09cf34c9aa
List of changes: * Retrieve UUID property from Bluez device object before connecting to retrieve UUID contained in advertisement * Read Characteristic User Descriptions attribute of each UUID for mapping endpoint names * To support older implementations with hardcoded Name-UUID map, revert to fallback mode in order if advertisement data has no UUID field
277 lines
11 KiB
Python
277 lines
11 KiB
Python
# Copyright 2018 Espressif Systems (Shanghai) PTE LTD
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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from __future__ import print_function
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from builtins import input
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from future.utils import iteritems
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import platform
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import utils
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fallback = True
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# Check if platform is Linux and required packages are installed
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# else fallback to console mode
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if platform.system() == 'Linux':
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try:
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import dbus
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import dbus.mainloop.glib
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import time
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fallback = False
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except:
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pass
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#--------------------------------------------------------------------
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# BLE client (Linux Only) using Bluez and DBus
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class BLE_Bluez_Client:
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def connect(self, devname, iface, chrc_names, fallback_srv_uuid):
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self.devname = devname
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self.srv_uuid_fallback = fallback_srv_uuid
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self.chrc_names = [name.lower() for name in chrc_names]
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self.device = None
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self.adapter = None
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self.adapter_props = None
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self.services = None
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self.nu_lookup = None
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self.characteristics = dict()
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self.srv_uuid_adv = None
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dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
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bus = dbus.SystemBus()
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manager = dbus.Interface(bus.get_object("org.bluez", "/"), "org.freedesktop.DBus.ObjectManager")
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objects = manager.GetManagedObjects()
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for path, interfaces in iteritems(objects):
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adapter = interfaces.get("org.bluez.Adapter1")
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if adapter != None:
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if path.endswith(iface):
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self.adapter = dbus.Interface(bus.get_object("org.bluez", path), "org.bluez.Adapter1")
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self.adapter_props = dbus.Interface(bus.get_object("org.bluez", path), "org.freedesktop.DBus.Properties")
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break
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if self.adapter == None:
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raise RuntimeError("Bluetooth adapter not found")
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self.adapter_props.Set("org.bluez.Adapter1", "Powered", dbus.Boolean(1))
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self.adapter.StartDiscovery()
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retry = 10
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while (retry > 0):
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try:
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if self.device == None:
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print("Connecting...")
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# Wait for device to be discovered
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time.sleep(5)
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self._connect_()
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print("Connected")
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print("Getting Services...")
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# Wait for services to be discovered
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time.sleep(5)
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self._get_services_()
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return True
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except Exception as e:
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print(e)
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retry -= 1
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print("Retries left", retry)
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continue
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self.adapter.StopDiscovery()
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return False
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def _connect_(self):
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bus = dbus.SystemBus()
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manager = dbus.Interface(bus.get_object("org.bluez", "/"), "org.freedesktop.DBus.ObjectManager")
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objects = manager.GetManagedObjects()
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dev_path = None
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for path, interfaces in iteritems(objects):
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if "org.bluez.Device1" not in interfaces:
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continue
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if interfaces["org.bluez.Device1"].get("Name") == self.devname:
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dev_path = path
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break
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if dev_path == None:
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raise RuntimeError("BLE device not found")
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try:
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self.device = bus.get_object("org.bluez", dev_path)
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try:
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uuids = self.device.Get('org.bluez.Device1', 'UUIDs',
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dbus_interface='org.freedesktop.DBus.Properties')
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# There should be 1 service UUID in advertising data
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# If bluez had cached an old version of the advertisement data
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# the list of uuids may be incorrect, in which case connection
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# or service discovery may fail the first time. If that happens
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# the cache will be refreshed before next retry
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if len(uuids) == 1:
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self.srv_uuid_adv = uuids[0]
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except dbus.exceptions.DBusException as e:
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print(e)
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self.device.Connect(dbus_interface='org.bluez.Device1')
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except Exception as e:
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print(e)
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self.device = None
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raise RuntimeError("BLE device could not connect")
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def _get_services_(self):
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bus = dbus.SystemBus()
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manager = dbus.Interface(bus.get_object("org.bluez", "/"), "org.freedesktop.DBus.ObjectManager")
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objects = manager.GetManagedObjects()
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service_found = False
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for srv_path, srv_interfaces in iteritems(objects):
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if "org.bluez.GattService1" not in srv_interfaces:
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continue
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if not srv_path.startswith(self.device.object_path):
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continue
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service = bus.get_object("org.bluez", srv_path)
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srv_uuid = service.Get('org.bluez.GattService1', 'UUID',
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dbus_interface='org.freedesktop.DBus.Properties')
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# If service UUID doesn't match the one found in advertisement data
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# then also check if it matches the fallback UUID
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if srv_uuid not in [self.srv_uuid_adv, self.srv_uuid_fallback]:
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continue
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nu_lookup = dict()
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characteristics = dict()
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for chrc_path, chrc_interfaces in iteritems(objects):
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if "org.bluez.GattCharacteristic1" not in chrc_interfaces:
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continue
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if not chrc_path.startswith(service.object_path):
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continue
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chrc = bus.get_object("org.bluez", chrc_path)
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uuid = chrc.Get('org.bluez.GattCharacteristic1', 'UUID',
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dbus_interface='org.freedesktop.DBus.Properties')
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characteristics[uuid] = chrc
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for desc_path, desc_interfaces in iteritems(objects):
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if "org.bluez.GattDescriptor1" not in desc_interfaces:
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continue
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if not desc_path.startswith(chrc.object_path):
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continue
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desc = bus.get_object("org.bluez", desc_path)
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desc_uuid = desc.Get('org.bluez.GattDescriptor1', 'UUID',
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dbus_interface='org.freedesktop.DBus.Properties')
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if desc_uuid[4:8] != '2901':
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continue
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try:
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readval = desc.ReadValue({}, dbus_interface='org.bluez.GattDescriptor1')
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except dbus.exceptions.DBusException:
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break
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found_name = ''.join(chr(b) for b in readval).lower()
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nu_lookup[found_name] = uuid
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break
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match_found = True
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for name in self.chrc_names:
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if name not in nu_lookup:
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# Endpoint name not present
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match_found = False
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break
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# Create lookup table only if all endpoint names found
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self.nu_lookup = [None, nu_lookup][match_found]
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self.characteristics = characteristics
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service_found = True
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# If the service UUID matches that in the advertisement
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# we can stop the search now. If it doesn't match, we
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# have found the service corresponding to the fallback
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# UUID, in which case don't break and keep searching
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# for the advertised service
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if srv_uuid == self.srv_uuid_adv:
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break
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if not service_found:
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self.device.Disconnect(dbus_interface='org.bluez.Device1')
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if self.adapter:
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self.adapter.RemoveDevice(self.device)
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self.device = None
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self.nu_lookup = None
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self.characteristics = dict()
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raise RuntimeError("Provisioning service not found")
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def get_nu_lookup(self):
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return self.nu_lookup
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def has_characteristic(self, uuid):
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if uuid in self.characteristics:
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return True
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return False
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def disconnect(self):
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if self.device:
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self.device.Disconnect(dbus_interface='org.bluez.Device1')
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if self.adapter:
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self.adapter.RemoveDevice(self.device)
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self.device = None
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self.nu_lookup = None
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self.characteristics = dict()
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if self.adapter_props:
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self.adapter_props.Set("org.bluez.Adapter1", "Powered", dbus.Boolean(0))
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def send_data(self, characteristic_uuid, data):
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try:
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path = self.characteristics[characteristic_uuid]
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except KeyError:
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raise RuntimeError("Invalid characteristic : " + characteristic_uuid)
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path.WriteValue([ord(c) for c in data], {}, dbus_interface='org.bluez.GattCharacteristic1')
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return ''.join(chr(b) for b in path.ReadValue({}, dbus_interface='org.bluez.GattCharacteristic1'))
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#--------------------------------------------------------------------
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# Console based BLE client for Cross Platform support
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class BLE_Console_Client:
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def connect(self, devname, iface, chrc_names, fallback_srv_uuid):
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print("BLE client is running in console mode")
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print("\tThis could be due to your platform not being supported or dependencies not being met")
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print("\tPlease ensure all pre-requisites are met to run the full fledged client")
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print("BLECLI >> Please connect to BLE device `" + devname + "` manually using your tool of choice")
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resp = input("BLECLI >> Was the device connected successfully? [y/n] ")
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if resp != 'Y' and resp != 'y':
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return False
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print("BLECLI >> List available attributes of the connected device")
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resp = input("BLECLI >> Is the service UUID '" + fallback_srv_uuid + "' listed among available attributes? [y/n] ")
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if resp != 'Y' and resp != 'y':
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return False
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return True
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def get_nu_lookup(self):
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return None
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def has_characteristic(self, uuid):
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resp = input("BLECLI >> Is the characteristic UUID '" + uuid + "' listed among available attributes? [y/n] ")
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if resp != 'Y' and resp != 'y':
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return False
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return True
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def disconnect(self):
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pass
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def send_data(self, characteristic_uuid, data):
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print("BLECLI >> Write following data to characteristic with UUID '" + characteristic_uuid + "' :")
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print("\t>> " + utils.str_to_hexstr(data))
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print("BLECLI >> Enter data read from characteristic (in hex) :")
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resp = input("\t<< ")
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return utils.hexstr_to_str(resp)
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#--------------------------------------------------------------------
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# Function to get client instance depending upon platform
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def get_client():
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if fallback:
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return BLE_Console_Client()
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return BLE_Bluez_Client()
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