Smart home ecosystems often face the challenge of identifying a particular device on a network or app, a particularly relevant issue when trying to link a temperature and humidity sensor to third-party smart automation systems such as Home Assistant. MAC-address is a unique identifier of the network interface, without which it is impossible to configure a stable interaction between the gadget and the control hub.
The problem is that manufacturers often hide this information in the depth of menus or use shortened display formats. For Xiaomi Mijia devices, finding this code can turn into a quest if you do not know the exact paths of navigation. In this article, we will discuss all the available methods for obtaining a unique identifier for your thermometer.
We'll look at both the software and physical methods of inspecting the case, and we'll also talk about the differences between Bluetooth and Wi-Fi versions of devices, because the algorithms for the two are very different, and understanding these nuances will save you time and nerves when you first set up the hardware.
Physical inspection of the device and factory marking
The fastest and most reliable way to find an ID is to inspect the gadget itself. On the back of almost all of the Xiaomi and Qingping sensors, there's a factory sticker. MAC-You don't have to turn on the device or look for the smartphone at hand.
The information is usually located next to the barcode or QR-Look for a line marked as "MAC" Or just a sequence of 12 hexadecimal characters separated by a colon, for example, a format might look like AA:BB:CC:11:22:33. Occasionally, manufacturers apply this code in microscopic font, so it is recommended to use a magnifier or camera phone with zoom.
⚠️ Warning: Don't try to unstick the factory label to look at the code underneath.The adhesive base may get damaged and the sticker will stop holding, resulting in loss of warranty and the possibility of sticking the reset button.
It is worth considering that some sensor revisions, especially those for the domestic Chinese market, may not have a full address, in which case the sticker only has a shortened version or model code, and then you have to use software methods to verify through the Mi Home app.
Finding an address through the Mi Home app
The official Mi Home app is the main eco-system control tool, but the interface changes frequently, making it harder to find the information you need, and first, make sure your sensor is already added to the list of devices and displayed on the home screen.
Go to the device card by clicking on the thermometer icon. In the upper right corner of the screen, find the three-dot button or the gear icon for the settings menu. This is where the technical connection information is hidden. You'll need to scroll down to the "About Device" or "Information" section.
Why can't the address be displayed?
In the menu that opens, look for the Bluetooth MAC or Device ID field. Often the system displays the identifier in a format other than the classic network address. In this case, you may need to convert or use special plugins that can read this ID. For ordinary users, it is enough to copy the displayed code.
- 📱 Open the Mi Home app and log in.
- 🏠 Go to the Devices tab and select your thermometer.
- ⚙️ Click on the settings menu (three dots) in the corner of the screen.
- ℹ️ Find the "About the device" section to view technical data.
Use of third-party Bluetooth scanners
If standard methods fail, specialized tools for scanning the Bluetooth environment come to the rescue, applications like nRF Connect or LightBlue that allow you to see the raw data that the sensor broadcasts to the air, which is the most professional approach to solving the problem.
Once you install the app, run the scan. You'll see a lot of names in the list of devices you find. Xiaomi sensors are often displayed as Mijia_XXXX or MAC-When you connect to the device, you can see service specifications in the logs, where you often have a unique identifier.
It's important to understand that some sensors in standby mode may not be broadcasting the full data packet to save power, in which case you need to press a button on the thermometer body to activate the pairing mode, only then the scanner can read the full information about the Bluetooth address.
Differences between Bluetooth and Wi-Fi versions
It is critical to distinguish between the type of connection your device has, as the structure of the address depends on it. - Bluetooth Low Energy (BLE) Devices use a single addressing format, while Wi-Fi gadgets have a classic networking format. MAC-address associated with the network module.
Wi-Fi-enabled devices, such as some screen thermometer models, connect directly to the router, and can be found in the router's admin panel on the client list, where it will be displayed as standard XX:XX:XX:XX:XX:XX:XX:XX. This makes it easier to set up static IP and filtering rules.
| Characteristics | Bluetooth version | Wi-Fi version |
|---|---|---|
| Type of connection | Through the airlock or the phone. | Direct to the router |
| Range of action | Up to 10 meters. | Wi-Fi network coverage |
| Energy consumption | Minimum (battery 1-2 years) | High (requires frequent replacement) |
| Address format | Often hidden or reduced | Full network MAC |
If you're trying to connect a Bluetooth sensor to a system that requires a Wi-Fi address, it won't work. Make sure your target platform supports BLE. Such sensors often require a permanent gateway to run the data on the Internet.
Definition problems and their solution
A common problem is when the app sees the device but does not give access to its full address.This can be due to the limitations of the smartphone operating system, especially in Android versions of the newer version 10.
Check the permissions of the Mi Home app. It should be allowed location access (GPS), because in Android, scanning Bluetooth devices is equivalent to determining the user's geolocation. Without this permission, the list of devices will be empty or cropped.
☑️ Access rights verification
Also, you should pay attention to the region selected in the application. If the sensor is for the Chinese market and the application is set to "Europe", some fields may not fill in correctly. Try temporarily changing the region in the profile settings, adding the device, copying the data and returning the region back.
Data security and privacy
The unique device identifier is not secret information in the same sense as a Wi-Fi password, but knowing it allows you to track the presence of the device within range. MAC-address, can theoretically clone the device or cause interference.
In modern versions of Xiaomi firmware introduced the function of randomization MAC-This means that for an outsider scanner, the address will change every few minutes, but for a smart home system, a permanent internal identifier is used.
⚠️ Note: Never post the full article MAC-address ID Open source devices or forums, along with your account, can make it easier for attackers to try to link your device to their account.
Recommended to update sensor firmware regularly through the app.Manufacturers close vulnerabilities