LEAmDNS - Multicast DNS Responder (#5442)

* LEAmDNS Responder (II)

Created a new branch to solve commit conflicts with recent changes to ESP8266mDNSResponder.cpp by d-a-v.

* Removed millis() roll-over issues

* fix LEA-mDNS

* astyle on lea-mdns examples

* add compatibility with lwIP-v1

* ditto

* use strncasecmp instead of lwip's strnicmp from lwIP-v2 (thanks @devyte)

* ditto

* fixes

* Update mDNS_Clock.ino

unindent

* Update mDNS_ServiceMonitor.ino

unindent

* Update LEAmDNS.h

Add setInstanceName() forwarder for compat

* Disable DEBUG_ESP_MDNS_RESPONDER by default

* [Fixed] Debug output line

DEBUG_OUTPUT needs to go inside DEBUG_EX_ function otherwise throw error if DEBUG_ESP_MDNS_RESPONDER is not defined

libraries/ESP8266mDNS/src/ESP8266mDNS.h

@@ -0,0 +1,49 @@
+/*
+  ESP8266mDNS.h - mDNSResponder for ESP8266 family
+  This file is part of the esp8266 core for Arduino environment.
+
+  Legacy_ESP8266mDNS:
+  The well known, thouroughly tested (yet no flawless) default mDNS library for the ESP8266 family
+
+  LEA_ESP8266mDNS:
+  An (currently) experimental mDNS implementation, that supports a lot more of mDNS features than Legacy_ESP8266mDNS, like:
+  - Presenting a DNS-SD service to interested observers, eg. a http server by presenting _http._tcp service
+  - Support for multi-level compressed names in input; in output only a very simple one-leven full-name compression is implemented
+  - Probing host and service domains for uniqueness in the local network
+  - Tiebreaking while probing is supportet in a very minimalistic way (the 'higher' IP address wins the tiebreak)
+  - Announcing available services after successful probing
+  - Using fixed service TXT items or
+  - Using dynamic service TXT items for presented services (via callback)
+  - Remove services (and un-announcing them to the observers by sending goodbye-messages)
+  - Static queries for DNS-SD services (creating a fixed answer set after a certain timeout period)
+  - Dynamic queries for DNS-SD services with cached and updated answers and user notifications
+  - Support for multi-homed client host domains
+
+  See 'LEA_ESP8266mDNS/EPS8266mDNS.h' for more implementation details and usage informations.
+  See 'examples/mDNS_Clock' and 'examples/mDNS_ServiceMonitor' for implementation examples of the advanced features.
+
+  LEA_ESP8266mDNS is (mostly) client source code compatible to 'Legacy_ESP8266mDNS', so it could be
+  use as a 'drop-in' replacement in existing projects.
+
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+*/
+
+#include "ESP8266mDNS_Legacy.h"
+#include "LEAmDNS.h"
+
+using namespace Legacy_MDNSResponder;
+//using namespace LEAmDNS;