[BK7231T] My HTTP server, configurator, MQTT support from Home Assistant

p.kaczmarek2 180192 1264

Treść została przetłumaczona

Zobacz oryginalną wersję tematu

Reply Cool? Ranking DIY | New topic

Notify about new articles

#1261 21615283 23 Jul 2025 23:04

insmod insmod

Level 25

Helpful post? (0)

Post #1261
21615283 23 Jul 2025 23:04

[postid:e8642bd1d4][/postid:e8642bd1d4]
For LN882H it doesn't matter what wifi lib, i've just had to add ln_wpa_sae_enable() to connect HAL.
Mixed mode doesn't matter. If WPA3 is supported - it will connect via WPA3. If not - WPA2.
Since AmebaDplus supports WPA3, then AmebaLite supports it too.
On ESP32 WPA3 is disabled. Can be enabled if CONFIG_ESP_WIFI_ENABLE_WPA3_SAE is set to y in sdkconfig.defaults (do not enable OWE - we don't need it)
I see that on ESP8266 ESP8266_WIFI_ENABLE_WPA3_SAE is enabled by default. If disabled - more free heap will be available.
ADVERTISEMENT
#1262 21615293 23 Jul 2025 23:21

divadiow divadiow

Level 35

Helpful post? (0)

Post #1262
21615293 23 Jul 2025 23:21

insmod wrote:
For LN882H it doesn't matter what wifi lib, i've just had to add ln_wpa_sae_enable() to connect HAL.

ah ok ok. cool.
insmod wrote:
On ESP32 WPA3 is disabled. Can be enabled if CONFIG_ESP_WIFI_ENABLE_WPA3_SAE is set to y in sdkconfig.defaults (do not enable OWE - we don't need it)

OK. I don't need WPA3 specifically, but was testing what works in general release.

insmod wrote:
I see that on ESP8266 ESP8266_WIFI_ENABLE_WPA3_SAE is enabled by default. If disabled - more free heap will be available.

I'll do it again, but it didn't connect, so...

Are there any in platforms.md I should try that you're definitely unsure about?
ADVERTISEMENT
#1263 21615303 23 Jul 2025 23:30

insmod insmod

Level 25

Helpful post? (0)

Post #1263
21615303 23 Jul 2025 23:30

>>21615293
Unsure about realteks and ecr.
For esp8266, in kconfig it states about configuring pmf before connecting, but nothing about it in examples.
Potential fix: https://docs.espressif.com/projects/esp-faq/e...f-esp-idf-how-to-support-wpa3-encryption-mode
ADVERTISEMENT
#1264 21616220 24 Jul 2025 22:22

divadiow divadiow

Level 35

Helpful post? (+1)

Post #1264
21616220 24 Jul 2025 22:22

ESP8266 WPA3 is a no
#1265 21616549 25 Jul 2025 11:02

divadiow divadiow

Level 35

Helpful post? (0)

Post #1265
21616549 25 Jul 2025 11:02

p.kaczmarek2 wrote:
Looks like another BK7231N renamed as T1, I am trying to ask user to take a boot log.

isn't T1 BK7238 and T2 is BK7231N?

Added after 7 [minutes]:

T1 bootloader from Tuya T1 SDK booting on NiceMCU BK7238

Code: Text
Log in, to see the code

Added after 1 [minutes]:
Create an account, log in and become active in a forum and ads will not appear. You will receive points by participating in discussions.
Join this discussion.

Install the application

Reply Cool? Ranking DIY | New topic

Notify about new articles

Report a violation of the law

Topic summary

The discussion centers on the development and testing of an open-source firmware project for the BK7231T microcontroller, focusing on creating a cross-platform mini HTTP server, web-based pin configuration, MQTT integration, and Home Assistant compatibility. The project includes a Visual Studio project for Windows and firmware flashing tools like Beken Writer and a Python-based uartprogram. Users report challenges with flashing devices, including issues with firmware size limits (956KB), UART converter compatibility, and power supply stability during flashing. Solutions include using specific UART adapters (e.g., FT232R, CP2102), resetting devices via the CEN pin instead of power cycling, and trimming firmware binaries. The firmware supports devices with BK7231T and BK7231N chips, with ongoing work to add PWM dimmer support, BLE, TuyaMCU protocol integration, and OTA updates. Various smart devices such as WB2S/WB3S modules, smart plugs, LED bulbs, and switches from brands like MOES, Nedis, Hama, and Calex are tested. Users share detailed hardware teardowns, pinouts, and flashing procedures. MQTT topic naming issues related to MAC address usage were identified and fixed. The project emphasizes community collaboration, with suggestions for a Discord server to enhance real-time communication. Additional tools and SDK improvements, including CMake support and BLE integration, are under development to facilitate firmware building and device support expansion.
Summary generated by the language model.

FAQ

TL;DR: 100 % flash-success reported on BK7231 T/N modules [Elektroda, p.kaczmarek2, post #19906676]; “OpenBK7231T now boots on three chip families” [Elektroda, p.kaczmarek2, post #19883071] Use QIO image for BK7231N, UA for BK7231T; erase only 0×11000-0×1EF000. Why it matters: a single workflow now replaces vendor firmware on 60 + low-cost IoT boards.

Quick Facts

• Supported MCUs: BK7231T, BK7231N, XR809 (Wi-Fi + BLE) [Elektroda, 19883071]
• Recommended UART speed: 921 600 bps for write, 115 200 bps for read [Elektroda, 19857664]
• Flash sizes: Typical 2 MB on-chip; config area starts @ 0×1EF000 [Elektroda, 19893493]
• OTA format: .rbl (gzip + AES, served by HTTP) [Elektroda, btsimonh, post #19880525]
• Typical power: 5 V @ 500 mA to AMS1117 input for safe programming [Elektroda, ExploWare, post #19853546]

1. Which OpenBK binary should I flash?

• BK7231T/ WB2S/WB3S – use UA.bin via UART bootloader. • BK7231N/ CB2S/CB3S – use QIO.bin at offset 0×0 with –unprotect flag [Elektroda, p.kaczmarek2, post #19890168] • XR809 – build sharedApp and burn with PhoenixMC [Elektroda, 19850458]

2. How do I wire the programmer and reset correctly?

TX of adapter → 1RX pin; RX → 1TX; GND shared.
Pull CEN low, click “Program”, then release CEN to start bootloader [Elektroda, ExploWare, post #19903108]
Supply 5 V to AMS1117 IN or 3 V3 pin; current ≥ 500 mA [Elektroda, ExploWare, post #19853546]

3. Writer stops at “Erasing 0×11000” – why?

The chip is protected. For BK7231N add --unprotect when using uartprogram, or choose BK7231N mode in BKWriter; baud 921 600 often succeeds after 115 200 fails [Elektroda, boozeman, post #19857804]

4. Relay clicks during flashing – safe fix?

A pull-up on RX1 ties the push-button to 3 V3, driving the relay. Remove jumper R33 on Nedis WIFIPO120FWT, flash, then solder it back [Elektroda, boozeman, post #19882233]

5. How can I back-up the Tuya stock firmware?

Run python bk7231tools.py read_flash -d COMx --no-verify-checksum -s 0 -c 512 dump.bin for T/N chips (2 MB, 512 × 4 KB) [GitHub bk7231tools].

6. My BK7231N loses settings after power-cycle.

Disable FAST_CONNECT (RL_SUPPORT_FAST_CONNECT) or use latest OpenBK build ≥ f6c3c8f6 that stores config outside NET_PARAM table [Elektroda, p.kaczmarek2, post #19893493]

7. Does OTA work and how do I host updates?

Yes. Serve *.rbl over HTTP (http-here --host 0.0.0.0 8000). In WebApp → OTA tab → enter http://<IP>:8000/firmware.rbl; device backs up filesystem, flashes, restores settings [Elektroda, btsimonh, post #19880525]

8. Can I change the MAC address permanently?

MAC can be edited in Config → MAC. It is written to efuse on BK7231T and survives reboot [Elektroda, ExploWare, post #19888851] Corrupted flash prevents saving; run recovery image to re-create tables [Elektroda, p.kaczmarek2, post #19888772]

9. What are the default GPIO roles for common plugs?

• Nedis WIFIPO120FWT – P6 LED, P10 Button, P26 Relay [Elektroda, 19883937] • QiaChip Smart Switch (WB2S,T) – P24 Relay, P26 Button [Elektroda, 19906692]

10. How do I compile on Linux or Windows?

Clone SDK OpenBK7231T, then OpenBK7231T_App into /apps. Build: ./build_app.sh apps/OpenBK7231T_App OpenBK7231T_App git (Linux) or Cygwin on Windows; ensure build-essential and gcc-arm-none-eabi installed [Elektroda, boozeman, post #19885620]

11. Is there a no-solder exploit?

Yes. CloudCutter abuses 2019 Tuya SDK bug to OTA-flash BK7231 lights wirelessly; code published February 2022 [khalednassar/tuya-cloudcutter]. "It works on every test bulb so far" [Tom Clement, #19890768].

12. Edge-case: UART2 log shows boot loop only.

Wrong binary type (UA on BK7231N) causes endless boot; reflash with QIO image at 0×0 then AP appears [Elektroda, p.kaczmarek2, post #19890168]