BLE NUS data not sending > 20bytes

[Sunil vignesh]

Hi,

I have tested the ble_nus code in NCS v1.4.2

where i can't send 250 bytes

I want to send 250 bytes to ble nus data send for 100 ms once

How to enable data send of 250 bytes 100ms once

[ovrebekk]

Hi 

If you add the CONFIG_BT_NUS_UART_BUFFER_SIZE parameter to your prj.cnf file you should be able to change the UART data size from the default 20 bytes to something larger. 

Best regards
Torbjørn

[Sunil vignesh]

CONFIG_BT_NUS_UART_BUFFER_SIZE = 500

is it possible

does it need to set phy = 2M and ATT-MTU ?

and here i attach my prj.conf

#CONFIG_NCS_SAMPLES_DEFAULTS=y

#BT config
CONFIG_BT=y
CONFIG_BT_DEBUG_LOG=y
CONFIG_BT_MAX_CONN=2
CONFIG_BT_MAX_PAIRED=1
CONFIG_BT_SMP=y
CONFIG_BT_L2CAP_TX_BUF_COUNT=5
CONFIG_BT_PERIPHERAL=y

#Devie Name config
CONFIG_BT_DEVICE_NAME="Headset"
CONFIG_BT_DEVICE_APPEARANCE=961

#Device Info service config
CONFIG_BT_DIS=y
CONFIG_BT_DIS_PNP=y
CONFIG_BT_DIS_MANUF="NordicSemiconductor"
CONFIG_BT_DIS_PNP_VID_SRC=2
CONFIG_BT_DIS_PNP_VID=0x1915
CONFIG_BT_DIS_PNP_PID=0xEEEF
CONFIG_BT_DIS_PNP_VER=0x0100

#Battery Service Config
CONFIG_BT_BAS=y

#HID config
CONFIG_BT_HIDS=y
CONFIG_BT_HIDS_MAX_CLIENT_COUNT=1
CONFIG_BT_HIDS_DEFAULT_PERM_RW_ENCRYPT=y
CONFIG_BT_GATT_UUID16_POOL_SIZE=40
CONFIG_BT_GATT_CHRC_POOL_SIZE=20

CONFIG_BT_LL_SOFTDEVICE_DEFAULT=y
CONFIG_BT_CONN_CTX=y

# Enable the NUS service
CONFIG_BT_NUS=y

# Enable bonding
CONFIG_BT_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_NVS=y
CONFIG_SETTINGS=y
CONFIG_BT_SETTINGS_CCC_STORE_ON_WRITE=y

# Enable DK LED and Buttons library
CONFIG_DK_LIBRARY=y

# This example requires more workqueue stack
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# Enable the UART driver
CONFIG_UART_ASYNC_API=y
CONFIG_NRFX_UARTE1=y
CONFIG_SERIAL=y		

CONFIG_GPIO=y

# Make sure printk is not printing to the UART console
CONFIG_CONSOLE=y
CONFIG_RTT_CONSOLE=n
CONFIG_UART_CONSOLE=y
CONFIG_PRINTK=y

CONFIG_HEAP_MEM_POOL_SIZE=2048


# Config logger
CONFIG_LOG=y
CONFIG_LOG_BUFFER_SIZE=2048
CONFIG_LOG_PRINTK=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n

CONFIG_ASSERT=y

# Clock configuration
CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH=y

# I2C Enable
CONFIG_I2C=y
CONFIG_SENSOR=y

#MLX90393 Enable
CONFIG_MLX90393=y
CONFIG_MLX90393_TRIGGER_GLOBAL_THREAD=y

# NFC configuration
CONFIG_NFC_OOB_PAIRING=n

# Optimize for debug
CONFIG_DEBUG_OPTIMIZATIONS=y

# Added
CONFIG_BT_GATT_CLIENT=y

CONFIG_BT_USER_DATA_LEN_UPDATE=y
CONFIG_BT_RX_BUF_LEN=260
CONFIG_BT_ATT_TX_MAX=10
CONFIG_BT_ATT_PREPARE_COUNT=2
CONFIG_BT_CONN_TX_MAX=10
CONFIG_BT_L2CAP_TX_BUF_COUNT=10
CONFIG_BT_L2CAP_TX_MTU=252
CONFIG_BT_L2CAP_RX_MTU=252
CONFIG_BT_CTLR_TX_BUFFER_SIZE=251
CONFIG_BT_CTLR_DATA_LENGTH_MAX=251

i am reading 13 sensors through TWI and send the calculated value at every 100ms

data sample be

x,-3018,5826,-1944,-4055,6151,1699,-5840,-2676,7394,-6113
y,-5767,5830,-7638,5952,-6185,5262,-5650,5682,-6004,7257
z,-10541,10810,-16294,10959,11348,12433,-13132,10381,-11102,-11281

character will be 150 - 250 it varies

after connected to iphone and uart notify enabled

after 4 to 7 mins the device get restart and during debug found