Immigration biometric zkteco device

Hi All
I am completely new to ERPNext,
I got this link GitHub - frappe/biometric-attendance-sync-tool: A simple tool for syncing Biometric Attendance data with your ERPNext server
But I couldn’t deal with it and I can’t connect the biometric device to the ERPNext system
Can you help me with that
And what do I need to develop on the ERPNEXT system?
I know this question has been discussed a lot
Thanks for your time

If you are connecting your devices through internet, make sure to port forward your router

Check if the following Biometric Integration service with ERPNext helps you.