Create Linestring Between 2 Points
I ended up using Rules to automatically populate a text field with the linestring data LINESTRING(lat lon, lat lon) after every new entity add or existing entity update, with the condition that both geofields (sender and receiver) were filled. Created another geofield to hold the LINESTRING, geocoded from the text linestring field as WKT. Ran VBO to update all existing nodes. Plots well in IPGV&amp;M and should handle itself automatically from now on.