRIVER_LOG("adding service\n");

        ble_uuid_t uuid;
        uuid.type  = p_service_obj->p_uuid->type;
        uuid.uuid  = p_service_obj->p_uuid->value[0];
        uuid.uuid += p_service_obj->p_uuid->value[1] << 8;

        if (sd_ble_gatts_service_add(p_service_obj->type,
                                     &uuid,
                                     &p_service_obj->handle) != 0) {
            nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                      "Can not add Service."));
        }
    }
    return true;
}

bool ble_drv_characteristic_add(ubluepy_characteristic_obj_t * p_char_obj) {
    ble_gatts_char_md_t char_md;
    ble_gatts_attr_md_t cccd_md;
    ble_gatts_attr_t    attr_char_value;
    ble_uuid_t          uuid;
    ble_gatts_attr_md_t attr_md;

    memset(&char_md, 0, sizeof(char_md));

    char_md.char_props.broadcast      = (p_char_obj->props & UBLUEPY_PROP_BROADCAST) ? 1 : 0;
    char_md.char_props.read           = (p_char_obj->props & UBLUEPY_PROP_READ) ? 1 : 0;
    char_md.char_props.write_wo_resp  = (p_char_obj->props & UBLUEPY_PROP_WRITE_WO_RESP) ? 1 : 0;
    char_md.char_props.write          = (p_char_obj->props & UBLUEPY_PROP_WRITE) ? 1 : 0;
    char_md.char_props.notify         = (p_char_obj->props & UBLUEPY_PROP_NOTIFY) ? 1 : 0;
    char_md.char_props.indicate       = (p_char_obj->props & UBLUEPY_PROP_INDICATE) ? 1 : 0;
#if 0
    char_md.char_props.auth_signed_wr = (p_char_obj->props & UBLUEPY_PROP_NOTIFY) ? 1 : 0;
#endif


    char_md.p_char_user_desc  = NULL;
    char_md.p_char_pf         = NULL;
    char_md.p_user_desc_md    = NULL;
    char_md.p_sccd_md         = NULL;

    // if cccd
    if (p_char_obj->attrs & UBLUEPY_ATTR_CCCD) {
        memset(&cccd_md, 0, sizeof(cccd_md));
        BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
        BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);
        cccd_md.vloc = BLE_GATTS_VLOC_STACK;
        char_md.p_cccd_md = &cccd_md;
    } else {
        char_md.p_cccd_md = NULL;
    }

    uuid.type  = p_char_obj->p_uuid->type;
    uuid.uuid  = p_char_obj->p_uuid->value[0];
    uuid.uuid += p_char_obj->p_uuid->value[1] << 8;

    memset(&attr_md, 0, sizeof(attr_md));

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);

    attr_md.vloc    = BLE_GATTS_VLOC_STACK;
    attr_md.rd_auth = 0;
    attr_md.wr_auth = 0;
    attr_md.vlen    = 1;

    memset(&attr_char_value, 0, sizeof(attr_char_value));

    attr_char_value.p_uuid    = &uuid;
    attr_char_value.p_attr_md = &attr_md;
    attr_char_value.init_len  = sizeof(uint8_t);
    attr_char_value.init_offs = 0;
    attr_char_value.max_len   = (GATT_MTU_SIZE_DEFAULT - 3);

    ble_gatts_char_handles_t handles;

    if (sd_ble_gatts_characteristic_add(p_char_obj->service_handle,
                                        &char_md,
                                        &attr_char_value,
                                        &handles) != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not add Characteristic."));
    }

    // apply handles to object instance
    p_char_obj->handle           = handles.value_handle;
    p_char_obj->user_desc_handle = handles.user_desc_handle;
    p_char_obj->cccd_handle      = handles.cccd_handle;
    p_char_obj->sccd_handle      = handles.sccd_handle;

    return true;
}

bool ble_drv_advertise_data(ubluepy_advertise_data_t * p_adv_params) {
    SD_TEST_OR_ENABLE();

    uint8_t byte_pos = 0;

    uint8_t adv_data[BLE_GAP_ADV_MAX_SIZE];

    if (p_adv_params->device_name_len > 0) {
        ble_gap_conn_sec_mode_t sec_mode;

        BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

        if (sd_ble_gap_device_name_set(&sec_mode,
                                       p_adv_params->p_device_name,
                                       p_adv_params->device_name_len) != 0) {
            nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
	              "Can not apply device name in the stack."));
        }

        BLE_DRIVER_LOG("Device name applied\n");

        adv_data[byte_pos] = (BLE_ADV_AD_TYPE_FIELD_SIZE + p_adv_params->device_name_len);
        byte_pos += BLE_ADV_LENGTH_FIELD_SIZE;
        adv_data[byte_pos] = BLE_GAP_AD_TYPE_COMPLETE_LOCAL_NAME;
        byte_pos += BLE_ADV_AD_TYPE_FIELD_SIZE;
        memcpy(&adv_data[byte_pos], p_adv_params->p_device_name, p_adv_params->device_name_len);
        // increment position counter to see if it fits, and in case more content should
        // follow in this adv packet.
        byte_pos += p_adv_params->device_name_len;
    }

    // Add FLAGS only if manually controlled data has not been used.
    if (p_adv_params->data_len == 0) {
        // set flags, default to disc mode
        adv_data[byte_pos] = (BLE_ADV_AD_TYPE_FIELD_SIZE + BLE_AD_TYPE_FLAGS_DATA_SIZE);
        byte_pos += BLE_ADV_LENGTH_FIELD_SIZE;
        adv_data[byte_pos] = BLE_GAP_AD_TYPE_FLAGS;
        byte_pos += BLE_AD_TYPE_FLAGS_DATA_SIZE;
        adv_data[byte_pos] = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
        byte_pos += 1;
    }

    if (p_adv_params->num_of_services > 0) {

        bool type_16bit_present  = false;
        bool type_128bit_present = false;

        for (uint8_t i = 0; i < p_adv_params->num_of_services; i++) {
            ubluepy_service_obj_t * p_service = (ubluepy_service_obj_t *)p_adv_params->p_services[i];
            if (p_service->p_uuid->type == UBLUEPY_UUID_16_BIT) {
                type_16bit_present = true;
            }

            if (p_service->p_uuid->type == UBLUEPY_UUID_128_BIT) {
                type_128bit_present = true;
            }
        }

        if (type_16bit_present) {
            uint8_t size_byte_pos = byte_pos;

            // skip length byte for now, apply total length post calculation
            byte_pos += BLE_ADV_LENGTH_FIELD_SIZE;

            adv_data[byte_pos] = BLE_GAP_AD_TYPE_16BIT_SERVICE_UUID_COMPLETE;
            byte_pos += BLE_ADV_AD_TYPE_FIELD_SIZE;

            uint8_t uuid_total_size = 0;
            uint8_t encoded_size    = 0;

            for (uint8_t i = 0; i < p_adv_params->num_of_services; i++) {
                ubluepy_service_obj_t * p_service = (ubluepy_service_obj_t *)p_adv_params->p_services[i];

                ble_uuid_t uuid;
                uuid.type  = p_service->p_uuid->type;
                uuid.uuid  = p_service->p_uuid->value[0];
                uuid.uuid += p_service->p_uuid->value[1] << 8;
                // calculate total size of uuids
                if (sd_ble_uuid_encode(&uuid, &encoded_size, NULL) != 0) {
                    nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                              "Can not encode UUID, to check length."));
                }

                // do encoding into the adv buffer
                if (sd_ble_uuid_encode(&uuid, &encoded_size, &adv_data[byte_pos]) != 0) {
                    nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                              "Can encode UUID into the advertisment packet."));
                }

                BLE_DRIVER_LOG("encoded uuid for service %u: ", 0);
                for (uint8_t j = 0; j < encoded_size; j++) {
                    BLE_DRIVER_LOG(HEX2_FMT " ", adv_data[byte_pos + j]);
                }
                BLE_DRIVER_LOG("\n");

                uuid_total_size += encoded_size; // size of entry
                byte_pos        += encoded_size; // relative to adv data packet
                BLE_DRIVER_LOG("ADV: uuid size: %u, type: %u, uuid: %x%x, vs_idx: %u\n",
                       encoded_size, p_service->p_uuid->type,
                       p_service->p_uuid->value[1],
                       p_service->p_uuid->value[0],
                       p_service->p_uuid->uuid_vs_idx);
            }

            adv_data[size_byte_pos] = (BLE_ADV_AD_TYPE_FIELD_SIZE + uuid_total_size);
        }

        if (type_128bit_present) {
            uint8_t size_byte_pos = byte_pos;

            // skip length byte for now, apply total length post calculation
            byte_pos += BLE_ADV_LENGTH_FIELD_SIZE;

            adv_data[byte_pos] = BLE_GAP_AD_TYPE_128BIT_SERVICE_UUID_COMPLETE;
            byte_pos += BLE_ADV_AD_TYPE_FIELD_SIZE;

            uint8_t uuid_total_size = 0;
            uint8_t encoded_size    = 0;

            for (uint8_t i = 0; i < p_adv_params->num_of_services; i++) {
                ubluepy_service_obj_t * p_service = (ubluepy_service_obj_t *)p_adv_params->p_services[i];

                ble_uuid_t uuid;
                uuid.type  = p_service->p_uuid->uuid_vs_idx;
                uuid.uuid  = p_service->p_uuid->value[0];
                uuid.uuid += p_service->p_uuid->value[1] << 8;

                // calculate total size of uuids
                if (sd_ble_uuid_encode(&uuid, &encoded_size, NULL) != 0) {
                    nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                              "Can not encode UUID, to check length."));
                }

                // do encoding into the adv buffer
                if (sd_ble_uuid_encode(&uuid, &encoded_size, &adv_data[byte_pos]) != 0) {
                    nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                              "Can encode UUID into the advertisment packet."));
                }

                BLE_DRIVER_LOG("encoded uuid for service %u: ", 0);
                for (uint8_t j = 0; j < encoded_size; j++) {
                    BLE_DRIVER_LOG(HEX2_FMT " ", adv_data[byte_pos + j]);
                }
                BLE_DRIVER_LOG("\n");

                uuid_total_size += encoded_size; // size of entry
                byte_pos        += encoded_size; // relative to adv data packet
                BLE_DRIVER_LOG("ADV: uuid size: %u, type: %x%x, uuid: %u, vs_idx: %u\n",
                       encoded_size, p_service->p_uuid->type,
                       p_service->p_uuid->value[1],
                       p_service->p_uuid->value[0],
                       p_service->p_uuid->uuid_vs_idx);
            }

            adv_data[size_byte_pos] = (BLE_ADV_AD_TYPE_FIELD_SIZE + uuid_total_size);
        }
    }

    if ((p_adv_params->data_len > 0) && (p_adv_params->p_data != NULL)) {
        if (p_adv_params->data_len + byte_pos > BLE_GAP_ADV_MAX_SIZE) {
            nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                      "Can not fit data into the advertisment packet."));
        }

        memcpy(adv_data, p_adv_params->p_data, p_adv_params->data_len);
        byte_pos += p_adv_params->data_len;
    }

    // scan response data not set
    uint32_t err_code;
#if (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)
    const ble_gap_adv_data_t m_adv_data = {
        .adv_data.p_data      = adv_data,
        .adv_data.len         = byte_pos,
        .scan_rsp_data.p_data = NULL,
        .scan_rsp_data.len    = 0
    };
#endif

    static ble_gap_adv_params_t m_adv_params;
    memset(&m_adv_params, 0, sizeof(m_adv_params));

    // initialize advertising params
    if (p_adv_params->connectable) {
#if (BLUETOOTH_SD == 110)
        m_adv_params.type             = BLE_GAP_ADV_TYPE_ADV_IND;
#else
        m_adv_params.properties.type  = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
#endif
    } else {
#if (BLUETOOTH_SD == 110)
        m_adv_params.type             = BLE_GAP_ADV_TYPE_ADV_NONCONN_IND;
#else
        m_adv_params.properties.type  = BLE_GAP_ADV_TYPE_NONCONNECTABLE_SCANNABLE_UNDIRECTED;
#endif
    }

#if (BLUETOOTH_SD == 110)
    m_adv_params.fp                          = BLE_GAP_ADV_FP_ANY;
    m_adv_params.timeout                     = 0;                                   // infinite advertisment
#else
    m_adv_params.properties.anonymous        = 0;
    m_adv_params.properties.include_tx_power = 0;
    m_adv_params.filter_policy               = 0;
    m_adv_params.max_adv_evts                = 0; // infinite advertisment
    m_adv_params.primary_phy                 = BLE_GAP_PHY_AUTO;
    m_adv_params.secondary_phy               = BLE_GAP_PHY_AUTO;
    m_adv_params.scan_req_notification       = 0; // Do not raise scan request notifications when scanned.
#endif
    m_adv_params.p_peer_addr                 = NULL;                                // undirected advertisement
    m_adv_params.interval                    = MSEC_TO_UNITS(100, UNIT_0_625_MS);   // approx 8 ms

#if (BLUETOOTH_SD == 110)
    if ((err_code = sd_ble_gap_adv_data_set(adv_data, byte_pos, NULL, 0)) != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not apply advertisment data. status: 0x" HEX2_FMT, (uint16_t)err_code));
    }
#else
    if ((err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &m_adv_params)) != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not apply advertisment data. status: 0x" HEX2_FMT, (uint16_t)err_code));
    }
#endif
    BLE_DRIVER_LOG("Set Adv data size: " UINT_FMT "\n", byte_pos);

    ble_drv_advertise_stop();

#if (BLUETOOTH_SD == 110)
    err_code = sd_ble_gap_adv_start(&m_adv_params);
#else
    uint8_t conf_tag = BLE_DRV_CONN_CONFIG_TAG; // Could also be set to tag from sd_ble_cfg_set
    err_code = sd_ble_gap_adv_start(m_adv_handle, conf_tag);
#endif
    if (err_code != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not start advertisment. status: 0x" HEX2_FMT, (uint16_t)err_code));
    }

    m_adv_in_progress = true;

    return true;
}

void ble_drv_advertise_stop(void) {
    if (m_adv_in_progress == true) {
        uint32_t err_code;

#if (BLUETOOTH_SD == 110)
        if ((err_code = sd_ble_gap_adv_stop()) != 0) {
            nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                      "Can not stop advertisment. status: 0x" HEX2_FMT, (uint16_t)err_code));
        }
#else
        if ((err_code = sd_ble_gap_adv_stop(m_adv_handle)) != 0) {
            nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                      "Can not stop advertisment. status: 0x" HEX2_FMT, (uint16_t)err_code));
        }
#endif
    }
    m_adv_in_progress = false;
}

void ble_drv_attr_s_read(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data) {
    ble_gatts_value_t gatts_value;
    memset(&gatts_value, 0, sizeof(gatts_value));

    gatts_value.len     = len;
    gatts_value.offset  = 0;
    gatts_value.p_value = p_data;

    uint32_t err_code = sd_ble_gatts_value_get(conn_handle,
                                               handle,
                                               &gatts_value);
    if (err_code != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not read attribute value. status: 0x" HEX2_FMT, (uint16_t)err_code));
    }

}

void ble_drv_attr_s_write(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data) {
    ble_gatts_value_t gatts_value;
    memset(&gatts_value, 0, sizeof(gatts_value));

    gatts_value.len     = len;
    gatts_value.offset  = 0;
    gatts_value.p_value = p_data;

    uint32_t err_code = sd_ble_gatts_value_set(conn_handle, handle, &gatts_value);

    if (err_code != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not write attribute value. status: 0x" HEX2_FMT, (uint16_t)err_code));
    }
}

void ble_drv_attr_s_notify(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data) {
    uint16_t               hvx_len = len;
    ble_gatts_hvx_params_t hvx_params;

    memset(&hvx_params, 0, sizeof(hvx_params));

    hvx_params.handle = handle;
    hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
    hvx_params.offset = 0;
    hvx_params.p_len  = &hvx_len;
    hvx_params.p_data = p_data;

    while (m_tx_in_progress > MAX_TX_IN_PROGRESS) {
        ;
    }

    BLE_DRIVER_LOG("Request TX, m_tx_in_progress: %u\n", m_tx_in_progress);
    uint32_t err_code;
    if ((err_code = sd_ble_gatts_hvx(conn_handle, &hvx_params)) != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not notify attribute value. status: 0x" HEX2_FMT, (uint16_t)err_code));
    }
    m_tx_in_progress++;
    BLE_DRIVER_LOG("Queued TX, m_tx_in_progress: %u\n", m_tx_in_progress);
}

void ble_drv_gap_event_handler_set(mp_obj_t obj, ble_drv_gap_evt_callback_t evt_handler) {
    mp_gap_observer = obj;
    gap_event_handler = evt_handler;
}

void ble_drv_gatts_event_handler_set(mp_obj_t obj, ble_drv_gatts_evt_callback_t evt_handler) {
    mp_gatts_observer = obj;
    gatts_event_handler = evt_handler;
}

#if (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)

void ble_drv_gattc_event_handler_set(mp_obj_t obj, ble_drv_gattc_evt_callback_t evt_handler) {
    mp_gattc_observer = obj;
    gattc_event_handler = evt_handler;
}

void ble_drv_adv_report_handler_set(mp_obj_t obj, ble_drv_adv_evt_callback_t evt_handler) {
    mp_adv_observer = obj;
    adv_event_handler = evt_handler;
}


void ble_drv_attr_c_read(uint16_t conn_handle, uint16_t handle, mp_obj_t obj, ble_drv_gattc_char_data_callback_t cb) {

    mp_gattc_char_data_observer = obj;
    gattc_char_data_handle = cb;

    uint32_t err_code = sd_ble_gattc_read(conn_handle,
                                          handle,
                                          0);
    if (err_code != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not read attribute value. status: 0x" HEX2_FMT, (uint16_t)err_code));
    }

    while (gattc_char_data_handle != NULL) {
        ;
    }
}

void ble_drv_attr_c_write(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data, bool w_response) {

    ble_gattc_write_params_t write_params;

    if (w_response) {
            write_params.write_op = BLE_GATT_OP_WRITE_REQ;
    } else {
        write_params.write_op = BLE_GATT_OP_WRITE_CMD;
    }

    write_params.flags    = BLE_GATT_EXEC_WRITE_FLAG_PREPARED_CANCEL;
    write_params.handle   = handle;
    write_params.offset   = 0;
    write_params.len      = len;
    write_params.p_value  = p_data;

    m_write_done = !w_response;

    uint32_t err_code = sd_ble_gattc_write(conn_handle, &write_params);

    if (err_code != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
            "Can not write attribute value. status: 0x" HEX2_FMT, (uint16_t)err_code));
    }

    while (m_write_done != true) {
        ;
    }
}

void ble_drv_scan_start(bool cont) {
    SD_TEST_OR_ENABLE();

    ble_gap_scan_params_t scan_params;
    memset(&scan_params, 0, sizeof(ble_gap_scan_params_t));
    scan_params.extended = 0;
    scan_params.active   = 1;
    scan_params.interval = MSEC_TO_UNITS(100, UNIT_0_625_MS);
    scan_params.window   = MSEC_TO_UNITS(100, UNIT_0_625_MS);
    scan_params.timeout  = 0; // Infinite

    ble_data_t scan_buffer = {
        .p_data = m_scan_buffer,
        .len    = BLE_GAP_SCAN_BUFFER_MIN
    };

    uint32_t err_code;
    ble_gap_scan_params_t * p_scan_params = &scan_params;
    if (cont) {
        p_scan_params = NULL;
    }
    if ((err_code = sd_ble_gap_scan_start(p_scan_params, &scan_buffer)) != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not start scanning. status: 0x" HEX2_FMT, (uint16_t)err_code));
    }
}

void ble_drv_scan_stop(void) {
    sd_ble_gap_scan_stop();
}

void ble_drv_connect(uint8_t * p_addr, uint8_t addr_type) {
    SD_TEST_OR_ENABLE();

    ble_gap_scan_params_t scan_params;
    memset(&scan_params, 0, sizeof(ble_gap_scan_params_t));
    scan_params.extended = 0;
    scan_params.active   = 1;
    scan_params.interval = MSEC_TO_UNITS(100, UNIT_0_625_MS);
    scan_params.window   = MSEC_TO_UNITS(100, UNIT_0_625_MS);
    scan_params.timeout  = 0; // infinite

    ble_gap_addr_t addr;
    memset(&addr, 0, sizeof(addr));

    addr.addr_type = addr_type;
    memcpy(addr.addr, p_addr, 6);

    BLE_DRIVER_LOG("GAP CONNECTING: "HEX2_FMT":"HEX2_FMT":"HEX2_FMT":"HEX2_FMT":"HEX2_FMT":"HEX2_FMT", type: %d\n",
                   addr.addr[0], addr.addr[1], addr.addr[2], addr.addr[3], addr.addr[4], addr.addr[5], addr.addr_type);

    ble_gap_conn_params_t conn_params;

    // set connection parameters
    memset(&conn_params, 0, sizeof(conn_params));

    conn_params.min_conn_interval = BLE_MIN_CONN_INTERVAL;
    conn_params.max_conn_interval = BLE_MAX_CONN_INTERVAL;
    conn_params.slave_latency     = BLE_SLAVE_LATENCY;
    conn_params.conn_sup_timeout  = BLE_CONN_SUP_TIMEOUT;

    uint8_t conn_tag = BLE_DRV_CONN_CONFIG_TAG;

    uint32_t err_code;
    if ((err_code = sd_ble_gap_connect(&addr,
                                       &scan_params,
                                       &conn_params,
                                       conn_tag)) != 0) {
        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
                  "Can not connect. status: 0x" HEX2_FMT, (uint16_t)err_code));
    }
}

bool ble_drv_discover_services(mp_obj_t obj, uint16_t conn_handle, uint16_t start_handle, ble_drv_disc_add_service_callback_t cb) {
    BLE_DRIVER_LOG("Discover primary services. Conn handle: 0x" HEX2_FMT "\n",
                   conn_handle);

    mp_gattc_disc_service_observer = obj;
    disc_add_service_handler = cb;

    m_primary_service_found = false;

    uint32_t err_code;
    err_code = sd_ble_gattc_primary_services_discover(conn_handle,
                                                      start_handle,
                                                      NULL);
    if (err_code != 0) {
        return false;
    }

    // busy loop until last service has been iterated
    while (disc_add_service_handler != NULL) {
        ;
    }

    if (m_primary_service_found) {
        return true;
    } else {
        return false;
    }
}

bool ble_drv_discover_characteristic(mp_obj_t obj,
                                     uint16_t conn_handle,
                                     uint16_t start_handle,
                                     uint16_t end_handle,
                                     ble_drv_disc_add_char_callback_t cb) {
    BLE_DRIVER_LOG("Discover characteristicts. Conn handle: 0x" HEX2_FMT "\n",
                   conn_handle);

    mp_gattc_disc_char_observer = obj;
    disc_add_char_handler = cb;

    ble_gattc_handle_range_t handle_range;
    handle_range.start_handle = start_handle;
    handle_range.end_handle   = end_handle;

    m_characteristic_found = false;

    uint32_t err_code;
    err_code = sd_ble_gattc_characteristics_discover(conn_handle, &handle_range);
    if (err_code != 0) {
        return false;
    }

    // busy loop until last service has been iterated
    while (disc_add_char_handler != NULL) {
        ;
    }

    if (m_characteristic_found) {
        return true;
    } else {
        return false;
    }
}

void ble_drv_discover_descriptors(void) {

}

#endif // (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)

static void sd_evt_handler(uint32_t evt_id) {
    switch (evt_id) {
#if MICROPY_MBFS
        case NRF_EVT_FLASH_OPERATION_SUCCESS:
            flash_operation_finished(FLASH_STATE_SUCCESS);
            break;
        case NRF_EVT_FLASH_OPERATION_ERROR:
            flash_operation_finished(FLASH_STATE_ERROR);
            break;
#endif
        default:
            // unhandled event!
            break;
    }
}

static void ble_evt_handler(ble_evt_t * p_ble_evt) {
// S132 event ranges.
// Common 0x01 -> 0x0F
// GAP    0x10 -> 0x2F
// GATTC  0x30 -> 0x4F
// GATTS  0x50 -> 0x6F
// L2CAP  0x70 -> 0x8F
    switch (p_ble_evt->header.evt_id) {
        case BLE_GAP_EVT_CONNECTED:
            BLE_DRIVER_LOG("GAP CONNECT\n");
            m_adv_in_progress = false;
            gap_event_handler(mp_gap_observer, p_ble_evt->header.evt_id, p_ble_evt->evt.gap_evt.conn_handle, p_ble_evt->header.evt_len - (2 * sizeof(uint16_t)), NULL);

            ble_gap_conn_params_t conn_params;
            (void)sd_ble_gap_ppcp_get(&conn_params);
            (void)sd_ble_gap_conn_param_update(p_ble_evt->evt.gap_evt.conn_handle, &conn_params);
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            BLE_DRIVER_LOG("GAP DISCONNECT\n");
            gap_event_handler(mp_gap_observer, p_ble_evt->header.evt_id, p_ble_evt->evt.gap_evt.conn_handle, p_ble_evt->header.evt_len - (2 * sizeof(uint16_t)), NULL);
            break;

        case BLE_GATTS_EVT_HVC:
            gatts_event_handler(mp_gatts_observer, p_ble_evt->header.evt_id, p_ble_evt->evt.gatts_evt.params.hvc.handle, p_ble_evt->header.evt_len - (2 * sizeof(uint16_t)), NULL);
            break;

        case BLE_GATTS_EVT_WRITE:
            BLE_DRIVER_LOG("GATTS write\n");

            uint16_t  handle   = p_ble_evt->evt.gatts_evt.params.write.handle;
            uint16_t  data_len = p_ble_evt->evt.gatts_evt.params.write.len;
            uint8_t * p_data   = &p_ble_evt->evt.gatts_evt.params.write.data[0];

            gatts_event_handler(mp_gatts_observer, p_ble_evt->header.evt_id, handle, data_len, p_data);
            break;

        case BLE_GAP_EVT_CONN_PARAM_UPDATE:
            BLE_DRIVER_LOG("GAP CONN PARAM UPDATE\n");
            break;

        case BLE_GATTS_EVT_SYS_ATTR_MISSING:
            // No system attributes have been stored.
            (void)sd_ble_gatts_sys_attr_set(p_ble_evt->evt.gatts_evt.conn_handle, NULL, 0, 0);
            break;

#if (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)
        case BLE_GATTS_EVT_HVN_TX_COMPLETE:
#else
        case BLE_EVT_TX_COMPLETE:
#endif
            BLE_DRIVER_LOG("BLE EVT TX COMPLETE\n");
#if (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)
            BLE_DRIVER_LOG("HVN_TX_COMPLETE, count: %u\n", p_ble_evt->evt.gatts_evt.params.hvn_tx_complete.count);
            m_tx_in_progress -= p_ble_evt->evt.gatts_evt.params.hvn_tx_complete.count;
            BLE_DRIVER_LOG("TX_COMPLETE, m_tx_in_progress: %u\n", m_tx_in_progress);
#else
            BLE_DRIVER_LOG("TX_COMPLETE, count: %u\n", p_ble_evt->evt.common_evt.params.tx_complete.count);
            m_tx_in_progress -= p_ble_evt->evt.common_evt.params.tx_complete.count;
            BLE_DRIVER_LOG("TX_COMPLETE, m_tx_in_progress: %u\n", m_tx_in_progress);
#endif
            break;

        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            BLE_DRIVER_LOG("BLE EVT SEC PARAMS REQUEST\n");
            // pairing not supported
            (void)sd_ble_gap_sec_params_reply(p_ble_evt->evt.gatts_evt.conn_handle,
                                              BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP,
                                              NULL, NULL);
            break;

#if (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)
        case BLE_GAP_EVT_ADV_REPORT:
            BLE_DRIVER_LOG("BLE EVT ADV REPORT\n");
            ble_drv_adv_data_t adv_data = {
                .p_peer_addr  = p_ble_evt->evt.gap_evt.params.adv_report.peer_addr.addr,
                .addr_type    = p_ble_evt->evt.gap_evt.params.adv_report.peer_addr.addr_type,
                .is_scan_resp = p_ble_evt->evt.gap_evt.params.adv_report.type.scan_response,
                .rssi         = p_ble_evt->evt.gap_evt.params.adv_report.rssi,
                .data_len     = p_ble_evt->evt.gap_evt.params.adv_report.data.len,
                .p_data       = p_ble_evt->evt.gap_evt.params.adv_report.data.p_data,
//              .adv_type     =
            };
            // TODO: Fix unsafe callback to possible undefined callback...
            adv_event_handler(mp_adv_observer,
                              p_ble_evt->header.evt_id,
                              &adv_data);
            break;

        case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
            BLE_DRIVER_LOG("BLE EVT CONN PARAM UPDATE REQUEST\n");

            (void)sd_ble_gap_conn_param_update(p_ble_evt->evt.gap_evt.conn_handle,
                                               &p_ble_evt->evt.gap_evt.params.conn_param_update_request.conn_params);
            break;

        case BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP:
            BLE_DRIVER_LOG("BLE EVT PRIMARY SERVICE DISCOVERY RESPONSE\n");
            BLE_DRIVER_LOG(">>> service count: %d\n", p_ble_evt->evt.gattc_evt.params.prim_srvc_disc_rsp.count);

            for (uint16_t i = 0; i < p_ble_evt->evt.gattc_evt.params.prim_srvc_disc_rsp.count; i++) {
                ble_gattc_service_t * p_service = &p_ble_evt->evt.gattc_evt.params.prim_srvc_disc_rsp.services[i];

                ble_drv_service_data_t service;
                service.uuid_type    = p_service->uuid.type;
                service.uuid         = p_service->uuid.uuid;
                service.start_handle = p_service->handle_range.start_handle;
                service.end_handle   = p_service->handle_range.end_handle;

                disc_add_service_handler(mp_gattc_disc_service_observer, &service);
            }

            if (p_ble_evt->evt.gattc_evt.params.prim_srvc_disc_rsp.count > 0) {
                m_primary_service_found = true;
            }

            // mark end of service discovery
            disc_add_service_handler = NULL;

            break;

        case BLE_GATTC_EVT_CHAR_DISC_RSP:
            BLE_DRIVER_LOG("BLE EVT CHAR DISCOVERY RESPONSE\n");
            BLE_DRIVER_LOG(">>> characteristic count: %d\n", p_ble_evt->evt.gattc_evt.params.char_disc_rsp.count);

            for (uint16_t i = 0; i < p_ble_evt->evt.gattc_evt.params.char_disc_rsp.count; i++) {
                ble_gattc_char_t * p_char = &p_ble_evt->evt.gattc_evt.params.char_disc_rsp.chars[i];

                ble_drv_char_data_t char_data;
                char_data.uuid_type    = p_char->uuid.type;
                char_data.uuid         = p_char->uuid.uuid;
                char_data.decl_handle  = p_char->handle_decl;
                char_data.value_handle = p_char->handle_value;

                char_data.props |= (p_char->char_props.broadcast) ? UBLUEPY_PROP_BROADCAST : 0;
                char_data.props |= (p_char->char_props.read) ? UBLUEPY_PROP_READ : 0;
                char_data.props |= (p_char->char_props.write_wo_resp) ? UBLUEPY_PROP_WRITE_WO_RESP : 0;
                char_data.props |= (p_char->char_props.write) ? UBLUEPY_PROP_WRITE : 0;
                char_data.props |= (p_char->char_props.notify) ? UBLUEPY_PROP_NOTIFY : 0;
                char_data.props |= (p_char->char_props.indicate) ? UBLUEPY_PROP_INDICATE : 0;
            #if 0
                char_data.props |= (p_char->char_props.auth_signed_wr) ? UBLUEPY_PROP_NOTIFY : 0;
            #endif

                disc_add_char_handler(mp_gattc_disc_char_observer, &char_data);
            }

            if (p_ble_evt->evt.gattc_evt.params.char_disc_rsp.count > 0) {
                m_characteristic_found = true;
            }

            // mark end of characteristic discovery
            disc_add_char_handler = NULL;

            break;

        case BLE_GATTC_EVT_READ_RSP:
            BLE_DRIVER_LOG("BLE EVT READ RESPONSE, offset: 0x"HEX2_FMT", length: 0x"HEX2_FMT"\n",
                           p_ble_evt->evt.gattc_evt.params.read_rsp.offset,
                           p_ble_evt->evt.gattc_evt.params.read_rsp.len);

            gattc_char_data_handle(mp_gattc_char_data_observer,
                                   p_ble_evt->evt.gattc_evt.params.read_rsp.len,
                                   p_ble_evt->evt.gattc_evt.params.read_rsp.data);

            // mark end of read
            gattc_char_data_handle = NULL;

            break;

        case BLE_GATTC_EVT_WRITE_RSP:
            BLE_DRIVER_LOG("BLE EVT WRITE RESPONSE\n");
            m_write_done = true;
            break;

        case BLE_GATTC_EVT_HVX:
            BLE_DRIVER_LOG("BLE EVT HVX RESPONSE\n");
            break;

        case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
            BLE_DRIVER_LOG("GATTS EVT EXCHANGE MTU REQUEST\n");
            (void)sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.gatts_evt.conn_handle, 23); // MAX MTU size
            break;
#endif // (BLUETOOTH_SD == 132) || (BLUETOOTH_SD == 140)

        default:
            BLE_DRIVER_LOG(">>> unhandled evt: 0x" HEX2_FMT "\n", p_ble_evt->header.evt_id);
            break;
    }
}

static uint8_t m_ble_evt_buf[sizeof(ble_evt_t) + (GATT_MTU_SIZE_DEFAULT)] __attribute__ ((aligned (4)));

#ifdef NRF51
void SWI2_IRQHandler(void) {
#else
void SWI2_EGU2_IRQHandler(void) {
#endif

    uint32_t evt_id;
    while (sd_evt_get(&evt_id) != NRF_ERROR_NOT_FOUND) {
        sd_evt_handler(evt_id);
    }

    while (1) {
        uint16_t evt_len  = sizeof(m_ble_evt_buf);
        uint32_t err_code = sd_ble_evt_get(m_ble_evt_buf, &evt_len);
        if (err_code != NRF_SUCCESS) {
            // Possible error conditions:
            //  * NRF_ERROR_NOT_FOUND: no events left, break
            //  * NRF_ERROR_DATA_SIZE: retry with a bigger data buffer
            //    (currently not handled, TODO)
            //  * NRF_ERROR_INVALID_ADDR: pointer is not aligned, should
            //    not happen.
            // In all cases, it's best to simply stop now.
            if (err_code == NRF_ERROR_DATA_SIZE) {
                BLE_DRIVER_LOG("NRF_ERROR_DATA_SIZE\n");
            }
            break;
        }
        ble_evt_handler((ble_evt_t *)m_ble_evt_buf);
    }
}

#endif // BLUETOOTH_SD