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esp-idf/tools/ble/lib_ble_client.py

806 wiersze
28 KiB
Python
Czysty Wina Historia

#!/usr/bin/env python
#
# Copyright 2019 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.
#
# DBus-Bluez BLE library
from __future__ import print_function
import sys
import time
try:
from future.moves.itertools import zip_longest
import dbus
import dbus.mainloop.glib
from gi.repository import GLib
except ImportError as e:
if 'linux' not in sys.platform:
sys.exit("Error: Only supported on Linux platform")
print(e)
print("Install packages `libgirepository1.0-dev gir1.2-gtk-3.0 libcairo2-dev libdbus-1-dev libdbus-glib-1-dev` for resolving the issue")
print("Run `pip install -r $IDF_PATH/tools/ble/requirements.txt` for resolving the issue")
raise
import lib_gatt
import lib_gap
srv_added_old_cnt = 0
srv_added_new_cnt = 0
blecent_retry_check_cnt = 0
verify_service_cnt = 0
verify_readchars_cnt = 0
blecent_adv_uuid = '1811'
iface_added = False
gatt_app_obj_check = False
gatt_app_reg_check = False
adv_data_check = False
adv_reg_check = False
read_req_check = False
write_req_check = False
subscribe_req_check = False
ble_hr_chrc = False
DISCOVERY_START = False
TEST_CHECKS_PASS = False
ADV_STOP = False
SERVICES_RESOLVED = False
SERVICE_UUID_FOUND = False
BLUEZ_SERVICE_NAME = 'org.bluez'
DBUS_OM_IFACE = 'org.freedesktop.DBus.ObjectManager'
DBUS_PROP_IFACE = 'org.freedesktop.DBus.Properties'
ADAPTER_IFACE = 'org.bluez.Adapter1'
DEVICE_IFACE = 'org.bluez.Device1'
GATT_MANAGER_IFACE = 'org.bluez.GattManager1'
LE_ADVERTISING_MANAGER_IFACE = 'org.bluez.LEAdvertisingManager1'
GATT_SERVICE_IFACE = 'org.bluez.GattService1'
GATT_CHRC_IFACE = 'org.bluez.GattCharacteristic1'
ADAPTER_ON = False
DEVICE_CONNECTED = False
GATT_APP_REGISTERED = False
ADV_REGISTERED = False
ADV_ACTIVE_INSTANCE = False
CHRC_VALUE_CNT = False
# Set up the main loop.
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
dbus.mainloop.glib.threads_init()
# Set up the event main loop.
event_loop = GLib.MainLoop()
def set_props_status(props):
"""
Set Adapter status if it is powered on or off
"""
global ADAPTER_ON, SERVICES_RESOLVED, GATT_OBJ_REMOVED, GATT_APP_REGISTERED, \
ADV_REGISTERED, ADV_ACTIVE_INSTANCE, DEVICE_CONNECTED, CHRC_VALUE, CHRC_VALUE_CNT
is_service_uuid = False
# Signal caught for change in Adapter Powered property
if 'Powered' in props:
if props['Powered'] == 1:
ADAPTER_ON = True
else:
ADAPTER_ON = False
event_loop.quit()
elif 'ServicesResolved' in props:
if props['ServicesResolved'] == 1:
SERVICES_RESOLVED = True
else:
SERVICES_RESOLVED = False
elif 'UUIDs' in props:
# Signal caught for add/remove GATT data having service uuid
for uuid in props['UUIDs']:
if blecent_adv_uuid in uuid:
is_service_uuid = True
if not is_service_uuid:
# Signal caught for removing GATT data having service uuid
# and for unregistering GATT application
GATT_APP_REGISTERED = False
lib_gatt.GATT_APP_OBJ = False
elif 'ActiveInstances' in props:
# Signal caught for Advertising - add/remove Instances property
if props['ActiveInstances'] == 1:
ADV_ACTIVE_INSTANCE = True
elif props['ActiveInstances'] == 0:
ADV_ACTIVE_INSTANCE = False
ADV_REGISTERED = False
lib_gap.ADV_OBJ = False
elif 'Connected' in props:
# Signal caught for device connect/disconnect
if props['Connected'] is True:
DEVICE_CONNECTED = True
event_loop.quit()
else:
DEVICE_CONNECTED = False
elif 'Value' in props:
# Signal caught for change in chars value
if ble_hr_chrc:
CHRC_VALUE_CNT += 1
print(props['Value'])
if CHRC_VALUE_CNT == 10:
event_loop.quit()
def props_change_handler(iface, changed_props, invalidated):
"""
PropertiesChanged Signal handler.
Catch and print information about PropertiesChanged signal.
"""
if iface == ADAPTER_IFACE:
set_props_status(changed_props)
if iface == LE_ADVERTISING_MANAGER_IFACE:
set_props_status(changed_props)
if iface == DEVICE_IFACE:
set_props_status(changed_props)
if iface == GATT_CHRC_IFACE:
set_props_status(changed_props)
class BLE_Bluez_Client:
def __init__(self, iface, devname=None, devaddr=None):
self.bus = None
self.device = None
self.devname = devname
self.devaddr = devaddr
self.iface = iface
self.ble_objs = None
self.props_iface_obj = None
self.adapter_path = []
self.adapter = None
self.services = []
self.srv_uuid = []
self.chars = {}
self.char_uuid = []
try:
self.bus = dbus.SystemBus()
om_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, "/"), DBUS_OM_IFACE)
self.ble_objs = om_iface_obj.GetManagedObjects()
except Exception as e:
print(e)
def __del__(self):
try:
print("Test Exit")
except Exception as e:
print(e)
sys.exit(1)
def set_adapter(self):
'''
Discover Bluetooth Adapter
Power On Bluetooth Adapter
'''
try:
print("discovering adapter...")
for path, interfaces in self.ble_objs.items():
adapter = interfaces.get(ADAPTER_IFACE)
if adapter is not None:
if path.endswith(self.iface):
self.adapter = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, path), ADAPTER_IFACE)
# Create Properties Interface object only after adapter is found
self.props_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, path), DBUS_PROP_IFACE)
self.adapter_path = [path, interfaces]
# Check adapter status - power on/off
set_props_status(interfaces[ADAPTER_IFACE])
break
if self.adapter is None:
raise RuntimeError("\nError: bluetooth adapter not found")
if self.props_iface_obj is None:
raise RuntimeError("\nError: properties interface not found")
print("bluetooth adapter discovered")
self.props_iface_obj.connect_to_signal('PropertiesChanged', props_change_handler)
# Check if adapter is already powered on
if ADAPTER_ON:
print("bluetooth adapter is already on")
return True
# Power On Adapter
print("powering on adapter...")
self.props_iface_obj.Set(ADAPTER_IFACE, "Powered", dbus.Boolean(1))
event_loop.run()
if ADAPTER_ON:
print("bluetooth adapter powered on")
return True
else:
print("Failure: bluetooth adapter not powered on")
return False
except Exception as e:
print(e)
sys.exit(1)
def connect(self):
'''
Connect to the device discovered
Retry 10 times to discover and connect to device
'''
global DISCOVERY_START
device_found = False
try:
self.adapter.StartDiscovery()
print("\nStarted Discovery")
DISCOVERY_START = True
for retry_cnt in range(10,0,-1):
try:
if self.device is None:
print("\nConnecting to device...")
# Wait for device to be discovered
time.sleep(5)
device_found = self.get_device()
if device_found:
self.device.Connect(dbus_interface=DEVICE_IFACE)
event_loop.quit()
print("\nConnected to device")
return True
except Exception as e:
print(e)
print("\nRetries left", retry_cnt - 1)
continue
# Device not found
return False
except Exception as e:
print(e)
self.device = None
return False
def get_device(self):
'''
Discover device based on device name
and device address and connect
'''
dev_path = None
om_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, "/"), DBUS_OM_IFACE)
self.ble_objs = om_iface_obj.GetManagedObjects()
for path, interfaces in self.ble_objs.items():
if DEVICE_IFACE not in interfaces.keys():
continue
device_addr_iface = (path.replace('_', ':')).lower()
dev_addr = self.devaddr.lower()
if dev_addr in device_addr_iface and \
interfaces[DEVICE_IFACE].get("Name") == self.devname:
dev_path = path
break
if dev_path is None:
print("\nBLE device not found")
return False
device_props_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, dev_path), DBUS_PROP_IFACE)
device_props_iface_obj.connect_to_signal('PropertiesChanged', props_change_handler)
self.device = self.bus.get_object(BLUEZ_SERVICE_NAME, dev_path)
return True
def srvc_iface_added_handler(self, path, interfaces):
'''
Add services found as lib_ble_client obj
'''
if self.device and path.startswith(self.device.object_path):
if GATT_SERVICE_IFACE in interfaces.keys():
service = self.bus.get_object(BLUEZ_SERVICE_NAME, path)
uuid = service.Get(GATT_SERVICE_IFACE, 'UUID', dbus_interface=DBUS_PROP_IFACE)
if uuid not in self.srv_uuid:
self.srv_uuid.append(uuid)
if path not in self.services:
self.services.append(path)
def verify_get_services(self):
global SERVICE_SCAN_FAIL, verify_service_cnt
verify_service_cnt += 1
if iface_added and self.services and SERVICES_RESOLVED:
event_loop.quit()
if verify_service_cnt == 10:
event_loop.quit()
def verify_service_uuid_found(self):
'''
Verify service uuid found
'''
global SERVICE_UUID_FOUND
srv_uuid_found = [uuid for uuid in self.srv_uuid if service_uuid in uuid]
if srv_uuid_found:
SERVICE_UUID_FOUND = True
def get_services(self, srv_uuid=None):
'''
Retrieve Services found in the device connected
'''
global service_uuid, iface_added, SERVICE_UUID_FOUND
service_uuid = srv_uuid
iface_added = False
SERVICE_UUID_FOUND = False
try:
om_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, "/"), DBUS_OM_IFACE)
self.ble_objs = om_iface_obj.GetManagedObjects()
for path, interfaces in self.ble_objs.items():
self.srvc_iface_added_handler(path, interfaces)
# If services not found, then they may not have been added yet on dbus
if not self.services:
iface_added = True
GLib.timeout_add_seconds(2, self.verify_get_services)
om_iface_obj.connect_to_signal('InterfacesAdded', self.srvc_iface_added_handler)
event_loop.run()
if service_uuid:
self.verify_service_uuid_found()
if not SERVICE_UUID_FOUND:
raise Exception("Service with uuid: %s not found !!!" % service_uuid)
return self.srv_uuid
except Exception as e:
print("Error: ", e)
return False
def chrc_iface_added_handler(self, path, interfaces):
'''
Add services found as lib_ble_client obj
'''
global chrc, chrc_discovered
chrc_val = None
if self.device and path.startswith(self.device.object_path):
if GATT_CHRC_IFACE in interfaces.keys():
chrc = self.bus.get_object(BLUEZ_SERVICE_NAME, path)
chrc_props = chrc.GetAll(GATT_CHRC_IFACE,
dbus_interface=DBUS_PROP_IFACE)
chrc_flags = chrc_props['Flags']
if 'read' in chrc_flags:
chrc_val = chrc.ReadValue({}, dbus_interface=GATT_CHRC_IFACE)
uuid = chrc_props['UUID']
self.chars[path] = chrc_val, chrc_flags, uuid
def verify_get_chars(self):
global verify_readchars_cnt
verify_readchars_cnt += 1
if iface_added and self.chars:
event_loop.quit()
if verify_readchars_cnt == 10:
event_loop.quit()
def read_chars(self):
'''
Read characteristics found in the device connected
'''
global iface_added, chrc_discovered
chrc_discovered = False
iface_added = False
try:
om_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, "/"), DBUS_OM_IFACE)
self.ble_objs = om_iface_obj.GetManagedObjects()
for path, interfaces in self.ble_objs.items():
self.chrc_iface_added_handler(path, interfaces)
# If chars not found, then they have not been added yet to interface
if not self.chars:
iface_added = True
GLib.timeout_add_seconds(2, self.verify_get_chars)
om_iface_obj.connect_to_signal('InterfacesAdded', self.chars_iface_added_handler)
event_loop.run()
return self.chars
except Exception as e:
print("Error: ", e)
return False
def write_chars(self, write_val):
'''
Write characteristics to the device connected
'''
chrc = None
chrc_val = None
char_write_props = False
try:
for path, props in self.chars.items():
if 'write' in props[1]: # check permission
char_write_props = True
chrc = self.bus.get_object(BLUEZ_SERVICE_NAME, path)
chrc.WriteValue(write_val,{},dbus_interface=GATT_CHRC_IFACE)
if 'read' in props[1]:
chrc_val = chrc.ReadValue({}, dbus_interface=GATT_CHRC_IFACE)
else:
print("Warning: Cannot read value. Characteristic does not have read permission.")
if not (ord(write_val) == int(chrc_val[0])):
print("\nWrite Failed")
return False
self.chars[path] = chrc_val, props[1], props[2] # update value
if not char_write_props:
print("Failure: Cannot perform write operation. Characteristic does not have write permission.")
return False
return self.chars
except Exception as e:
print(e)
return False
def hr_update_simulation(self, hr_srv_uuid, hr_char_uuid):
'''
Start Notifications
Retrieve updated value
Stop Notifications
'''
global ble_hr_chrc
srv_path = None
chrc = None
uuid = None
chrc_path = None
chars_ret = None
ble_hr_chrc = True
try:
# Get HR Measurement characteristic
services = list(zip_longest(self.srv_uuid, self.services))
for uuid, path in services:
if hr_srv_uuid in uuid:
srv_path = path
break
if srv_path is None:
print("Failure: HR UUID:", hr_srv_uuid, "not found")
return False
chars_ret = self.read_chars()
for path, props in chars_ret.items():
if path.startswith(srv_path):
chrc = self.bus.get_object(BLUEZ_SERVICE_NAME, path)
chrc_path = path
if hr_char_uuid in props[2]: # uuid
break
if chrc is None:
print("Failure: Characteristics for service: ", srv_path, "not found")
return False
# Subscribe to notifications
print("\nSubscribe to notifications: On")
chrc.StartNotify(dbus_interface=GATT_CHRC_IFACE)
chrc_props_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, chrc_path), DBUS_PROP_IFACE)
chrc_props_iface_obj.connect_to_signal('PropertiesChanged', props_change_handler)
event_loop.run()
chrc.StopNotify(dbus_interface=GATT_CHRC_IFACE)
time.sleep(2)
print("\nSubscribe to notifications: Off")
ble_hr_chrc = False
return True
except Exception as e:
print(e)
return False
def create_gatt_app(self):
'''
Create GATT data
Register GATT Application
'''
global gatt_app_obj, gatt_manager_iface_obj
gatt_app_obj = None
gatt_manager_iface_obj = None
try:
gatt_app_obj = lib_gatt.Application(self.bus, self.adapter_path[0])
gatt_manager_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME,self.adapter_path[0]), GATT_MANAGER_IFACE)
gatt_manager_iface_obj.RegisterApplication(gatt_app_obj, {},
reply_handler=self.gatt_app_handler,
error_handler=self.gatt_app_error_handler)
return True
except Exception as e:
print(e)
return False
def gatt_app_handler(self):
'''
GATT Application Register success handler
'''
global GATT_APP_REGISTERED
GATT_APP_REGISTERED = True
def gatt_app_error_handler(self, error):
'''
GATT Application Register error handler
'''
global GATT_APP_REGISTERED
GATT_APP_REGISTERED = False
def start_advertising(self, adv_host_name, adv_iface_index, adv_type, adv_uuid):
'''
Create Advertising data
Register Advertisement
Start Advertising
'''
global le_adv_obj, le_adv_manager_iface_obj
le_adv_obj = None
le_adv_manager_iface_obj = None
le_adv_iface_path = None
try:
print("Advertising started")
gatt_app_ret = self.create_gatt_app()
if not gatt_app_ret:
return False
for path,interface in self.ble_objs.items():
if LE_ADVERTISING_MANAGER_IFACE in interface:
le_adv_iface_path = path
if le_adv_iface_path is None:
print('\n Cannot start advertising. LEAdvertisingManager1 Interface not found')
return False
le_adv_obj = lib_gap.Advertisement(self.bus, adv_iface_index, adv_type, adv_uuid, adv_host_name)
le_adv_manager_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, le_adv_iface_path), LE_ADVERTISING_MANAGER_IFACE)
le_adv_manager_iface_obj.RegisterAdvertisement(le_adv_obj.get_path(), {},
reply_handler=self.adv_handler,
error_handler=self.adv_error_handler)
GLib.timeout_add_seconds(2, self.verify_blecent)
event_loop.run()
if TEST_CHECKS_PASS:
return True
else:
return False
except Exception as e:
print("in Exception")
print(e)
return False
def adv_handler(self):
'''
Advertisement Register success handler
'''
global ADV_REGISTERED
ADV_REGISTERED = True
def adv_error_handler(self, error):
'''
Advertisement Register error handler
'''
global ADV_REGISTERED
ADV_REGISTERED = False
def verify_blecent(self):
"""
Verify blecent test commands are successful
"""
global blecent_retry_check_cnt, gatt_app_obj_check, gatt_app_reg_check,\
adv_data_check, adv_reg_check, read_req_check, write_req_check,\
subscribe_req_check, TEST_CHECKS_PASS
# Get device when connected
if not self.device:
om_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, "/"), DBUS_OM_IFACE)
self.ble_objs = om_iface_obj.GetManagedObjects()
for path, interfaces in self.ble_objs.items():
if DEVICE_IFACE not in interfaces.keys():
continue
device_props_iface_obj = dbus.Interface(self.bus.get_object(BLUEZ_SERVICE_NAME, path), DBUS_PROP_IFACE)
device_props_iface_obj.connect_to_signal('PropertiesChanged', props_change_handler)
self.device = self.bus.get_object(BLUEZ_SERVICE_NAME, path)
# Check for failures after 10 retries
if blecent_retry_check_cnt == 10:
# check for failures
if not gatt_app_obj_check:
print("Failure: GATT Data could not be created")
if not gatt_app_reg_check:
print("Failure: GATT Application could not be registered")
if not adv_data_check:
print("Failure: Advertising data could not be created")
if not adv_reg_check:
print("Failure: Advertisement could not be registered")
if not read_req_check:
print("Failure: Read Request not received")
if not write_req_check:
print("Failure: Write Request not received")
if not subscribe_req_check:
print("Failure: Subscribe Request not received")
# Blecent Test failed
TEST_CHECKS_PASS = False
if subscribe_req_check:
lib_gatt.alert_status_char_obj.StopNotify()
event_loop.quit()
return False # polling for checks will stop
# Check for success
if not gatt_app_obj_check and lib_gatt.GATT_APP_OBJ:
print("GATT Data created")
gatt_app_obj_check = True
if not gatt_app_reg_check and GATT_APP_REGISTERED:
print("GATT Application registered")
gatt_app_reg_check = True
if not adv_data_check and lib_gap.ADV_OBJ:
print("Advertising data created")
adv_data_check = True
if not adv_reg_check and ADV_REGISTERED and ADV_ACTIVE_INSTANCE:
print("Advertisement registered")
adv_reg_check = True
if not read_req_check and lib_gatt.CHAR_READ:
read_req_check = True
if not write_req_check and lib_gatt.CHAR_WRITE:
write_req_check = True
if not subscribe_req_check and lib_gatt.CHAR_SUBSCRIBE:
subscribe_req_check = True
# Increment retry count
blecent_retry_check_cnt += 1
if read_req_check and write_req_check and subscribe_req_check:
# all checks passed
# Blecent Test passed
TEST_CHECKS_PASS = True
lib_gatt.alert_status_char_obj.StopNotify()
event_loop.quit()
return False # polling for checks will stop
# Default return True - polling for checks will continue
return True
def verify_blecent_disconnect(self):
"""
Verify cleanup is successful
"""
global blecent_retry_check_cnt, gatt_app_obj_check, gatt_app_reg_check,\
adv_data_check, adv_reg_check, ADV_STOP
if blecent_retry_check_cnt == 0:
gatt_app_obj_check = False
gatt_app_reg_check = False
adv_data_check = False
adv_reg_check = False
# Check for failures after 10 retries
if blecent_retry_check_cnt == 10:
# check for failures
if not gatt_app_obj_check:
print("Warning: GATT Data could not be removed")
if not gatt_app_reg_check:
print("Warning: GATT Application could not be unregistered")
if not adv_data_check:
print("Warning: Advertising data could not be removed")
if not adv_reg_check:
print("Warning: Advertisement could not be unregistered")
# Blecent Test failed
ADV_STOP = False
event_loop.quit()
return False # polling for checks will stop
# Check for success
if not gatt_app_obj_check and not lib_gatt.GATT_APP_OBJ:
print("GATT Data removed")
gatt_app_obj_check = True
if not gatt_app_reg_check and not GATT_APP_REGISTERED:
print("GATT Application unregistered")
gatt_app_reg_check = True
if not adv_data_check and not adv_reg_check and not (ADV_REGISTERED or ADV_ACTIVE_INSTANCE or lib_gap.ADV_OBJ):
print("Advertising data removed")
print("Advertisement unregistered")
adv_data_check = True
adv_reg_check = True
# Increment retry count
blecent_retry_check_cnt += 1
if adv_reg_check:
# all checks passed
ADV_STOP = True
event_loop.quit()
return False # polling for checks will stop
# Default return True - polling for checks will continue
return True
def disconnect(self):
'''
Before application exits:
Advertisement is unregistered
Advertisement object created is removed from dbus
GATT Application is unregistered
GATT Application object created is removed from dbus
Disconnect device if connected
Adapter is powered off
'''
try:
global blecent_retry_check_cnt, DISCOVERY_START
blecent_retry_check_cnt = 0
print("\nexiting from test...")
if ADV_REGISTERED:
# Unregister Advertisement
le_adv_manager_iface_obj.UnregisterAdvertisement(le_adv_obj.get_path())
# Remove Advertising data
dbus.service.Object.remove_from_connection(le_adv_obj)
if GATT_APP_REGISTERED:
# Unregister GATT Application
gatt_manager_iface_obj.UnregisterApplication(gatt_app_obj.get_path())
# Remove GATT data
dbus.service.Object.remove_from_connection(gatt_app_obj)
GLib.timeout_add_seconds(2, self.verify_blecent_disconnect)
event_loop.run()
if ADV_STOP:
print("Stop Advertising status: ", ADV_STOP)
else:
print("Warning: Stop Advertising status: ", ADV_STOP)
# Disconnect device
if self.device:
print("disconnecting device...")
self.device.Disconnect(dbus_interface=DEVICE_IFACE)
if self.adapter:
self.adapter.RemoveDevice(self.device)
self.device = None
if DISCOVERY_START:
self.adapter.StopDiscovery()
DISCOVERY_START = False
# Power off Adapter
self.props_iface_obj.Set(ADAPTER_IFACE, "Powered", dbus.Boolean(0))
event_loop.run()
if not DEVICE_CONNECTED:
print("device disconnected")
else:
print("Warning: device could not be disconnected")
print("powering off adapter...")
if not ADAPTER_ON:
print("bluetooth adapter powered off")
else:
print("\nWarning: Bluetooth adapter not powered off")
except Exception as e:
print(e)
return False
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