class MerossCloudClient(object):
_DEFAULT_PORT = 2001
def __init__(
self,
cloud_credentials, # type: MerossCloudCreds
push_message_callback=None, # type: callable
auto_reconnect=True, # type: bool
**kwords):
self.connection_status = ConnectionStatusManager()
self._cloud_creds = cloud_credentials
self._auto_reconnect = auto_reconnect
self._pending_response_messages = dict()
self._pending_responses_lock = lock_factory.build_rlock()
self._push_message_callback = push_message_callback
self._subscription_count = AtomicCounter(0)
if "domain" in kwords:
self._domain = kwords['domain']
else:
self._domain = "iot.meross.com"
# Lookup port and certificate for MQTT server
self._port = kwords.get('port', MerossCloudClient._DEFAULT_PORT)
self._ca_cert = kwords.get('ca_cert', None)
self._generate_client_and_app_id()
# Password is calculated as the MD5 of USERID concatenated with KEY
md5_hash = md5()
clearpwd = "%s%s" % (self._cloud_creds.user_id, self._cloud_creds.key)
md5_hash.update(clearpwd.encode("utf8"))
hashed_password = md5_hash.hexdigest()
# Start the mqtt client
self._mqtt_client = mqtt.Client(
client_id=self._client_id, protocol=mqtt.MQTTv311
) # ex. app-id -> app:08d4c9f99da40203ebc798a76512ec14
self._mqtt_client.on_connect = self._on_connect
self._mqtt_client.on_message = self._on_message
self._mqtt_client.on_disconnect = self._on_disconnect
self._mqtt_client.on_subscribe = self._on_subscribe
# Avoid login if user_id is None
if self._cloud_creds.user_id is not None:
self._mqtt_client.username_pw_set(
username=self._cloud_creds.user_id, password=hashed_password)
self._mqtt_client.tls_set(ca_certs=self._ca_cert,
certfile=None,
keyfile=None,
cert_reqs=ssl.CERT_REQUIRED,
tls_version=ssl.PROTOCOL_TLS,
ciphers=None)
def close(self):
l.info("Closing the MQTT connection...")
self._mqtt_client.disconnect()
l.debug("Waiting for the client to disconnect...")
self.connection_status.wait_for_status(ClientStatus.CONNECTION_DROPPED)
# Starts a new thread that handles mqtt protocol and calls us back via callbacks
l.debug("Stopping the MQTT looper.")
self._mqtt_client.loop_stop(True)
l.info("Client has been fully disconnected.")
def connect(self):
"""
Starts the connection to the MQTT broker
:return:
"""
l.info("Initializing the MQTT connection...")
self._mqtt_client.connect(self._domain, self._port, keepalive=30)
self.connection_status.update_status(ClientStatus.CONNECTING)
# Starts a new thread that handles mqtt protocol and calls us back via callbacks
l.debug("(Re)Starting the MQTT looper.")
self._mqtt_client.loop_stop(True)
self._mqtt_client.loop_start()
l.debug("Waiting for the client to connect...")
self.connection_status.wait_for_status(ClientStatus.SUBSCRIBED)
l.info(
"Client connected to MQTT broker and subscribed to relevant topics."
)
# ------------------------------------------------------------------------------------------------
# MQTT Handlers
# ------------------------------------------------------------------------------------------------
def _on_disconnect(self, client, userdata, rc):
l.info("Disconnection detected. Reason: %s" % str(rc))
# When the mqtt connection is dropped, we need to reset the subscription counter.
self._subscription_count = AtomicCounter(0)
self.connection_status.update_status(ClientStatus.CONNECTION_DROPPED)
# If the client disconnected explicitly, the mqtt library handles thred stop autonomously
if rc == mqtt.MQTT_ERR_SUCCESS:
pass
else:
# Otherwise, if the disconnection was not intentional, we probably had a connection drop.
# In this case, we only stop the loop thread if auto_reconnect is not set. In fact, the loop will
# handle reconnection autonomously on connection drops.
if not self._auto_reconnect:
l.info("Stopping mqtt loop on connection drop")
client.loop_stop(True)
else:
l.warning(
"Client has been disconnected, however auto_reconnect flag is set. "
"Won't stop the looping thread, as it will retry to connect."
)
def _on_unsubscribe(self):
l.debug("Unsubscribed from topic")
self._subscription_count.dec()
def _on_subscribe(self, client, userdata, mid, granted_qos):
l.debug("Succesfully subscribed to topic. Subscription count: %d" %
self._subscription_count.get())
if self._subscription_count.inc() == 2:
self.connection_status.update_status(ClientStatus.SUBSCRIBED)
def _on_connect(self, client, userdata, rc, other):
l.debug("Connected with result code %s" % str(rc))
self.connection_status.update_status(ClientStatus.CONNECTED)
self._client_response_topic = "/app/%s-%s/subscribe" % (
self._cloud_creds.user_id, self._app_id)
self._user_topic = "/app/%s/subscribe" % self._cloud_creds.user_id
# Subscribe to the relevant topics
l.debug("Subscribing to topics...")
client.subscribe(self._user_topic)
client.subscribe(self._client_response_topic)
def _on_message(self, client, userdata, msg):
"""
This handler is called when a message is received from the MQTT broker, on the subscribed topics.
The current implementation checks the validity of the message itself, by verifying its signature.
:param client: is the MQTT client reference, useful to respond back
:param userdata: metadata about the received data
:param msg: message that was received
:return: nothing, it simply handles the message accordingly.
"""
networkl.debug(msg.topic + " --> " + str(msg.payload))
try:
message = json.loads(str(msg.payload, "utf8"))
header = message['header']
message_hash = md5()
strtohash = "%s%s%s" % (header['messageId'], self._cloud_creds.key,
header['timestamp'])
message_hash.update(strtohash.encode("utf8"))
expected_signature = message_hash.hexdigest().lower()
if header['sign'] != expected_signature:
raise InvalidSignatureException(
'The signature did not match!',
expected_signature=expected_signature,
provided_signature=header['sign'],
data=message)
# Check if there is any thread waiting for this message or if there is a callback that we need to invoke.
# If so, do it here.
handle = None
with self._pending_responses_lock:
msg_id = header['messageId']
handle = self._pending_response_messages.get(msg_id)
from_myself = False
if handle is not None:
# There was a handle for this message-id. It means it is a response message to some
# request performed by the library itself.
from_myself = True
try:
l.debug("Calling handle event handler for message %s" %
msg_id)
# Call the handler
handle.notify_message_received(error=None,
response=message)
l.debug("Done handler for message %s" % msg_id)
# Remove the message from the pending queue
with self._pending_responses_lock:
del self._pending_response_messages[msg_id]
except:
l.exception(
"Error occurred while invoking message handler")
# Let's also catch all the "PUSH" notifications and dispatch them to the push_notification_callback.
if self._push_message_callback is not None and header[
'method'] == "PUSH" and 'namespace' in header:
self._push_message_callback(message, from_myself=from_myself)
except InvalidSignatureException as e:
l.error(
"Invalid signature received. Expecting: %s, received %s. Message: %s"
% (e.expected_signature, e.provided_signature,
json.dumps(e.data)))
except Exception:
l.exception("Failed to process message.")
# ------------------------------------------------------------------------------------------------
# Protocol Handlers
# ------------------------------------------------------------------------------------------------
def execute_cmd(self,
dst_dev_uuid,
method,
namespace,
payload,
callback=None,
timeout=SHORT_TIMEOUT):
# If the underlying mqttclient is not connected, let's fast-fail.
# Otherwise, if it's connected but not yet subscribed to relevant topics, it's still OK to
# queue messages: the client will dispatch them as soon it subscribes to the relevant topics.
if not self._mqtt_client.is_connected():
l.error("The underlying mqtt client is not connected.")
raise ConnectionError()
start = time.time()
# Build the mqtt message we will send to the broker
message, message_id = self._build_mqtt_message(method, namespace,
payload)
# Register the waiting handler for that message
handle = PendingMessageResponse(message_id=message_id,
callback=callback)
with self._pending_responses_lock:
self._pending_response_messages[message_id] = handle
# Send the message to the broker
l.debug("Executing message-id %s, %s on %s command for device %s" %
(message_id, method, namespace, dst_dev_uuid))
self._mqtt_client.publish(
topic=build_client_request_topic(dst_dev_uuid), payload=message)
# If the caller has specified a callback, we don't need to actively wait for the message ACK. So we can
# immediately return.
if callback is not None:
return None
# Otherwise, we need to wait until the message is received.
l.debug("Waiting for response to message-id %s" % message_id)
success, resp = handle.wait_for_response(timeout=timeout)
if not success:
raise CommandTimeoutException(
"A timeout occurred while waiting for the ACK: %d" % timeout)
elapsed = time.time() - start
l.debug("Message-id: %s, command %s-%s command for device %s took %s" %
(message_id, method, namespace, dst_dev_uuid, str(elapsed)))
return resp['payload']
# ------------------------------------------------------------------------------------------------
# Protocol utilities
# ------------------------------------------------------------------------------------------------
def _build_mqtt_message(self, method, namespace, payload):
"""
Sends a message to the Meross MQTT broker, respecting the protocol payload.
:param method:
:param namespace:
:param payload:
:return:
"""
# Generate a random 16 byte string
randomstring = ''.join(
random.SystemRandom().choice(string.ascii_uppercase +
string.digits) for _ in range(16))
# Hash it as md5
md5_hash = md5()
md5_hash.update(randomstring.encode('utf8'))
messageId = md5_hash.hexdigest().lower()
timestamp = int(round(time.time()))
# Hash the messageId, the key and the timestamp
md5_hash = md5()
strtohash = "%s%s%s" % (messageId, self._cloud_creds.key, timestamp)
md5_hash.update(strtohash.encode("utf8"))
signature = md5_hash.hexdigest().lower()
data = {
"header": {
"from": self._client_response_topic,
"messageId":
messageId, # Example: "122e3e47835fefcd8aaf22d13ce21859"
"method": method, # Example: "GET",
"namespace": namespace, # Example: "Appliance.System.All",
"payloadVersion": 1,
"sign":
signature, # Example: "b4236ac6fb399e70c3d61e98fcb68b74",
"timestamp": timestamp,
"triggerSrc": "Android"
},
"payload": payload
}
strdata = json.dumps(data)
return strdata.encode("utf-8"), messageId
def _generate_client_and_app_id(self):
md5_hash = md5()
rnd_uuid = UUID.uuid4()
md5_hash.update(("%s%s" % ("API", rnd_uuid)).encode("utf8"))
self._app_id = md5_hash.hexdigest()
self._client_id = 'app:%s' % md5_hash.hexdigest()
class GenericPlug:
_status_lock = None
_client_status = None
_token = None
_key = None
_user_id = None
_domain = None
_port = 2001
_channels = []
_uuid = None
_client_id = None
_app_id = None
# Device info
_name = None
_type = None
_hwversion = None
_fwversion = None
# Topic name where the client should publish to its commands. Every client should have a dedicated one.
_client_request_topic = None
# Topic name in which the client retrieves its own responses from server.
_client_response_topic = None
# Topic where important notifications are pushed (needed if any other client is dealing with the same device)
_user_topic = None
# Paho mqtt client object
_mqtt_client = None
# Waiting condition used to wait for command ACKs
_waiting_message_ack_queue = None
_waiting_subscribers_queue = None
_waiting_message_id = None
_ack_response = None
# Block for at most 10 seconds.
_command_timeout = 10
_error = None
# Cached list of abilities
_abilities = None
# Dictionary {channel->status}
_state = None
def __init__(self, token, key, user_id, **kwords):
self._status_lock = RLock()
self._waiting_message_ack_queue = Condition()
self._waiting_subscribers_queue = Condition()
self._subscription_count = AtomicCounter(0)
self._set_status(ClientStatus.INITIALIZED)
self._token = token,
self._key = key
self._user_id = user_id
self._uuid = kwords['uuid']
if "domain" in kwords:
self._domain = kwords['domain']
else:
self._domain = "eu-iot.meross.com"
if "channels" in kwords:
self._channels = kwords['channels']
# Informations about device
if "devName" in kwords:
self._name = kwords['devName']
if "deviceType" in kwords:
self._type = kwords['deviceType']
if "fmwareVersion" in kwords:
self._fwversion = kwords['fmwareVersion']
if "hdwareVersion" in kwords:
self._hwversion = kwords['hdwareVersion']
# Lookup port and certificate for MQTT server
self._port = kwords.get('port', GenericPlug._port)
self._ca_cert = kwords.get('ca_cert', None)
self._generate_client_and_app_id()
# Password is calculated as the MD5 of USERID concatenated with KEY
md5_hash = md5()
clearpwd = "%s%s" % (self._user_id, self._key)
md5_hash.update(clearpwd.encode("utf8"))
hashed_password = md5_hash.hexdigest()
# Start the mqtt client
self._mqtt_client = mqtt.Client(
client_id=self._client_id, protocol=mqtt.MQTTv311
) # ex. app-id -> app:08d4c9f99da40203ebc798a76512ec14
self._mqtt_client.on_connect = self._on_connect
self._mqtt_client.on_message = self._on_message
self._mqtt_client.on_disconnect = self._on_disconnect
self._mqtt_client.on_subscribe = self._on_subscribe
self._mqtt_client.on_log = self._on_log
# Avoid login if user_id is None
if self._user_id is not None:
self._mqtt_client.username_pw_set(username=self._user_id,
password=hashed_password)
self._mqtt_client.tls_set(ca_certs=self._ca_cert,
certfile=None,
keyfile=None,
cert_reqs=ssl.CERT_REQUIRED,
tls_version=ssl.PROTOCOL_TLS,
ciphers=None)
self._mqtt_client.connect(self._domain, self._port, keepalive=30)
self._set_status(ClientStatus.CONNECTING)
# Starts a new thread that handles mqtt protocol and calls us back via callbacks
self._mqtt_client.loop_start()
with self._waiting_subscribers_queue:
self._waiting_subscribers_queue.wait()
if self._client_status != ClientStatus.SUBSCRIBED:
# An error has occurred
raise Exception(self._error)
self.get_status()
# Private methods used by the base class in order to handle basic protocol communication
# --------------------------------------------------------------------------------------
def _on_disconnect(self, client, userdata, rc):
l.info("Disconnection detected. Reason: %s" % str(rc))
# We should clean all the data structures.
with self._status_lock:
self._subscription_count = AtomicCounter(0)
self._error = "Connection dropped by the server"
self._set_status(ClientStatus.CONNECTION_DROPPED)
with self._waiting_subscribers_queue:
self._waiting_subscribers_queue.notify_all()
with self._waiting_message_ack_queue:
self._waiting_message_ack_queue.notify_all()
if rc == mqtt.MQTT_ERR_SUCCESS:
pass
else:
# TODO: Should we reconnect by calling again the client.loop_start() ?
client.loop_stop()
def _on_unsubscribe(self):
l.debug("Unsubscribed from topic")
self._subscription_count.dec()
def _on_subscribe(self, client, userdata, mid, granted_qos):
l.debug("Succesfully subscribed!")
if self._subscription_count.inc() == 2:
with self._waiting_subscribers_queue:
self._set_status(ClientStatus.SUBSCRIBED)
self._waiting_subscribers_queue.notify_all()
def _on_connect(self, client, userdata, rc, other):
l.debug("Connected with result code %s" % str(rc))
self._set_status(ClientStatus.SUBSCRIBED)
self._set_status(ClientStatus.CONNECTED)
self._client_request_topic = "/appliance/%s/subscribe" % self._uuid
self._client_response_topic = "/app/%s-%s/subscribe" % (self._user_id,
self._app_id)
self._user_topic = "/app/%s/subscribe" % self._user_id
# Subscribe to the relevant topics
l.debug("Subscribing to topics...")
client.subscribe(self._user_topic)
client.subscribe(self._client_response_topic)
# The callback for when a PUBLISH message is received from the server.
# --------------------------------------------------------------------
def _on_message(self, client, userdata, msg):
l.debug(msg.topic + " --> " + str(msg.payload))
try:
message = json.loads(str(msg.payload, "utf8"))
header = message['header']
message_hash = md5()
strtohash = "%s%s%s" % (header['messageId'], self._key,
header['timestamp'])
message_hash.update(strtohash.encode("utf8"))
expected_signature = message_hash.hexdigest().lower()
if (header['sign'] != expected_signature):
raise MQTTException('The signature did not match!')
# If the message is the RESP for some previous action, process return the control to the "stopped" method.
if header['messageId'] == self._waiting_message_id:
with self._waiting_message_ack_queue:
self._ack_response = message
self._waiting_message_ack_queue.notify()
# Otherwise process it accordingly
if self._message_from_self(message):
if header['method'] == "PUSH" and 'namespace' in header:
self._handle_namespace_payload(header['namespace'],
message['payload'])
else:
l.debug("UNKNOWN msg received by %s" % self._uuid)
else:
# do nothing because the message was from a different device
pass
except Exception as e:
l.error("%s failed to process message because: %s" %
(self._uuid, e))
def _on_log(self, client, userdata, level, buf):
# print("Data: %s - Buff: %s" % (userdata, buf))
pass
def _generate_client_and_app_id(self):
md5_hash = md5()
md5_hash.update(("%s%s" % ("API", self._uuid)).encode("utf8"))
self._app_id = md5_hash.hexdigest()
self._client_id = 'app:%s' % md5_hash.hexdigest()
def _mqtt_message(self, method, namespace, payload):
# Generate a random 16 byte string
randomstring = ''.join(
random.SystemRandom().choice(string.ascii_uppercase +
string.digits) for _ in range(16))
# Hash it as md5
md5_hash = md5()
md5_hash.update(randomstring.encode('utf8'))
messageId = md5_hash.hexdigest().lower()
timestamp = int(round(time.time()))
# Hash the messageId, the key and the timestamp
md5_hash = md5()
strtohash = "%s%s%s" % (messageId, self._key, timestamp)
md5_hash.update(strtohash.encode("utf8"))
signature = md5_hash.hexdigest().lower()
data = {
"header": {
"from": self._client_response_topic,
"messageId":
messageId, # Example: "122e3e47835fefcd8aaf22d13ce21859"
"method": method, # Example: "GET",
"namespace": namespace, # Example: "Appliance.System.All",
"payloadVersion": 1,
"sign":
signature, # Example: "b4236ac6fb399e70c3d61e98fcb68b74",
"timestamp": timestamp
},
"payload": payload
}
strdata = json.dumps(data)
l.debug("--> %s" % strdata)
self._mqtt_client.publish(topic=self._client_request_topic,
payload=strdata.encode("utf-8"))
return messageId
def _wait_for_status(self, status):
ok = False
while not ok:
if not self._status_lock.acquire(True, self._command_timeout):
raise TimeoutError()
ok = status == self._client_status
self._status_lock.release()
def _set_status(self, status):
with self._status_lock:
self._client_status = status
def _execute_cmd(self, method, namespace, payload, timeout=SHORT_TIMEOUT):
# Before executing any command, we need to be subscribed to the MQTT topics where to listen for ACKS.
with self._waiting_subscribers_queue:
while self._client_status != ClientStatus.SUBSCRIBED:
self._waiting_subscribers_queue.wait()
# Execute the command and retrieve the message-id
self._waiting_message_id = self._mqtt_message(
method, namespace, payload)
# Wait synchronously until we get the ACK.
with self._waiting_message_ack_queue:
if not self._waiting_message_ack_queue.wait(timeout=timeout):
# Timeout expired.
raise CommandTimeoutException()
return self._ack_response['payload']
def _message_from_self(self, message):
try:
return 'from' in message['header'] and message['header'][
'from'].split('/')[2] == self._uuid
except:
return False
def _get_consumptionx(self):
return self._execute_cmd("GET", CONSUMPTIONX, {})
def _get_electricity(self):
return self._execute_cmd("GET", ELECTRICITY, {})
def _toggle(self, status):
payload = {"channel": 0, "toggle": {"onoff": status}}
return self._execute_cmd("SET", TOGGLE, payload)
def _togglex(self, channel, status):
payload = {'togglex': {"onoff": status, "channel": channel}}
return self._execute_cmd("SET", TOGGLEX, payload)
def _channel_control_impl(self, channel, status):
if TOGGLE in self.get_abilities():
return self._toggle(status)
elif TOGGLEX in self.get_abilities():
return self._togglex(channel, status)
else:
raise Exception(
"The current device does not support neither TOGGLE nor TOGGLEX."
)
def _handle_namespace_payload(self, namespace, payload):
with self._status_lock:
if namespace == TOGGLE:
self._state[0] = payload['toggle']['onoff'] == 1
elif namespace == TOGGLEX:
if isinstance(payload['togglex'], list):
for c in payload['togglex']:
channel_index = c['channel']
self._state[channel_index] = c['onoff'] == 1
elif isinstance(payload['togglex'], dict):
channel_index = payload['togglex']['channel']
self._state[channel_index] = payload['togglex'][
'onoff'] == 1
else:
raise Exception("Unknown/Unsupported namespace/command: %s" %
namespace)
def _get_status_impl(self):
res = {}
data = self.get_sys_data()['all']
if 'digest' in data:
for c in data['digest']['togglex']:
res[c['channel']] = c['onoff'] == 1
elif 'control' in data:
res[0] = data['control']['toggle']['onoff'] == 1
return res
def _get_channel_id(self, channel):
# Otherwise, if the passed channel looks like the channel spec, lookup its array indexindex
if channel in self._channels:
return self._channels.index(channel)
# if a channel name is given, lookup the channel id from the name
if isinstance(channel, str):
for i, c in enumerate(self.get_channels()):
if c['devName'] == channel:
return c['channel']
# If an integer is given assume that is the channel ID
elif isinstance(channel, int):
return channel
# In other cases return an error
raise Exception("Invalid channel specified.")
def __str__(self):
basic_info = "%s (%s, %d channels, HW %s, FW %s): " % (
self._name, self._type, len(
self._channels), self._hwversion, self._fwversion)
for i, c in enumerate(self._channels):
channel_type = c[
'type'] if 'type' in c else "Master" if c == {} else "Unknown"
channel_state = "On" if self.get_status(i) else "Off"
channel_desc = "%s=%s" % (channel_type, channel_state)
basic_info += channel_desc + ", "
return basic_info
def supports_consumption_reading(self):
return CONSUMPTIONX in self.get_abilities()
def supports_electricity_reading(self):
return ELECTRICITY in self.get_abilities()
def get_power_consumption(self):
if CONSUMPTIONX in self.get_abilities():
return self._get_consumptionx()
else:
# Not supported!
return None
def get_electricity(self):
if ELECTRICITY in self.get_abilities():
return self._get_electricity()
else:
# Not supported!
return None
def device_id(self):
return self._uuid
def get_sys_data(self):
return self._execute_cmd("GET", "Appliance.System.All", {})
def get_channels(self):
return self._channels
def get_wifi_list(self):
return self._execute_cmd("GET",
"Appliance.Config.WifiList", {},
timeout=LONG_TIMEOUT)
def get_trace(self):
return self._execute_cmd("GET", "Appliance.Config.Trace", {})
def get_debug(self):
return self._execute_cmd("GET", "Appliance.System.Debug", {})
def get_abilities(self):
# TODO: Make this cached value expire after a bit...
if self._abilities is None:
self._abilities = self._execute_cmd("GET",
"Appliance.System.Ability",
{})['ability']
return self._abilities
def get_report(self):
return self._execute_cmd("GET", "Appliance.System.Report", {})
def get_channel_status(self, channel):
c = self._get_channel_id(channel)
return self.get_status(c)
def turn_on_channel(self, channel):
c = self._get_channel_id(channel)
return self._channel_control_impl(c, 1)
def turn_off_channel(self, channel):
c = self._get_channel_id(channel)
return self._channel_control_impl(c, 0)
def turn_on(self, channel=0):
c = self._get_channel_id(channel)
return self._channel_control_impl(c, 1)
def turn_off(self, channel=0):
c = self._get_channel_id(channel)
return self._channel_control_impl(c, 0)
def get_status(self, channel=0):
# In order to optimize the network traffic, we don't call the get_status() api at every request.
# On the contrary, we only call it the first time. Then, the rest of the API will silently listen
# for state changes and will automatically update the self._state structure listening for
# messages of the device.
# Such approach, however, has a side effect. If we call TOGGLE/TOGGLEX and immediately after we call
# get_status(), the reported status will be still the old one. This is a race condition because the
# "status" RESPONSE will be delivered some time after the TOGGLE REQUEST. It's not a big issue for now,
# and synchronizing the two things would be inefficient and probably not very useful.
# Just remember to wait some time before testing the status of the item after a toggle.
with self._status_lock:
c = self._get_channel_id(channel)
if self._state is None:
self._state = self._get_status_impl()
return self._state[c]
def get_usb_channel_index(self):
# Look for the usb channel
for i, c in enumerate(self.get_channels()):
if 'type' in c and c['type'] == 'USB':
return i
return None
def enable_usb(self):
c = self.get_usb_channel_index()
if c is None:
return
else:
return self.turn_on_channel(c)
def disable_usb(self):
c = self.get_usb_channel_index()
if c is None:
return
else:
return self.turn_off_channel(c)
def get_usb_status(self):
c = self.get_usb_channel_index()
if c is None:
return
else:
return self.get_channel_status(c)