As far as I know that version should work.
@kacf any thoughts here?
Just checked and I should be using v0.3 there was an old 0.2 version in one of our layers which was being used temporarily early on in the project, I’ve check v0.3 and it handles stdin.
I’ve removed the old recipe and I think this will fix things.
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It did indeed work 
I wonder if there is a way of putting a dependency on libubootenv >= 0.3 in Yocto?
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the RDEPENDS variable is probably what you are after as it supports version restrictions
assuming you have a layer that provides 0.3 or above of libubootenv