def handle_event_response(self):
"""
This reads the enciphered response from an accessory after registering for events.
:return: the event data as string (not as json object)
"""
try:
return self._read_response(1)
except OSError as e:
raise exceptions.AccessoryDisconnectedError(str(e))
def _handle_request(self, data):
with self.lock:
data = data.replace("\n", "\r\n")
assert len(data) < 1024
len_bytes = len(data).to_bytes(2, byteorder='little')
cnt_bytes = self.c2a_counter.to_bytes(8, byteorder='little')
self.c2a_counter += 1
ciper_and_mac = chacha20_aead_encrypt(len_bytes, self.c2a_key, cnt_bytes, bytes([0, 0, 0, 0]),
data.encode())
try:
self.sock.send(len_bytes + ciper_and_mac[0] + ciper_and_mac[1])
return self._read_response(self.timeout)
except OSError as e:
raise exceptions.AccessoryDisconnectedError(str(e))
def _handle_request(self, data):
logging.debug('handle request: %s', data)
with self.lock:
while len(data) > 0:
# split the data to max 1024 bytes (see page 71)
len_data = min(len(data), 1024)
tmp_data = data[:len_data]
data = data[len_data:]
len_bytes = len_data.to_bytes(2, byteorder='little')
cnt_bytes = self.c2a_counter.to_bytes(8, byteorder='little')
self.c2a_counter += 1
ciper_and_mac = chacha20_aead_encrypt(len_bytes, self.c2a_key,
cnt_bytes,
bytes([0, 0, 0,
0]), tmp_data)
try:
self.sock.send(len_bytes + ciper_and_mac[0] +
ciper_and_mac[1])
except OSError as e:
raise exceptions.AccessoryDisconnectedError(str(e))
return self._read_response(self.timeout)
