MISRA Error : comma operator used and Highest operation, operator ',', lacks side-effects

Hello,

I am getting following MISRA error.

Error :

Note 9008: comma operator used [MISRA 2012 Rule 12.3, advisory]

Warning 522: Highest operation, operator ',', lacks side-effects [MISRA 2012 Rule 2.2, required]

Autosar Code:

In model, this is the Sender receiver port.