OCaml works great for systems programming (its runtime is orders of magnitude simpler than F# and the CLR). See http://openmirage.org http://openmirage.org for

OCaml works great for systems programming (its runtime is orders of magnitude simpler than F# and the CLR). See http://openmirage.org http://openmirage.org for a bunch of libraries that may be of use to you, such as TCP/IP in OCaml (or https://github.com/mirage https://github.com/mirage)