IPP=P, APP=Error is an error in the UIC TS890 Terminal produced when I tried running a user application in a Production Terminal Mode without certificate.
I’ve loaded the application using the UIC development environment with UIC Eclipse on the TS890 device via Ethernet.
This error is due to the lack of a production certificate for the user application in a production mode device. The error specifically means “decrypting public key error”.
In order to develop applications for this kind of countertop system is required to have the three secret passwords (you’ll find them in the documents of UIC) the first password to enter the boot, then option 9. “reset to default”, that option will ask for the other two passwords in order to change the terminal from production to development mode.