runtime: disable lwip TCP keepalive.

whitequark · whitequark · commit 0db6ef0e1ca3 · 2016-06-20T18:55:29.000Z
This sometimes results in an RST sent by lwip after a retransmission, although it is not clear exactly why. See #456.
diff --git a/artiq/runtime/liblwip/lwipopts.h b/artiq/runtime/liblwip/lwipopts.h
@@ -105,7 +105,7 @@ a lot of data that needs to be copied, this should be set high. */
 
 /* ---------- TCP options ---------- */
 #define LWIP_TCP                1
-#define LWIP_TCP_KEEPALIVE      1
+#define LWIP_TCP_KEEPALIVE      0
 #define TCP_KEEPIDLE_DEFAULT    1250
 #define TCP_KEEPINTVL_DEFAULT   1000
 #define TCP_KEEPCNT_DEFAULT     3
