I am looking for a special kind of VPN connection.
What I would like is a kind of middleware between an app and the network interface that simply encrypts the message and send it through the internet to a specific server that receives it and decrypts it.
What makes this kind of special is that I am trying to avoid a keep-alive on the connection, since that drains battery, and I am also trying to avoid the authentication process, because that also drains battery and the secret to the encryption can be handle in other ways.
In other words I try to get the message encrypted automatically and then transmit that over an unencrypted connection.
Any ideas to apps that can do this?