Function libcoap_sys::coap_tls_read

pub unsafe extern "C" fn coap_tls_read(
    coap_session: *mut coap_session_t, 
    data: *mut u8, 
    data_len: usize
) -> isize

Read some data from a TLS peer.

Internal function.

@param coap_session The CoAP session. @param data Pointer to data. @param data_len Maximum number of bytes to read.

@return @c 0 if this should be retried, @c -1 if there is an error or the number of cleartext bytes read.