Hi Vitaliy,
You can have a look at this forum thread: Rsync over balena ssh tunnel? on how you can make scp work. Another option is to add your certificate as an environment variable from the dashboard or the CLI, and use that from your service. We do intend to support something like balena scp but I cannot give you any ETA on that. I am not sure about your setup, but there is also the possibility of having a centralized service that stores the ceritficates, and the devices can have an API key set from an environment variable that will be used to authenticate with that service when doing curl, for example. Once we have scp support we’ll let you know.