Hi Mehran,
LPCXpresso doesn't support JN-516x.
To work with JN-516x, please use BeyondStudio for NXP
download link of BeyondStudio for NXP :
IEEE 802.15.4 for JN516x and JN517x|NXP
User guide:
https://www.nxp.com/docs/en/user-guide/JN-UG-3098.pdf
Hope this helps.
Have a great day,
Jennie Zhang
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