I am trying to communicate between two esp8266 and they are made as two servers, when I communicate using the link 192.168.1.200 from my computer it's all okay also the link 192.168.1.200/p2t and this 'p2t' dose a certain thing within the ESP like turning on LED..
now if I try to use the example of WiFiClient to communicate from one ESP to another which has that server, I can only communicate with the link 192.168.1.200 and I fail with the 192.168.1.200/p2t .
I get
connecting to 192.168.1.202/p2t:80
connection failed
when using p2t
and it's good when I communicate with the 192.168.1.200 and I get:
connecting to 192.168.1.202:80
receiving from remote server
closing connection
how can I achieve that?
here is the default code of the example:
#include <ESP8266WiFi.h>
#ifndef STASSID
#define STASSID "*****"
#define STAPSK "*****"
#endif
const char* ssid = STASSID;
const char* password = STAPSK;
const char* hostest = "192.168.1.202/p2t";
const uint16_t port = 80;
void setup() {
Serial.begin(115200);
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
/* Explicitly set the ESP8266 to be a WiFi-client, otherwise, it by default,
would try to act as both a client and an access-point and could cause
network-issues with your other WiFi-devices on your WiFi-network. */
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void loop() {
static bool wait = false;
Serial.print("connecting to ");
Serial.print(hostest);
Serial.print(':');
Serial.println(port);
// Use WiFiClient class to create TCP connections
WiFiClient client;
if (!client.connect(hostest, port)) {
Serial.println("connection failed");
delay(5000);
return;
}
// Read all the lines of the reply from server and print them to Serial
Serial.println("receiving from remote server");
// not testing 'client.connected()' since we do not need to send data here
while (client.available()) {
char ch = static_cast<char>(client.read());
Serial.print(ch);
}
// Close the connection
Serial.println();
Serial.println("closing connection");
client.stop();
if (wait) {
delay(3000); // execute once every 5 minutes, don't flood remote service
}
wait = true;
}
Thanks for your replay, but I don't know how is that supposed to help me, I said that I can connect to the link 192.168.1.200/p2t when I try to communicate with my laptop or mobile, so I think that the server-side is working, the problem is when I try to communicate with another esp instead of a computer, tho the esp is communicating successfully with 192.168.1.200/ link.
1:My project is based on two servers, this is just a side feature that I need to do, so the needing of HTTP is a must, especially I am using ESP8266WiFi and ESP8266WebServer libraries
2: I tried that example and now it doesn't connect at all nor 192.168.1.200 neither 192.168.1.200/p2t, tho it's connected to the network: the original code:
/**
BasicHTTPClient.ino
Created on: 24.05.2015
*/
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
ESP8266WiFiMulti WiFiMulti;
void setup() {
Serial.begin(115200);
// Serial.setDebugOutput(true);
Serial.println();
Serial.println();
Serial.println();
for (uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] WAIT %d...\n", t);
Serial.flush();
delay(1000);
}
WiFi.mode(WIFI_STA);
WiFiMulti.addAP("****", "**");
}
void loop() {
// wait for WiFi connection
if ((WiFiMulti.run() == WL_CONNECTED)) {
Serial.print("Connected with ip: ");
Serial.print("http://");
Serial.print(WiFi.localIP());
Serial.println("/");
WiFiClient client;
HTTPClient http;
Serial.print("[HTTP] begin...\n");
if (http.begin(client, "192.168.1.202")) { // HTTP
Serial.print("[HTTP] GET...\n");
// start connection and send HTTP header
int httpCode = http.GET();
// httpCode will be negative on error
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
Serial.printf("[HTTP] GET... code: %d\n", httpCode);
// file found at server
if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
String payload = http.getString();
Serial.println(payload);
}
} else {
Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
}
http.end();
} else {
Serial.printf("[HTTP} Unable to connect\n");
}
}
delay(10000);
}
the output
Connected with ip: http://192.168.1.11/
[HTTP] begin...
[HTTP} Unable to connect
Again my server-side is working, and what proves that is I can connect to it with my laptop and mobile phone.
any ideas please.
if you connect WiFiClient it is a TCP socket and it connects to IP and port.
a HTTP request with HttpClient is to URL so http://192.168.1.202/p2t
the HttpClient object parses the URL makes a TCP connection to IP and port (80 for http://) and then sends a HTTP GET request for /p2t in this case
Juraj:
if you connect WiFiClient it is a TCP socket and it connects to IP and port.
a HTTP request with HttpClient is to URL so http://192.168.1.202/p2t
the HttpClient object parses the URL makes a TCP connection to IP and port (80 for http://) and then sends a HTTP GET request for /p2t in this case
Thanks for your explanation, your explanation made me retry that example of HttpClient and it worked, I don't know why it didn't work on the first try when you first told me,
Done, thank you again
