Add FlushSocket before reading input

[ejorritsma]

When reading input from the socket, often you will read leftover data from it.
This results in static noise, because you're reading previously scanned RFID's.

The FlushSocket function will flush the socket by reading the buffer size from the socket and discarding it. This will have tests succeed in the PDS codebase.

Please take a look and see if this is the proper solution, I feel it might not be an industry standard way of solving this probably quite common problem. The reason I picked this solutoin, instead of filtering out the noise, is because the RFID scanner sends its RFID's over the socket without delimiters, making parsing impossible.

[tluijken]

Wat als we de buffer definieren vlak voor gebruik. Zeg, op regel 105? Krijg je dan niet hetzelfde effect? Dan kan de hele flush methode eruit. Voelt nu alsof we 2 keer hetzelfde doen.

[ejorritsma]

Goed punt, ik heb het verwerkt en opnieuw getest. Het lijkt erop dat het toch niet helemaal hetzelfde is...

+> info: [PDMS.Dispatcher.Tests.Mocks.SickRfidScannerMock] Sending response :\x02sAN MIStartIn\x03
+> info: [PDMS.Dispatcher.Tests.Mocks.SickRfidScannerMock] Sending response :\x02sAN MIStopIn\x03
+> info: [PDMS.Dispatcher.Tests.Mocks.SickRfidScannerMock] Sending RFID 91456789415679
+> warn: [PDMS.Dispatcher.Core.Implementation.BinService] Could not find bin in repository for bin tag 914567894156789145678941567891456789415678914567

Ik heb ook de code met de flush methode nog even gerund als sanity check, en die werkt wel. (Met deze test "Dispatch VS22-0009 plates are all in 3 different trays, but one tray has all the plates" )

🤔