ZKTeco Attendance (verified/access denied) display label control

[htunhtun-lin]

I have my ZKTeco device connected to Raspberry PI.
What I am doing is If an employee doing check out without check in in a single day, I would like to show access denied in display panel.
Right now I can send voice of access denied. But the display panel still showing user verified which is kind of weird.
Is there any way to have control over display label? :(

[quochungngo]

I have the same problem.
My issue is about verifying a finger/face is valid or not in real-time. I use a model of ZKteco-MB20 on platform ZLM60-TFT.
I have tried to use the event OnVerify by using Event-Mask = (1<<7) (for event EF-VERIFY) and Event-Mask = 0xffff (for all events).
After that, I tried a valid finger and an invalid finger on my model ZKteco-MB20 to check if there is any message that the machine sends to my PC (I use wireshark to catch TCP/IP messages). But nothing happens.
I read the TFT_SDK to check the description of OnVerify event and find that it is fit my context. I dont know why it does not work.
Please give me some advice. Thank you very much.