ble_app_multilink_central and peripheral_temperature

I would like to create a program that was a mix of ble_app_multilink_central and peripheral_temperature. The program would work as follows: when the button1 of  central is pressed, will receive the temperature of the peripherals. 

some tips to elaborate the program?

what functions would I have to use to send the temperature information from the peripheral to the central?

thank you in advance and forgive the inconvenience