Hello.
I have problem with rsync on OMV v 4.1.9 and SSHelper for android from https://arachnoid.com/android/SSHelper/index.html available from Google Play
The problem is with SSH certificates.
OMV uses RSA PEM X509 format and SSHelper does not use this format, it uses OpenSSH SSH-2 private key new format.
Option 1)
I create certificate on OMV and copy it to windows machine to convert it using puttygen, then copy it to /data/data/com.arachnoid.sshelper/home/.ssh with id_rsa, OMV gives me error "Host key verification failed."
My settings from OMV are :
Rsync JOB
Type : Remote
Mode : Pull
Source : /xyz/ destination on my phone
Destination Share Folder : share on my OMV
Authentication : Public Key
SSH Port : 2222 (default port on SSHelper)
SSH Certificate : certificate that i made on OMV
Option 2)
When i let SShelper generate the certificates, i can not converte them to a X509 PEM that OMV asks for importing, with OMV giving me error with importing.
I also tried to convert it by all means available using ssh-keygen on linux but with no success 
Can anyone help, this seems the best combination of rsync omv / android that i could find.
Thank you all in advance 