SDK is NCS2.9.2,My device supports master-slave integration. As a slave, it can pair and bind with a mobile phone. As a master, it can scan and connect to two slave devices without needing to pair and bind with them.
Currently, I'm enabling broadcast connection to a mobile phone. After a successful connection, I call `bt_conn_set_security(connection, BT_SECURITY_L2)` to trigger pairing and binding. However, if I enable `CONFIG_BT_CENTRAL=y` in the `prj.conf` file, triggering pairing returns a security level error code `BT_SECURITY_ERR_AUTH_FAIL` (BT_SECURITY_L1). But if I disable `CONFIG_BT_CENTRAL=n` and enable broadcast connection, pairing and binding with the mobile phone succeeds. What could be the reason for this?
1.Before each connection, I clear the binding information, so there is not Stale bond information
2.Below is the configuration of my prj.conf file.
# # Copyright (c) 2018 Nordic Semiconductor # # SPDX-License-Identifier: LicenseRef-Nordic-5-Clause # CONFIG_GPIO=y # Use Internal 32K xtal CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n CONFIG_BT=y CONFIG_BT_GATT_DM=y CONFIG_BT_GATT_CLIENT=y #CONFIG_BT_GATT_DM_MAX_ATTRS=10 CONFIG_BT_PERIPHERAL=y CONFIG_BT_DEVICE_NAME="AURA150" #CONFIG_BT_MAX_CONN=1 #CONFIG_BT_MAX_PAIRED=1 CONFIG_BT_DATA_LEN_UPDATE=y CONFIG_BT_USER_DATA_LEN_UPDATE=y CONFIG_BT_USER_PHY_UPDATE=y # Include the Bluetooth LE stack in the project. # Add,This allows the device to proactively initiate MTU negotiation after connection, without waiting for a request from the peer. CONFIG_BT_GATT_AUTO_UPDATE_MTU=y CONFIG_BT_GATT_DM_MAX_ATTRS=50 # support for the peripheral role from the Bluetooth LE stack CONFIG_BT_DEVICE_APPEARANCE=1152 CONFIG_BT_MAX_CONN=4 CONFIG_BT_BUF_ACL_RX_COUNT=6 CONFIG_BT_MAX_PAIRED=2 CONFIG_BT_SMP_SC_PAIR_ONLY=n CONFIG_BT_SMP_SC_ONLY=n CONFIG_BT_SMP=y CONFIG_BT_ID_MAX=1 CONFIG_BT_GATT_AUTO_SEC_REQ=y CONFIG_BT_FILTER_ACCEPT_LIST=y CONFIG_BT_PRIVACY=n CONFIG_BT_CENTRAL=y CONFIG_BT_SCAN=y CONFIG_BT_SCAN_FILTER_ENABLE=y CONFIG_BT_SCAN_UUID_CNT=2 CONFIG_BT_SCAN_ADDRESS_CNT=2 CONFIG_BT_SCAN_MANUFACTURER_DATA_CNT=1 #If it is not enabled,scanning must be disabled before calling bt_conn_le_create(); otherwise, error code -11 (-EAGAIN) will be returned. CONFIG_BT_SCAN_AND_INITIATE_IN_PARALLEL=y # DIS information CONFIG_BT_DIS=y CONFIG_BT_DIS_PNP=n CONFIG_BT_DIS_SERIAL_NUMBER=y CONFIG_BT_DIS_HW_REV=y CONFIG_BT_DIS_FW_REV=y CONFIG_RETENTION_BOOTLOADER_INFO_OUTPUT_SETTINGS=y CONFIG_BT_DIS_SETTINGS=y CONFIG_BT_DIS_STR_MAX=38 CONFIG_BT_DIS_SERIAL_NUMBER_STR="003F0000005800000000FFFFFFFFFFFF" CONFIG_BT_DIS_FW_REV_STR="1.00" CONFIG_BT_DIS_HW_REV_STR="1.10" # Enable the Battery Service CONFIG_BT_BAS=y # Enable the NUS service CONFIG_BT_NUS=y # Enable the BLE modules from NCS CONFIG_BT_NUS_CLIENT=y # Enable bonding #CONFIG_SETTINGS_NONE=y CONFIG_BT_SETTINGS=y #CONFIG_BT_GATT_CACHING=n # Enable bonding CONFIG_SETTINGS_NONE=n CONFIG_SETTINGS_RUNTIME=y CONFIG_BT_GATT_CACHING=n CONFIG_FLASH=y CONFIG_FLASH_PAGE_LAYOUT=y CONFIG_FLASH_MAP=y # This example requires more stack CONFIG_MAIN_STACK_SIZE=1152 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096 CONFIG_BT_CONN_TX_MAX=10 CONFIG_BT_ATT_TX_COUNT=10 #Enable FOTA over Bluetooth LE CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y # Enable the UART driver CONFIG_UART_ASYNC_API=y CONFIG_NRFX_UARTE0=y CONFIG_SERIAL=y # Make sure printk is printing to the UART console CONFIG_CONSOLE=y CONFIG_UART_CONSOLE=y # Config logger CONFIG_LOG=y CONFIG_USE_SEGGER_RTT=y CONFIG_LOG_BACKEND_RTT=n CONFIG_LOG_BACKEND_UART=y CONFIG_LOG_PRINTK=y CONFIG_ASSERT=y ############### peripheral config ############### CONFIG_NEWLIB_LIBC=y CONFIG_HEAP_MEM_POOL_SIZE=2048 CONFIG_MAIN_STACK_SIZE=8192 CONFIG_PM_DEVICE=y CONFIG_REBOOT=y CONFIG_POWEROFF=y CONFIG_NFCT_PINS_AS_GPIOS=y CONFIG_ADC=y CONFIG_PWM=y ############### Add bonding support to the application ############### CONFIG_SETTINGS=y CONFIG_BT_SETTINGS=y ## flash config ## CONFIG_FLASH=y CONFIG_FLASH_PAGE_LAYOUT=y CONFIG_FLASH_MAP=y CONFIG_ZMS=y
I currently have no idea why enabling CONFIG_BT_CENTRAL=y causes pairing/binding to fail.Please provide some ideas for solving this problem.
