This is awesome! This kind of extreme low-power application was the original reason I wanted Mosh -- I always thought it would be awesome to have a wireless (hand-cranked?) laptop that could run SSH and would only consume energy when (a) a key was pressed [to update the locally generated UI], or (b) it wanted to fire up the radio (on its chosen schedule, e.g. <1 Hz) to retrieve an update from the server of the "ground truth" UI and reconcile that with the local prediction.