def notify(
self, data
) -> EventWaitable[GattsCharacteristic, NotificationCompleteEventArgs]:
"""
Notifies the client with the data provided without setting the data into the characteristic value.
If data is not provided (None), will notify with the currently-set value of the characteristic
:param data: The data to notify the client with
:return: An EventWaitable that will fire when the notification is successfully sent to the client. The waitable
also contains the ID of the sent notification which is used in the on_notify_complete event
:rtype: NotificationCompleteEventWaitable
"""
if isinstance(data, BleDataStream):
value = data.value
if isinstance(data, str):
value = data.encode(self.string_encoding)
if not self.notifiable:
raise InvalidOperationException(
"Cannot notify client. "
"{} not set up for notifications or indications".format(
self.uuid))
if not self.client_subscribed:
raise InvalidStateException(
"Client is not subscribed, cannot notify client")
notification_id = self._notification_manager.notify(
self, self.value_handle, self._on_notify_complete, data)
return IdBasedEventWaitable(self._on_notify_complete, notification_id)
def notify(
self, data
) -> IdBasedEventWaitable[GattsCharacteristic,
NotificationCompleteEventArgs]:
"""
Notifies the client with the data provided without setting the data into the characteristic value.
If data is not provided (None), will notify with the currently-set value of the characteristic
:param data: Optional data to notify the client with. If supplied, must be an iterable type such as a
str, bytes, or list of uint8 values, or a BleDataStream object.
Length must be less than or equal to the characteristic's max length.
If a string is given, it will be encoded using the string_encoding property of the characteristic.
:raises: InvalidStateException if the client is not subscribed to the characteristic
:raises: InvalidOperationException if the characteristic is not configured for notifications/indications
:return: An EventWaitable that will trigger when the notification is successfully sent to the client. The waitable
also contains the ID of the sent notification which is used in the on_notify_complete event
"""
if isinstance(data, BleDataStream):
value = data.value
if isinstance(data, str):
value = data.encode(self.string_encoding)
if not self.notifiable:
raise InvalidOperationException(
"Cannot notify client. "
"{} not set up for notifications or indications".format(
self.uuid))
if not self.client_subscribed:
raise InvalidStateException(
"Client is not subscribed, cannot notify client")
notification_id = self._notification_manager.notify(
self, self._value_attr.handle, self._on_notify_complete, data)
return IdBasedEventWaitable(self._on_notify_complete, notification_id)
def type(self):
if self.char.cccd_state == gatt.SubscriptionState.INDICATION:
return nrf_types.BLEGattHVXType.indication
elif self.char.cccd_state == gatt.SubscriptionState.NOTIFY:
return nrf_types.BLEGattHVXType.notification
else:
raise InvalidStateException("Client not subscribed")
def pair(self, force_repairing=False):
"""
Starts the encrypting process with the peer. If the peer has already been bonded to,
Starts the pairing process with the peer given the set security parameters
and returns a Waitable which will fire when the pairing process completes, whether successful or not.
Waitable returns two parameters: (Peer, PairingCompleteEventArgs)
:return: A waitiable that will fire when pairing is complete
:rtype: blatann.waitables.EventWaitable
"""
if self._pairing_in_process or self._initiated_encryption:
raise InvalidStateException("Security manager busy")
if self.security_params.reject_pairing_requests:
raise InvalidOperationException(
"Cannot initiate pairing while rejecting pairing requests")
# if in the client role and don't want to force a re-pair, check for bonding data first
if self.peer.is_peripheral and not force_repairing:
bond_entry = self._find_db_entry(self.peer.peer_address)
if bond_entry:
logger.info("Re-establishing encryption with peer using LTKs")
self.ble_device.ble_driver.ble_gap_encrypt(
self.peer.conn_handle,
bond_entry.bonding_data.own_ltk.master_id,
bond_entry.bonding_data.own_ltk.enc_info)
self._initiated_encryption = True
sec_params = self._get_security_params()
self.ble_device.ble_driver.ble_gap_authenticate(
self.peer.conn_handle, sec_params)
self._pairing_in_process = True
return EventWaitable(self.on_pairing_complete)
def write(self, handle, data):
"""
Writes data to the attribute at the handle provided. Can only write to a single attribute at a time.
If a write is in progress, raises an InvalidStateException
:param handle: The attribute handle to write
:param data: The data to write
:return: A Waitable that will fire when the write finishes. see on_write_complete for the values returned from the waitable
:rtype: EventWaitable
"""
if self._busy:
raise InvalidStateException("Gattc Writer is busy")
if len(data) == 0:
raise ValueError("Data must be at least one byte")
self._offset = 0
self._handle = handle
self._data = data
logger.debug("Starting write to handle {}, len: {}".format(self._handle, len(self._data)))
try:
self._busy = True
self._write_next_chunk()
except Exception:
self._busy = False
raise
return EventWaitable(self.on_write_complete)
def notify(self, characteristic, handle, event_on_complete, data=None):
if characteristic.cccd_state == gatt.SubscriptionState.INDICATION:
manager = self._indication_manager
elif characteristic.cccd_state == gatt.SubscriptionState.NOTIFY:
manager = self._notification_manager
else:
raise InvalidStateException("Client not subscribed")
return manager.notify(characteristic, handle, event_on_complete, data)
def __init__(self, connected_peer):
"""
:type ble_device: blatann.device.BleDevice
:type connected_peer: blatann.peer.Peer
"""
super(DisconnectionWaitable, self).__init__(n_args=2)
if not connected_peer:
raise InvalidStateException("Peer already disconnected")
connected_peer.on_disconnect.register(self._on_disconnect)
def read(self, handle):
"""
Reads the attribute value from the handle provided. Can only read from a single attribute at a time. If a
read is in progress, raises an InvalidStateException
:param handle: the attribute handle to read
:return: A waitable that will fire when the read finishes.
See on_read_complete for the values returned from the waitable
:rtype: EventWaitable
"""
if self._busy:
raise InvalidStateException("Gattc Reader is busy")
self._handle = handle
self._offset = 0
self._data = bytearray()
logger.debug("Starting read from handle {}".format(handle))
self._read_next_chunk()
self._busy = True
return EventWaitable(self.on_read_complete)
def pair(self):
"""
Starts the pairing process with the peer given the set security parameters
and returns a Waitable which will fire when the pairing process completes, whether successful or not.
Waitable returns two parameters: (Peer, PairingCompleteEventArgs)
:return: A waitiable that will fire when pairing is complete
:rtype: blatann.waitables.EventWaitable
"""
if self._busy:
raise InvalidStateException("Security manager busy")
if self.security_params.reject_pairing_requests:
raise InvalidOperationException(
"Cannot initiate pairing while rejecting pairing requests")
sec_params = self._get_security_params()
self.ble_device.ble_driver.ble_gap_authenticate(
self.peer.conn_handle, sec_params)
self._busy = True
return EventWaitable(self.on_pairing_complete)
