While playing with py mods (coal, fusion, industry, petroleum and raw ores) I set requester depot to iron gear wheel (I see correct image) and get small parts (drones delivers them and I can see recipe name while hovering over iron gear image).
Btw, there's a bug with using transport depot reader with a fluid depot. Once depot goes down to zero, reader stops updating and outputs old (greater than zero) value. Once depot get some fluid it works again.
