DynPhy has no features set by default.
[dependencies] dyn_phy = { version = "0.1.0-alpha3", features = ["std"] }
Enables std of smoltcp
Affects ext::DynPhyExt.send_now, ext::DynPhyExt.receive_now…
ext::DynPhyExt.send_now
ext::DynPhyExt.receive_now