You can find the entire repo here.

config/custom_components/sensor/minecraft.py

@@ -0,0 +1,82 @@
+"""
+Sensor to check the status of a Minecraft server.
+
+"""
+import logging
+from homeassistant.helpers.entity import Entity
+ATTR_USERS = 'users_online'
+ATTR_MAX = 'users_max'
+ATTR_MOTD = 'MOTD'
+ATTR_VERSION = 'Version'
+ICON = 'mdi:minecraft'
+REQUIREMENTS = ['mcstatus==2.1']
+
+# pylint: disable=unused-argument
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Setup the Minecraft server platform."""
+    from mcstatus import MinecraftServer as mcserver
+    logger = logging.getLogger(__name__)
+
+    server = config.get('server')
+    name = config.get('name')
+
+    if server is None:
+        logger.error('No server specified')
+        return False
+    elif name is None:
+        logger.error('No name specified')
+        return False
+
+    add_devices([
+        MCServerSensor(server, name, mcserver)
+    ])
+
+
+class MCServerSensor(Entity):
+    """A class for the Minecraft server."""
+
+    # pylint: disable=abstract-method
+    def __init__(self, server, name, mcserver):
+        """Initialize the sensor."""
+        self._mcserver = mcserver
+        self._server = server
+        self._name = name
+        self.update()
+
+    @property
+    def name(self):
+        """Return the name of the server."""
+        return self._name
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._state
+
+    # pylint: disable=no-member
+    def update(self):
+        """Update device state."""
+        status = self._mcserver.lookup(self._server).status()
+        query = self._mcserver.lookup(self._server).query()
+        self._state = status.players.online
+        #self._max = str(status.players.max)
+        self._max = status.players.max
+        self._users = query.players.names
+        self._motd = query.motd
+        self._version = query.software.version
+
+
+    @property
+    def device_state_attributes(self):
+        """Return the state attributes."""
+        return {
+       ATTR_USERS: self._users,
+       ATTR_MAX: self._max,
+       ATTR_MOTD: self._motd,
+       ATTR_VERSION: self._version
+        }
+
+    @property
+    def icon(self):
+        """Return the icon to use in the frontend."""
+        return ICON