Add ToDo

Author: bloft

ToDo.md

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+# ToDo:
+
+## Improvements
+
+Change MqttMap to include reference to mqttclient
+ * Change loop, publish, ... to not need mqttclient
+
+Add connected + will to indicate if device is online
+
+Add better debugging (remote ?)
+
+## Future
+
+Add support for filters
+ * Don't send if value is the same as last.
+ * Don't send if value is Nan
+
+Add support for float type (extend MqttMap)
+
+Add publish configured endpoints, to support openhab2 auto configure
+
+Add web interface