aiobmsble 0.17.0
Asynchronous Python library to query battery management systems via Bluetooth Low Energy.
Requires Python: >=3.12
Keywords: BMS, BLE, battery, Bluetooth

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# Aiobmsble
Requires Python 3 and uses [asyncio](https://docs.python.org/3/library/asyncio.html) and [Bleak](https://pypi.org/project/bleak/)

## Asynchronous Library to Query Battery Management Systems via Bluetooth LE
This library is intended to query data from battery management systems that use Bluetooth LE. Stand-alone usage is possible in any Python environment (with necessary dependencies installed). It is developed to support [BMS_BLE-HA integration](https://github.com/patman15/BMS_BLE-HA/) that was written to make BMS data available to Home Assistant, but can be hopefully useful for other use-cases as well.

* [Features](#features)
* [Usage](#usage)
* [Installation](#installation)
* [Troubleshooting](#troubleshooting)
* [Thanks to](#thanks-to)
* [References](#references)

## Features
- Support for autodetecting compatible BLE BMSs
- Automatic detection of compatible BLE write mode
- Asynchronous operation using [asyncio](https://docs.python.org/3/library/asyncio.html)
- Any number of batteries in parallel
- 100% test coverage plus fuzz tests for BLE data

> [!CAUTION]
> This library **shall not be used for safety relevant operations**! The correctness or availability of data cannot be guaranteed (see [warranty section of the license](LICENSE)),
> since the implementation is mostly based on openly available information or non-validated vendor specifications.
> Further, issues with the Bluetooth connection, e.g. disturbances, can lead to unavailable or incorrect values.
> 
> **Do not rely** on the values to control actions that prevent battery damage, overheating (fire), or similar.

### Supported Devices
The [list of supported devices](https://github.com/patman15/BMS_BLE-HA?tab=readme-ov-file#supported-devices) is maintained in the repository of the related [Home Assistant integration](https://github.com/patman15/BMS_BLE-HA).
For details about the supported data per BMS, please have a look at [BMS data table](https://github.com/patman15/aiobmsble/blob/main/docs/available_bms_data.csv):
- A `✓` means that the field is directly available from the BMS.
- A `.` means that the field is not natively available, but all required fields for its calculation are available.
- Empty means that the field is not available at all.

### [API documentation](https://patman15.github.io/aiobmsble/)
The project uses [pdoc](https://pdoc.dev/) to generate the [API documentation](https://patman15.github.io/aiobmsble/). You can generate it locally using the [installation for development](#for-development) and then running the command
```bash
pdoc 'aiobmsble' '!aiobmsble.bms' -o docs
```
which will generate the documentation locally in the `/docs` folder.


## Usage
In order to identify all devices that are reachable and supported by the library, simply run
```bash
aiobmsble
```
from the command line after [installation](#installation). 

### From your Python code
In case you need a reference to include the code into your library, please see [\_\_main\_\_.py](/aiobmsble/__main__.py).

### From a Script
This example can also be found as an [example](/examples/minimal.py) in the respective [folder](/main/examples).
```python
"""Example of using the aiobmsble library to find a BLE device by name and print its sensor data.

Project: aiobmsble, https://pypi.org/p/aiobmsble/
License: Apache-2.0, http://www.apache.org/licenses/
"""

import asyncio
import logging
from typing import Final

from bleak import BleakScanner
from bleak.backends.device import BLEDevice
from bleak.exc import BleakError

from aiobmsble import BMSSample
from aiobmsble.bms.dummy_bms import BMS  # TODO: use the right BMS class for your device

NAME: Final[str] = "BT Device Name"  # TODO: replace with the name of your BLE device

# Configure logging
logging.basicConfig(level=logging.INFO)
logger: logging.Logger = logging.getLogger(__name__)


async def main(dev_name: str) -> None:
    """Find a BLE device by name and update its sensor data."""

    device: BLEDevice | None = await BleakScanner.find_device_by_name(dev_name)
    if device is None:
        logger.error("Device '%s' not found.", dev_name)
        return

    logger.info("Found device: %s (%s)", device.name, device.address)
    try:
        async with BMS(ble_device=device) as bms:
            logger.info("Updating BMS data...")
            data: BMSSample = await bms.async_update()
            logger.info("BMS data: %s", repr(data).replace(", ", ",\n\t"))
    except BleakError as ex:
        logger.error("Failed to update BMS: %s", type(ex).__name__)


if __name__ == "__main__":
    asyncio.run(main(NAME))  # pragma: no cover
```

### Testing
For integration tests (using pytest) the library provides advertisement data that can be used to verify detection of BMSs. For your tests you can use

```python
from aiobmsble.test_data import bms_advertisements

def test_advertisements() -> None:
    """Run some tests with the advertisements"""
    for advertisement, bms_type, _comments in bms_advertisements():
        ...
```

## Installation
Install python and pip if you have not already, then run:
```bash
pip3 install pip --upgrade
pip3 install wheel
```

### For Production:

```bash
pip3 install aiobmsble
```
This will install the latest library release and all of it's python dependencies.

### For Development:
```bash
git clone https://github.com/patman15/aiobmsble.git
cd aiobmsble
pip3 install -e .[dev]
```
This gives you the latest library code from the main branch.

## Troubleshooting
In case you have problems with the library, please enable debug logging. You can also run `aiobmsble -v` from the command line in order to query all known BMS that are reachable.

### In case you have troubles you'd like to have help with 

- please record a debug log using `aiobmsble -v -l debug.log`,
- [open an issue](https://github.com/patman15/aiobmsble/issues/new?assignees=&labels=question&projects=&template=support.yml) with a good description of what your question/issue is and attach the log, or
- [open a bug](https://github.com/patman15/aiobmsble/issues/new?assignees=&labels=Bug&projects=&template=bug.yml) if you think the behaviour you see is misbehaviour of the library, including a good description of what happened, your expectations,
- and put the `debug.log` **as attachment** to the issue.

## Thanks to
> [@gkathan](https://github.com/patman15/BMS_BLE-HA/issues/2), [@downset](https://github.com/patman15/BMS_BLE-HA/issues/19), [@gerritb](https://github.com/patman15/BMS_BLE-HA/issues/22), [@Goaheadz](https://github.com/patman15/BMS_BLE-HA/issues/24), [@alros100, @majonessyltetoy](https://github.com/patman15/BMS_BLE-HA/issues/52), [@snipah, @Gruni22](https://github.com/patman15/BMS_BLE-HA/issues/59), [@azisto](https://github.com/patman15/BMS_BLE-HA/issues/78), [@BikeAtor, @Karatzie](https://github.com/patman15/BMS_BLE-HA/issues/57), [@PG248](https://github.com/patman15/BMS_BLE-HA/issues/85), [@SkeLLLa,@romanshypovskyi](https://github.com/patman15/BMS_BLE-HA/issues/90), [@riogrande75, @ebagnoli, @andreas-bulling](https://github.com/patman15/BMS_BLE-HA/issues/101), [@goblinmaks, @andreitoma-github](https://github.com/patman15/BMS_BLE-HA/issues/102), [@hacsler](https://github.com/patman15/BMS_BLE-HA/issues/103), [@ViPeR5000](https://github.com/patman15/BMS_BLE-HA/pull/182), [@edelstahlratte](https://github.com/patman15/BMS_BLE-HA/issues/161), [@nezra](https://github.com/patman15/BMS_BLE-HA/issues/164), [@Fandu21](https://github.com/patman15/BMS_BLE-HA/issues/194), [@rubenclark74](https://github.com/patman15/BMS_BLE-HA/issues/186), [@geierwally1978](https://github.com/patman15/BMS_BLE-HA/issues/240), [@Tulexcorp](https://github.com/patman15/BMS_BLE-HA/issues/271), [@oliviercommelarbre](https://github.com/patman15/BMS_BLE-HA/issues/279), [@shaf](https://github.com/patman15/BMS_BLE-HA/issues/286), [@gavrilov](https://github.com/patman15/BMS_BLE-HA/issues/247), [@SOLAR-RAIDER](https://github.com/patman15/BMS_BLE-HA/issues/291), [@prodisz](https://github.com/patman15/BMS_BLE-HA/issues/303), [@thecodingmax](https://github.com/patman15/BMS_BLE-HA/issues/390), [@daubman](https://github.com/patman15/BMS_BLE-HA/pull/413), [@krahabb](https://github.com/patman15/BMS_BLE-HA/pull/468), [@ardeus-ua](https://github.com/patman15/BMS_BLE-HA/issues/521), [@GlennDC](https://github.com/patman15/aiobmsble/issues/65), [@hhgerhard-google](https://github.com/patman15/BMS_BLE-HA/issues/537), [@crotwell](https://github.com/patman15/aiobmsble/issues/64), [@dschenzer](https://github.com/patman15/aiobmsble/pull/128)

for helping with making the library better.

## References
- ANT BMS: [esphome-ant-bms](https://github.com/syssi/esphome-ant-bms/)
- Daly BMS: [esp32-smart-bms-simulation](https://github.com/roccotsi2/esp32-smart-bms-simulation)
- Jikong BMS: [esphome-jk-bms](https://github.com/syssi/esphome-jk-bms)
- JBD BMS: [esphome-jbd-bms](https://github.com/syssi/esphome-jbd-bms)
- D-powercore BMS: [Strom BMS monitor](https://github.com/majonessyltetoy/strom)
- Pro BMS: [@daubman](https://github.com/patman15/BMS_BLE-HA/docs/pro_bms.md)
- Redodo BMS: [LiTime BMS Bluetooth](https://github.com/calledit/LiTime_BMS_bluetooth)
- TianPower BMS: [esphome-tianpower-bms](https://github.com/syssi/esphome-tianpower-bms)

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