新特性- Add simple charts for each serie, next to current value.- Add trends for each serie, next to current value.- Fetch data for series from the server's databases instead of via MQTT (data for devices of all types should be available right away).- Add automatic data refresh if the data is stale, after bringing app to foreground.- Change PWM controls for LK (with SW 1.49+)- Improve visual feedback of using output button.- Fix some stability issues (addresses blank screen cases).