Fetch scanner wifi name

Send the stored scanner's serial number to the biozoom server, and retrieve a wifi name for this scanner.

Required

• The variable temp/serial needs to exist and contain the last part of the serial (at least 4 characters are suggested).

Effects

• Stores the fetched wifi name as persistentValues/SCANNER_WIFI

Function exits

• On success: The given serial was unique and could be mapped to a wifi name
• On ambiguous: More than one scanner fit the given substring, and a bigger part of the serial number is required