coap_split_uri should operate on const str about libcoap

[obgm]

The short answer is: I have no strong opinion on this and do not object in dropping the normalization. Please check commit cb6d3c4 if it does the right thing for you.

The long answer is: I agree that for constrained devices, it might be more useful to drop the normalization in favor of being able to pass strings from ROM (in contrast to strings from the network as the normalization is done here exactly for that purpose). Your argument that "there can still be different string representations of what is an equivalent network destination" is not relevant here as coap_split_uri() deals with the host part of a URI (cf. RFC 3986), not with DNS names. The canonical form of the host part is lowercase, and that's why coap_split_uri() has transformed it as a convenient service for applications that want to provide virtual hosts.

[chrysn]

Please check commit cb6d3c4 if it does the right thing for you.

Thanks, yes, things work now with ROM too.