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Issues with DFU and Secure BLE connection using MCUmgr

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I’m trying to perform a DFU with BLE but with a paired device using MCUmgr and SMP sever.. so far i have no luck.. has anyone done OTAU + Secure BLE connection before? 

CONFIG_MCUMGR=y # Enable mcumgr
CONFIG_MCUMGR_GRP_OS=y # Required for DFU

# MCUmgr dependencies
CONFIG_NET_BUF=y
CONFIG_ZCBOR=y
CONFIG_CRC=y
CONFIG_FLASH_MAP=y
CONFIG_FLASH=y

CONFIG_MCUMGR_TRANSPORT_BT=y # Enable the Bluetooth mcumgr transport (unauthenticated).
CONFIG_MCUMGR_GRP_IMG=y # Enable the image management handlers, Required for DFU
  1. daleonpz#0000
    April 25, 2025 at 5:31 pm

    the otau shows “conncting….”

  2. daleonpz#0000
    April 25, 2025 at 5:31 pm

    i’m pretty sure i’m missing in the prj.conf

  3. daleonpz#0000
    April 25, 2025 at 5:31 pm

    it seems i’m not allow to write on the characteristic 

    D    13:52:26.032    [McuMgr] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x01-00) 
I    13:52:26.084    [McuMgr] Data written to descr. 00002902-0000-1000-8000-00805f9b34fb  << this is missing
  4. daleonpz#0000
    April 25, 2025 at 5:31 pm

    i solved it after debugging mcumgr code… i had to set some extras options to modify connection interval

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Differences Between Classic ARM and ARM Cortex

Troubleshooting LoRa Communication between Arduino and Raspberry Pi

Building an 8-bit Analog Computer

Handling Multiple I2C Slaves on ATTiny1616