Failure handing #9
Description
If for any reason, you cannot successfully capture and deliver the messages, change the Mode to Failure.
In Failure Mode, the system behaves the same as in Transmitting mode.
In Failure Mode, the main difference is for the icon to show the state is not good. Maybe some sort of alert ! icon is appropriate.
When in Failure Mode, do not attempt to be helpful for the user. These ideas will be explored later in #8