ESP8266 and POST request
I have an ESP8266, which I'm programming in Arduino. I need make a POST request. I tried this code:
#include <ESP8266HTTPClient.h>
#include <ESP8266WiFi.h>
void setup() {
Serial.begin(115200); //Serial connection
WiFi.begin("ssid", "wifi_password"); //WiFi connection
while (WiFi.status() != WL_CONNECTED) { //Wait for the WiFI connection completion
delay(500);
Serial.println("Waiting for connection");
}
}
void loop() {
if(WiFi.status()== WL_CONNECTED){ //Check WiFi connection status
HTTPClient http; //Declare object of class HTTPClient
http.begin("server_name"); //Specify request destination
http.header("POST / HTTP/1.1");
http.header("Host: server_name");
http.header("Accept: */*");
http.header("Content-Type: application/x-www-form-urlencoded");
int httpCode = http.POST("Message from ESP8266"); //Send the request
String payload = http.getString();
Serial.println(httpCode); //Print HTTP return code
Serial.println(payload); //Print request response payload
http.end(); //Close connection
}else{
Serial.println("Error in WiFi connection");
}
delay(5000); //Send a request every 30 seconds
}
But on the web page I did not receive any response.
Answer
I found this code and it works!
#include <ESP8266WiFi.h>
const char* ssid = "ssid";
const char* password = "password";
const char* host = "server_name";
void setup() {
Serial.begin(115200);
delay(100);
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
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() {
WiFiClient client;
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
String data = "pst=temperature>" + String(random(0,100)) +"||humidity>" + String(random(0,100)) + "||data>text";
Serial.print("Requesting POST: ");
// Send request to the server:
client.println("POST / HTTP/1.1");
client.println("Host: server_name");
client.println("Accept: */*");
client.println("Content-Type: application/x-www-form-urlencoded");
client.print("Content-Length: ");
client.println(data.length());
client.println();
client.print(data);
delay(500); // Can be changed
if (client.connected()) {
client.stop(); // DISCONNECT FROM THE SERVER
}
Serial.println();
Serial.println("closing connection");
delay(5000);
}
Thank you very much for your help.