mirror of
https://github.com/CovidBraceletPrj/CovidBracelet.git
synced 2024-11-11 14:08:52 +01:00
181 lines
7.6 KiB
Python
181 lines
7.6 KiB
Python
#
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# Copyright (c) 2020 Olaf Landsiedel, based on a code example from Tony DiCola
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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#NOTE: seems not to work well on some iMACs
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import logging
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import time
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import uuid
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import struct
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import binascii
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import Adafruit_BluefruitLE
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# Enable debug output.
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#logging.basicConfig(level=logging.DEBUG)
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# Define service and characteristic UUIDs used by the Covid service.
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COVID_SERVICE_UUID = uuid.UUID('F2110D79-699F-6A98-EA42-A7AD9EC75106')
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NEXT_KEY_UUID = uuid.UUID('F3110D79-699F-6A98-EA42-A7AD9EC75106')
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NEW_KEY_UUID = uuid.UUID('F4110D79-699F-6A98-EA42-A7AD9EC75106')
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INFECTED_KEY_CNT_UUID = uuid.UUID('F5110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_0_UUID = uuid.UUID('00110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_1_UUID = uuid.UUID('01110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_2_UUID = uuid.UUID('02110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_3_UUID = uuid.UUID('03110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_4_UUID = uuid.UUID('04110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_5_UUID = uuid.UUID('05110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_6_UUID = uuid.UUID('06110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_7_UUID = uuid.UUID('07110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_8_UUID = uuid.UUID('08110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_9_UUID = uuid.UUID('09110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_10_UUID = uuid.UUID('0A110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_11_UUID = uuid.UUID('0B110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_12_UUID = uuid.UUID('0C110D79-699F-6A98-EA42-A7AD9EC75106')
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PERIOD_KEY_13_UUID = uuid.UUID('0D110D79-699F-6A98-EA42-A7AD9EC75106')
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infected_period_keys = []
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# Get the BLE provider for the current platform.
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ble = Adafruit_BluefruitLE.get_provider()
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def check_infection(covid):
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infected_key_cnt_reader = covid.find_characteristic(INFECTED_KEY_CNT_UUID)
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period_key_readers = (
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covid.find_characteristic(PERIOD_KEY_0_UUID),
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covid.find_characteristic(PERIOD_KEY_1_UUID),
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covid.find_characteristic(PERIOD_KEY_2_UUID),
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covid.find_characteristic(PERIOD_KEY_3_UUID),
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covid.find_characteristic(PERIOD_KEY_4_UUID),
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covid.find_characteristic(PERIOD_KEY_5_UUID),
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covid.find_characteristic(PERIOD_KEY_6_UUID),
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covid.find_characteristic(PERIOD_KEY_7_UUID),
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covid.find_characteristic(PERIOD_KEY_8_UUID),
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covid.find_characteristic(PERIOD_KEY_9_UUID),
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covid.find_characteristic(PERIOD_KEY_10_UUID),
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covid.find_characteristic(PERIOD_KEY_11_UUID),
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covid.find_characteristic(PERIOD_KEY_12_UUID),
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covid.find_characteristic(PERIOD_KEY_13_UUID)
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)
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#check for infection
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ret = bytearray(infected_key_cnt_reader.read_value())
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infected_key_cnt = int.from_bytes(ret, byteorder='little', signed=False)
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print('device has: infected key cnt ', infected_key_cnt)
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for i in range(infected_key_cnt):
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ret = bytearray(period_key_readers[i].read_value())
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if ret not in infected_period_keys:
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print('adding to DB new infected key ', i, ': ', binascii.hexlify(bytearray(ret)))
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infected_period_keys.append(ret)
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else:
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print('infected key ', i , 'already known in DB: ', binascii.hexlify(bytearray(ret)))
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def upload_keys(covid):
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next_key = covid.find_characteristic(NEXT_KEY_UUID)
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new_key = covid.find_characteristic(NEW_KEY_UUID)
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go_on = True
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while go_on:
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print("read key")
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ret = bytearray(next_key.read_value())
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expected_index = int.from_bytes(ret, byteorder='little', signed=False)
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print('expected key index of device is ', expected_index, ', we have upto id ', len(infected_period_keys))
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#TODO: check for maximum storage on device
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if( expected_index >= 0 and expected_index < len(infected_period_keys) ):
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print('Sending key ', expected_index, ' from DB to device...')
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new_key.write_value(infected_period_keys[expected_index])
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#TODO do we need this?
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time.sleep(1)
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else:
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go_on = False
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# Main function implements the program logic so it can run in a background
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# thread. Most platforms require the main thread to handle GUI events and other
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# asyncronous events like BLE actions. All of the threading logic is taken care
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# of automatically though and you just need to provide a main function that uses
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# the BLE provider.
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def main():
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# Clear any cached data because both bluez and CoreBluetooth have issues with
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# caching data and it going stale.
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ble.clear_cached_data()
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# Get the first available BLE network adapter and make sure it's powered on.
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adapter = ble.get_default_adapter()
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adapter.power_on()
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print('Using adapter: {0}'.format(adapter.name))
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# Disconnect any currently connected UART devices. Good for cleaning up and
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# starting from a fresh state.
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print('Disconnecting any connected Covid devices...')
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ble.disconnect_devices([COVID_SERVICE_UUID])
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while True:
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# Scan for Covid devices.
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print('Searching for Covid device...')
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try:
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adapter.start_scan()
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# Search for the first Covid device found (will time out after 60 seconds
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# but you can specify an optional timeout_sec parameter to change it).
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device = ble.find_device(service_uuids=[COVID_SERVICE_UUID])
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if device is None:
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raise RuntimeError('Failed to find Covid device!')
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finally:
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# Make sure scanning is stopped before exiting.
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adapter.stop_scan()
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if device is not None:
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print('Connecting to device...')
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device.connect() # Will time out after 60 seconds, specify timeout_sec parameter
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# to change the timeout.
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# Once connected do everything else in a try/finally to make sure the device
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# is disconnected when done.
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try:
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# Wait for service discovery to complete for at least the specified
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# service and characteristic UUID lists. Will time out after 60 seconds
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# (specify timeout_sec parameter to override).
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print('Discovering services...')
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device.discover([COVID_SERVICE_UUID], [NEXT_KEY_UUID, NEW_KEY_UUID,
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INFECTED_KEY_CNT_UUID,
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PERIOD_KEY_0_UUID,
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PERIOD_KEY_1_UUID,
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PERIOD_KEY_2_UUID,
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PERIOD_KEY_3_UUID,
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PERIOD_KEY_4_UUID,
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PERIOD_KEY_5_UUID,
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PERIOD_KEY_6_UUID,
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PERIOD_KEY_7_UUID,
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PERIOD_KEY_8_UUID,
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PERIOD_KEY_9_UUID,
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PERIOD_KEY_10_UUID,
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PERIOD_KEY_11_UUID,
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PERIOD_KEY_12_UUID,
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PERIOD_KEY_13_UUID
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])
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# Find the Covid service and its characteristics.
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covid = device.find_service(COVID_SERVICE_UUID)
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check_infection(covid)
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upload_keys(covid)
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finally:
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# Make sure device is disconnected on exit.
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device.disconnect()
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# Initialize the BLE system. MUST be called before other BLE calls!
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ble.initialize()
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# Start the mainloop to process BLE events, and run the provided function in
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# a background thread. When the provided main function stops running, returns
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# an integer status code, or throws an error the program will exit.
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ble.run_mainloop_with(main) |