bt_gatt: Unable to register handle 0x0016 when calling smp_bt_register()

Question

From https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/ncs-dfu, it suggests to call smp_bt_register() for nRF Connect SDK v2.3 or newer. But RTT Viewer shows "<err> bt_gatt: Unable to register handle 0x0016".

The following are log messages of RTT Viewer.

00> *** Booting Zephyr OS build v3.3.99-ncs1 ***
00> Starting Bluetooth Peripheral LBS example before OTA
00> Before calling smp_bt_register()
00> [00:00:00.540,344] <err> bt_gatt: Unable to register handle 0x0016
00> After calling smp_bt_register()
00> Bluetooth initialized
00> Advertising successfully started

Procedures to reproduce this issue are as follows.

1. Unzipping peripheral_lbs.zip to D:\ncs\v2.4.0\nrf\samples\bluetooth folder.

2. cd D:\ncs\v2.4.0\nrf\samples\bluetooth\peripheral_lbs

3. west build -b nrf5340dk_nrf5340_cpuapp

4. west flash

5. Rebooting nRF5340 device and connecting to RTT Viewer.

AHaug · Answer

Hi, 
 Please use the insert code function when attaching build logs. It makes it far easier to navigate your case if you do so. And also thank you for providing steps to recreate what you see unprompted. That helps speed up the process. 
 
 snowuyl said: Thanks for your reply! I try to build mcuboot_smp_ble project as you suggested. But it failed to build with a lot of undefined symbols. 
 This is due to the sample not being compatible with NCS v2.4.0 as I mentioned, which is also the reason for why I supplied you with the second bluetooth smp sample from the zephyr, sample repository:) The error messages you see is due to there being changes in between version and due to missing configurations. https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/samples/subsys/mgmt/mcumgr/smp_svr/README.html 
 The zephyr sample I mentioned works out of the box for nRF5340DK and in NCS v2.4.0. What you need to do know is to use this knowledge and these two samples to create your application. Everything you have to make it work is mentioned here. 
 
 You can base your application on the Zephyr sample alone 
 You can use the Zephyr sample to cross examine mcuboot_smp_ble sample from the github repository and see what requirements you need to make it work. 
 
 For instance, one step to make mcuboot_smp_ble to work is to copy the contents of prj.conf and overlay-bt.conf from the zephyr sample and paste it in mcuboot_smp_ble's prj.conf.

2a. will leave you with something like the following configuration. Do note that this configuration is in no way optimal, but it shows how you can easily use something from one sample, to make another sample compile, build and test for you to continue debugging and developing. 
 # CONFIG_BOOTLOADER_MCUBOOT=y
# CONFIG_MCUMGR=y
# CONFIG_MCUMGR_SMP_UART=y
# CONFIG_MCUMGR_CMD_IMG_MGMT=y
# CONFIG_MCUMGR_CMD_OS_MGMT=y

# CONFIG_BT=y
# CONFIG_BT_PERIPHERAL=y
# CONFIG_BT_CENTRAL=y
# #CONFIG_BT_DEVICE_NAME="Zep"

# # Enable the Bluetooth mcumgr transport (unauthenticated).
# CONFIG_MCUMGR_SMP_BT=y
# CONFIG_MCUMGR_SMP_BT_AUTHEN=n
# CONFIG_MCUMGR_SMP_BT_CONN_PARAM_CONTROL=y


# CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2304
# CONFIG_FLASH=y

# # Allow for large Bluetooth data packets.
# CONFIG_BT_L2CAP_TX_MTU=498
# CONFIG_BT_BUF_ACL_RX_SIZE=502
# CONFIG_BT_BUF_ACL_TX_SIZE=502
# CONFIG_BT_CTLR_DATA_LENGTH_MAX=251

# # Enable the mcumgr Packet Reassembly feature over Bluetooth and its configuration dependencies.
# # MCUmgr buffer size is optimized to fit one SMP packet divided into five Bluetooth Write Commands,
# # transmitted with the maximum possible MTU value: 498 bytes.
# CONFIG_MCUMGR_SMP_REASSEMBLY_BT=y
# CONFIG_MCUMGR_BUF_SIZE=2475
# CONFIG_OS_MGMT_MCUMGR_PARAMS=y
# CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096



################# CONTENT OF overlay-bt-conf FROM ZEPHYR SAMPLE ##############################
CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y

# Allow for large Bluetooth data packets.
CONFIG_BT_L2CAP_TX_MTU=498
CONFIG_BT_BUF_ACL_RX_SIZE=502
CONFIG_BT_BUF_ACL_TX_SIZE=502
CONFIG_BT_CTLR_DATA_LENGTH_MAX=251

# Enable the Bluetooth mcumgr transport (unauthenticated).
CONFIG_MCUMGR_TRANSPORT_BT=y
CONFIG_MCUMGR_TRANSPORT_BT_AUTHEN=n
CONFIG_MCUMGR_TRANSPORT_BT_CONN_PARAM_CONTROL=y

# Enable the Shell mcumgr transport.
CONFIG_BASE64=y
CONFIG_SHELL=y
CONFIG_SHELL_BACKEND_SERIAL=y
CONFIG_MCUMGR_TRANSPORT_SHELL=y

# Enable the mcumgr Packet Reassembly feature over Bluetooth and its configuration dependencies.
# MCUmgr buffer size is optimized to fit one SMP packet divided into five Bluetooth Write Commands,
# transmitted with the maximum possible MTU value: 498 bytes.
CONFIG_MCUMGR_TRANSPORT_BT_REASSEMBLY=y
CONFIG_MCUMGR_TRANSPORT_NETBUF_SIZE=2475
CONFIG_MCUMGR_GRP_OS_MCUMGR_PARAMS=y
CONFIG_MCUMGR_TRANSPORT_WORKQUEUE_STACK_SIZE=4608

# Enable the LittleFS file system.
CONFIG_FILE_SYSTEM=y
CONFIG_FILE_SYSTEM_LITTLEFS=y

# Enable file system commands
CONFIG_MCUMGR_GRP_FS=y

# Enable the storage erase command.
CONFIG_MCUMGR_GRP_ZBASIC=y
CONFIG_MCUMGR_GRP_ZBASIC_STORAGE_ERASE=y

# Disable Bluetooth ping support
CONFIG_BT_CTLR_LE_PING=n

# Disable shell commands that are not needed
CONFIG_CLOCK_CONTROL_NRF_SHELL=n
CONFIG_DEVICE_SHELL=n
CONFIG_DEVMEM_SHELL=n
CONFIG_FLASH_SHELL=n
################## CONTENT OF prj.conf FROM ZEPHYR SAMPLE #######################################

# Enable MCUmgr and dependencies.
CONFIG_NET_BUF=y
CONFIG_ZCBOR=y
CONFIG_CRC=y
CONFIG_MCUMGR=y
CONFIG_STREAM_FLASH=y
CONFIG_FLASH_MAP=y

# Some command handlers require a large stack.
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2304
CONFIG_MAIN_STACK_SIZE=2048

# Ensure an MCUboot-compatible binary is generated.
CONFIG_BOOTLOADER_MCUBOOT=y

# Enable flash operations.
CONFIG_FLASH=y

# Required by the `taskstat` command.
CONFIG_THREAD_MONITOR=y

# Support for taskstat command
CONFIG_MCUMGR_GRP_OS_TASKSTAT=y

# Enable statistics and statistic names.
CONFIG_STATS=y
CONFIG_STATS_NAMES=y

# Enable most core commands.
CONFIG_FLASH=y
CONFIG_IMG_MANAGER=y
CONFIG_MCUMGR_GRP_IMG=y
CONFIG_MCUMGR_GRP_OS=y
CONFIG_MCUMGR_GRP_STAT=y

# Enable logging
CONFIG_LOG=y
CONFIG_MCUBOOT_UTIL_LOG_LEVEL_WRN=y

# Disable debug logging
CONFIG_LOG_MAX_LEVEL=3


 
 Kind regards, Andreas