From f965034366f774e5ae5e1b9a2b7e292f04605867 Mon Sep 17 00:00:00 2001
From: Dirk Ziegelmeier <dirk@ziegelmeier.net>
Date: Fri, 11 Nov 2016 11:12:54 +0100
Subject: [PATCH] Fix inconsistent return value in udp_sendto_if() - ERR_RTE
 should always be returned when there is no available route

---
 src/core/udp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/udp.c b/src/core/udp.c
index f9aee732..e0ab1863 100644
--- a/src/core/udp.c
+++ b/src/core/udp.c
@@ -662,7 +662,7 @@ udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_i
      * this could be an old address if netif->ip_addr has changed */
     if (!ip4_addr_cmp(ip_2_ip4(&(pcb->local_ip)), netif_ip4_addr(netif))) {
       /* local_ip doesn't match, drop the packet */
-      return ERR_VAL;
+      return ERR_RTE;
     }
     /* use UDP PCB local IP address as source address */
     src_ip = &pcb->local_ip;