nRF5340-DK - BLE multiple connection

Hello,

I'm trying to make the nrf5340-DK capable of connecting to BLE from multiple devices.

The program is based on: Bluetooth: Bluetooth: Peripheral UART.

I found the following discussions on this:

BLE multiple connections support - Nordic Q&A - Nordic DevZone - Nordic DevZone

Mutli role in NRF connect, Advertising while connected - Nordic Q&A - Nordic DevZone - Nordic DevZone

However the order only let me connect to one device and then it prints an advertising error:

[00:00:42.735,412] <wrn> bt_hci_core: opcode 0x200a status 0x0d
[00:00:42.735,443] <err> bt_adv: Failed to start advertiser
[00:00:42.735,473] <err> uart_debug: Advertising failed: -12


and thus nrf5340 stops being connectable for other devices.

in /proj.conf I have:

# UART async
CONFIG_UART_ASYNC_API=y

# Console/logging
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y
CONFIG_LOG=y
CONFIG_LOG_BACKEND_UART=y
CONFIG_LOG_BACKEND_RTT=n

# BLE
CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="UART_Debug"
CONFIG_BT_MAX_CONN=4
CONFIG_BT_MAX_PAIRED=4

# NUS service
CONFIG_BT_NUS=y

# BLE settings
CONFIG_BT_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y

# DK library pro LEDs
CONFIG_DK_LIBRARY=y

# Memory 
CONFIG_HEAP_MEM_POOL_SIZE=4096
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# Assert for debug
CONFIG_ASSERT=y

in src/sysbuild/ipc_radio/prj.conf I have:

CONFIG_SERIAL=n
CONFIG_UART_CONSOLE=n
CONFIG_LOG=n

and in src/sysbuild/ipc_radio/prj_bt_rpc.conf:

CONFIG_SERIAL=n
CONFIG_UART_CONSOLE=n
CONFIG_LOG=n

CONFIG_BT_PERIPHERAL=y
CONFIG_BT_CENTRAL=n
CONFIG_BT_CTLR_SDC_PERIPHERAL_COUNT=4
CONFIG_BT_MAX_CONN=4
CONFIG_BT_MAX_PAIRED=4
CONFIG_BT_DEVICE_NAME="Nordic_UART_Service"

Can you advise me how to ensure multiple connections (from multiple devices) to nRF5340-DK possible at the same time, please?

Thank you

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