Determining if DFU occurred

[nrbrook]

After a DFU, when the new firmware is booted a service changed indication is not being sent so iOS only sees the DFU service. Should the softdevice be sending the service changed indication automatically? Here it says pm_local_database_has_changed() should be called, but how should I determine if a DFU has just been performed?

[nrbrook]

Here is some improved code which uses the UUIDs of the attributes instead of assuming the location of the CCCD relative to the characteristic declaration:

static ret_code_t service_changed_cccd(uint16_t conn_handle, const uint16_t * p_cccd)
{
    uint16_t   end_handle;
    bool sc_found = false;
    ret_code_t err_code = sd_ble_gatts_initial_user_handle_get(&end_handle);
    ASSERT(err_code == NRF_SUCCESS);

    for (uint16_t handle = 1; handle < end_handle; handle++)
    {
        ble_uuid_t uuid;
        err_code = sd_ble_gatts_attr_get(handle, &uuid, NULL);
        VERIFY_SUCCESS(err_code);
        if(uuid.type != BLE_UUID_TYPE_BLE)
        {
            continue;
        }
        if(uuid.uuid == BLE_UUID_CHARACTERISTIC)
        {
            // characteristic declaration specification from Bluetooth 4.0 Vol 3 3.3.1
            static const uint8_t decl_val_size = 5;
            NRF_LOG_DEBUG("Found char at handle %d", handle);
            // get characteristic declaration
            uint8_t decl_val[decl_val_size];
            ble_gatts_value_t characteristic_decl = {.p_value = decl_val, .len = decl_val_size, .offset = 0};
            err_code = sd_ble_gatts_value_get(conn_handle, handle, &characteristic_decl);
            VERIFY_SUCCESS(err_code);
            if(characteristic_decl.len != decl_val_size)
            {
                continue;
            }
            uint16_t char_uuid = *((uint16_t *)&decl_val[3]);
            sc_found = char_uuid == BLE_UUID_GATT_CHARACTERISTIC_SERVICE_CHANGED;
            // skip past characteristic value handle
            handle = *((uint16_t *)&decl_val[1]);
            NRF_LOG_DEBUG("Skipping past val handle to %d (%s)", handle+1, sc_found ? "sc found" : "sc not found");
        }
        else if(sc_found && (uuid.uuid == BLE_UUID_DESCRIPTOR_CLIENT_CHAR_CONFIG))
        {
            NRF_LOG_DEBUG("Found cccd at handle %d", handle);
            ble_gatts_value_t cccd_val = {.p_value = (uint8_t *)p_cccd, .len = 2, .offset = 0};
            return sd_ble_gatts_value_get(conn_handle, handle, &cccd_val);
        }
    }
    NRF_LOG_DEBUG("Did not find service changed CCCD");
    return NRF_ERROR_NOT_FOUND;
}