Edit: got user after 3 days of banging my head on the wall, cause it just didn’t wan’t to work like I expected mostly because of lack of experience in binexp
my 2 cents: pop_rdi was just enough.
Kudos to @rewks for:
User: … You may wish to
sed -i 's/follow-fork-mode child/follow-fork-mode parent/g' ~/peda/peda.py(or whever your peda is located)…
Also kudos to @thedoc7or who gave links how to receive stdout/stdin with pwntools. After that everything worked out of the box. IMO This one was harder to understand than Ellingson (which rated hard), but great experience overall 
edit2: rooted