Internet does not work on esp32, when distributing wifi from mobile data (android), but in other cases it works

Official Hardware MKR Family MKR WiFi 1010
1

Why when connecting to the wifi access point of the phone (android), http.POST returns -1, although there is Internet and everything is fine when connected to the home network, and also when the phone is a repeater from the home network to its own network, which it distributes, everything also works , stops working (giving HTTPC_ERROR_CONNECTION_REFUSED (-1)) when trying to reach the server (tried on different ones, httpbin is one of them) when the phone acts as a wifi access point, using mobile data, and other devices connected to this network work correctly, here diagnostic output

IP address:
192.168.81.157
Mode: STA
Channel: 2
SSID (3): ssid
Passphrase (8): password
BSSID set: 0
httpCode: -1

#include <Arduino.h>

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


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  WiFi.begin("ssid", "password");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  WiFi.printDiag(Serial);
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());


  WiFiClient client;
  HTTPClient http;

  if (http.begin(client, "http://httpbin.org/post")) {
    http.addHeader("Content-Type", "application/json");

    int httpCode = http.POST("{\"my_json\":1}");
    if (httpCode > 0) {
      if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
        Serial.println(http.getString());
      }
    }
    http.end();
    Serial.println("httpCode: "+String(httpCode));
  }
}

void loop() {
  // put your main code here, to run repeatedly:

}

I also ran ifconfig on this phone, maybe that will help (termux)

ifconfig
Warning: cannot open /proc/net/dev (Permission denied). Limited output.
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)

rmnet_data1: flags=65<UP,RUNNING>  mtu 1404
        inet 192.0.0.2  netmask 255.255.255.224
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)

wlan1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.81.205  netmask 255.255.255.0  broadcast 192.168.81.255
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 3000  (UNSPEC)
2

Does the phone have a proxy server that you need to route through?

3

I unfortunately don't know how to check this, if you can tell me I will be happy to check, here is also the output from ubuntu which I used to connect to this network

ifconfig

enp3s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 3c:7c:3f:d4:73:c9  txqueuelen 1000  (Ethernet)
        RX packets 423413  bytes 390895992 (390.8 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 352721  bytes 47413345 (47.4 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Локальна петля (Loopback))
        RX packets 11854  bytes 4163007 (4.1 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 11854  bytes 4163007 (4.1 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlx002e2d30430f: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.81.221  netmask 255.255.255.0  broadcast 192.168.81.255
        inet6 2a02:2378:119f:9ca0:aebb:1791:6c9d:1fd6  prefixlen 64  scopeid 0x0<global>
        inet6 2a02:2378:119f:9ca0:e63f:1b15:d7cb:5223  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::531f:5c4a:cda4:f7a9  prefixlen 64  scopeid 0x20<link>
        ether 00:2e:2d:30:43:0f  txqueuelen 1000  (Ethernet)
        RX packets 8404  bytes 6081332 (6.0 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7430  bytes 1462928 (1.4 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I also noticed that if I start the server on flask (python) in termux, it receives requests from esp32, it appears at 192.0.0.2
Here is the flask server output

* Serving Flask app 'main'
 * Debug mode: off
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on all addresses (0.0.0.0)
 * Running on http://127.0.0.1:8080
 * Running on http://192.0.0.2:8080
4

It could be a 2.4GHz / 5 GHz issue. The ESP devices do not support the 5GHz radio frequency (yet?).

5

No, it works purely on 2.4G

6

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