chrysn a51460984b nanocoap: Add coap_opt_add_opaque
This option complements the existing coap_opt_add_{uint,string} and even
more special-purpose functions; its implementation is trivial given the
existing static _add_opt_pkt function.

The method is useful when working with ETags (ETag, If-Match options).
2019-04-12 11:04:47 +02:00
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