How to reduce RF transmission power for S2915A1-nucleo? OS is Contiki and network 6LoWPAN?

[AJama.1]

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[AJama.1]

I found the part that control RF output and can reduce the the transmission power.

radio-driver.c

uint8_t paLevelValue=0x25; /* for example, this value will give 23dBm about */

S2LPSpiWriteRegisters(PA_POWER8_ADDR, 1, &paLevelValue);

There is 8 power level can set in S2LP mcu address from 0x5A~0x61.

Anyone can explain how the settings can be done?