update()

Requests the tag to take a temperature measurement and send the result back immediately or in near future. If the tag is in hibernate mode due to being out of range for too long, this will also re-configure the stored auto-update interval to the tag.

If the tag is WeMo switch, this method will update the switch status in the lit property in returned tag object.

Generally this method works the same way as the "update" button in the web/android app, for example if the tag is Dropcam, the streaming on/off status will be refreshed and stored in the lit property.

Arguments

none.

Returns

If successful, will return a tag object with updated temperature, signal strength (rssi), battery voltage, txpwr, etc. If tag did not respond, will return null.