-- play.lua : realtime transport playback to keep the DSP host's audio callback
-- alive, so an external script can snapshot memory while ctx fields are live.
-- NOTE: reaper.Sleep does not exist in the REAPER API; use reaper.defer loop.
local keep_secs = 300

reaper.Main_OnCommand(1007, 0)  -- Transport: Play (realtime audio)
local t0 = reaper.time_precise()

local function keepalive()
  if reaper.time_precise() - t0 < keep_secs then
    reaper.defer(keepalive)      -- yield; runs on every UI update tick
  else
    reaper.OnStopButton()
  end
end

reaper.defer(keepalive)