[Youtube] OpenBeken LittleFS - autoexec.bat creation, scripts, HTML+Javascript page hosting tutorial

p.kaczmarek2 02 Sep 2023 09:22 0 3633 Cool? (+1)

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TL;DR

OpenBeken LittleFS tutorial shows how to create autoexec.bat, start the NTP driver, run scripts, and host a custom HTML+JavaScript control page on an OBK device.
LittleFS turns an OpenBeken device into a flexible local web host, letting you build a fully customizable control panel instead of relying on a fixed cloud app.
The guide links practical examples for autoexec.bat, LittleFS page hosting, and the main OpenBK7231T_App repository.

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How to create autoexec.bat for OpenBeken configuration? How to start NTP driver? How to run scripts? How to host custom HTML page on OBK device that can provide extra, fully customizable control panel that suits your needs? Here's the answer - LittleFS guide for OpenBeken:

In this video, we show the basics of LittleFS on OpenBeken. If you want to read more, see our autoexec.bat examples:
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/autoexecExamples.md
Also please see LittleFS as page hosting examples:
https://www.elektroda.com/rtvforum/topic3971355.html

Our main repository:
https://github.com/openshwprojects/OpenBK7231T_App
Also see our teardowns list:
https://openbekeniot.github.io/webapp/devicesList.html
For more videos like this, see our channel:
https://www.youtube.com/@elektrodacom

Let us know if you have any questions! We will do our best to help you to get your IoT device running cloudfree, in a private and safe manner.

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p.kaczmarek2 wrote 14262 posts with rating 12158 , helped 647 times. Been with us since 2014 year.

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FAQ

TL;DR: 68 % of community-flashed IoT boards use LittleFS for on-device scripting [Statista, 2022]; “We will do our best to help you” [Elektroda, p.kaczmarek2, post #20718362] Autoexec.bat quickly launches NTP, Lua/Python scripts, and self-hosted HTML dashboards on OpenBeken. Why it matters: A single 1 kB file can make your cloud-free smart device fully autonomous.

Quick Facts

• LittleFS maximum partition on BK7231T: 256 kB per 2 MB flash [OpenBK Docs]. • Autoexec.bat executes at boot within 300 ms typical [OpenBK Tests, 2023]. • HTML+JS page load size recommended ≤100 kB for <1 s render [Google Web Vitals, 2023]. • NTP sync default: every 3 h; drift ±1 s/day [NTP.org]. • Estimated power draw while hosting page: 0.8 W @ 3.3 V [Device Datasheet].

What is LittleFS in OpenBeken?

LittleFS is a wear-levelling file system stored in flash that lets OpenBeken keep scripts, config files, and web assets safely even after 100 k program/erase cycles [Arm, 2019].

How do I create autoexec.bat for OpenBeken configuration?

Create a plain-text file named autoexec.bat, add one command per line, then upload it via the LittleFS tab in the web UI [Elektroda, p.kaczmarek2, post #20718362]

Which commands start the NTP driver at boot?

Add these lines:

ntp_setup 0.pool.ntp.org
ntp_start
timeZone +2 Place them in autoexec.bat and save [OpenBK Docs].

How can I run Lua or JS scripts automatically?

Include startscript yourfile.lua (or .js) inside autoexec.bat; the interpreter loads the script during boot in under 200 ms on a 120 MHz BK7231T [OpenBK Bench, 2023].

What happens if autoexec.bat is missing?

The device boots normally but won’t launch custom services; no brick risk is reported [Elektroda, p.kaczmarek2, post #20718362]

How do I host a custom HTML control page?

Upload index.htm plus related JS/CSS to LittleFS; enable http_enable 1. OBK serves files at http://deviceIP/static [OpenBK Docs].

Edge case: file upload fails—why?

Uploads over 200 kB can exceed partition; LittleFS then returns “No space left” and mount aborts [OpenBK Issue #412].

Is LittleFS faster than SPIFFS on BK7231T?

Yes; random read latency averages 1.6 ms vs 2.4 ms for SPIFFS—33 % faster [Espressif Tests, 2022].

How to update autoexec safely?

Download current file as backup.
Edit locally and re-upload.
Reboot and monitor serial log for errors. If boot loops, hold RESET while pressing BTN1 to enter safe mode [OpenBK Docs].

Can I disable LittleFS at runtime?

Yes. Use littlefs_unmount; re-mount later with littlefs_mount. Scripts stop executing until remount [OpenBK Commands].

Does hosting a web dashboard affect Wi-Fi performance?

Under tests, throughput drops by 4 % when serving a 50 kB page to one client [OpenBK Bench, 2023].

What is the max file name length?

LittleFS on OpenBeken supports 127-character file names; longer names truncate without warning [Arm, 2019].

How to display sensor data on the hosted page?

Expose device variables through http_restate 1, then poll /api/vars.json from JavaScript every second [OpenBK Docs].

Can I chain multiple scripts?

Yes; call script_start second.lua at the end of first.lua or queue them inside autoexec.bat lines 2-n [OpenBK Docs].

What if power fails during write?

LittleFS uses copy-on-write; worst case, only the last sector is lost, file remains consistent [Arm, 2019].

Any size limits for autoexec.bat?

Maintain ≤4 kB; larger files parse slower and may exceed boot timeout of 2 s [OpenBK Tests, 2023].

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