Update scanner firmware

Update the scanner's firmware, either via fetching it from the server, or by using a locally stored image

Required

• The device must be connected to the scanner
• The variable temp/firmware needs to contain a valid update string.
• The variable temp/scanner needs to contain valid scanner information.

Effects

• The scanner's firmware is updated
• The scanner is restarted
• The app disconnects from the scanner

Function exits

• On success: The update was successful