SCTP_SENDER_DRY_EVENT not callback back

[obackup]

When I use the usrsctp library (latest, submission point: fd070e0) to send large files, I first call usrsctp_sendv to send 4 times, then wait for the SCTP_SENDER_DRY_EVENT event callback, and then send 4 more times. The process repeats this way, but there is an SCTP_SENDER_DRY_EVENT event that has not been callback back, and the link has not been disconnected. The last data sent has already been received by the other end. This is why the SCTP_SENDER_DRY_EVENT event has not been callback back? How should we handle it?

[mrsudhi77]

It works for me.
After the receive buffer gets empty, I get SCTP_SENDER_DRY_EVENT.
Have you used setsockopt for SCTP_SENDER_DRY_EVENT ?
Please try something like this..

struct sctp_event event;
struct socket *server_sock;

server_sock = usrsctp_socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP, /*use_cb?receive_cb:*/ NULL, NULL, 0, NULL)

memset(&event, 0, sizeof(event));
event.se_assoc_id = SCTP_FUTURE_ASSOC;
event.se_on = 1;
event.se_type = SCTP_SENDER_DRY_EVENT;
if (usrsctp_setsockopt(server_sock, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event)) < 0)
{
    // Print error
}

ALso, please make sure the capture the SCTP_SENDER_DRY_EVENT event.