how to control connect the connect distance within a range（45-60m）？

[delay_7]

Dear all：

         I want to control my central(52840) device to connect with peripheral(52810) within a range （45-60m），i change the tx power，but it set -4dbm，the distance is just 37m.set 0dbm,the distance is about 90 m. i hope the max connect distance is 45-60m,  so how to control connect the connect distance within a range（45-60m）？

best wishs

[haakonsh]

You can try to use RSSI of the advertisers to determine what devices you want to connect to.