I will need the BLE advertisements to be able to add this device. Please follow the instructions in the documentation to get this.

Hi, @Xuantam91 @Ernst79,

Something may have been able to move forward?

I'll add that the problem is that BLE communication is encrypted, and from the projects I know of, the data only manages to be acquired through Xiaomi gateway:
RobertWojtowicz/export2garmin#54

BR,
Robert

Yes there is some development. We are (actually, @zry98 is) currently adding it to the official BLE integration.

Related PRs
Xiaomi-ble: Bluetooth-Devices/xiaomi-ble#163
Home assistant: home-assistant/core#142705 (comment)

We can copy that to BLE monitor

@Ernst79

Thanks for such good news, I understand you mean this solution?: https://github.com/Bluetooth-Devices/xiaomi-ble

How to use (outside of HA) I would like to attach to my integration (sending downloaded and calculated data to Garmin)

BR,
Robert

Yes, that is the parser that is used by HA. I don’t know what you mean with “attach it to my integration”. Which integration?

Hi @Ernst79

I created a solution for importing data from old Mi Body Composition Scale 2 into Garmin Connect: https://github.com/RobertWojtowicz/export2garmin

I would like to add a new Xiaomi S400 to this integration.

BR,
Robert

Added the scale in 13.2.0-beta for testing. Let me know if it works

@RobertWojtowicz Hi, unlike the Mi Scale V2, the S400's advertised metrics data is encrypted with a unique bind key. With decryption implemented, the actual data can be easily parsed similarly. I guess it would be better to just import ble_monitor and let its parser do all the job.

Added the scale in 13.2.0-beta for testing. Let me know if it works

Appreciate your help, I updated 13.2.0 beta, however my Scale S400 is still not added to BLE Monitor intergration. Can you help to guide me on how to make it works. Sorry, I'm stupid at IT code.

13.2.0-beta not working here too. Only relevant log I could find was Advertisement doesn't contain payload, adv: 0e1695fe1059d53b005e3d47934684

13.2.0-beta not working here too. Only relevant log I could find was Advertisement doesn't contain payload, adv: 0e1695fe1059d53b005e3d47934684

This data doesn't look like anything I've encountered, are you sure it's from a S400? They usually send two types of adv:

1. one regularly with status, model (0x3BD5), MAC addr. Format: 10 59 D53B [1-byte packet ID] [6-byte reversed MAC].
2. another one with metrics data, which is useful. Format: 48 59 D53B [1-byte packet ID] [12-byte encrypted data] [3-byte counter] [4-byte AES-CCM tag]. It's sent out only after measurement (when the display is showing weight / body fat ratio / heart rate).

Added the scale in 13.2.0-beta for testing. Let me know if it works

Appreciate your help, I updated 13.2.0 beta, however my Scale S400 is still not added to BLE Monitor intergration. Can you help to guide me on how to make it works. Sorry, I'm stupid at IT code.

Have you tried the Xiaomi BLE component? I can't test with ble_monitor right now as I only have an ESPHome BLE proxy.

This data doesn't look like anything I've encountered, are you sure it's from a S400?

@zry98 Yes, it's from a S400 MJTZC01YM.

1. one regularly with status, model (0x3BD5), MAC addr. Format: 10 59 D53B [1-byte packet ID] [6-byte reversed MAC].

The ADV from my log does contain 10 59 d53b 00 5e3d47934684 (mac address is correct) which seems like the expected format, but it is padded with some other unknown bytes 0e1695fe

which seems like the expected format

@mukaschultze Any other packet after a measurement?

but it is padded with some other unknown bytes 0e1695fe

It seems to be containing the 16-bit service UUID 0xfe95, no idea on the 0x160e part though.

Added the scale in 13.2.0-beta for testing. Let me know if it works

Appreciate your help, I updated 13.2.0 beta, however my Scale S400 is still not added to BLE Monitor intergration. Can you help to guide me on how to make it works. Sorry, I'm stupid at IT code.

Have you tried the Xiaomi BLE component? I can't test with ble_monitor right now as I only have an ESPHome BLE proxy.

I am using Xiaomi BLE also, but my S400 hasn't been added, only my old scale V2 is added.

So, I was fiddling around with the scale and couldn't get any advertisement other than the one I pasted above. So I decided to test Xiaomi BLE integration, and as soon as I added it the scale started to advertise more data and this integration created new sensors.

The sensors don't have any value, I guess it's somewhat caused by the encryption:

Here's some examples of the new ADV:

• 1b1695fe4859d53b08bc37a22fa9cda5e1f46a7174040000e16950ff
• 1b1695fe4859d53b072071f86385d5ec0c56213983040000fa2b096a

Some devices need to be added to MiHome first, before its starts to send useful data. Next step is getting the encryption key, and add that to the ble monitor settings. You can find the encryption key with one of the methods explained in the FAQ https://custom-components.github.io/ble_monitor/faq#how-to-get-the-mibeacon-v4v5-encryption-key

Like @mukaschultze I have got the scale recognized but unknown data.
I have put the BLE KEY obtained from the Token_extractor program, but it still give "unknown" to all parameters.

Unfortunately, it doesn't work for me either. It finds the device but all sensors are unkown

I've got the same problem.
I've recently update also to 2025.5.0, but i'm unable to make my S400 working. I've got the MAC address, and also the BLE KEY, but sometimes it find the device with all sensor uknown, sometimes is completly unreachable.
I miss my old Mi Scale 2 :(