class BluezBleInterface(BleInterface):
def __init__(self, *args, **kwargs):
super(BluezBleInterface, self).__init__(*args, **kwargs)
self._addr = kwargs.get('addr')
self._log.info("Started interface {0}.".format(self))
def __del__(self):
self._disconnect()
def _connect(self, addr):
self._log.info("BLE %s connecting ..." % addr)
self.requester = GATTRequester(addr, False)
self.requester.connect(True)
chars = self.requester.discover_characteristics()
self.characteristic = {}
for char in chars:
self.characteristic[char['uuid']] = char['value_handle']
self._log.info("BLE %s connected OK" % self._addr)
def _disconnect(self):
self.requester.disconnect()
def _read_uuid(self, reg, type='float'):
value = self.requester.read_by_uuid(reg)[0]
if type == 'float':
return struct.unpack('H', value)[0] * 1.0
elif type == 'string':
try:
value = value.decode("utf-8")
except AttributeError:
pass
return value
else:
return value
def _write_uuid(self, reg, value, type='float'):
if type == 'string':
value = struct.pack('B', value)
self.requester.write_by_handle(self.characteristic[reg], value)
import time
from bluetooth.ble import GATTRequester
#
# the MAC address of the BLE device. Replace 'D8:80:39:FC:7B:F5' with the address of your device.
#
grq = GATTRequester('D8:80:39:FC:7B:F5', False)
grq.connect()
print("Waiting to connect...")
while not grq.is_connected():
time.sleep(1)
print("Connected.")
characteristics = grq.discover_characteristics()
#
# the UUID of the service on the BLE device.
#
sample_uuid = '59c889e0-5364-11e7-b114-b2f933d5fe66'
# find the handle for the characteristic.
vh_sample = None
for c12c in characteristics:
if c12c['uuid'] == sample_uuid:
vh_sample = c12c['value_handle']
print("Characteristic value handle is %d." % vh_sample)
break
assert (vh_sample is not None)
