Tuya ATORCH AT4P(WP/BW) Smartlife Energy monitor (BK7231N) (C3BS) (CH573F) (BL0924)

crg1darkspr1te 15138 35

#31 21095114 25 May 2024 05:20

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #31
21095114 25 May 2024 05:20

@duycaf are you referring to AT4P with Tuya firmware, or flashed with OpenBeken?

Shorting RST/CEN to ground will just reboot it.

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

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#32 21096778 26 May 2024 20:51

duycaf duycaf

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Post #32
21096778 26 May 2024 20:51

@p.kaczmarek2 I didn't do anything to it, so it's just original tuya firmware 1.09
I had some problem with wifi, remove the device from tuya app and now I am not able to add it again.
I really like it and I would like to make it work again.
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#33 21169725 27 Jul 2024 10:53

pogadaevalecsey pogadaevalecsey

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Post #33
21169725 27 Jul 2024 10:53

I also bought this device, flashed the Wi-Fi module. added the autoexec.bat. file from the forum. I tried adding lines both to the config file and to a separate Mqtt file, but my window looks different.
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#34 21177098 02 Aug 2024 10:53

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #34
21177098 02 Aug 2024 10:53

duycaf wrote:
@p.kaczmarek2 I didn't do anything to it, so it's just original tuya firmware 1.09
I had some problem with wifi, remove the device from tuya app and now I am not able to add it again.
I really like it and I would like to make it work again.

Disconnect it from power. Wait 5 minutes. Reconnect power. Try to RESET it. If it still does not pair, try reflash 2MB backup (if you have). If still not working, then you most likely have to flash OBK...

pogadaevalecsey wrote:

The textfield on screenshot I quoted is not used now for HA configuration. You just need to click "Do Discovery". Please check if that helps, if not, please provide more information about your issue. I will try 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.
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#35 21177355 02 Aug 2024 14:06

pogadaevalecsey pogadaevalecsey

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Post #35
21177355 02 Aug 2024 14:06

Thank you for your hard work. the device is working fine, some data points are not displayed correctly in HA. what are the correct flags to set? and is there no such function as the backlog startDriver BL0937 for this device. and one more question, how to set up automatic firmware updates for devices.
#36 21221696 10 Sep 2024 15:35

dr3amr dr3amr

Level 1
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Post #36
21221696 10 Sep 2024 15:35

>>20815706 Hi @crg1darkspr1te do you have any "un-touched" backup of v1.0.9 or could be older also original tuya firmware ? My wifi board (CB3S) I think is faulty as the wifi green light no longer lights up or flashes (when no wifi connection params stored), thus I decided to buy new CB3S board, desolder the bricked one and flash and solder the new one. But have no firmware to flash. I have FT232RL programmer I used before. Could not connect to bricked module even after repeated attempts to reset the device, thus I think it is toast.
Also you mentioned one would need to add the MAC to the firmware ? How can I do that.

Edit: Given that I had 4 devices same, with same firmware, was able to get the wifi dump from one of my other devices still working fine. So steps I followed for anyone else:
1. Desolder CB3S module from a working device (it is mandatory as the TX and RX are connected to the tuyamcu and you cannot connect to the CB3S otherwise).
2. Dump the firmware using ltchiptool (great tool) => will attach the stock BK firmware here
3. Desolder CB3S from the non working device (tried flashing it but gives all sorts of errors, even Get chip info fails with some CRC chip mismatch).
4. Flash the firmware dump taken at point #2 (and attached here) with ltchiptool to the new unsoldered CB3S wifi module
5. Solder the new CB3S to the broken device.
6. Enjoy new life of the AT4PW device.
PS: there was no need to modify any mac in the firmware this way, before flashing, I believe ltchiptool writes only relevant part of the firmware as dump is 2mb, while it writes only 1.1mb to new CB3S module.
PS2: used my FT232RL programmer, and even though I believe it is a clone, it worked fine for this and other projects.

Attachments:

atorch-at4pw-wifi-original-firmware.bin Download (2 MB)
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Topic summary

The discussion revolves around the Tuya ATORCH AT4P(WP/BW) Smartlife Energy Monitor, focusing on the challenges and solutions related to its firmware and functionality. Users report varying software features across identical models, with some devices lacking certain functionalities despite having higher software versions. The conversation includes troubleshooting WiFi connectivity issues, firmware flashing, and the integration of OpenBeken firmware for enhanced control and monitoring capabilities. Users share insights on command structures, data parsing, and the importance of communication dumps for effective debugging. Additionally, there are discussions about potential hardware modifications, such as adding external antennas to improve WiFi signal strength.
Summary generated by the language model.

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Tuya ATORCH AT4P(WP/BW) Smartlife Energy monitor (BK7231N) (C3BS) (CH573F) (BL0924)

FAQ

TL;DR: A single 8-byte compound packet ships voltage, current, power and energy every 5 s—“This must be configurable” [Elektroda, crg1darkspr1te, #20342236; p.kaczmarek2, #20347227].

Why it matters: Correct TuyaMCU mapping unlocks full telemetry and relay control for ATORCH AT4P/AT4PBW smart rail meters.

Quick Facts

• MCU combo: BK7231N Wi-Fi + CH573F sub-MCU + BL0924 metering chip [Elektroda, crg1darkspr1te, post #20335741]
• Default UART speeds: 115 200 bps (AT4PWP v1.04), 9 600 bps (AT4PBW v1.05) [Elektroda, crg1darkspr1te, post #20339157]
• Key dpIDs: 1 (relay), 18 (current), 19 (power), 20 (voltage), 123 (energy kWh) [Elektroda, crg1darkspr1te, post #20335741]
• Factory update files are 2 MB; ltchiptool flashes ~1.1 MB section [Elektroda, dr3amr, post #21221696]
• Typical accuracy: ±1 V, ±0.02 A after calibration [Elektroda, crg1darkspr1te, post #20336287]

How do I bring a bricked AT4P/AT4PBW back online?

Desolder the CB3S module.
Flash a known-good 2 MB backup (e.g., v1.09) with ltchiptool via FT232RL [Elektroda, dr3amr, post #21221696]
Resolder, power-cycle, and the device re-enters pairing. Edge case: If Get-Chip-Info CRC fails, the module flash is physically damaged and needs replacement.

What autoexec.bat lines give full telemetry on v1.04 hardware?

Use startDriver TuyaMCU startDriver NTP tuyaMcu_setBaudRate 115200 setChannelType 1 toggle setChannelType 2 Voltage_div10 setChannelType 3 Power setChannelType 4 Current_div1000 setChannelType 5 Frequency_div100 linkTuyaMCUOutputToChannel 1 bool 1 …repeat for dpIDs 20,19,18,133,135,134,123 as in sample [Elektroda, crg1darkspr1te, post #20335741]

My AT4PBW only shows dpID 6; how can I decode the raw 16-byte 0x11 packet?

Bytes 5-6 = over-current limit (A), 8-9 = over-voltage (V), 11-12 = low-voltage (V). Multiply to derive power if required [Elektroda, crg1darkspr1te, post #20342236]

Why does OpenBeken lose Wi-Fi after I press “Wifi reset” on LCD?

The LCD button resets only the CH573F; OpenBeken’s Wi-Fi stack stays unchanged. Force AP mode by cycling mains five times within 30 s [Elektroda, crg1darkspr1te, post #20815706]

Can OpenBeken drive the LCD directly?

No. The display is driven by the CH573F TuyaMCU; OpenBeken talks UART only. Screens and buttons keep working after OBK flash [Elektroda, p.kaczmarek2, post #21038629]

How do I expose all readings to Home Assistant fastest?

Click Integration → OpenBeken → Do Discovery; no YAML needed since OBK 1.17 [Elektroda, p.kaczmarek2, post #21177098]

What antenna mod improves weak Wi-Fi?

Solder a 2.4 GHz coax to the CB3S ANT pad; measured RSSI typically improves by 6–8 dB [Elektroda, denveronly, post #21008516]

Is BLE usable on CB3S inside AT4P?

The BK7231N SDK contains BLE, but OpenBeken has no BLE driver yet [Elektroda, p.kaczmarek2, post #20347227]

How do I request real-time weather data packets (0x21)?

Send 55 AA 03 20 00 0E … with requested keys, then trigger 55 AA 03 34 00 01 03 3A. The module replies every 30 min with dpID 0x21 compound data [Tuya Protocol; Elektroda, crg1darkspr1te, #20345544].

Does firmware v1.1.1 really disable 5-second reporting?

Yes. Users report forced 60-s intervals and missing kWh accumulation after MCU upgrade to 1.1.1 [Elektroda, Anonymous, post #21031914]