awesomewmrc.lua

local finnapomowidget = wibox.container.background(
   wibox.widget{
      text = '____',
      align  = 'center',
      valign = 'center',
      widget = wibox.widget.textbox
   },
   'green'
)
dbus.add_match(
   "session", "interface='io.github.finna_pomodoro_project.Pomodoro'"
)
dbus.connect_signal(
   "io.github.finna_pomodoro_project.Pomodoro",
   function(data)
      if (data.member == 'pomodoro_paused'
          or data.member == 'work_session_stopped') then
          finnapomowidget.bg = 'green'
      elseif data.member == 'work_session_started' then
          finnapomowidget.bg = 'red'
      end
   end
)