XPlmi_SsitMsgEventHandler
This is the event handler for the SSI technology message event from the primary SLR to secondary SLRs. When the message event is triggered from a primary SLR to any of the secondary SLRs, this API is called. It calls the module's handler based on the command data, and writes the response received from the module to the secondary SLR response buffer and acknowledges the message event.