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On a linux server one can use "openssl s_server" in order to obtain the keys. I used the command

# openssl s_server  -port 443 -cert <path to cert.pem> -key <path to privkey.pem> -CAfile <path to chain.pem>   -keylogfile <path to keylog file>

The values in < ...> have to be replaced by your settings. The schedule for decrypting TLS traffic is:

1. start the openssl s_server by the command above
2. start capturing with Wireshark
3. establish TLS connection to the openssl server (e.g. send https message)
4. stop capturing
5. in wireshark: "edit -> preferences -> protocols -> TLS -> (pre)-master-secret log filename" select the keylog file from 1.

Then the messages are decrypted by Wireshark.