Added lxmd telemetry plugin to examples

docs/example_plugins/lxmd_telemetry.py

@@ -0,0 +1,41 @@
+# This is an LXMd telemetry plugin that
+# queries a running LXMF Propagation Node
+# for status and statistics.
+
+import RNS
+
+class LXMdTelemetryPlugin(SidebandTelemetryPlugin):
+    plugin_name = "lxmd_telemetry"
+
+    def start(self):
+        # Do any initialisation work here
+        RNS.log("LXMd telemetry plugin starting...")
+
+        # And finally call start on superclass
+        super().start()
+
+    def stop(self):
+        # Do any teardown work here
+        pass
+
+        # And finally call stop on superclass
+        super().stop()
+
+    def update_telemetry(self, telemeter):
+        if telemeter != None:
+            if not "lxmf_propagation" in telemeter.sensors:
+                # Create lxmd status sensor if it is not already
+                # enabled in the running telemeter instance
+                telemeter.enable("lxmf_propagation")
+
+                # Set the identity file used to communicate with
+                # the running LXMd instance.
+                telemeter.sensors["lxmf_propagation"].set_identity("~/.lxmd/identity")
+
+                # You can also get LXMF Propagation Node stats
+                # from an LXMd instance running inside nomadnet
+                # telemeter.sensors["lxmf_propagation"].set_identity("~/.nomadnetwork/storage/identity")
+
+# Finally, tell Sideband what class in this
+# file is the actual plugin class.
+plugin_class = LXMdTelemetryPlugin