I've been testing it for hours, I need more than "Doesn't work" ^^
Also, the slowness is impossible to circumvent. Concrete isn't exactly the most yielding element, and if I used something faster than pipe to move the paste it'd turn solid in the passages.
I flick the switch it beeps (Metaphorically speaking) and it just keeps beeping (again, metaphorically) I believe it isn't detecting the signal from the WIFI, make sure they have the same frequency. As for speed just widen up the entry area for paste, or better widen the pipe slightly.
If I widen the area then it can't make paste fast enough to keep up, you see. I tried that. Then the pipe ended up carrying 99% water, which failed.
Also that's a bug with metal and spark and Wifi timing. I'm afraid there's no simple way around that short of making the buttons smaller. Regardless, so long as the button keeps blinking the switch will remain on, so it isn't an issue.