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"""
Service Explorer
----------------
An example showing how to access and print out the services, characteristics and
descriptors of a connected GATT server.
Created on 2019-03-25 by hbldh <henrik.blidh@nedomkull.com>
"""
import argparse
import asyncio
import logging
from typing import Optional
from bleak import BleakClient, BleakScanner
logger = logging.getLogger(__name__)
class Args(argparse.Namespace):
name: Optional[str]
address: Optional[str]
macos_use_bdaddr: bool
services: list[str]
pair: bool
debug: bool
async def main(args: Args):
logger.info("starting scan...")
if args.address:
device = await BleakScanner.find_device_by_address(
args.address, cb={"use_bdaddr": args.macos_use_bdaddr}
)
if device is None:
logger.error("could not find device with address '%s'", args.address)
return
elif args.name:
device = await BleakScanner.find_device_by_name(
args.name, cb={"use_bdaddr": args.macos_use_bdaddr}
)
if device is None:
logger.error("could not find device with name '%s'", args.name)
return
else:
raise ValueError("Either --name or --address must be provided")
logger.info("connecting to device...")
async with BleakClient(
device,
pair=args.pair,
services=args.services,
# Give the user plenty of time to enter a PIN code if paring is required.
timeout=90 if args.pair else 10,
) as client:
logger.info("connected to %s (%s)", client.name, client.address)
for service in client.services:
logger.info("[Service] %s", service)
for char in service.characteristics:
if "read" in char.properties:
try:
value = await client.read_gatt_char(char)
extra = f", Value: {value}"
except Exception as e:
extra = f", Error: {e}"
else:
extra = ""
if "write-without-response" in char.properties:
extra += f", Max write w/o rsp size: {char.max_write_without_response_size}"
logger.info(
" [Characteristic] %s (%s)%s",
char,
",".join(char.properties),
extra,
)
for descriptor in char.descriptors:
try:
value = await client.read_gatt_descriptor(descriptor)
logger.info(" [Descriptor] %s, Value: %r", descriptor, value)
except Exception as e:
logger.error(" [Descriptor] %s, Error: %s", descriptor, e)
logger.info("disconnecting...")
logger.info("disconnected")
if __name__ == "__main__":
parser = argparse.ArgumentParser()
device_group = parser.add_mutually_exclusive_group(required=True)
device_group.add_argument(
"--name",
metavar="<name>",
help="the name of the bluetooth device to connect to",
)
device_group.add_argument(
"--address",
metavar="<address>",
help="the address of the bluetooth device to connect to",
)
parser.add_argument(
"--macos-use-bdaddr",
action="store_true",
help="when true use Bluetooth address instead of UUID on macOS",
)
parser.add_argument(
"--services",
nargs="+",
metavar="<uuid>",
help="if provided, only enumerate matching service(s)",
)
parser.add_argument(
"--pair",
action="store_true",
help="pair with the device before connecting if not already paired",
)
parser.add_argument(
"-d",
"--debug",
action="store_true",
help="sets the log level to debug",
)
args = parser.parse_args(namespace=Args())
log_level = logging.DEBUG if args.debug else logging.INFO
logging.basicConfig(
level=log_level,
format="%(asctime)-15s %(name)-8s %(levelname)s: %(message)s",
)
asyncio.run(main(args))
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