There are two similar questions to mine:
But they both attempt to draw the node using tikz and I want to use a custom image, since I find drawing the shapes too complicated. What I need is to draw a diagram of a network protocol, where some nodes are people, others are (different classes of) network equipment. Assuming I want to use existing figures e.g. from LibreOffice Draw, how can I embed the LibreOffice figures into my tikzpicture?