otDnsInitTxtEntryIterator() function

A pointer to the iterator to initialize (MUST NOT be NULL).

A pointer to buffer containing the encoded TXT data.

The length (number of bytes) of @p aTxtData.

Parses the TXT data from an iterator and gets the next TXT record entry (key/value pair). The @p aIterator MUST be initialized using `otDnsInitTxtEntryIterator()` before calling this function and the TXT data buffer used to initialize the iterator MUST persist and remain unchanged. Otherwise the behavior of this function is undefined. If the parsed key string length is smaller than or equal to `OT_DNS_TXT_KEY_ITER_MAX_LENGTH` the key string is returned in `mKey` in @p aEntry. But if the key is longer, then `mKey` is set to NULL and the entire encoded TXT entry string is returned in `mValue` and `mValueLength`.