Sending String via HTTP using ESP32

Projects General Guidance
1

So I've got ESP32 acting as a server and I want it to receive String from client, the client code is written in python

import requests
r = requests.post(url="http://192.168.0.101:7777",data = b"HELLO ESP32")
print(r.text)

and the code running on ESP32 is following:

#include <WiFi.h>
#include <HTTPClient.h>
#include <WebServer.h>

WebServer server(7777);
HTTPClient http;

const char* ssid = "SSID";
const char* password =  "PASS";

void handleRoot() {
  server.send(200, "text/plain", "Hello World!");
}

void handleNotFound() {
  server.send(404, "text/plain", "Didn't find me bro!");
}

void setup() {
  Serial.begin(115200);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.println("Connecting to WiFi..");
  }
  Serial.println(WiFi.localIP());

  server.on("/", handleRoot);
  server.onNotFound(handleNotFound);
  server.begin();
  http.begin("http://192.168.0.101/7777");
}

void loop() {
 server.handleClient();
 int httpCode = http.GET();
 String payload = http.getString();
 Serial.println(httpCode);
 Serial.println(payload);
}

In the python console I can clearly see that the server exists and I succeeded in finding it since the output of the print is Hello World!
But on the ESP32 I didn't receive anything, thanks for your help!

2

Your webserver needs to handle the POST from your python code which it does by calling the function handleRoot(). But this function just returns the plain text "Hello World". If you want that function to handle the POST, you will need to read the data associated witht the POST and display it.

You can remove all the HTTPClient stuff you have scattered around. That is making your server request data from itself.