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Nordic Case Info
  • Case ID: 329129
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Multiple ACL Connections (extended advertising)

Dekel

Hi,

I'm using nRF5340 Audio DK with a modified example code provided by   (thanks again!), which integrates peripheral NUS through extended advertisement in parallel to audio streaming (see ModifiedFiles.7z in the above support case).

Currently, I'm able to successfully connect with nRF Connect for Mobile to my DK while it's also broadcasting audio.

My goal is to be able to connect with 2 different clients simultaneously (e.g, with 2 different smartphones). I've modified main.c in broadcast_source, and as part of the main() fuction I call bt_le_ext_adv_create() twice in a row. The issue is that I receive "ENOMEM" for the second call and I'm not sure how to solve this:

static struct bt_le_ext_adv *adv_for_conn[CONFIG_BT_MAX_CONN]; //CONFIG_BT_MAX_CONN=2

...

for (int i = 0; i < CONFIG_BT_MAX_CONN; i++) 
{
	err = bt_le_ext_adv_create(BT_LE_EXT_ADV_CONN, NULL, &(adv_for_conn[i]));
	if (err) {
		LOG_ERR("Failed to create advertising set (err %d)", err);
		break;
	}

	err = bt_le_ext_adv_set_data(adv_for_conn[i], ad, ARRAY_SIZE(ad), NULL, 0);
	if (err) {
		LOG_ERR("Failed to set advertising data (err %d)", err);
	}
}

prj.conf:

#
# Copyright (c) 2022 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# nRF5340 Audio
CONFIG_NRF5340_AUDIO=y

CONFIG_SAMPLE_RATE_CONVERTER=y
CONFIG_SAMPLE_RATE_CONVERTER_FILTER_SIMPLE=y

# General
CONFIG_DEBUG=y
CONFIG_DEBUG_INFO=y
CONFIG_ASSERT=y
CONFIG_STACK_USAGE=y
CONFIG_THREAD_RUNTIME_STATS=y
CONFIG_STACK_SENTINEL=y
CONFIG_INIT_STACKS=y

# Uart driver
CONFIG_SERIAL=y

# Logging
CONFIG_LOG=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_LOG_TAG_MAX_LEN=2
CONFIG_LOG_TAG_DEFAULT="--"
CONFIG_LOG_BACKEND_UART=y

# Use this for debugging thread usage
#CONFIG_LOG_THREAD_ID_PREFIX=y

# Console related defines
CONFIG_CONSOLE=y
CONFIG_RTT_CONSOLE=y
CONFIG_UART_CONSOLE=y

# Shell related defines
CONFIG_SHELL=y
CONFIG_KERNEL_SHELL=y
CONFIG_USE_SEGGER_RTT=y
## Disable logs on RTT
CONFIG_SHELL_RTT_INIT_LOG_LEVEL_NONE=n
CONFIG_SHELL_BACKEND_RTT=y
CONFIG_SHELL_BACKEND_SERIAL=n
CONFIG_SHELL_VT100_COMMANDS=y
CONFIG_SHELL_VT100_COLORS=y
CONFIG_SHELL_STACK_SIZE=4096
CONFIG_SHELL_CMD_BUFF_SIZE=128
## Reduce shell memory usage
CONFIG_SHELL_WILDCARD=n
CONFIG_SHELL_HELP_ON_WRONG_ARGUMENT_COUNT=n
CONFIG_SHELL_STATS=n
CONFIG_SHELL_CMDS=n
CONFIG_SHELL_HISTORY=y

# Turn off default shell commands
CONFIG_I2C_SHELL=n
CONFIG_HWINFO_SHELL=n
CONFIG_CLOCK_CONTROL_NRF_SHELL=n
CONFIG_FLASH_SHELL=n
CONFIG_DEVICE_SHELL=n

# Suppress LOG_ERR messages from sd_check_card_type. Because SPI_SDHC has no card presence method,
# assume card is in slot. Thus error message is always shown if card is not inserted
CONFIG_SD_LOG_LEVEL_OFF=y

# Suppress LOG_INF messages from hci_core
CONFIG_BT_HCI_CORE_LOG_LEVEL_WRN=y

#Adding for NUS peri.
CONFIG_AUDIO_SOURCE_I2S=y
CONFIG_TRANSPORT_BIS=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_NUS=y
CONFIG_BT_MAX_CONN=2
CONFIG_BT_EXT_ADV_MAX_ADV_SET=2
CONFIG_BT_AUDIO_MAX_TRANSPORT_LATENCY_MS=80
CONFIG_BT_AUDIO_RETRANSMITS=1
CONFIG_BT_AUDIO_BITRATE_BROADCAST_SRC=32000


# 1=headset, 2=gateway (for flashing through VSCode)
CONFIG_AUDIO_DEV=2

#required by Raytac
CONFIG_BOARD_ENABLE_DCDC_NET=n
CONFIG_BOARD_ENABLE_DCDC_APP=n
CONFIG_BOARD_ENABLE_DCDC_HV=n
CONFIG_CLOCK_CONTROL_NRF=y
CONFIG_CLOCK_CONTROL=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y
CONFIG_CLOCK_CONTROL_NRF_CALIBRATION_PERIOD=1000

#Debug terminal
CONFIG_PRINTK=y
CONFIG_CBPRINTF_FP_SUPPORT=y

#peripherals
CONFIG_GPIO=y
CONFIG_PWM=y
CONFIG_PWM_LOG_LEVEL_DBG=y

I'd appreciate any help with solving this!

thanks.

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