ESP32 Websockets

Projects General Guidance
1

Hi, looking for simple project to essentially regurgitate the serial data I am sending via
USB-UART to a simple list on a webpage.

Tried ~ 6 different projects, hours of work finding correct libs and their versions,
no success. Got most to compile, none to work due to cryptic messages about reset.

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)

configsip: 0, SPIWP:0xee

clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00

mode:DIO, clock div:1

load:0x3fff0030,len:4916

load:0x40078000,len:16436

load:0x40080400,len:4

ho 8 tail 4 room 4

load:0x40080404,len:3524

entry 0x400805b8

IP Address: 192.168.1.90

assert failed: tcp_alloc /IDF/components/lwip/lwip/src/core/tcp.c:1851 (Required to lock TCPIP core functionality!)

Backtrace: 0x40082475:0x3ffb1fe0 0x4008c2b9:0x3ffb2000 0x4009256e:0x3ffb2020 0x400f4683:0x3ffb2150 0x400f47f9:0x3ffb2170 0x400d5890:0x3ffb2190 0x400dd371:0x3ffb21e0 0x400d2afe:0x3ffb2200 0x400e2297:0x3ffb2270 0x4008d002:0x3ffb2290

/*
  --------------
  WebSerial Demo
  --------------
  
  Skill Level: Beginner

  This example provides with a bare minimal app with WebSerial functionality.

  Github: https://github.com/ayushsharma82/WebSerial
  Wiki: https://docs.webserial.pro

  Works with following hardware:
  - ESP8266
  - ESP32

  WebSerial terminal will be accessible at your microcontroller's <IPAddress>/webserial URL.

  Checkout WebSerial Pro: https://webserial.pro
*/

#include <Arduino.h>
#define ESP32
#if defined(ESP8266)
  #include <ESP8266WiFi.h>
  #include <ESPAsyncTCP.h>
#elif defined(ESP32)
  #include <WiFi.h>
  #include <AsyncTCP.h>
#endif
//#include <ESPAsyncWebSrv.h>
#include <ESPAsyncWebServer.h>
#include <WebSerial.h>

AsyncWebServer server(80);

const char* ssid = ""; // Your WiFi SSID
const char* password = ""; // Your WiFi Password

unsigned long last_print_time = millis();

void setup() {
  Serial.begin(115200);
  delay(100);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  delay(200);
  if (WiFi.waitForConnectResult() != WL_CONNECTED) {
      Serial.printf("WiFi Failed!\n");
      return;
  }
  
  // Once connected, print IP
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
    request->send(200, "text/plain", "Hi! This is WebSerial demo. You can access webserial interface at http://" + WiFi.localIP().toString() + "/webserial");
  });

  // WebSerial is accessible at "<IP Address>/webserial" in browser
  WebSerial.begin(&server);

  /* Attach Message Callback */
  WebSerial.onMessage([&](uint8_t *data, size_t len) {
    Serial.printf("Received %u bytes from WebSerial: ", len);
    Serial.write(data, len);
    Serial.println();
    WebSerial.println("Received Data...");
    String d = "";
    for(size_t i=0; i < len; i++){
      d += char(data[i]);
    }
    WebSerial.println(d);
  });

  // Start server
  server.begin();
}

void loop() {
  // Print every 2 seconds (non-blocking)
  if ((unsigned long)(millis() - last_print_time) > 2000) {
    WebSerial.print(F("IP address: "));
    WebSerial.println(WiFi.localIP());
    WebSerial.printf("Uptime: %lums\n", millis());
    WebSerial.printf("Free heap: %" PRIu32 "\n", ESP.getFreeHeap());
    last_print_time = millis();
  }

  WebSerial.loop();
}

Arduino IDE 2.3.4

Used 2 different ESP modules, checked with scope Vdd stable no wacko glitches on
it. Have used them to run other code.

Any assist greatly appreciated.

2

A Google search for that error message leads you to

which points to

The fix being a downgrade to an older version.

3

This fix, using the "ESP32" named lib from Expressif, and downgraded
to 3.0.7 does work.

Thanks for the help.

Regards, Dana.

4

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