Hello Hee Lui,
Please refer to the section "7.4.4.5.1.13 NXP NetPDL Reference" in https://www.nxp.com/docs/en/supporting-information/QORIQ-SDK-2.0-IC-REV0.pdf for FMC NetPDL user guide.
Please refer to the section "7.4.4.5.1.13.5.1 The before Element", "7.4.4.5.1.13.5.2 The after Element" and "7.4.4.5.1.13.5.3.4 The action Element (for use in a Custom Protocol file)" for the keyword “shim1” description.
Have a great day,
TIC
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