Which function using for send data through specific uuid characteristics discovered in central

I'm using nrf51822 (peripheral) ,nrf52832 ( central) devices. In peripheral side i have created custom services and its 16byte uuid characteristics. Thats working fine because i can able to see all services and its chara in nrf connect and able to communicate also. Now im using nrf52832 as master with S132 SD. I discovered all the services and its characteristics in nrf52832. So How can able to send data through specific custom uuid characteristics?? which function i want to use for it ??

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