Use Timer T1 retry counter for DISC sequence

src/server.c

@@ -2192,6 +2192,19 @@ static int handle_sock(uint32_t key,
                 return patty_ax25_sock_send_rr(sock, PATTY_AX25_FRAME_COMMAND, 1);
             }
 
+            break;
+
+        case PATTY_AX25_SOCK_PENDING_DISCONNECT:
+            if (patty_timer_expired(&sock->timer_t1)) {
+                if (sock->retries--) {
+                    patty_timer_start(&sock->timer_t1);
+
+                    return patty_ax25_sock_send_disc(sock, PATTY_AX25_FRAME_POLL);
+                } else {
+                    return sock_close(server, sock);
+                }
+            }
+
         default:
             break;
     }