Typo fix (retrasmission --> retransmission)
Typo fix (retrasmission --> retransmission)

Simple typo fixed.
thejdeep/CoAPthon,thejdeep/CoAPthon,Tanganelli/CoAPthon,Gnomjolnir/CoAPthon,mcfreis/CoAPthon,Gnomjolnir/CoAPthon,Tanganelli/CoAPthon