Comments on: ESP32 WebSerial: Web-based Remote Serial Monitor

By: Z80

Z80 — Sun, 08 Jun 2025 13:48:46 +0000

Hi Brad,
Did you figure #2 out. Ditto. Can’t seem to print in Setup(). WebSerial.println() placed after server.begin()

void setup() {
Serial.begin(115200);
pinMode(LED, OUTPUT);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
if (WiFi.waitForConnectResult() != WL_CONNECTED) {
Serial.printf(“WiFi Failed!\n”);
return;
}
Serial.print(“IP Address: “);
Serial.println(WiFi.localIP());
// WebSerial is accessible at “/webserial” in browser
WebSerial.begin(&server);
WebSerial.onMessage(recvMsg);
server.begin();
WebSerial.println(“End of Setup()”);
}

By: Dana Knight

Dana Knight — Sat, 01 Mar 2025 14:43:27 +0000

In reply to Sara Santos.

Hi, I am trying to do a simple web serial solution, using no
JSON or Python or HTML, just C/C++ type solution, as if
I were debugging to a terminal session.

After trying a half dozen projects, wading thru all the lib
issues of each project, cryptic errors when I finally can
get a successful compile, a complete failure results in
Rosetta Stone type un translatable errors.

Do you know of or have a solution to this ? Or am I just
dreaming simple string data cannot be sent to web pages,
its all an illusion.

Regards, Dana.

By: Sara Santos

Sara Santos — Mon, 24 Feb 2025 02:25:29 +0000

In reply to Michael.

Hi.
You need to update to the following libraries:

https://rntlab.com/question/solvedassert-failed-tcp_alloc-idf-components-lwip-lwip-src-core-tcp-c1851-required-to-lock-tcpip-core-functionality/

I’ll update all our web server tutorials when I come back to the office.

Regards,
Sara

By: Wim Deblaere

Wim Deblaere — Sun, 23 Feb 2025 09:41:43 +0000

After some trial-and-error, I’ve found that the combination of these specific libraries versions -partially- do the job:
mathieucarbou/AsyncTCP@^3.3.2
mathieucarbou/ESPAsyncWebServer@^3.6.0
ayushsharma82/WebSerial@^2.0.8
As long as you don’t need input from the webSerial interface…
WebSerial.msgCallback(recvMsg) isn’t supported.

By: Michael

Michael — Sat, 22 Feb 2025 15:56:11 +0000

Hi.
After installing your Webserial Sketch on a ESP32, the ESP32 is booting all the time:

IP Address: 192.168.0.35

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

Backtrace: 0x40082489:0x3ffb1fe0 0x4008c321:0x3ffb2000 0x400925d6:0x3ffb2020 0x400f55d3:0x3ffb2150 0x400f574d:0x3ffb2170 0x400d580c:0x3ffb2190 0x400dd2ed:0x3ffb21e0 0x400d2a9a:0x3ffb2200 0x400e13cf:0x3ffb2270 0x4008d06a:0x3ffb2290

ELF file SHA256: 81cdc6e68

Rebooting…
ets Jul 29 2019 12:21:46

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:16492
load:0x40080400,len:4
load:0x40080404,len:3524
entry 0x400805b8

What went wrong ?

rgds
Michael

By: Sara Santos

Sara Santos — Thu, 23 Jan 2025 10:47:28 +0000

In reply to Dave Walmsley.

Hi.
We’ll need to rewrite this tutorial to be compatible with the latest version.
Thanks for your patience.
Regards,
Sara

By: Dave Walmsley

Dave Walmsley — Tue, 21 Jan 2025 21:56:15 +0000

Plus one for a re-write, but I noticed the Github page uses WebSerial.onMessage() and a WebSerial.loop()

By: Sara Santos

Sara Santos — Sat, 18 Jan 2025 18:57:34 +0000

In reply to Ryan.

Hi.
We’ll try to update this tutorial soon.
Regards,
Sara

By: Ryan

Ryan — Fri, 17 Jan 2025 15:38:14 +0000

In reply to Tom. Yeah I came here to say this. I have just wasted many hours trying to make this work before realising that this tutorial is nearly 10 years old and uses completely the wrong libraries. swear words

By: Tom

Tom — Sat, 16 Nov 2024 20:38:51 +0000

This tutorial is great! I have used these concepts in my code to allow a user of the hardware to change EEPROM settings with a cell phone. I am using v1.4.0 . The new version is not usable and really its not clear how to make use of it. The gitHUB info and examples are totally useless. Apparently the various server libs used here don’t work with the v 2.0.8 version. It would be a great service if you guys would update the tutortial to use v 2.0.8 of WebSerial so we can get an idea of what is going on. Thanks for this and all the other great tutorials.