How to get src and dst for pru_rpmsg_send?

[Andrew P. Lentvorski]

I seem to be missing something obvious: Where do I get the values for src and dst in the pru_rpmsg_send() function?

The TI examples do a pru_rpmsg_receive() first and then echo back to the same src and dst.  That seems ... odd.  What's the point of having a variable src and dst if they are effectively hardwired to a single communication channel?

Thanks.