EasyCheck does not resensitize #5
Description
There is a known issue withe EasyCheck not to understand the SIP 100-message (Return item, not ok). This message is generated e.g. if the item in question is not on loan and still returned via the self service. While we thought about the frownie displayed as a nasty detail in the past, we did not notice that EasyCheck did not only not understand this message but effectively remove any sensitization on the RFID chips.
IOW with the current code we do not get a frownie but the easiest way to check out items without the necessity to use your library card is just check them in. This will switch the RFID chip to unsensitive and avoid any alerts by the gates.
The solution seems to be to issue a 101-return all the time to get EasyCheck to resensitize the chips on every return. (It doesn't hurt if they are sensitive already.)