From ab3fa69b8fb8ec2f8065d78f7fa1f7d819459172 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


* Original commit: espressif/esp-idf@5cce919cbef87f543bb9f5275b77b97b3b1ea67e
---
 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 152ab2798..48d11918b 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_ANY_TYPE));
     udp_recv(_pcb_main, &_udp_recv, _mdns_server);