Synchronous operation of two different types of MPPT chargers

Modifications
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1

I have two controllers:
EPEVER MPPT and MPPT RS 450/100 and SmartShunt.
For synchronous charging of the battery and synchronous passage of charging stages (absorption, float) it is necessary to control these devices.
With EPEVER everything is simple, I control it via Modbus.
It is necessary to transfer to MPPT RS:

  1. the voltage and current values ​​measured by the SmartShunt.
  2. at the right moment to give a command to MPPT RS so that the charge current is maintained at zero.

Now I am geting statistics from MPPT RS via the VE.Can.
I cannot find the necessary vreg command in order to implement points 1) and 2).
Maybe someone has solved such a problem.
Thanks!