MSP430FR6047: Perform a frequency sweep in real time from another MCU

Part Number: MSP430FR6047

Hello,

I am working on water meter that uses the MSP for the readings and another to handle communication and management. So far the communication is working and I have added some custom commands. Now I would like my MCU to request a frequency sweep in order to change the frequency on the traducers connected in order to have the best fit for the traducers used in real time. I have not been able to find the specific command or the number of commands that are required to do so. Any assistance would be great. 

Thank you for your time.

Nomikos Panagiotis