I'm working with a ZKTeco SpeedFace-V3L device and it's able to connect to my server (I see logs for /iclock/cdata and /iclock/registry), but it's not sending any attendance data. The POST requests to /iclock/cdata arrive, but the body is empty, so I can't extract the check-in logs (e.g., ATTLOG).

Has anyone experienced this issue where the device connects but doesn't push user attendance logs?

• Firmware version: ZMM510-NF24VB-Ver1.2.7

• I'm using a custom Flask server to receive data on /iclock/cdata.

Any idea how to configure the device or trigger log uploads?