Please, read the package information for SoftingCAN first!
The example is configured for the "CANusb" interface card from Softing (www.softing.com) (but, given that the deviceName parameter is set correctly, should work with all of their interface cards supporting their Softing CAN Layer 2 software API). Two messages are defined: txMessage for sending and rxMessage for receiving. The SerialPackager blocks are used to add/retrieve data to/from the messages.