Turn off any Nagle-like algorithm for SCTP

This means that packets will be sent as soon as possible and no unnecessary delays are introduced, at the cost of more packets in the network.
https://www.man7.org/linux/man-pages/man7/sctp.7.html

openair3/SCTP/sctp_common.c

@@ -63,6 +63,13 @@ int sctp_set_init_opt(int sd, uint16_t instreams, uint16_t outstreams,
     return -1;
   }
 
+  int flag = 1;
+  if (setsockopt(sd, IPPROTO_SCTP, SCTP_NODELAY, &flag, sizeof(flag)) < 0) {
+    SCTP_ERROR("setsockopt SCTP_NODELAY failed: %d:%s\n", errno, strerror(errno));
+    close(sd);
+    return -1;
+  }
+
   /* Allow socket reuse */
   if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) {
     SCTP_ERROR("setsockopt SO_REUSEADDR failed (%d:%s)\n", errno, strerror(errno));