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RangeExtender-NAPT.ino
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RangeExtender-NAPT.ino
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// NAPT example released to public domain
#if LWIP_FEATURES && !LWIP_IPV6
#define HAVE_NETDUMP 0
#ifndef STASSID
#define STASSID "mynetwork"
#define STAPSK "mynetworkpassword"
#endif
#include <ESP8266WiFi.h>
#include <lwip/napt.h>
#include <lwip/dns.h>
#define NAPT 1000
#define NAPT_PORT 10
#if HAVE_NETDUMP
#include <NetDump.h>
void dump(int netif_idx, const char* data, size_t len, int out, int success) {
(void)success;
Serial.print(out ? F("out ") : F(" in "));
Serial.printf("%d ", netif_idx);
// optional filter example: if (netDump_is_ARP(data))
{
netDump(Serial, data, len);
// netDumpHex(Serial, data, len);
}
}
#endif
void setup() {
Serial.begin(115200);
Serial.printf("\n\nNAPT Range extender\n");
Serial.printf("Heap on start: %d\n", ESP.getFreeHeap());
#if HAVE_NETDUMP
phy_capture = dump;
#endif
// first, connect to STA so we can get a proper local DNS server
WiFi.mode(WIFI_STA);
WiFi.begin(STASSID, STAPSK);
while (WiFi.status() != WL_CONNECTED) {
Serial.print('.');
delay(500);
}
Serial.printf("\nSTA: %s (dns: %s / %s)\n", WiFi.localIP().toString().c_str(), WiFi.dnsIP(0).toString().c_str(), WiFi.dnsIP(1).toString().c_str());
// By default, DNS option will point to the interface IP
// Instead, point it to the real DNS server.
// Notice that:
// - DhcpServer class only supports IPv4
// - Only a single IP can be set
auto& server = WiFi.softAPDhcpServer();
server.setDns(WiFi.dnsIP(0));
WiFi.softAPConfig( // enable AP, with android-compatible google domain
IPAddress(172, 217, 28, 254), IPAddress(172, 217, 28, 254), IPAddress(255, 255, 255, 0));
WiFi.softAP(STASSID "extender", STAPSK);
Serial.printf("AP: %s\n", WiFi.softAPIP().toString().c_str());
Serial.printf("Heap before: %d\n", ESP.getFreeHeap());
err_t ret = ip_napt_init(NAPT, NAPT_PORT);
Serial.printf("ip_napt_init(%d,%d): ret=%d (OK=%d)\n", NAPT, NAPT_PORT, (int)ret, (int)ERR_OK);
if (ret == ERR_OK) {
ret = ip_napt_enable_no(SOFTAP_IF, 1);
Serial.printf("ip_napt_enable_no(SOFTAP_IF): ret=%d (OK=%d)\n", (int)ret, (int)ERR_OK);
if (ret == ERR_OK) { Serial.printf("WiFi Network '%s' with same password is now NATed behind '%s'\n", STASSID "extender", STASSID); }
}
Serial.printf("Heap after napt init: %d\n", ESP.getFreeHeap());
if (ret != ERR_OK) { Serial.printf("NAPT initialization failed\n"); }
}
#else
void setup() {
Serial.begin(115200);
Serial.printf("\n\nNAPT not supported in this configuration\n");
}
#endif
void loop() {}