Hi @Anupama_B
Thank you so much for your interest in our products and for using our community.
I suggest you use or refer to SDK multicore_examples.
Please pay attention to whether the slave core is activated correctly.
For more information about RPMsg , please refer to SDK demo for details.

Wish it helps you.
If you still have question about it, please kindly let me know.
Best Regards
mayliu