bleak-retry-connector is a Python library that provides a robust wrapper around Bleak clients, adding automatic reconnection, service caching, and improved error handling for transient Bluetooth LE connection failures. It's built on top of the `bleak` library and is currently at version 4.6.0, with a fairly active release cadence, often updating dependencies and patching bugs.
pip install bleak-retry-connectorVerified import paths — ran on the pinned version, not inferred.
This quickstart demonstrates how to connect to a Bluetooth LE device using `BleakClientWithServiceCache`. It attempts to connect, and if successful, lists its services and tries to read from available characteristics. Remember to replace `DEVICE_ADDRESS` with an actual MAC address or UUID of a nearby BLE device. The retry mechanism is handled automatically by the client.
Ensure your Python environment is 3.10 or higher. Upgrade Python if necessary.
Verify the correct MAC address or UUID of your target BLE device. Ensure the device is powered on, advertising, and within range.
Consult the `bleak` documentation for platform-specific setup and troubleshooting. Ensure Bluetooth services are running correctly on your operating system.
Use a dedicated virtual environment for your project to isolate dependencies. Check the `pyproject.toml` or `setup.cfg` of `bleak-retry-connector` for exact dependency ranges and try to resolve conflicts manually or report to maintainers.
Install the library using pip: `pip install bleak-retry-connector`
Replace direct `BleakClient` usage with `establish_connection` or `BleakClientWithServiceCache` from `bleak_retry_connector` for robust connection handling.
```python
from bleak import BleakScanner
from bleak_retry_connector import establish_connection, BleakClientWithServiceCache
async def connect_to_device(address: str):
device = await BleakScanner.find_device_by_address(address)
if device:
client = await establish_connection(
BleakClientWithServiceCache,
device,
name=device.name or "Unknown Device",
max_attempts=5 # Example: retry 5 times
)
# Use the client
await client.disconnect()
else:
print(f"Device {address} not found")
```Verify the device's MAC address/UUID, ensure the device is powered on, advertising, and within range. Check for Bluetooth service issues on the host operating system.
Disconnect unused Bluetooth devices from the adapter/proxy, reduce the number of simultaneous connections, or add more ESP32 proxies if applicable. This error includes strategies like increasing backoff when slots are exhausted.
While `bleak-retry-connector` is designed to handle transient connection failures, if this error persists, ensure your Python environment is up-to-date, especially `bleak` and `pywinrt` dependencies. For Windows console applications, ensure the threading model is Multi-Threaded Apartment (MTA) by setting `sys.coinit_flags = 0` before importing packages that might initialize COM to STA (like `pythoncom`).