From 61dac0009953038933f839693c758401136e8580 Mon Sep 17 00:00:00 2001
From: xueyunfei <xueyunfei@espressif.com>
Date: Tue, 31 Mar 2020 19:27:40 +0800
Subject: [PATCH] fix ipv6 bug that input the wrong broadcast address to return
 OK

---
 components/lwip/core/ipv6/mld6.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/components/lwip/core/ipv6/mld6.c b/components/lwip/core/ipv6/mld6.c
index 489c5063a..47c2c791a 100644
--- a/components/lwip/core/ipv6/mld6.c
+++ b/components/lwip/core/ipv6/mld6.c
@@ -322,6 +322,9 @@ mld6_joingroup(const ip6_addr_t *srcaddr, const ip6_addr_t *groupaddr)
   err_t         err = ERR_VAL; /* no matching interface */
   struct netif *netif;
 
+#if ESP_LWIP  
+  LWIP_ERROR("mld6_joingroup: attempt to join non-multicast address", ip6_addr_ismulticast(groupaddr), return ERR_VAL;);
+#endif
   /* loop through netif's */
   netif = netif_list;
   while (netif != NULL) {