From VDR Wiki
Makes it easy for other local plugins to access an Svdrp server. The VDR service interface is used to access svdrpservice. It offers two service calls: One to open or close an SVDRP connection and the other for sending commands. The server reply is made available as a list of lines. Check the plugin's README for some sample code or look at one of the plugins which already use svdrpservice.
A plugin developer who needs connections to an Svdrp server can save quite a bit of time when using the Svdrpservice-plugin. With Svdrpservice it is even possible to share a single connection among multiple local plugins which is important as long as an Svdrp server cannot handle multiple connections simultaneously.