The rc_cube provides timestamps with all images and messages. To compare these with the time on the application host, the time needs to be properly synchronized.
The time synchronization between the rc_cube and the application host can be done via the Network Time Protocol (NTP), which is activated by default.
Internal time synchronization between the rc_cube and the connected camera is automatically done via the Precision Time Protocol (PTP).
Depending on the reachability of NTP servers or PTP masters it might take up to several minutes until the time is synchronized.
The Network Time Protocol (NTP) is a TCP/IP protocol for synchronizing time over a network. A client periodically requests the current time from a server, and uses it to set and correct its own clock.
By default the rc_cube tries to reach NTP servers from the NTP Pool Project, which will work if the rc_cube has access to the internet.
If the rc_cube is configured for DHCP (which is the default setting), it will also request NTP servers from the DHCP server and try to use those.
The Precision Time Protocol (PTP, also known as IEEE1588) is a protocol which offers more precise and robust clock synchronization than with NTP.
Currently, time synchronization between the application host and the rc_cube is not implemented. Please use NTP instead.