From 16c39aab9e4f19c8dc201365195840dfefc55bd2 Mon Sep 17 00:00:00 2001
From: rogg <rogg@users.noreply.github.com>
Date: Sat, 20 Aug 2022 23:17:05 -0700
Subject: [PATCH] mDNS resolution for *.local fixes #16269

"Add user control over DNS timeout reducing blocking"  https://github.com/arendst/Tasmota/commit/c988ba16451186c55873793978e7730619a25074 created DnsClient so that a timeout can be used to prevent blocking on ESP32, but it can't do one-shot mDNS queries. Use WiFi.hostByName () for those.
---
 tasmota/tasmota_support/support_wifi.ino | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tasmota/tasmota_support/support_wifi.ino b/tasmota/tasmota_support/support_wifi.ino
index 495fe71b8..899733c61 100644
--- a/tasmota/tasmota_support/support_wifi.ino
+++ b/tasmota/tasmota_support/support_wifi.ino
@@ -807,6 +807,17 @@ void wifiKeepAlive(void) {
 #endif  // ESP8266
 
 bool WifiHostByName(const char* aHostname, IPAddress& aResult) {
+  // DnsClient can't do one-shot mDNS queries so use WiFi.hostByName() for *.local
+  size_t hostname_len = strlen(aHostname);
+  if (strstr(aHostname, ".local") == &aHostname[hostname_len] - 6) {
+    if (WiFi.hostByName(aHostname, aResult)) {
+        // Host name resolved
+        if (0xFFFFFFFF != (uint32_t)aResult) {
+            return true;
+        }
+    return false;
+    }
+  }
   // Use this instead of WiFi.hostByName or connect(host_name,.. to block less if DNS server is not found
   uint32_t dns_address = (!TasmotaGlobal.global_state.eth_down) ? Settings->eth_ipv4_address[3] : Settings->ipv4_address[3];
   DnsClient.begin((IPAddress)dns_address);