a) a point layer of connection points to an existing network, i.e. an existing network can be accessed here.
b) a point layer of sites that should be connected newly to the existing network
I want to generate the shortest spanning trees to connect the point of layer b) to any of the points of layer a).
With the ReconstructLine plugin I can build the shortest spanning tree between all point of both layers, but this tree is more than I need as it builds a new network between every points. I would need a spanning tree plugin that respects the already existing connections between the points of layer b.