I am writing a dual-core app running on Portenta H7 with micropython on M7 + arduino code on M4.

My use-case for true paralelism is to call a function and never expect for the return value (since it's void anyway). I want to do this call in a non-blocking way, so I used rpc.call_async() but after 150 calls, I get this error:

timeout waiting for a free buffer
(OR)
memory allocation failed, allocating 4168 bytes

This does not happen with rpc.call(), but I do not want to introduce latency.

How can we achieve this?

Thanks!
R