Using Nano with ESP-01s and sketch that creates a web server to control the On/Off condition of two LEDs, so it is very similar to the issue presented in this thread:
Problems with port forward/accessing an ethernet server from outside the LAN network - Using Arduino / Networking, Protocols, and Devices - Arduino Forum
Here is my sketch in case it helps:
/*
WiFiEsp example: WebServerLed Uses ESP-01s -- cbfb68
A simple web server that lets you turn on and of an LED via a web page.
This sketch will print the IP address of your ESP8266 module (once connected)
to the Serial monitor. From there, you can open that address in a web browser
to turn toggle the LED on pin 12 (Red) or pin 13 (Green) between ON and OFF.
The Red LED will start off ON, Green will be OFF.
For more details see: http://yaab-arduino.blogspot.com/p/wifiesp.html
added by SPL
changed to handle two LEDS
modified IP to be static by changing to 192.168.75.201 vs the IP provided by DHCP
*/
#include "WiFiEsp.h"
// Emulate Serial1 on pins 2/3 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(2,3); // RX, TX
#endif
char ssid[] = "local_sid"; // your network SSID (name)
char pass[] = "password"; // your network password
int status = WL_IDLE_STATUS;
int ledStatus[] = {LOW, LOW};
char *ledColor[] = {"Red", "Green"};
char *ledOnOff[] = {"Off","On"};
int ledPin = 12;
WiFiEspServer server(80);
// use a ring buffer to increase speed and reduce memory allocation
RingBuffer buf(8);
void setup()
{
Serial.begin(9600); // initialize serial for debugging
Serial.println("WebServerTwoLeds");
pinMode(12, OUTPUT); // initialize digital pin
pinMode(13, OUTPUT); // initialize digital pin LED_BUILTIN as an output.
Serial1.begin(9600); // initialize serial for ESP module
WiFi.init(&Serial1); // initialize ESP module
// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true);
}
// attempt to connect to WiFi network
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network
status = WiFi.begin(ssid, pass);
}
Serial.println("You're connected to the network");
printWifiStatus();
// next three lines added to change IP to 192.168.75.201 (make it static) and display the change
Serial.println("Make the IP static - 192.168.75.201");
Serial1.println("AT+CIPSTA=\"192.168.75.201\",\"192.168.75.1\",\"255.255.255.0\"");
printWifiStatus();
// start the web server on port 80
server.begin();
// turn red on to start -- added SPL
toggleLED(12);
}
void loop()
{
WiFiEspClient client = server.available(); // listen for incoming clients
if (client) { // if you get a client,
buf.init(); // initialize the circular buffer
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
buf.push(c); // push it to the ring buffer
// printing the stream to the serial monitor will slow down
// the receiving of data from the ESP filling the serial buffer
// Serial.write(c);
// you got two newline characters in a row
// that's the end of the HTTP request, so send a response
if (buf.endsWith("\r\n\r\n")) {
// Serial.println("got two newline characters");
sendHttpResponse(client);
break;
}
// Check to see if the client request was "GET /H" or "GET /L":
if (buf.endsWith("GET /H")) {
toggleLED(12);
}
else if (buf.endsWith("GET /L")) {
toggleLED(13);
}
else if (buf.endsWith("GET /A")) {
toggleLED(12);
toggleLED(13);
}
}
}
// close the connection
client.stop();
}
}
void sendHttpResponse(WiFiEspClient client)
{
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("<font size=\"10\">");
client.println();
// the content of the HTTP response follows the header:
client.println("<br>");
client.print("<font size=\"10\">");
client.print("Control two LEDs");
client.println("<br>");
client.println("<br>");
client.println("<br>");
client.print("Click <a href=\"/H\">here</a> to turn the Red LED ");
client.print(ledOnOff[!ledStatus[0]]);
client.println("<br>");
client.println("<br>");
client.println("<br>");
client.print("Click <a href=\"/L\">here</a> to turn the Green LED ");
client.print(ledOnOff[!ledStatus[1]]);
client.println("<br>");
client.println("<br>");
client.println("<br>");
client.print("Click <a href=\"/A\">here</a> to toggle both LEDs ");
client.println("<br>");
client.println("<br>");
client.println("<br>");
}
void printWifiStatus()
{
// print the SSID of the network you're attached to
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print where to go in the browser
Serial.println();
Serial.print("To see this page in action, open a browser to http://");
Serial.println(ip);
Serial.println();
}
void toggleLED(int whichLED)
{
if (ledStatus[whichLED-12] == LOW) {
ledStatus[whichLED-12] = HIGH;
digitalWrite(whichLED, HIGH);
}
else {
ledStatus[whichLED-12] = LOW;
digitalWrite(whichLED, LOW);
}
}
=========================
The sketch and hardware setup works fine when the accessing computer is on the same lan. I have tried using port 80 as the OP in the cited thread states fixed his issue. I've also tried port 20619 to no avail also.
I have setup port forwarding on the cable modem/router as shown here:
Using my phone to provide a hotspot so the browser device is external to the local lan, I get "503 Service Temporarily Unavailable" when I try to go to the external IP address of my modem 216.x.x.x with and without ":80" appended to the IP address.
Is there something missing in my sketch to stipulate which port it should be listening to?
Any and all help will be greatly appreciated.
I realize that this is kind of a silly thing to do in the great scheme of things, but I am doing it as a learning lesson.
Thanks in advance.