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fix: ble: bluez: force manual MTU negotiation #85

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Merged
merged 1 commit into from
Oct 21, 2025
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fix: ble: bluez: force manual MTU negotiation #85

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6 changes: 6 additions & 0 deletions catprinter/ble.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
from bleak import BleakClient, BleakScanner
from bleak.backends.scanner import AdvertisementData
from bleak.backends.device import BLEDevice
from bleak.backends.bluezdbus.client import BleakClientBlueZDBus
from catprinter import logger

# For some reason, bleak reports the 0xaf30 service on my macOS, while it reports
Expand Down Expand Up @@ -96,6 +97,11 @@ async def run_ble(data, device: Optional[str]):
return
logger.info(f"⏳ Connecting to {address}...")
async with BleakClient(address) as client:
# XXX: BlueZ incorrectly reports a fixed MTU of 23; force MTU negotiation manually.
# https://bleak.readthedocs.io/en/latest/api/client.html#bleak.BleakClient.mtu_size
if isinstance(client, BleakClientBlueZDBus):
await client._acquire_mtu()

logger.info(f"✅ Connected: {client.is_connected}; MTU: {client.mtu_size}")
chunk_size = client.mtu_size - 3
event = asyncio.Event()
Expand Down
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