[riot-notifications] [RIOT-OS/RIOT] net: add CoRE RD lookup client implementation (#10222)
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Mon Apr 1 04:19:17 CEST 2019
kb2ma commented on this pull request.
> +ssize_t cord_lc_ep_raw(const cord_lc_rd_t *rd, uint8_t content_format,
+ char *result, size_t maxlen);
+ * @brief Look for registered resources at a RD server
+ * @param[in] rd the target RD server
+ * @param[out] resources list of resources at @p rd
+ * @param[in] limit max number of resources prepared to receive
+ * @return number of found resources on success
+ * @return CORD_LC_NORSC if there is no resource lookup interface at @p rd
+ * @return CORD_LC_TIMEOUT if lookup timed out
+ * @return CORD_LC_ERR on any other internal error
+ssize_t cord_lc_res(const cord_lc_rd_t *rd, cord_lc_res_t *resources, size_t limit);
This function is resource intensive. I would consider an iterative function on the collected string from coap_lc_res_raw().
cord_lc_read_res(const char *source, clif_t *link)
where link is the output parameter. However, this function is similar to `coap_decode_links()` from #11189, so not that useful.
On the other hand, I would not be surprised to see a block based response from the RD. How to incorporate the possibility into the API? Rather than separately call `cord_lc_res_raw()` first, maybe something like this:
cord_lc_read_res(const cord_lc_rd_t *rd, char *input, unsigned input_len, clif_t *link)
where the cord_lc_rd_t param could be extended to include the block number. That means it could transparently retrieve the next block.
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