Digging a bit more into this, it appears that in case of link local ipv6
address. also sin6_scope_id of sockaddr_in6 needs to be set:

struct sockaddr_in6
  {
    __SOCKADDR_COMMON (sin6_);
    in_port_t sin6_port;        /* Transport layer port # */
    uint32_t sin6_flowinfo;     /* IPv6 flow information */
    struct in6_addr sin6_addr;  /* IPv6 address */
    uint32_t sin6_scope_id;     /* IPv6 scope-id */
  };

and there is function if_nametoindex() in <net/if.h> that can be used to
convert interface name (in my case wlp1s0) into the scope id.

-- Juha

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