I'm trying to get one esp to send integers to a second as a part of a simple remote control, but after multiple days I can't get it to work. The transmitter seems like it's connecting and sending properly as best I can tell, and the receiver is sending some kind of response, but the function I attached with server.on() never gets called.
The code is basically copy and pasted from a tutorial, the only thing I changed was removing code to display the read data to an LCD and display to serial instead.
This is the receiver's code.
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
const char ssid = "controllerReceiver";
const char password = "password";
ESP8266WebServer server(80);
void setup() {
Serial.begin(115200);
WiFi.softAP(ssid, password);
IPAddress myIP = WiFi.softAPIP();
server.on("/data/", HTTP_GET, handleSentVar);
server.begin();
Serial.println("server online");
}
void loop() {
server.handleClient();
}
void handleSentVar() {
Serial.println("Handling");
if (server.hasArg("x_value")) { // this is the variable sent from the client
int readingInt = server.arg("x_value").toInt();
Serial.println(readingInt);
server.send(200, "text/html", "Data received");
}
}
And here is the transmitter
#include <ESP8266WiFi.h>
const char ssid = "controllerReceiver";
const char password = "password";
int outputValue = 999;
void setup() {
Serial.begin(115200);
delay(10);
// Explicitly set the ESP8266 to be a WiFi-client
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
Serial.println("connecting...");
delay(500);
}
}
void loop() {
char intToPrint[5];
itoa(outputValue, intToPrint, 10); //integer to string conversion for OLED library
// Use WiFiClient class to create TCP connections
WiFiClient client;
const char * host = "192.168.4.1";
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
// We now create a URI for the request. Something like /data/?sensor_reading=123
String url = "/data/";
url += "x_value=";
url += intToPrint;
// This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
unsigned long timeout = millis();
while (client.available() == 0) {
if (millis() - timeout > 5000) {
Serial.println(">>> Client Timeout !");
client.stop();
return;
}
}
}
