class PolarClient:
def __init__(self, path, name):
# Configuration.
parser = argparse.ArgumentParser()
parser.add_argument("-i",
"--inifile",
default=os.path.join(path, name + '.ini'),
help="name of the configuration file")
args = parser.parse_args()
config = configparser.ConfigParser(inline_comment_prefixes=('#', ';'))
config.read(args.inifile)
# Redis.
try:
rds = redis.StrictRedis(host=config.get('redis', 'hostname'),
port=config.getint('redis', 'port'),
db=0,
charset='utf-8',
decode_responses=True)
except redis.ConnectionError as e:
raise RuntimeError(e)
# Combine the patching from the configuration file and Redis.
self.patch = EEGsynth.patch(config, rds)
# BLE client.
self.loop = asyncio.get_event_loop()
self.ble_client = BleakClient(self.patch.getstring("input", "mac"),
loop=self.loop)
self.monitor = EEGsynth.monitor(name=name,
debug=self.patch.getint(
"general", "debug"))
async def connect(self):
self.monitor.info("Trying to connect to Polar belt {0}".format(
self.patch.getstring("input", "mac")))
await self.ble_client.connect()
await self.ble_client.start_notify(
self.patch.getstring("input", "hr_uuid"), self.data_handler)
self.monitor.success("Connected to Polar belt {0}".format(
self.patch.getstring("input", "mac")))
def start(self):
asyncio.ensure_future(self.connect())
self.loop.run_forever()
def stop(self):
asyncio.ensure_future(
self.ble_client.stop_notify(
self.patch.getstring("input", "hr_uuid")))
asyncio.ensure_future(self.ble_client.disconnect())
self.monitor.success("Disconnected from Polar belt {0}".format(
self.patch.getstring("input", "mac")))
sys.exit()
def data_handler(self, sender,
data): # sender (UUID) unused but required by Bleak API
"""
data has up to 6 bytes:
byte 1: flags
00 = only HR
16 = HR and IBI(s)
byte 2: HR
byte 3 and 4: IBI1
byte 5 and 6: IBI2 (if present)
byte 7 and 8: IBI3 (if present)
etc.
Polar H10 Heart Rate Characteristics
(UUID: 00002a37-0000-1000-8000-00805f9b34fb):
+ Energy expenditure is not transmitted
+ HR only transmitted as uint8, no need to check if HR is
transmitted as uint8 or uint16 (necessary for bpm > 255)
Acceleration and raw ECG only available via Polar SDK
"""
bytes = list(data)
hr = None
ibis = []
if bytes[0] == 00:
hr = data[1]
if bytes[0] == 16:
hr = data[1]
for i in range(2, len(bytes), 2):
ibis.append(data[i] + 256 * data[i + 1])
if ibis:
for ibi in ibis:
self.patch.setvalue(self.patch.getstring("output", "key_ibi"),
ibi)
if hr:
self.patch.setvalue(self.patch.getstring("output", "key_hr"), hr)
print("Received HR={0}, IBI(s)={1}".format(hr, ibis))
