OpcUa Server on a embedded device with no time source

[Marco Reichert]

Hello,

I am running open62541 successfully on an embedded device without battery for the internal RTC.
This device will most likely be used in the future in networks without internet access and also without NTP server.

The only time information it has is the number of milliseconds since its system start.

Is it acceptable to provide timestamps like UA_DATETIME_UNIX_EPOCH + [milliseconds since power on] or is it possible to sync the server time with the client once one is connected?

With kind regards
Marco

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[Julius Pfrommer]

Have a look here for clock synchronization in OPC UA: https://reference.opcfoundation.org/v104/Core/docs/Part6/6.3/

The standard wants you to only send UTC timestamps.

If no clock source is available, to me, send what you have and document it to handle the fallout in the application layer.

Regards

Julius