59 lines
2.2 KiB
Python
59 lines
2.2 KiB
Python
# Copyright 2018 Espressif Systems (Shanghai) PTE LTD
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
#
|
|
|
|
from __future__ import print_function
|
|
|
|
from .transport import Transport
|
|
|
|
from . import ble_cli
|
|
|
|
|
|
class Transport_BLE(Transport):
|
|
def __init__(self, devname, service_uuid, nu_lookup):
|
|
# 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:]
|
|
self.name_uuid_lookup = nu_lookup
|
|
|
|
# Get BLE client module
|
|
self.cli = ble_cli.get_client()
|
|
|
|
# Use client to connect to BLE device and bind to service
|
|
if not self.cli.connect(devname=devname, iface='hci0', srv_uuid=service_uuid):
|
|
raise RuntimeError("Failed to initialize transport")
|
|
|
|
# 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("'" + name + "' endpoint not found")
|
|
|
|
def __del__(self):
|
|
# Make sure device is disconnected before application gets closed
|
|
try:
|
|
self.disconnect()
|
|
except Exception:
|
|
pass
|
|
|
|
def disconnect(self):
|
|
self.cli.disconnect()
|
|
|
|
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("Invalid endpoint : " + ep_name)
|
|
return self.cli.send_data(self.name_uuid_lookup[ep_name], data)
|