setmainfont{Roboto}[
  Path = fonts/Roboto/,
  Extension = .ttf,
  %-- Upright --%
  FontFace={ul}{n}{Font=*-Thin},
  FontFace={l}{n}{Font=*-Light},
  FontFace={m}{n}{Font=*-Regular},
  FontFace={mb}{n}{Font=*-Medium},
  FontFace={b}{n}{Font=*-Bold},
  FontFace={eb}{n}{Font=*-Black},
  % %-- Italic --%
  FontFace={ul}{it}{Font=*-ThinItalic},
  FontFace={l}{it}{Font=*-LightItalic},
  FontFace={m}{it}{Font=*-Italic},
  FontFace={mb}{it}{Font=*-MediumItalic},
  FontFace={b}{it}{Font=*-BoldItalic},
  FontFace={eb}{it}{Font=*-BlackItalic},
]

documentclass[10pt]{article}

usepackage{fontspec}

setmainfont{Roboto}[
  Path = fonts/Roboto/,
  Extension = .ttf,
  UprightFont = *-Regular,
  %-- Upright --%
  FontFace={ul}{n}{Font=*-Thin},
  FontFace={l}{n}{Font=*-Light},
  FontFace={m}{n}{Font=*-Regular},
  FontFace={mb}{n}{Font=*-Medium},
  FontFace={b}{n}{Font=*-Bold},
  FontFace={eb}{n}{Font=*-Black},
  % %-- Italic --%
  FontFace={ul}{it}{Font=*-ThinItalic},
  FontFace={l}{it}{Font=*-LightItalic},
  FontFace={m}{it}{Font=*-Italic},
  FontFace={mb}{it}{Font=*-MediumItalic},
  FontFace={b}{it}{Font=*-BoldItalic},
  FontFace={eb}{it}{Font=*-BlackItalic},
]

DeclareRobustCommand{ulseries}{fontseries{ul}selectfont}
DeclareRobustCommand{lseries}{fontseries{l}selectfont}
DeclareRobustCommand{mseries}{fontseries{m}selectfont}
DeclareRobustCommand{mbseries}{fontseries{mb}selectfont}
DeclareRobustCommand{bseries}{fontseries{b}selectfont}
DeclareRobustCommand{ebseries}{fontseries{eb}selectfont}
DeclareTextFontCommand{textul}{ulseries}
DeclareTextFontCommand{textl}{lseries}
DeclareTextFontCommand{textm}{mseries}
DeclareTextFontCommand{textmb}{mbseries}
DeclareTextFontCommand{textb}{bseries}
DeclareTextFontCommand{texteb}{ebseries}

begin{document}

sffamily
textul{Abc Thin} {ulseries Thin}

textl{Abc Light} {lseries Light}

textm{Abc Light} {mseries Light}

Abc Regular

textmb{Abc SemiBold} {mbseries SemiBold}

textb{Abc Bold} {bseries Bold}

texteb{Abc ExtraBold} {ebseries ExtraBold}

end{document}