unsigned char* data; /**< received data from remote device */
size_t len; /**< received data length */
size_t totalLen; /**< total coap data length required to receive */
+ size_t bufLen; /**< Buffer length. Buffer will be grown dynamically with respect to data received. */
unsigned char tlsdata[18437]; /**< tls data(rfc5246: TLSCiphertext max (2^14+2048+5)) */
size_t tlsLen; /**< received tls data length */
CAProtocol_t protocol; /**< application-level protocol */