Discovering devices
Discovery
Discovery works by sending broadcast UDP packets to two known TP-link discovery ports, 9999 and 20002.
Port 9999 is used for legacy devices that do not use strong encryption and 20002 is for newer devices that use different
levels of encryption.
If a device uses port 20002 for discovery you will obtain some basic information from the device via discovery, but you
will need to await SmartDevice.update()
to get full device information.
Credentials will most likely be required for port 20002 devices although if the device has never been connected to the tplink
cloud it may work without credentials.
To query or update the device requires authentication via Credentials
and if this is invalid or not provided it
will raise an AuthenticationException
.
If discovery encounters an unsupported device when calling via Discover.discover_single()
it will raise a UnsupportedDeviceException
.
If discovery encounters a device when calling Discover.discover()
,
you can provide a callback to the on_unsupported
parameter
to handle these.
Example:
import asyncio
from kasa import Discover, Credentials
async def main():
device = await Discover.discover_single(
"127.0.0.1",
credentials=Credentials("myusername", "mypassword"),
discovery_timeout=10
)
await device.update() # Request the update
print(device.alias) # Print out the alias
devices = await Discover.discover(
credentials=Credentials("myusername", "mypassword"),
discovery_timeout=10
)
for ip, device in devices.items():
await device.update()
print(device.alias)
if __name__ == "__main__":
asyncio.run(main())
API documentation
- class kasa.Discover[source]
Discover TPLink Smart Home devices.
The main entry point for this library is
Discover.discover()
, which returns a dictionary of the found devices. The key is the IP address of the device and the value contains ready-to-use, SmartDevice-derived device object.discover_single()
can be used to initialize a single device given its IP address. If theDeviceConfig
of the device is already known, you can initialize the corresponding device class directly without discovery.The protocol uses UDP broadcast datagrams on port 9999 and 20002 for discovery. Legacy devices support discovery on port 9999 and newer devices on 20002.
Newer devices that respond on port 20002 will most likely require TP-Link cloud credentials to be passed if queries or updates are to be performed on the returned devices.
- Examples:
Discovery returns a list of discovered devices:
>>> import asyncio >>> found_devices = asyncio.run(Discover.discover()) >>> [dev.alias for dev in found_devices] ['TP-LINK_Power Strip_CF69']
Discovery can also be targeted to a specific broadcast address instead of the default 255.255.255.255:
>>> asyncio.run(Discover.discover(target="192.168.8.255"))
It is also possible to pass a coroutine to be executed for each found device:
>>> async def print_alias(dev): >>> print(f"Discovered {dev.alias}") >>> devices = asyncio.run(Discover.discover(on_discovered=print_alias))
- DISCOVERY_PORT = 9999
- DISCOVERY_PORT_2 = 20002
- DISCOVERY_QUERY = {'system': {'get_sysinfo': None}}
- DISCOVERY_QUERY_2 = b'\x02\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00F<\xb5\xd3'
- async static discover(*, target='255.255.255.255', on_discovered=None, discovery_timeout=5, discovery_packets=3, interface=None, on_unsupported=None, credentials=None, port=None, timeout=None) Dict[str, Device] [source]
Discover supported devices.
Sends discovery message to 255.255.255.255:9999 and 255.255.255.255:20002 in order to detect available supported devices in the local network, and waits for given timeout for answers from devices. If you have multiple interfaces, you can use target parameter to specify the network for discovery.
If given, on_discovered coroutine will get awaited with a
SmartDevice
-derived object as parameter.The results of the discovery are returned as a dict of
SmartDevice
-derived objects keyed with IP addresses. The devices are already initialized and all but emeter-related properties can be accessed directly.- Parameters:
target – The target address where to send the broadcast discovery queries if multi-homing (e.g. 192.168.xxx.255).
on_discovered – coroutine to execute on discovery
discovery_timeout – Seconds to wait for responses, defaults to 5
discovery_packets – Number of discovery packets to broadcast
interface – Bind to specific interface
on_unsupported – Optional callback when unsupported devices are discovered
credentials – Credentials for devices requiring authentication
port – Override the discovery port for devices listening on 9999
timeout – Query timeout in seconds for devices returned by discovery
- Returns:
dictionary with discovered devices
- async static discover_single(host: str, *, discovery_timeout: int = 5, port: int | None = None, timeout: int | None = None, credentials: kasa.credentials.Credentials | None = None) Device [source]
Discover a single device by the given IP address.
It is generally preferred to avoid
discover_single()
and useSmartDevice.connect()
instead as it should perform better when the WiFi network is congested or the device is not responding to discovery requests.- Parameters:
host – Hostname of device to query
discovery_timeout – Timeout in seconds for discovery
port – Optionally set a different port for legacy devices using port 9999
timeout – Timeout in seconds device for devices queries
credentials – Credentials for devices that require authentication
- Return type:
SmartDevice
- Returns:
Object for querying/controlling found device.