netopeer2: Callhome Failed to set hostkey "genkey"

I try to test a callhome procedure but met a ssh problem. version: sysrepo 1.4.58 netopeer2 1.1.27 libssh 0.9.2 (from /usr/local/include/libssh/libssh.h) In fact,I really think the merge_hostkey.sh should be executed during installation because I can saw the running data of ietf-keystore after installation. But I can not find the genkey file in my system by find / -name genkey*.So I generated the key pair by myself,use the ssh-keygen command: ssh-keygen -t rsa -b 2048 -N ‘’ -C “cpesn” -f genkey -q The key pair was copied into /etc/ssh. After this,I modifed the ssh_callhome.xml, pasted the private key and public key into hostkey_config.xml,some of the details are as follows: ssh_callhome.xml

                        <ssh-server-parameters>
                            <server-identity>
                                <host-key>
                                    <name>genkey</name>
                                    <public-key>
                                        <keystore-reference>genkey</keystore-reference>
                                    </public-key>
                                </host-key>
                            </server-identity>
                            <client-authentication>
                                <supported-authentication-methods>
                                    <publickey/>
                                    <passsword/>
                                    <other>interactive</other>
                                </supported-authentication-methods>
                                <users/>
                            </client-authentication>
                        </ssh-server-parameters>

hostkey_config.xml

<keystore xmlns="urn:ietf:params:xml:ns:yang:ietf-keystore">
  <asymmetric-keys>
    <asymmetric-key>
      <name>genkey</name>
      <algorithm>rsa2048</algorithm>
      <public-key>Don't show details</public-key>
      <private-key>Don't show details</private-key>
    </asymmetric-key>
  </asymmetric-keys>
</keystore>

Re-run sysrepo-plugind and netopeer2-server, it went to callhome procedure but Failed to set hostkey,the output as follows:

[INF]: LN: Call Home client "rohc" connecting...
[INF]: LN: Trying to connect via IPv4 to 192.168.1.21:6666.
[INF]: LN: Successfully connected to 192.168.1.21:6666 over IPv4.
[INF]: SR: Session 21 (user "root") created.
[ERR]: LN: Failed to set hostkey "genkey" (/tmp/snSMmf).
[INF]: LN: Trying to connect via IPv4 to 192.168.1.21:6666.
[INF]: LN: Successfully connected to 192.168.1.21:6666 over IPv4.
[INF]: SR: Session 22 (user "root") created.
[ERR]: LN: Failed to set hostkey "genkey" (/tmp/c3gZRq).
[INF]: LN: Trying to connect via IPv4 to 192.168.1.21:6666.
[INF]: LN: Successfully connected to 192.168.1.21:6666 over IPv4.
[INF]: SR: Session 23 (user "root") created.
[ERR]: LN: Failed to set hostkey "genkey" (/tmp/LeTyHF).

I’m confused about the error path /tmp/***,why is not /root/.ssh or /etc/ssh or /usr/local/etc/keystored/keys/?Which one should be the correct one? Is my step wrong?Any help would be appreciated!