#5
function reset()
  port.d = false
  port.c = false
  port.a = false

  interrupt(0.01, "play")
end

function play()
  t = mem.msg
  if(t ~= nil) then
     for i=1, #t do
       if(t[i] == 65) then
            port.d = not port.d
       elseif(t[i] == 66) then
            port.c = not port.c
       elseif(t[i] == 67) then
            port.a = not port.a
       end
     end
  end
  mem.msg = {}
end

if(event.type == "digiline" and event.channel == "ch_ABC") then
  mem.msg = event.msg
  reset()
elseif(event.iid == "play") then
  play()
end