Adafruit Feather HUZZAH (ESP8266) - WiFi Network issues

Projects Programming
1

I have two Adafruit Feather HUZZAH modules which I am programming with the Arduino IDE.

The goal is to send sensor data from clients to a display on a server.

I have achieved a WiFi connection between the two, but have been unable to receive a response from a request. The image below shows a blank after the "Response: " following a successful connection and request.

I am expecting to receive the text "response" from my server, as it should hear the request from the client and reply. It does not seem to be doing this, but I am not sure whether this is because I am mis-using the WiFiClient functions or not - TCP/IP and HTML is new to me. I have been using this code here.

Here is the code for my server:

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>

#ifndef APSSID
#define APSSID "SensorNet"
#define APPSK  "ATEC123456"
#endif

const char *ssid = APSSID;
const char *password = APPSK;

ESP8266WebServer server(80);

void handleRoot() {
  server.send(200, "text/html", "<h1>You are connected</h1>");
}

void setup() {
  delay(1000);
  Serial.begin(115200);
  Serial.println();
  Serial.print("Configuring access point...");
  WiFi.softAP(ssid, password);

  IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);
  server.on("/", handleRoot);
  server.begin();
  Serial.println("HTTP server started");
}

void loop() {
  
  WiFiClient client;
  if (client && client.connected()) {
  String request = client.readStringUntil('\n');
  Serial.println(request);
  client.print("response\n");
  client.stop();
}
}

Here is the code from my client:

#include <ESP8266WiFi.h>
#include <WiFiClient.h>

#ifndef STASSID
#define STASSID "your-ssid"
#define STAPSK  "your-password"
#endif

const char* ssid     = "SensorNet";
const char* password = "ATEC123456";

const char* host = "192.168.4.1";
const uint16_t port = 80;
const int led = 0;
const int led2 = 2;

void setup() {
  Serial.begin(115200);
  
  // We start by connecting to a WiFi network
  digitalWrite(led, 1);
  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) {
    Serial.print(".");
    delay(500);
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  digitalWrite(led2, 0);
  Serial.println(WiFi.localIP());
}

void loop() {
  Serial.print("connecting to ");
  Serial.print(host);
  Serial.print(':');
  Serial.println(port);

  // Use WiFiClient class to create TCP connections
  WiFiClient client;
  if (!client.connect(host, port)) {
    Serial.println("connection failed");
    delay(5000);
    return;
  }


if (client.connected()) {
  client.print("request\n");
  delay(100);
  String response = client.readStringUntil('\n');
  Serial.println("Response: ");
  Serial.print(response);
  client.stop();
}

  delay(10000); // execute once every 5 minutes, don't flood 
}
2

where is server.available() ?

3

Juraj:
where is server.available() ?

I removed this from the void loop() of the server code a while ago - didnt seem to be doing anything. Was this a mistake?

EDIT: I just tried to re-add it and got an error:

'class ESP8266WebServer' has no member named 'available'

4

you mixed the WebServer example with WiFiServer example

5

Did i? I used the sample ESP8266 WifiAccessPoint:

/* Create a WiFi access point and provide a web server on it. */

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>

#ifndef APSSID
#define APSSID "ESPap"
#define APPSK  "thereisnospoon"
#endif

/* Set these to your desired credentials. */
const char *ssid = APSSID;
const char *password = APPSK;

ESP8266WebServer server(80);

/* Just a little test message.  Go to http://192.168.4.1 in a web browser
   connected to this access point to see it.
*/
void handleRoot() {
  server.send(200, "text/html", "<h1>You are connected</h1>");
}

void setup() {
  delay(1000);
  Serial.begin(115200);
  Serial.println();
  Serial.print("Configuring access point...");
  /* You can remove the password parameter if you want the AP to be open. */
  WiFi.softAP(ssid, password);

  IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);
  server.on("/", handleRoot);
  server.begin();
  Serial.println("HTTP server started");
}

void loop() {
  server.handleClient();
}
6

bushwookie:
Did i? I used the sample ESP8266 WifiAccessPoint:

/* Create a WiFi access point and provide a web server on it. */

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>

#ifndef APSSID
#define APSSID "ESPap"
#define APPSK  "thereisnospoon"
#endif

/* Set these to your desired credentials. */
const char *ssid = APSSID;
const char *password = APPSK;

ESP8266WebServer server(80);

/* Just a little test message.  Go to http://192.168.4.1 in a web browser
  connected to this access point to see it.
*/
void handleRoot() {
  server.send(200, "text/html", "

You are connected

");
}

void setup() {
  delay(1000);
  Serial.begin(115200);
  Serial.println();
  Serial.print("Configuring access point...");
  /* You can remove the password parameter if you want the AP to be open. */
  WiFi.softAP(ssid, password);

IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);
  server.on("/", handleRoot);
  server.begin();
  Serial.println("HTTP server started");
}

void loop() {
  server.handleClient();
}

yes. you have loop() from the WiFiServer example, so you don't call server.handleClient(); of the ESP8266WebServer library