How to reduce the bluetooth range in nrf52840.

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Hello

 I am using 3 nRF52840 DK for proxy light switch example. Using this I want to relay the ON/OFF signal from 1 server to other.

To test the relay mode working, I need to reduce the Bluetooth range so it can be tested easily.

1) What change is needed in proxy light switch to reduce the range?

2) Is there other way to test relay mode working in short area?

Thanks

[awneil]

Reduce the Tx power ?

devzone.nordicsemi.com/.../just-set-tx-power

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I am using it for Mesh network with S140 Softdevice, how can I set tx_power?