FOTA speed

[Thomas U]

Hello Nordic

Using the old SDK, i was able to do FOTA wiht 10kb/s.

After doing all kinds of tweaks, I am only able to obtain 5kb/s with the new connect SDK.

Can i increase the speed?

Here is my configuration file:

#CONFIG_NO_OPTIMIZATIONS=y
CONFIG_DEBUG_OPTIMIZATIONS=n

# General config
CONFIG_LOG=y

# Choose RTT console
CONFIG_LOG_BACKEND_RTT=y
CONFIG_UART_CONSOLE=n

# To enable floating point support
CONFIG_CBPRINTF_FP_SUPPORT=y

# Timer configuration
CONFIG_NRFX_TIMER0=y
CONFIG_NRFX_TIMER1=y
CONFIG_NRFX_TIMER2=y
CONFIG_NRFX_TIMER3=y
CONFIG_NRFX_TIMER4=y

CONFIG_GPIO=y

# Enable ADC
CONFIG_ADC=y

# Enable PWM
CONFIG_PWM=y

# Enable sensor
CONFIG_SENSOR=y

# Bluetooth settings
CONFIG_BT=y                    # Enable Bluetooth stack
CONFIG_BT_PERIPHERAL=y          # Enable peripheral role
CONFIG_BT_GATT_CLIENT=y
CONFIG_BT_DEVICE_NAME="HBLC/LT"    # Set Bluetooth device name
CONFIG_BT_GATT_DYNAMIC_DB=y





 
# Increase stack size for the main thread and System Workqueue
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
CONFIG_MAIN_STACK_SIZE=2048

# Flash storage and settings
CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_NVS=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_NVS_LOG_LEVEL_DBG=y



#Enable FOTA over Bluetooth LE without using CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU
# --------------- core ---------------
CONFIG_CRC=y
CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_MCUMGR=y
CONFIG_ZCBOR=y
CONFIG_MCUMGR_GRP_IMG=y          # DFU command set
CONFIG_IMG_MANAGER=y
CONFIG_STREAM_FLASH=y            # buffered writes

# --------------- Bluetooth ---------------
CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_MCUMGR_TRANSPORT_BT=y
CONFIG_MCUMGR_TRANSPORT_BT_CONN_PARAM_CONTROL=y   # optional
CONFIG_MCUMGR_TRANSPORT_BT_REASSEMBLY=y           
CONFIG_MCUMGR_TRANSPORT_NETBUF_SIZE=2475

# --------- (optional) throughput tweak ------
CONFIG_BT_L2CAP_TX_MTU=498
CONFIG_BT_BUF_ACL_TX_SIZE=255
CONFIG_BT_BUF_ACL_RX_SIZE=502
CONFIG_BT_CTLR_DATA_LENGTH_MAX=251
CONFIG_BT_CTLR_PHY_2M=y

# OS-management group – optional but handy
CONFIG_MCUMGR_GRP_OS=y
CONFIG_MCUMGR_GRP_OS_BOOTLOADER_INFO=y

# Progressive erase (optional, usually speeds up slot erase)
CONFIG_IMG_ERASE_PROGRESSIVELY=y

[Vidar Berg]

Hello,

It looks like you've already included the necessary configuration settings to increase the BLE throughput, and with this I would have expected the transfer rate to be closer to 20-30 kB/s. Could it be limited by the Mcumgr client maybe? To test the max. throughput, I recommend you try the nRF connect or the nRF device manager app on Android or iOS.

Best regards,

Vidar

[Thomas U]

Hello Vidar, I am using the nRF connect app on my android phone.

My phone:

moto g84 5G

Android version: 14

[Vidar Berg]

To narrow down the problem, could you try another SDK samples such as the peripheral_lbs sample and enable CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y and SB_CONFIG_BOOTLOADER_MCUBOOT to see if you get the same result? Alternatively try with another phone if you have.