This structure represents a TXT record entry representing a key/value pair (RFC 6763 - section 6.3).
The string buffers pointed to by mKey
and mValue
MUST persist and remain unchanged after an instance of such structure is passed to OpenThread (as part of otSrpClientService
instance).
An array of otDnsTxtEntry
entries are used in otSrpClientService
to specify the full TXT record (a list of entries).
Public Attributes#
The TXT record key string.
The TXT record value or already encoded TXT-DATA (depending on mKey
).
Number of bytes in mValue
buffer.
Public Attribute Documentation#
mKey#
const char* otDnsTxtEntry::mKey
The TXT record key string.
If mKey
is not NULL, then it MUST be a null-terminated C string. The entry is treated as key/value pair with mValue
buffer providing the value.
The entry is encoded as follows:
A single string length byte followed by "key=value" format (without the quotation marks).
In this case, the overall encoded length must be 255 bytes or less.
If
mValue
is NULL, then key is treated as a boolean attribute and encoded as "key" (with no=
).If
mValue
is not NULL butmValueLength
is zero, then it is treated as empty value and encoded as "key=".
If mKey
is NULL, then mValue
buffer is treated as an already encoded TXT-DATA and is appended as is in the DNS message.
92
of file include/openthread/dns.h
mValue#
const uint8_t* otDnsTxtEntry::mValue
The TXT record value or already encoded TXT-DATA (depending on mKey
).
93
of file include/openthread/dns.h
mValueLength#
uint16_t otDnsTxtEntry::mValueLength
Number of bytes in mValue
buffer.
94
of file include/openthread/dns.h