esp-idf/tools/esp_prov/transport/transport_ble.py

51 wiersze
2.2 KiB
Python

# SPDX-FileCopyrightText: 2018-2023 Espressif Systems (Shanghai) CO LTD
# SPDX-License-Identifier: Apache-2.0
#
from . import ble_cli
from .transport import Transport
class Transport_BLE(Transport):
def __init__(self, service_uuid, nu_lookup):
self.nu_lookup = nu_lookup
self.service_uuid = service_uuid
self.name_uuid_lookup = None
# Expect service UUID like '0000ffff-0000-1000-8000-00805f9b34fb'
for name in nu_lookup.keys():
# Calculate characteristic UUID for each endpoint
nu_lookup[name] = service_uuid[:4] + '{:02x}'.format(
int(nu_lookup[name], 16) & int(service_uuid[4:8], 16)) + service_uuid[8:]
# Get BLE client module
self.cli = ble_cli.get_client()
async def connect(self, devname):
# Use client to connect to BLE device and bind to service
if not await self.cli.connect(devname=devname, iface='hci0',
chrc_names=self.nu_lookup.keys(),
fallback_srv_uuid=self.service_uuid):
raise RuntimeError('Failed to initialize transport')
# Irrespective of provided parameters, let the client
# generate a lookup table by reading advertisement data
# and characteristic user descriptors
self.name_uuid_lookup = self.cli.get_nu_lookup()
# If that doesn't work, use the lookup table provided as parameter
if self.name_uuid_lookup is None:
self.name_uuid_lookup = self.nu_lookup
# Check if expected characteristics are provided by the service
for name in self.name_uuid_lookup.keys():
if not self.cli.has_characteristic(self.name_uuid_lookup[name]):
raise RuntimeError(f"'{name}' endpoint not found")
async def disconnect(self):
await self.cli.disconnect()
async def send_data(self, ep_name, data):
# Write (and read) data to characteristic corresponding to the endpoint
if ep_name not in self.name_uuid_lookup.keys():
raise RuntimeError(f'Invalid endpoint: {ep_name}')
return await self.cli.send_data(self.name_uuid_lookup[ep_name], data)