eMBMasterEnable() function
Enable the Modbus Master protocol stack. This function enables processing of Modbus Master frames. Enabling the protocol stack is only possible if it is in the disabled state.
Return value
If the protocol stack is now in the state enabled it returns eMBErrorCode::MB_ENOERR. If it was not in the disabled state it return eMBErrorCode::MB_EILLSTATE.