WebSocket works on PC's Chrome but wont on Android's Chrome.

[aguaviva]

First off, thanks for this amazing project :) Thanks to it I was able to build a sous vide controller.

https://github.com/aguaviva/SousVide

It turns out that it works fine on PC

but on my mobile and my tablet I get this:

The main.cpp file in my github repo shows how am I using the websockets.

In the setup() I init the websockets like this:

ws.onEvent([](AsyncWebSocket * server, AsyncWebSocketClient * client, AwsEventType type, void * arg, uint8_t *data, size_t len)
{
  if(type == WS_EVT_CONNECT)
  {
      Serial.printf("ws[%s][%u] connected\n", server->url(), client->id());
      client->ping();
      websocketsOnConnect(client);
  }
  else if(type == WS_EVT_DISCONNECT)
  {
      Serial.printf("ws[%s][%u] disconnected\n", server->url(), client->id());
  }
});
server.addHandler(&ws);

and in the loop() I do something like this:

    if (DataStreamer.tick())
    {
        STATE st = { (float)Temperature, (float)Power };
        histData.Queue(st);

        ws.binaryAll((char*)&st, sizeof(STATE));
    }

Any ideas what could be going on? I'll be happy to test any experiments you may want me to test.

[omersiar]

I also encountered that issue. In my case Android Chrome did not get lengthy messages (i tried only plain text) so I reduced the plain text length, and it worked. I do not know if there is limit. Chrome dev team should be contacted I guess.

[aguaviva]

Other ESP websocket libs are working fine on android. It might be an issue of this lib.

[aguaviva]

@me-no-dev I'm very gently bumping this in case you missed that WebSockets are not working on Android. Also please add my project to the list of projects featuring your great lib.

[me-no-dev]

huh... can you please collect some more logs to establish a pattern? I see in the images above that 1 more byte is received on the tablet than on the PC.

[nicbkw]

Hi @me-no-dev - also seeing this issue. I copied some of your example code and made it work on the Heltec-LoRa module. When configured as WiFi.mode(WIFI_AP_STA) I cannot access the website from either android browsers or IOS browsers. When configured as WiFi.softAP, access is OK from all browsers. Here is the relevant part of the code:

  WiFi.mode(WIFI_AP_STA);
  //WiFi.softAP(hostName);
  WiFi.begin(ssid, password);
  if (WiFi.waitForConnectResult() != WL_CONNECTED) {
    Serial.printf("STA: Failed!\n");
    u8x8.drawString(0, 1, "STA: Failed!");
    WiFi.disconnect(false);
    delay(1000);
    WiFi.begin(ssid, password);
  }

[me-no-dev]

OooOoooOO what? So AP is somehow breaking it? What if only in AP mode?

[nicbkw]

;-) not tried it - will do so now...

[nicbkw]

Same issue with WiFi.mode(WIFI_STA). Android browser actually shows ERR_ADDRESS_UNREACHABLE. Works fine with Chrome on Mac. My Mac and PC are connected over ethernet. iPad and Android phone via WiFi from same network. Android phone can reach the router and display its webpage no problem.

[me-no-dev]

so to recap, it's working only in WIFI_AP mode? That so does not make sense...

[nicbkw]

This works fine, no other changes - using the ESP32 WiFi AP I can connect with both Android phone and iPad to the webserver at 192.168.4.1

  //WiFi.mode(WIFI_STA);
  WiFi.softAP(ssid, password);
  //WiFi.begin(ssid, password);
  //if (WiFi.waitForConnectResult() != WL_CONNECTED) {
    //Serial.printf("STA: Failed!\n");
    //u8x8.drawString(0, 1, "STA: Failed!");
    //WiFi.disconnect(false);
    //delay(1000);
    //WiFi.begin(ssid, password);
  //}

  u8x8.setCursor(0, 2);
  u8x8.print(WiFi.softAPIP());

[nicbkw]

FYI - I am compiling the sketch using the arduino-esp32 from espressif and made a fresh install yesterday from https://github.com/espressif/arduino-esp32

[Pablo2048]

I'm using websockets in my project on Android device without problem (WIFI_STA mode, little bit older version of core), but this seems like problem with ip addressing to me. Can you please turn on delevoper console on your browser and check, where your application tries to connect to?

[nicbkw]

Does this help? Chrome browser on my Mac:

[nicbkw]

Apologies, hit commit too soon - here is the android phone in remote dev mode on the same Chrome browser:

[Pablo2048]

Hmm, but this seems like problem somewhere inside routing or DNS/getHostByName - looks like the phone can't connect to 192.168.1.170 even with ordinary http request...