diff --git a/kasa/discover.py b/kasa/discover.py
index 4a3d0a74..7aaf8524 100755
--- a/kasa/discover.py
+++ b/kasa/discover.py
@@ -54,7 +54,9 @@ class _DiscoverProtocol(asyncio.DatagramProtocol):
         sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
         sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
         if self.interface is not None:
-            sock.setsockopt(socket.SOL_SOCKET, socket.SO_BINDTODEVICE, self.interface.encode())
+            sock.setsockopt(
+                socket.SOL_SOCKET, socket.SO_BINDTODEVICE, self.interface.encode()
+            )
 
         self.do_discover()
 
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 00000000..f27a54d0
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,1071 @@
+[[package]]
+category = "main"
+description = "A configurable sidebar-enabled Sphinx theme"
+name = "alabaster"
+optional = true
+python-versions = "*"
+version = "0.7.12"
+
+[[package]]
+category = "main"
+description = "High level compatibility layer for multiple asynchronous event loop implementations"
+name = "anyio"
+optional = false
+python-versions = ">=3.5.3"
+version = "1.4.0"
+
+[package.dependencies]
+async-generator = "*"
+idna = ">=2.8"
+sniffio = ">=1.1"
+
+[package.extras]
+curio = ["curio (>=0.9)"]
+doc = ["sphinx-rtd-theme", "sphinx-autodoc-typehints (>=1.2.0)"]
+test = ["coverage (>=4.5)", "hypothesis (>=4.0)", "pytest (>=3.7.2)", "uvloop"]
+trio = ["trio (>=0.12)"]
+
+[[package]]
+category = "dev"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+name = "appdirs"
+optional = false
+python-versions = "*"
+version = "1.4.4"
+
+[[package]]
+category = "main"
+description = "Async generators and context managers for Python 3.5+"
+name = "async-generator"
+optional = false
+python-versions = ">=3.5"
+version = "1.10"
+
+[[package]]
+category = "main"
+description = "A simple anyio-compatible fork of Click, for powerful command line utilities."
+name = "asyncclick"
+optional = false
+python-versions = ">=3.6"
+version = "7.0.9"
+
+[package.dependencies]
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+
+[package.extras]
+dev = ["coverage", "pytest-runner", "pytest-trio", "pytest (>=3)", "sphinx", "tox"]
+docs = ["sphinx"]
+
+[[package]]
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+description = "Atomic file writes."
+marker = "sys_platform == \"win32\""
+name = "atomicwrites"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.4.0"
+
+[[package]]
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+description = "Classes Without Boilerplate"
+name = "attrs"
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+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "19.3.0"
+
+[package.extras]
+azure-pipelines = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "pytest-azurepipelines"]
+dev = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "pre-commit"]
+docs = ["sphinx", "zope.interface"]
+tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+
+[[package]]
+category = "main"
+description = "Internationalization utilities"
+name = "babel"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.8.0"
+
+[package.dependencies]
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+
+[[package]]
+category = "main"
+description = "Python package for providing Mozilla's CA Bundle."
+name = "certifi"
+optional = false
+python-versions = "*"
+version = "2020.6.20"
+
+[[package]]
+category = "dev"
+description = "Validate configuration and produce human readable error messages."
+name = "cfgv"
+optional = false
+python-versions = ">=3.6.1"
+version = "3.1.0"
+
+[[package]]
+category = "main"
+description = "Universal encoding detector for Python 2 and 3"
+name = "chardet"
+optional = false
+python-versions = "*"
+version = "3.0.4"
+
+[[package]]
+category = "dev"
+description = "Hosted coverage reports for GitHub, Bitbucket and Gitlab"
+name = "codecov"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.1.8"
+
+[package.dependencies]
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+requests = ">=2.7.9"
+
+[[package]]
+category = "main"
+description = "Cross-platform colored terminal text."
+marker = "sys_platform == \"win32\" or platform_system == \"Windows\""
+name = "colorama"
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+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.4.3"
+
+[[package]]
+category = "dev"
+description = "Code coverage measurement for Python"
+name = "coverage"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
+version = "5.2.1"
+
+[package.extras]
+toml = ["toml"]
+
+[[package]]
+category = "dev"
+description = "Distribution utilities"
+name = "distlib"
+optional = false
+python-versions = "*"
+version = "0.3.1"
+
+[[package]]
+category = "main"
+description = "Docutils -- Python Documentation Utilities"
+name = "docutils"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.16"
+
+[[package]]
+category = "dev"
+description = "A platform independent file lock."
+name = "filelock"
+optional = false
+python-versions = "*"
+version = "3.0.12"
+
+[[package]]
+category = "dev"
+description = "File identification library for Python"
+name = "identify"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+version = "1.4.25"
+
+[package.extras]
+license = ["editdistance"]
+
+[[package]]
+category = "main"
+description = "Internationalized Domain Names in Applications (IDNA)"
+name = "idna"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.10"
+
+[[package]]
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+name = "imagesize"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.2.0"
+
+[[package]]
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+name = "importlib-metadata"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
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+
+[package.dependencies]
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+
+[package.extras]
+docs = ["sphinx", "rst.linker"]
+testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
+
+[[package]]
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+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "2.11.2"
+
+[package.dependencies]
+MarkupSafe = ">=0.23"
+
+[package.extras]
+i18n = ["Babel (>=0.8)"]
+
+[[package]]
+category = "main"
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+name = "m2r"
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+
+[package.dependencies]
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+
+[[package]]
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+name = "markupsafe"
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+version = "1.1.1"
+
+[[package]]
+category = "main"
+description = "The fastest markdown parser in pure Python"
+name = "mistune"
+optional = true
+python-versions = "*"
+version = "0.8.4"
+
+[[package]]
+category = "dev"
+description = "More routines for operating on iterables, beyond itertools"
+name = "more-itertools"
+optional = false
+python-versions = ">=3.5"
+version = "8.4.0"
+
+[[package]]
+category = "dev"
+description = "Node.js virtual environment builder"
+name = "nodeenv"
+optional = false
+python-versions = "*"
+version = "1.4.0"
+
+[[package]]
+category = "main"
+description = "Core utilities for Python packages"
+name = "packaging"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "20.4"
+
+[package.dependencies]
+pyparsing = ">=2.0.2"
+six = "*"
+
+[[package]]
+category = "dev"
+description = "plugin and hook calling mechanisms for python"
+name = "pluggy"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "0.13.1"
+
+[package.dependencies]
+[package.dependencies.importlib-metadata]
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+
+[package.extras]
+dev = ["pre-commit", "tox"]
+
+[[package]]
+category = "dev"
+description = "A framework for managing and maintaining multi-language pre-commit hooks."
+name = "pre-commit"
+optional = false
+python-versions = ">=3.6.1"
+version = "2.6.0"
+
+[package.dependencies]
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+identify = ">=1.0.0"
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+pyyaml = ">=5.1"
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+virtualenv = ">=20.0.8"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = "*"
+
+[[package]]
+category = "dev"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+name = "py"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.9.0"
+
+[[package]]
+category = "main"
+description = "Pygments is a syntax highlighting package written in Python."
+name = "pygments"
+optional = true
+python-versions = ">=3.5"
+version = "2.6.1"
+
+[[package]]
+category = "main"
+description = "Python parsing module"
+name = "pyparsing"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+version = "2.4.7"
+
+[[package]]
+category = "dev"
+description = "pytest: simple powerful testing with Python"
+name = "pytest"
+optional = false
+python-versions = ">=3.5"
+version = "5.4.3"
+
+[package.dependencies]
+atomicwrites = ">=1.0"
+attrs = ">=17.4.0"
+colorama = "*"
+more-itertools = ">=4.0.0"
+packaging = "*"
+pluggy = ">=0.12,<1.0"
+py = ">=1.5.0"
+wcwidth = "*"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = ">=0.12"
+
+[package.extras]
+checkqa-mypy = ["mypy (v0.761)"]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
+
+[[package]]
+category = "dev"
+description = "Pytest support for asyncio."
+name = "pytest-asyncio"
+optional = false
+python-versions = ">= 3.5"
+version = "0.14.0"
+
+[package.dependencies]
+pytest = ">=5.4.0"
+
+[package.extras]
+testing = ["async-generator (>=1.3)", "coverage", "hypothesis (>=5.7.1)"]
+
+[[package]]
+category = "dev"
+description = "Formatting PyTest output for Azure Pipelines UI"
+name = "pytest-azurepipelines"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "0.8.0"
+
+[package.dependencies]
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+
+[[package]]
+category = "dev"
+description = "Pytest plugin for measuring coverage."
+name = "pytest-cov"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "2.10.0"
+
+[package.dependencies]
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+pytest = ">=4.6"
+
+[package.extras]
+testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "pytest-xdist", "virtualenv"]
+
+[[package]]
+category = "dev"
+description = "Thin-wrapper around the mock package for easier use with pytest"
+name = "pytest-mock"
+optional = false
+python-versions = ">=3.5"
+version = "3.2.0"
+
+[package.dependencies]
+pytest = ">=2.7"
+
+[package.extras]
+dev = ["pre-commit", "tox", "pytest-asyncio"]
+
+[[package]]
+category = "dev"
+description = "pytest-sugar is a plugin for pytest that changes the default look and feel of pytest (e.g. progressbar, show tests that fail instantly)."
+name = "pytest-sugar"
+optional = false
+python-versions = "*"
+version = "0.9.4"
+
+[package.dependencies]
+packaging = ">=14.1"
+pytest = ">=2.9"
+termcolor = ">=1.1.0"
+
+[[package]]
+category = "main"
+description = "World timezone definitions, modern and historical"
+name = "pytz"
+optional = true
+python-versions = "*"
+version = "2020.1"
+
+[[package]]
+category = "dev"
+description = "YAML parser and emitter for Python"
+name = "pyyaml"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "5.3.1"
+
+[[package]]
+category = "main"
+description = "Python HTTP for Humans."
+name = "requests"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "2.24.0"
+
+[package.dependencies]
+certifi = ">=2017.4.17"
+chardet = ">=3.0.2,<4"
+idna = ">=2.5,<3"
+urllib3 = ">=1.21.1,<1.25.0 || >1.25.0,<1.25.1 || >1.25.1,<1.26"
+
+[package.extras]
+security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
+socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7)", "win-inet-pton"]
+
+[[package]]
+category = "main"
+description = "Python 2 and 3 compatibility utilities"
+name = "six"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+version = "1.15.0"
+
+[[package]]
+category = "main"
+description = "Sniff out which async library your code is running under"
+name = "sniffio"
+optional = false
+python-versions = ">=3.5"
+version = "1.1.0"
+
+[[package]]
+category = "main"
+description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
+name = "snowballstemmer"
+optional = true
+python-versions = "*"
+version = "2.0.0"
+
+[[package]]
+category = "main"
+description = "Python documentation generator"
+name = "sphinx"
+optional = true
+python-versions = ">=3.5"
+version = "3.1.2"
+
+[package.dependencies]
+Jinja2 = ">=2.3"
+Pygments = ">=2.0"
+alabaster = ">=0.7,<0.8"
+babel = ">=1.3"
+colorama = ">=0.3.5"
+docutils = ">=0.12"
+imagesize = "*"
+packaging = "*"
+requests = ">=2.5.0"
+setuptools = "*"
+snowballstemmer = ">=1.1"
+sphinxcontrib-applehelp = "*"
+sphinxcontrib-devhelp = "*"
+sphinxcontrib-htmlhelp = "*"
+sphinxcontrib-jsmath = "*"
+sphinxcontrib-qthelp = "*"
+sphinxcontrib-serializinghtml = "*"
+
+[package.extras]
+docs = ["sphinxcontrib-websupport"]
+lint = ["flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.780)", "docutils-stubs"]
+test = ["pytest", "pytest-cov", "html5lib", "typed-ast", "cython"]
+
+[[package]]
+category = "main"
+description = "Read the Docs theme for Sphinx"
+name = "sphinx-rtd-theme"
+optional = true
+python-versions = "*"
+version = "0.5.0"
+
+[package.dependencies]
+sphinx = "*"
+
+[package.extras]
+dev = ["transifex-client", "sphinxcontrib-httpdomain", "bump2version"]
+
+[[package]]
+category = "main"
+description = "sphinxcontrib-applehelp is a sphinx extension which outputs Apple help books"
+name = "sphinxcontrib-applehelp"
+optional = true
+python-versions = ">=3.5"
+version = "1.0.2"
+
+[package.extras]
+lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
+
+[[package]]
+category = "main"
+description = "sphinxcontrib-devhelp is a sphinx extension which outputs Devhelp document."
+name = "sphinxcontrib-devhelp"
+optional = true
+python-versions = ">=3.5"
+version = "1.0.2"
+
+[package.extras]
+lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
+
+[[package]]
+category = "main"
+description = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
+name = "sphinxcontrib-htmlhelp"
+optional = true
+python-versions = ">=3.5"
+version = "1.0.3"
+
+[package.extras]
+lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest", "html5lib"]
+
+[[package]]
+category = "main"
+description = "A sphinx extension which renders display math in HTML via JavaScript"
+name = "sphinxcontrib-jsmath"
+optional = true
+python-versions = ">=3.5"
+version = "1.0.1"
+
+[package.extras]
+test = ["pytest", "flake8", "mypy"]
+
+[[package]]
+category = "main"
+description = "Sphinx extension to include program output"
+name = "sphinxcontrib-programoutput"
+optional = true
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
+version = "0.16"
+
+[package.dependencies]
+Sphinx = ">=1.7.0"
+
+[[package]]
+category = "main"
+description = "sphinxcontrib-qthelp is a sphinx extension which outputs QtHelp document."
+name = "sphinxcontrib-qthelp"
+optional = true
+python-versions = ">=3.5"
+version = "1.0.3"
+
+[package.extras]
+lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
+
+[[package]]
+category = "main"
+description = "sphinxcontrib-serializinghtml is a sphinx extension which outputs \"serialized\" HTML files (json and pickle)."
+name = "sphinxcontrib-serializinghtml"
+optional = true
+python-versions = ">=3.5"
+version = "1.1.4"
+
+[package.extras]
+lint = ["flake8", "mypy", "docutils-stubs"]
+test = ["pytest"]
+
+[[package]]
+category = "dev"
+description = "ANSII Color formatting for output in terminal."
+name = "termcolor"
+optional = false
+python-versions = "*"
+version = "1.1.0"
+
+[[package]]
+category = "dev"
+description = "Python Library for Tom's Obvious, Minimal Language"
+name = "toml"
+optional = false
+python-versions = "*"
+version = "0.10.1"
+
+[[package]]
+category = "dev"
+description = "tox is a generic virtualenv management and test command line tool"
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+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
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+
+[package.dependencies.importlib-metadata]
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+version = ">=0.12,<2"
+
+[package.extras]
+docs = ["pygments-github-lexers (>=0.0.5)", "sphinx (>=2.0.0)", "sphinxcontrib-autoprogram (>=0.1.5)", "towncrier (>=18.5.0)"]
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+
+[[package]]
+category = "main"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+name = "urllib3"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
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+socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7,<2.0)"]
+
+[[package]]
+category = "dev"
+description = "Virtual Python Environment builder"
+name = "virtualenv"
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diff --git a/pyproject.toml b/pyproject.toml
index 206b7867..1bdf1716 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,24 +19,24 @@ importlib-metadata = "*"
 asyncclick = "^7"
 
 # required only for docs
-sphinx = { version = "^3.1.1", optional = true }
-m2r = { version = "^0.2.1", optional = true }
-sphinx_rtd_theme = { version = "^0.5.0", optional = true }
-sphinxcontrib-programoutput = { version = "^0.16", optional = true }
+sphinx = { version = "^3", optional = true }
+m2r = { version = "^0", optional = true }
+sphinx_rtd_theme = { version = "^0", optional = true }
+sphinxcontrib-programoutput = { version = "^0", optional = true }
 
 [tool.poetry.dev-dependencies]
 pytest = "^5"
-pytest-azurepipelines = "^0.8"
-pytest-cov = "^2.8"
-pytest-asyncio = "^0.12"
+pytest-azurepipelines = "^0"
+pytest-cov = "^2"
+pytest-asyncio = "^0"
 pytest-sugar = "*"
 pre-commit = "*"
 voluptuous = "*"
 toml = "*"
 tox = "*"
-pytest-mock = "^3.1.0"
-codecov = "^2.0"
-xdoctest = "^0.12"
+pytest-mock = "^3"
+codecov = "^2"
+xdoctest = "^0"
 
 [tool.poetry.extras]
 docs = ["sphinx", "sphinx_rtd_theme", "m2r", "sphinxcontrib-programoutput"]