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

p.kaczmarek2 205626 1308

TL;DR

OpenBK7231T adds a cross-platform C HTTP mini-server, web pin configurator, and MQTT integration for BK7231T-based WB2S/WB3S modules with Home Assistant control.
The design splits Windows-specific networking from reusable HTTP and pin code, so the same configurator and packet parser can run on Windows and on the BK7231T firmware.
The server listens on port 80, uses one int as a channel bitmask, and therefore supports up to 32 channels on a 32-bit platform.
MQTT callbacks propagate relay/button changes to Home Assistant and accept commands back, and a 4-relay setup uses wildcard topics like wb2s/1/get through wb2s/4/set.
The current pin configurator does not save settings to Flash yet, so configuration is still coded and compiled into the firmware.

Generated by the language model.

Treść została przetłumaczona

Zobacz oryginalną wersję tematu

Report a violation of the law

Reply Cool? Ranking DIY | New topic

Notify about new articles

📢 Listen (AI):

#991 20259260 30 Oct 2022 10:42

azavialov azavialov

Level 1

Post #991

20259260 30 Oct 2022 10:42

@p.kaczmarek2 Let me make a small correction to your project.


--- hal_wifi_bk7231.c.orig	2022-10-30 08:24:59.000000000 +0300
+++ hal_wifi_bk7231.c	2022-10-30 12:14:00.186536100 +0300
@@ -308,6 +308,8 @@
 
 	wNetConfig.wifi_mode = SOFT_AP;
 	wNetConfig.dhcp_mode = DHCP_SERVER;
+	os_strncpy((char*)wNetConfig.gateway_ip_addr, (char*)APP_DRONE_DEF_NET_GW, sizeof(wNetConfig.gateway_ip_addr));
+	os_strncpy((char*)wNetConfig.dns_server_ip_addr, (char*)APP_DRONE_DEF_NET_GW, sizeof(wNetConfig.dns_server_ip_addr));
 	wNetConfig.wifi_retry_interval = 100;
 
 	if (1)

This will allow you to get an IP address via DHCP during the initial configuration of the device on more operating systems, including Windows 10.

Otherwise, the DHCP Server issues:
Option (3) default router 255.255.255.255
Option (6) DNS 255.255.255.255
What some OS don't like

Thanks.

ADVERTISEMENT
#992 20259398 30 Oct 2022 12:26

botioni botioni

Level 11

Helpful post? (0)

Post #992
20259398 30 Oct 2022 12:26

@p.kaczmarek2 thx put sensor projact on hold until battery (sleep function add draining battery fast).
new project ldv bulb RGBCW with drv_bp1658cj pinout is gpio8 is data and gpio24 is clock
but not working dosent do anything some driver isu or somthing did maping to 1 0 2 3 4 any help apriciated.
#993 20259431 30 Oct 2022 12:53

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Topic author Helpful post? (0)

Post #993
20259431 30 Oct 2022 12:53

@azavialov I am not at home right now and I can't check your fix, but at least one of your setting seems to be duplicated:

@botioni did you enable "force show rgbcw controller" flag?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#994 20259611 30 Oct 2022 14:29

botioni botioni

Level 11

Helpful post? (0)

Post #994
20259611 30 Oct 2022 14:29

Yes flag 4 and 12 enabled ther is a therdown of a hama gu10 bulb on forum I folowd it but pinuts are not the same I configured it acording what is in the bulb I have one open thet is was broken and 1 thet is flashed with tcc the broken I can see pinout and IC
ADVERTISEMENT
#995 20260185 30 Oct 2022 19:35

ns_ripper ns_ripper

Level 1

Helpful post? (0)

Post #995
20260185 30 Oct 2022 19:35

Hi, I'm running firmware 1.14.93.
This plug is using a BL0937.
It is constantly reporting pulses of 1.2W even when it's in the off state.

Log:
Info:MQTT:Publishing val 0.000000 to Droogkast/power/get retain=0
Info:MQTT:Publishing val 233.526138 to Droogkast/voltage/get retain=0
Info:MQTT:Publishing val 1.294118 to Droogkast/power/get retain=0
Info:MQTT:Publishing val 0.000000 to Droogkast/power/get retain=0
Info:MQTT:Publishing val 1.294118 to Droogkast/power/get retain=0
Info:MQTT:Publishing val 0.000000 to Droogkast/current/get retain=0
Info:MQTT:Publishing val 0.000000 to Droogkast/power/get retain=0
Info:MQTT:Publishing val 1037.111084 to Droogkast/energycounter/get retain=0
Info:MQTT:Publishing val 0.000000 to Droogkast/energycounter_last_hour/get retain=0
Info:MQTT:Publishing val 1.294118 to Droogkast/power/get retain=0
Info:MQTT:Publishing val 0.000000 to Droogkast/power/get retain=0
Info:MQTT:Publishing val 1.294118 to Droogkast/power/get retain=0
Info:MQTT:Publishing val 234.010132 to Droogkast/voltage/get retain=0
Info:MQTT:Publishing val 0.000000 to Droogkast/power/get retain=0
Info:MQTT:Publishing val 1.294118 to Droogkast/power/get retain=0
#996 20261215 31 Oct 2022 14:56

ferbulous ferbulous

Level 18
Helpful post? (0)

Post #996
20261215 31 Oct 2022 14:56

@p.kaczmarek2
Hi, looking at scripting example 3,
Could I do something like this? Select different brightness command for each hold button action?

Code: text Expand Select all Copy to clipboard
addEventHandler OnHold 8 DGR_SendBrightness lamps 90 DGR_SendBrightness lamps 50 DGR_SendBrightness lamps 10

Is it possible to store previous variable then just select the next action?
#997 20261518 31 Oct 2022 18:23

botioni botioni

Level 11

Helpful post? (0)

Post #997
20261518 31 Oct 2022 18:23

is ther any way to flash back original firmware from openBK terminal ?

#998 20262118 31 Oct 2022 23:54

ferbulous ferbulous

Level 18

Post #998

20262118 31 Oct 2022 23:54

botioni wrote:
is ther any way to flash back original firmware from openBK terminal ?

No, you’ll need to use serial method to perform that.
This instruction is taken from libretuya’s developer. I haven’t try this yet though


Do this:
- take the full dump (2 MiB / 2,097,152 bytes)
- cut the middle of it - starting at 0x11000, all the way to i.e. 0x132000 (so it results in a bit more than 1 MiB)
- flash it to offset 0x11000

^ this method will work for both T and N. 
Flashing to 0x0 on T is impossible. On N it's unnecessary and causes flash wear-out. So don't ever flash to 0x0 at all.

#999 20262121 31 Oct 2022 23:57

MotoSpeed MotoSpeed

Level 4

Helpful post? (0)

Post #999
20262121 31 Oct 2022 23:57

Can I request an additional channel type? I would like to see an OffLowHigh channel type with the heading "Power indicator LED:." I've been testing with a dimmer switch that has a power indicator LED that is controlled by the TuyaMCU. The three functions are Off (0), Low (1), High (2). Currently, I have been using channel type LowMidHigh, which works, but the heading reads "Select speed:," and the three options are Low, Mid, High. I edited the webpage HTML to give an example:
#1000 20262145 01 Nov 2022 00:25

_leming_ _leming_

Level 11

» | Helpful post? (0)

Post #1000
20262145 01 Nov 2022 00:25

Hello dear,

I have two smart bays for which I cannot install the software for using them outside the cloud,
one GOSUND SP1-C, the other AWP08L,
After disassembling them in AWP08L, I found the BK7231T chip and this seems to be supported by software prepared by @ p.kaczmarek2,
in the second there is a module that I cannot identify
I am asking for information and help,
Is it possible to reprogram AWP08L without connecting via RSp-TTL, and whether the second socket also gives a similar possibility
Below are photos of these devices, if there is a need to do a flash dump, I will be able to do it with a little help
Thank you in advance for any help

greetings
#1001 20262156 01 Nov 2022 00:57

ExploWare ExploWare

Level 10

Helpful post? (0)

Post #1001
20262156 01 Nov 2022 00:57

p.kaczmarek2 wrote:
@exploware all of that shall work.
Option to remember LED state:

pins config CW:

gui for CW:

I will update comment on the Relay saving page.

Indeed, this works, I just confirmed it in my setup. Thanks!
#1002 20262223 01 Nov 2022 07:19

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home
Topic author Helpful post? (0)

Post #1002
20262223 01 Nov 2022 07:19

MQTT stability will improve today. LWIP updated to latest version. Now even 20 publishes per seconds will be possible.

MotoSpeed wrote:
Can I request an additional channel type? I would like to see an OffLowHigh channel type with the heading "Power indicator LED:." I've been testing with a dimmer switch that has a power indicator LED that is controlled by the TuyaMCU. The three functions are Off (0), Low (1), High (2). Currently, I have been using channel type LowMidHigh, which works, but the heading reads "Select speed:," and the three options are Low, Mid, High. I edited the webpage HTML to give an example:

I can add it for you, but what about simply adding an option to set any user-defined heading for a given channel? Would that work good for you?

ns_ripper wrote:
Hi, I'm running firmware 1.14.93.
This plug is using a BL0937.
It is constantly reporting pulses of 1.2W even when it's in the off state.

Was the plug calibrated?

I can add an options to always report 0 power consumption if relay is in off state, if that's needed.

ferbulous wrote:
@p.kaczmarek2
Hi, looking at scripting example 3,
Could I do something like this? Select different brightness command for each hold button action?

Code: text Expand Select all Copy to clipboard
addEventHandler OnHold 8 DGR_SendBrightness lamps 90 DGR_SendBrightness lamps 50 DGR_SendBrightness lamps 10

Maybe we could try catching both first press of button and setting a variable to 0 there, then catch each hold and increase variable on each hold. But that would send a lot of packets. I will try it for you, wait...
but what are you trying to achieve? Why not simply two buttons, one for brightness up and second for down?

ExploWare wrote:

Indeed, this works, I just confirmed it in my setup. Thanks!

Thank you, that comment saying "LED saving state not supported yet" was a left over on our part, we have also updated this comment.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
ADVERTISEMENT
#1003 20262414 01 Nov 2022 10:47

ferbulous ferbulous

Level 18

Helpful post? (0)

Post #1003
20262414 01 Nov 2022 10:47

p.kaczmarek2 wrote:
Maybe we could try catching both first press of button and setting a variable to 0 there, then catch each hold and increase variable on each hold. But that would send a lot of packets. I will try it for you, wait...
but what are you trying to achieve? Why not simply two buttons, one for brightness up and second for down?

Indeed, that's a better solution for wall switch with more than 2 buttons.
How does that work? Does it mean the longer I hold, the higher the variable increases,
i) It sends brightness variable after I release button or
ii) It keeps sending the brightness variable as I keep holding the button

What I was trying to achieve was for 1 button wall switch.
My nodered flows is this:
Click - toggle lights on/off
Double Click - toggle between cold & warm light
Hold - Cycle between 20%, 50%, 90% brightness <-- using hold action to just cycle different brightness. using input helper,the flow retains the last brightness toggled, so if it was 90%, another hold action cycles/reset back to 20%. Next hold is 50% and so forth.

https://pastebin.com/nmfPHqcB

Added after 23 [minutes]:

@_leming_

For the one with bk7231t, you could try tuyacloudcutter to flash via ota

As for the other unidentified module, it could be CB2L (bk7231n). Could you try opening the metal case to be sure?
#1004 20262726 01 Nov 2022 13:18

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home
Topic author Helpful post? (+1)

Post #1004
20262726 01 Nov 2022 13:18

ferbulous wrote:

How does that work? Does it mean the longer I hold, the higher the variable increases,
i) It sends brightness variable after I release button or
ii) It keeps sending the brightness variable as I keep holding the button

It will require again firmware update (but maybe wait one day, because @btsimonh is investigating something in LFS update), but it works for me, tested right now, although you might change the added value from 2 to larger because its slow:

Code: text Expand Select all Copy to clipboard
// Button OnHoldStart and OnHold demo // Requires a button on pin 20 // Channel 10 is used as variable // When button hold start happens, channel 10 is set 0 // When a button is held, the value is added to channel 10 repeatedly. // Also, when adding, the channel 10 is used as a brightness for Tasmota Devices Group startDriver DGR // generate repeat after 100 ms - yes, unit here is times 100ms // so 1 means every 100ms // 2 means every 200ms setButtonHoldRepeat 1 // when Hold starts, zero the variable addEventHandler OnHoldStart 20 SetChannel 10 0 // when Hold repeats, add a 10 value as a step // AddChannelSyntax: channelindex delta minValue maxValue // the 0 255 is needed so we clamp the value to 255 addEventHandler OnHold 20 backlog AddChannel 10 2 0 255; DGR_SendBrightness roomLEDstrips $CH10

also it's possible that doing startDriver DGR in autoexec.bat might be too quick, if so, we will add a delay...

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#1005 20262965 01 Nov 2022 15:49

ferbulous ferbulous

Level 18

Helpful post? (0)

Post #1005
20262965 01 Nov 2022 15:49

@p.kaczmarek2 Thanks! it's quite amazing that you can use hold action to mimic dimming, I will try it for next update
How would I configure it to reduce brightness? Do i just replace with negative value
#1006 20263585 01 Nov 2022 21:50

MotoSpeed MotoSpeed

Level 4

Helpful post? (0)

Post #1006
20263585 01 Nov 2022 21:50

p.kaczmarek2 wrote:

MotoSpeed wrote:
Can I request an additional channel type? I would like to see an OffLowHigh channel type with the heading "Power indicator LED:." I've been testing with a dimmer switch that has a power indicator LED that is controlled by the TuyaMCU. The three functions are Off (0), Low (1), High (2). Currently, I have been using channel type LowMidHigh, which works, but the heading reads "Select speed:," and the three options are Low, Mid, High. I edited the webpage HTML to give an example:

I can add it for you, but what about simply adding an option to set any user-defined heading for a given channel? Would that work good for you?

@p.kaczmarek2 Yes, that should work. Thank you.
#1007 20263788 02 Nov 2022 06:12

botioni botioni

Level 11

Helpful post? (0)

Post #1007
20263788 02 Nov 2022 06:12

Is ther any compiling tutorial for openbk?
I will end up writing code for it I think to recover mine bulb with the bp1658cj driver i think .
ADVERTISEMENT
#1008 20264101 02 Nov 2022 11:27

Sergio127 Sergio127

Level 4

Helpful post? (0)

Post #1008
20264101 02 Nov 2022 11:27

Hi, can you help me with the new device?
I have a lamp - https://www.aliexpress.com/item/1005004319893210.html
BL602c20 has inside, I flashed OpenBL602_1.14.90, the controller started, but the control of the lamps turned out to be through UCS1912S led driver chip. And I don't know what to do next.
I have already identified all GPIOs.
#1009 20264338 02 Nov 2022 13:54

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home
Topic author Helpful post? (0)

Post #1009
20264338 02 Nov 2022 13:54

@ferbulous it is possible to use both positive and negative values for arguments.
For the floating point or integer arguments, the math expression syntax also is supported (but don't update yet, it's early stage).
So the following will work:
Code: text Expand Select all Copy to clipboard
// sets channel 1 to channel 2 value + 2 setChannel 1 2+$CH2

Code: text Expand Select all Copy to clipboard
// sets channel 1 to channel 2 value * 2 setChannel 1 2*$CH2

Code: text Expand Select all Copy to clipboard
// sets channel 1 to the logical value of MQTTOn setChannel 1 MQTTOn

@botioni the tutorial for compiling is here:
https://www.elektroda.com/rtvforum/topic3850712.html
but for OBK there is one step more - read our readme - just checkout APP repository into the SDK repository for chosen platform

@Sergio127 wow, that's a good job, you even drawn a schematic! This deserves a separate topic. Can you please post it here:
https://www.elektroda.com/rtvforum/topic3912748.html#google_vignette but also include screenshots from the seller link (because links tends to expire) so we can add it to our online devices database?
https://openbekeniot.github.io/webapp/devicesList.html
Regarding your question: here is a datasheet of UCS1912S :
UCS1912...pdf (187.72 kB)You must be logged in to download this attachment.
As you may see, it will require a simple driver written in C code. I can write one for you, but would you be able to test it somehow? Do you have C knowledge to help?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#1010 20264441 02 Nov 2022 14:51

Sergio127 Sergio127

Level 4

Helpful post? (0)

Post #1010
20264441 02 Nov 2022 14:51

@p.kaczmarek2
Quote:
wow, that's a good job, you even drawn a schematic! This deserves a separate topic. Can you please post it here:
https://www.elektroda.com/rtvforum/topic3912748.html#google_vignette but also include screenshots from the seller link (because links tends to expire) so we can add it to our online devices database?
https://openbekeniot.github.io/webapp/devicesList.html
Regarding your question: here is a datasheet of UCS1912S :

As you may see, it will require a simple driver written in C code. I can write one for you, but would you be able to test it somehow? Do you have C knowledge to help?

I have published a post - https://www.elektroda.com/rtvforum/topic3930834.html#20264437.
I hope for your help in writing the driver, I am not a programmer myself, but I am ready to test it.
#1011 20266736 03 Nov 2022 20:53

botioni botioni

Level 11

Helpful post? (0)

Post #1011
20266736 03 Nov 2022 20:53

Ledvance bulb done
Startup command
BP1658CJ_Map 2 1 0 3 4
#1012 20267690 04 Nov 2022 15:40

yonnit yonnit

Level 2

Helpful post? (0)

Post #1012
20267690 04 Nov 2022 15:40

Hi,

a while ago, I purchased these fairy lights:

I successfully flashed them with OpenBeken, but I had no luck configuring them so far and was hoping I could get some help here

My device looks pretty similar to that one here: https://www.elektroda.com/rtvforum/topic3866123-330.html#19932845
But instead of having 3 outputs for R G B mine only has one labeled LED. I think because they are individually addressable LEDs.

I tried tracing the connection labeled LED with a multimeter and marked the pin on the WB8 chip on the attached picture.

Here are some pictures:

Please let me know if I can provide any additional information or pictures that could help!
#1013 20267694 04 Nov 2022 15:43

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Topic author Helpful post? (0)

Post #1013
20267694 04 Nov 2022 15:43

@yonnit I can get a driver for you for that device, but are you able to determine what kind of LEDs are used there, or at least tell us if they were able to have different colors (each LED different color) with Tuya firmware?
I'd suspect they are ws2812b.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#1014 20267841 04 Nov 2022 17:13

ferbulous ferbulous

Level 18

Helpful post? (0)

Post #1014
20267841 04 Nov 2022 17:13

@p.kaczmarek2 hi, there's this odd thing happening when I'm choosing colors, the brightness keep changing.
As for the warm & cold lights, changing the brightness also changes the rgb bulb color icon (not actual warm & cold lights) for some reason.
Anything else I need to enable in the general settings to fix this?

Btw, I just reset one of my switch and 1 bulb and both are getting the same mac id:
Device MAC: C8:47:8C:00:00:00
I tried changing the switch mac id by grabbing random mac address from mac generator but now it's no longer connecting to wifi.
#1015 20267879 04 Nov 2022 17:35

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Topic author Helpful post? (0)

Post #1015
20267879 04 Nov 2022 17:35

As for colors, you can open a new issue on git. Was it always like it?

As per MAC, there is already a tool for that. Go to Web App, go to Flash tab, and press "Restore RF Config". It will create a correct RF partition if you have lost your one. It should work on both T and N.

That option will restore MAC partition and also add a random mac to it.

Warning: if you don't have access to easy way of emergence flashing your device, you might want to wait a day or two before doing that That option was added yesterday and is in testing phase. Still, I tested that and it worked for me well.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#1016 20267909 04 Nov 2022 17:52

botioni botioni

Level 11

Helpful post? (0)

Post #1016
20267909 04 Nov 2022 17:52

Can sombady share an homeassitant yaml config for rgbwc bulb with driver configured
i cant find anyware documantion?
#1017 20267948 04 Nov 2022 18:12

ferbulous ferbulous

Level 18

Helpful post? (0)

Post #1017
20267948 04 Nov 2022 18:12

p.kaczmarek2 wrote:
As for colors, you can open a new issue on git. Was it always like it?

It's been like that for quite some time, i'll open a new issue there

p.kaczmarek2 wrote:
As per MAC, there is already a tool for that. Go to Web App, go to Flash tab, and press "Restore RF Config". It will create a correct RF partition if you have lost your one. It should work on both T and N.

So this will be next step after doing a factory reset (7x power cycle)?
For my switch, I've tried flashing openbk again using serial method and did 7x power cycle. I can see the AP, but I just can't connect to it
Any other way to restore the mac somehow with serial method?
#1018 20267950 04 Nov 2022 18:13

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Topic author Helpful post? (0)

Post #1018
20267950 04 Nov 2022 18:13

It doesn't matter if RGBCW has a driver chip or direct PWMs. It works the same way every time.

Here's my old, reliable config for RGBCW bulb (WARNING: may contain old HA syntax):
Code: YAML
Log in, to see the code

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#1019 20267954 04 Nov 2022 18:15

ferbulous ferbulous

Level 18

Helpful post? (0)

Post #1019
20267954 04 Nov 2022 18:15

botioni wrote:
Can sombady share an homeassitant yaml config for rgbwc bulb with driver configured
i cant find anyware documantion?

You can refer to the config here

https://www.elektroda.com/rtvforum/topic3925796.html
#1020 20267958 04 Nov 2022 18:16

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Topic author Helpful post? (0)

Post #1020
20267958 04 Nov 2022 18:16

ferbulous wrote:

p.kaczmarek2 wrote:
As per MAC, there is already a tool for that. Go to Web App, go to Flash tab, and press "Restore RF Config". It will create a correct RF partition if you have lost your one. It should work on both T and N.

So this will be next step after doing a factory reset (7x power cycle)?

You can do this anytime you want. No need to do resets. Just remember it will change your MAC address to something random.

Regarding AP issue - you might have gotten unlucky and gotten the build with a temporary issue which is resolved. Try latest build.

BTW: We are migrating from daily Releases to doing Release every week or two with a stable tested features. There will be also a daily alpha builds, but they might be unstable. More details coming soon.

Second news: I wrote a simple SPI flasher for BK, right now just with hardcoded parms, more coming soon...
https://github.com/openshwprojects/BK7231_SPI_Flasher
This tool is able to bring back the bricked BK chips back to live.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
Create an account, log in here. You will receive points by participating in discussions.
Join this discussion.

Install Elektroda application

Reply Cool? Ranking DIY | New topic

Notify about new articles

📢 Listen (AI):

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.
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, post #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]

Generated by the language model.