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About changing connection parameters

Central info
   SDK: 15.3
   nRF52840

Peripheral info
   SDK: 13.1
   nRF52832


I want to increase the communication speed after connection.
I want to know how to set the communication speed setting value in Central.

Currently, the setting value of the communication speed is changed by calling the sd_ble_gap_conn_param_update () function from the peripheral.
What functions must be called and the Define value to be changed in order to change the communication speed setting value with Central?