diff --git a/sys/include/net/coap.h b/sys/include/net/coap.h index 4abecf7ba2..def4d5e2a2 100644 --- a/sys/include/net/coap.h +++ b/sys/include/net/coap.h @@ -51,6 +51,17 @@ extern "C" { #define COAP_OPT_LOCATION_QUERY (20) #define COAP_OPT_BLOCK2 (23) #define COAP_OPT_BLOCK1 (27) +/** + * @brief Size2 option + * + * Used by clients to request an estimate of a resource's + * total size from a server during block-wise transfer and by + * servers to inform clients about the size. + * + * @see [RFC 7959](https://datatracker.ietf.org/doc/html/rfc7959) + * @see [RFC 8613](https://datatracker.ietf.org/doc/html/rfc8613) + */ +#define COAP_OPT_SIZE2 (28) #define COAP_OPT_PROXY_URI (35) #define COAP_OPT_PROXY_SCHEME (39) /**