From 19634e34e9c0ceb7338ed948b6737bae09fd672f Mon Sep 17 00:00:00 2001
From: David Cermak <cermak@espressif.com>
Date: Mon, 28 Dec 2020 17:37:03 +0100
Subject: [PATCH] mdns: Fixed the ip header TTL to be correctly set to 255

Defined in https://tools.ietf.org/html/rfc6762#section-11: All Multicast DNS responses (including responses sent via unicast)
   SHOULD be sent with IP TTL set to 255
---
 components/mdns/mdns_networking.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/mdns/mdns_networking.c b/components/mdns/mdns_networking.c
index b7ca2816ee..dd521d81d2 100644
--- a/components/mdns/mdns_networking.c
+++ b/components/mdns/mdns_networking.c
@@ -38,7 +38,7 @@ static esp_err_t _udp_pcb_main_init(void)
         _pcb_main = NULL;
         return ESP_ERR_INVALID_STATE;
     }
-    _pcb_main->mcast_ttl = 1;
+    _pcb_main->mcast_ttl = 255;
     _pcb_main->remote_port = MDNS_SERVICE_PORT;
     ip_addr_copy(_pcb_main->remote_ip, ip_addr_any_type);
     udp_recv(_pcb_main, &_udp_recv, _mdns_server);