I want to know what technology is used to implement the underlying technology of Peer Systems. I did not find the corresponding code in the source code.

[LkZtCode]

I want to know what technology is used to implement the underlying technology of Peer Systems. I did not find the corresponding code in the source code.

[primetomas]

Peer connectors is an Enterprise feature, so you will not find the source here.
It's documented here: https://doc.primekey.com/ejbca/ejbca-operations/ejbca-operations-guide/ca-operations-guide/peer-systems-operations

[LkZtCode]

Do Peer Systems communicate two-way?
For example, if CA registers with RA through Peer Systems, how does RA synchronize information to CA? Because RA, as a server, does not have the ability to push messages to CA.

[primetomas]

It is fairly detailed described here: https://doc.primekey.com/ejbca/ejbca-operations/ejbca-ca-concept-guide/peer-systems

Is there any information you miss on that page?