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more lwIP physical interfaces (#6680)
This commit adds W5500 W5100 and ENC28j60 drivers from @njh with credits They are available in libraries/ An example is added in W5500 examples directory plus: * Extract dhcp server from lwip2 and add it to the core as a class. It must always be present, it is linked and can be called by fw on boot. So it cannot be stored in a library. * ethernet: static or dhcp works * PPPServer: example * bring WiFi.config() to the lwIP generic interface (argument reorder common function) * move hostname() from WiFI-STA to generic interface * remove non readable characters from dhcp-server comments * dhcp-server: magic_cookie is part of bootp rfc * fixes from d-a-v/W5500lwIP#17 * enable lwip_hook_dhcp_parse_option() * +ethernet tcp client example in w5500 library examples
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‎cores/esp8266/LwipDhcpServer-NonOS.cpp‎

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/*
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lwIPDhcpServer-NonOS.cpp - DHCP server wrapper
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Copyright (c) 2020 esp8266 arduino. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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// STARTS/STOPS DHCP SERVER ON WIFI AP INTERFACE
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// these functions must exists as-is with "C" interface,
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// nonos-sdk calls them at boot time and later
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#include <lwip/init.h> // LWIP_VERSION
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#include <lwip/netif.h>
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#include "LwipDhcpServer.h"
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extern netif netif_git[2];
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// global DHCP instance for softAP interface
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DhcpServer dhcpSoftAP(&netif_git[SOFTAP_IF]);
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extern "C"
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{
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void dhcps_start(struct ip_info *info, netif* apnetif)
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{
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// apnetif is esp interface, replaced by lwip2's
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// netif_git[SOFTAP_IF] interface in constructor
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(void)apnetif;
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#if 0
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// can't use C++ now, global ctors are not initialized yet
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dhcpSoftAP.begin(info);
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#else
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(void)info;
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// initial version: emulate nonos-sdk in DhcpServer class before
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// trying to change legacy behavor
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// `fw_has_started_softap_dhcps` will be read in DhcpServer::DhcpServer
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// which is called when c++ ctors are initialized, specifically
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// dhcpSoftAP intialized with AP interface number above.
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fw_has_started_softap_dhcps = 1;
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#endif
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}
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void dhcps_stop()
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{
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dhcpSoftAP.end();
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}
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} // extern "C"

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