Added plugin relay metaclass. /JL

src/pluginlib/__init__.py

@@ -1 +1,2 @@
-from . import plugin_init
+from . import pluginlib_init
+from . import pluginlib_relay

src/pluginlib/pluginlib.ini

@@ -1,3 +1,3 @@
 [pluginlib]
-build = 3
+build = 5
 

src/pluginlib/pluginlib_relay.py

@@ -0,0 +1,24 @@
+from abc import ABCMeta, abstractmethod
+
+
+class RelayBase(metaclass=ABCMeta):
+    """Base class for relay plugins"""
+
+    def __init__(self) -> None:
+        """Define base attributes."""
+        self.connected = False
+
+    @abstractmethod
+    def disconnect(self) -> None:
+        """Disconnects relay."""
+
+    @abstractmethod
+    def connect(self) -> None:
+        """Connects relay."""
+
+    @abstractmethod
+    def reconnect(self, seconds: int) -> None:
+        """Disconnects for specified time and reconnects.
+        Args:
+            seconds (int): Amount of time to sleep between disconnect and connect.
+        """