Unreliable syncronization

[stheid]

Sorry for opening so many issues. I am actually very thankful for the work done :) Maybe I can also help to develop with some assistance...

I have used the BU580 today a couple of times. However, the only sensor that is reliably updated after each reading is the Bluetooth signal strength. Is there any way to debug that?

When the HA sensors are updated, they are often not even updated with the most recent measurement. It seems as if the Bluetooth advertisement contains multiple readings and the integration only takes one of them and puts it in HA?

I have already looked in the HA logs, but there are only a couple of error messages related to unsuccessful polling attempts. (which does not seem to be related)

This error originated from a custom integration.

Logger: custom_components.medisanabp_ble
Source: components/bluetooth/active_update_processor.py:125
integration: Medisana Blood Pressure BLE (documentation, issues)
First occurred: January 10, 2025 at 15:26:46 (2 occurrences)
Last logged: January 10, 2025 at 15:47:33

18:7A:93:E9:0C:F0: Bluetooth error whilst polling: 18:7A:93:E9:0C:F0 - 18:7A:93:E9:0C:F0: Failed to connect after 11 attempt(s): No backend with an available connection slot that can reach address 18:7A:93:E9:0C:F0 was found: The proxy/adapter is out of connection slots or the device is no longer reachable; Add additional proxies (https://esphome.github.io/bluetooth-proxies/) near this device
18:7A:93:E9:0C:F0: Bluetooth error whilst polling: 18:7A:93:E9:0C:F0 - 18:7A:93:E9:0C:F0: Failed to connect after 10 attempt(s): No backend with an available connection slot that can reach address 18:7A:93:E9:0C:F0 was found: The proxy/adapter is out of connection slots or the device is no longer reachable; Add additional proxies (https://esphome.github.io/bluetooth-proxies/) near this device

[Slomo17]

My BU580 doesn't work at all. It shows that the device is discovered and i can add it but i don't get any sensor entities at all, only a disabled signal strength. If i enable the sensor i get a value which never changes.

[stheid]

yeah... the first synchronization worked flawless, aber after than almost always only the signal strength is updated...

[bkbilly]

The synchronization issue you are facing might be because of low signal, or not enough active connections available on your adapter.

[RaveGun]

... or not enough active connections available on your adapter.

Hello, I don't really know what "active connections" mean but I just found out that my BLE Proxy was not doing anything any more.

I am in the process of moving my HA install from one machine to another. Unfortunately the ESP32 BLE Proxy was connected to the new machine that is idling and not to the old (current) machine that is still doing the job. Now I found out that an ESP32 BLE proxy can only have one API connection open. So it was either the old or the new one.

Now, that I removed the device from the new machine, my old one connected correctly to and also received a measurement and the BU580 did showed any E4 error.

There is still an issue with the measurement date in the log:

Error while setting up medisanabp_ble platform for sensor: Invalid datetime: sensor.18_7a_93_e9_0f_b1_0fb1_measured_date has timestamp device class but provides state 2025-03-03T14:53:00:<class 'str'> resulting in ''str' object has no attribute 'tzinfo''

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/sensor/__init__.py", line 572, in state
    if value.tzinfo is None:
       ^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'tzinfo'

Is there something I can change or try?

Thank you.

[bkbilly]

I don't have any clue on why you get this error...

[RaveGun]

I removed the code from the parser locally for the measurement date. Now, I do not get any errors in the log about the time zone.

But in order to get a new reading, I have to reload the device while the BPM is trying to connect.

[RaveGun]

I don't have any clue on why you get this error...

Maybe is my supervised installation that is not 100% conform with the HA requirements.

[Slomo17]

The synchronization issue you are facing might be because of low signal, or not enough active connections available on your adapter.

I tested it right besides the bluetooth proxy (ESP32), which only has one other connected bluetooth device, so i don't think this is the problem.

[benehalb]

yeah... the first synchronization worked flawless, aber after than almost always only the signal strength is updated...

I am experiencing the same issue. Have you ever figured out what one can do to get around this problem? Thank you all :)

[stheid]

I havent used it recently due to the updates almost never working. I have not found time to dive into development myself.

[daichidan]

I have BU570 and I also have the same issue :/

yeah... the first synchronization worked flawless, aber after than almost always only the signal strength is updated...

[michaelmell]

First off: I am very grateful for this HA custom component! Thank you so much for putting effort into it. :)

I am experiencing the same issue as this:

yeah... the first synchronization worked flawless, aber after than almost always only the signal strength is updated...

I also have a Medisana BU570 Connect as @daichidan .

In my case, it only synchronized the recorded data only once so far. Now it only synchronizes signal strength. I believe this was through the Bluetooth of my Raspberry PI on which I have HAOS installed. I also tried a vanilla BT proxy setup as described here (the generic version).

I would like to help and fix this:
I would start of by installing a previous version to test, if older version also exhibit this issue. Which version would be a good candidate.

Thank you in advance for any input.

Kind regards,
Michael

[Rudertier]

Hey! I recently got a BU570 myself, and now I want to fix the issue. I started by placing a bunch of debug messages and now I'm trying to understand why the sensor data is not set. I see that

 @retry_bluetooth_connection_error()
    def notification_handler(self, _:BleakGATTCharacteristic, data:bytearray) -> None:
        _LOGGER.warning("Calling 'notification_handler' data: %s", data)

is called and that the data is correctly read.

        _LOGGER.warning(
            "Got data from BPM device (datetime: %s, syst: %s, diast: %s, arter: %s, puls: %s, user: %s)",
            datetime_str, syst, diast, arter, puls, user)

        self.update_sensor(
            key=str(MedisanaBPSensor.SYSTOLIC),
            native_unit_of_measurement=Units.PRESSURE_MMHG,
            native_value=syst,
            device_class=SensorDeviceClass.PRESSURE,
            name="Systolic",
        )
        self.update_sensor(
            key=str(MedisanaBPSensor.DIASTOLIC),
            native_unit_of_measurement=Units.PRESSURE_MMHG,
            ....

gives: Got data from BPM device (datetime: 2025/7/15 15:00, syst: 123, diast: 45, arter: 678, puls: 90, user: 1)

However, the Sensor values are not updated. Any ideas anyone?

btw, i changed the values in the log. They are more resonable in reality.

[Rudertier]

Hello,

After trying to fix the issue for some time, I ended up building my own integration from scratch. If you’re interested, you’re welcome to try it out.

• Integration Type: My version is a local_push integration reacting to BLE advertisements; the original uses polling.
• Data Retention: Missed measurements are stored in the "Last Measurement" sensor; the original may only store the latest data.

Link: github.com/Rudertier/medisana_blood_pressure

[de-andrei]

@stheid Rudertier/medisana_blood_pressure#9