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To command an EAWCBT-Tuya device using OpenBK (OpenBeken), you must first flash the device with the appropriate OpenBK firmware (BK7231T or BK7231N variant), configure the device’s GPIOs and communication settings (e.g., MQTT), and then issue commands either through the OpenBK web console, MQTT topics, or the OpenBK HTTP interface. The key steps include obtaining the correct firmware, flashing the device, mapping its pins, and using recognized commands (e.g., “Power1 ON”, MQTT “cmnd/
• Flash the correct OpenBeken firmware for your EAWCBT-Tuya hardware (BK7231T or BK7231N).
• Configure the module (Wi-Fi, MQTT, GPIO mapping) via the OpenBK web interface.
• Use commands from the OpenBK console, MQTT, or HTTP REST API to control relays, LEDs, or other features.
• Use existing documentation (e.g., OpenBK7231T_App GitHub repository) for command syntax and advanced configurations.
The EAWCBT-Tuya module is often a Wi-Fi-enabled breaker or relay module based on a BK7231-series chip. By flashing OpenBeken (referred to as OpenBK), you remove the original Tuya firmware and replace it with open-source software, enabling local device control via MQTT, HTTP, or a console interface—without relying on Tuya’s cloud services. Below is a detailed breakdown:
Identifying and preparing the module
• EAWCBT-Tuya devices typically contain a BK7231T or BK7231N microcontroller. Confirm the exact chip type to select the correct firmware binary.
• Prior to flashing, locate UART pins (TX, RX, GND, 3.3 V) on the PCB and verify hardware connections.
Flashing the OpenBK firmware
• Use a USB TTL (3.3 V) adapter and one of the flashing tools (bk_writer, hid_download_py, or cloudcutter) to upload OpenBK.
• Carefully connect TX ↔ RX and RX ↔ TX, ensuring GND and 3.3 V lines are properly connected.
• Obtain the latest firmware binary specific to your chip (T vs N) from the official GitHub (github.com/openshwprojects/OpenBK7231T_App).
• Follow the recommended flashing procedure, which often involves powering up the device in bootloader mode (tying certain pins low or bridging test pads).
Configuring OpenBK after flashing
• Upon first boot, the device will broadcast a Wi-Fi access point, usually named “OpenBK…” or similar. Connect and navigate to http://192.168.4.1 in a browser.
• Enter your home Wi-Fi credentials. After reboot, find the device on your network (via DHCP) and access the web interface (use your router’s DHCP client list or a network scanner to locate the IP).
• Configure relevant GPIO pins in the “Configure Module” or “Configure Pins” menu. For an EAWCBT-Tuya breaker or relay module, you must map the relay pin(s), any LED or button pins, and if it uses a secondary TuyaMCU subprocessor, configure the “TuyaMCU” driver.
Commanding the device
There are several methods to issue commands:
a) Web Console in OpenBK
• Access the device’s IP address in a browser, open the “Console” tab, and type commands like:
Power1 ON
Power1 OFF
• For TuyaMCU-driven channels, you might use:
tuyaMcu_sendCmd
• Consult the OpenBK documentation (docs/commands.md) for advanced commands and scripting examples.
b) MQTT
• In the “Configure MQTT” section, enter your broker address, port, and credentials.
• Once connected, you can publish MQTT messages to control the relay. For instance:
Topic: cmnd/
Payload: ON or OFF
• The device will publish state updates to stat/
c) HTTP REST Calls
• You can send commands via simple HTTP GET requests:
http://
http://
d) Home Assistant Integration
• OpenBK can generate Home Assistant YAML automatically in the web interface.
• Add the generated YAML to your Home Assistant configuration for seamless discovery and control.
Scripting and rules (advanced)
• OpenBK supports basic scripting to automate behaviors, handle timers, or respond to sensors.
• You can create rules to toggle relays based on a button press, sensor reading, or schedule.
• The BK7231-series chips have gained popularity in Tuya ecosystem devices as replacements for older ESP8266-based modules. Because of their closed-source nature, projects like OpenBeken were developed to offer local control.
• Cloud-free solutions are now favored by users seeking security, privacy, and reliability, driving increased community effort in reverse-engineering BK7231 modules and contributing to projects such as Tasmota or ESPHome forks.
• Future firmware releases are focusing on improved user-friendly interfaces, support for additional modules, and advanced integration with IoT platforms like Home Assistant, Node-RED, or other custom setups.
• GPIO mapping is often the most challenging part: discovering which pins on the EAWCBT board drive relays or LEDs may require trial-and-error or referencing community-shared pinouts.
• When the device uses a TuyaMCU subprocessor, the main BK7231 chip communicates to that subprocessor using serial commands. OpenBK’s “TuyaMCU” driver automatically manages the protocol if configured properly, letting you control relays or read sensor data via well-defined commands.
• Tools like MQTT Explorer can help debug communication between the device and your MQTT broker.
• Modifying firmware on consumer devices can void warranties and may not comply with the device manufacturer’s original terms of use.
• If the EAWCBT is a circuit breaker or high-voltage switching device, ensure compliance with local electrical regulations and consider safety aspects.
• For commercial or large-scale deployments, be mindful of liability, testing, and certification requirements.
• Always isolate the module from mains power before opening the enclosure or making hardware modifications.
• Double-check the pin voltages and polarity when wiring the UART adapter. A mismatch can permanently damage the module.
• If using MQTT or HTTP for control, secure your network to prevent unauthorized access to the device.
• For advanced or mission-critical applications, thoroughly test the reliability of local commands and fail-safe mechanisms.
• The BK7231 firmware ecosystem is rapidly evolving. Double-check you have the latest stable or recommended build from the official GitHub.
• Document any hardware modifications you make, especially if you plan to revert to stock Tuya firmware or share with the community.
• If your device includes additional sensors or features not yet supported by OpenBK, consult the community forums for experimental drivers or workarounds.
• Explore the OpenBeken GitHub issues and wiki pages:
https://github.com/openshwprojects/OpenBK7231T_App
• Look into advanced scripting documentation within OpenBK for automation tasks.
• Investigate additional open-source IoT firmware platforms (e.g., Tasmota, ESPHome forks for BK7231) and compare feature sets.
• Monitor community forums (e.g., elektroda, Home Assistant, or the OpenBeken Discord) for new device support, trouble-shooting tips, and advanced GPIO mappings.
Commanding an EAWCBT-Tuya device with OpenBK involves (1) flashing the correct firmware, (2) configuring Wi-Fi, MQTT, and GPIO pins, and (3) issuing control commands via console, MQTT, or HTTP. This process enables local, cloud-free control of your EAWCBT device, aligning with current IoT trends for security, flexibility, and reliability. Always handle high-voltage devices with caution, verify hardware compatibility, and consult the latest OpenBK documentation for evolving features and best practices.
