init.lua

proj = "project18a"

-- full init =
--    1 init  
--    2 WIFI
--    3 TIME

-- then your "project" is ready to start
-- short init might skip WIFI/TIME

-- following makes missing file into non-panic:
local df=dofile 
dofile=function(f) 
    if file.exists(f) then 
        df(f) 
    else 
        print("File ", f, "not exist ***\n") 
        ff=file.open("missingfile", "w") ff:writeline(f) ff:close()
        node.restart()
    end 
end
if file.open("missingfile", "r")  then 
    f = file.readline() file.close() file.remove("missingfile")
    print("Please fix missing file", f)
    return -- terminate
end
if file.open("runonce", "r")  then 
    f = file.readline():gsub('\n','') file.close() file.remove("runonce")
    dofile(f)
    node.restart() 
end

-- refer lib-DEEPSLEEP.lua to understand these numbers
if rtcmem and rtcmem.read32(20) == 123654 then-- test if waking from deepsleep? (either timer or button)
    rtcmem.write32(20,654321) 
    -- if so, destroy that number against re-use, but leave its equivalent for our project to see
    local pass=rtcmem.read32(23)
    local starttype = rtcmem.read32(22)
    if starttype == 1 and pass >0 then  
         node.task.post( function() dofile("init2-WIFI.lua") end ) -- faster than below
         return
    elseif starttype == 2 or (starttype == 3 and pass >0) then 
         node.task.post( function() dofile(proj..".lua") end ) -- skip pause, wifi & sntp
         return
    end
    -- so, waking from deepsleep, but not doing any special fast start
end

-- below, doing regular delayed full start ...

wifi.setmode(wifi.STATION) 
print "Hold down button during blinking to abort..." 
gpio.mode(4,gpio.OUTPUT)   -- the led on ESP12 submodule
gpio.mode(3,gpio.INPUT)  -- make sure D3 button is working, & not left as an output since just before reset
pwm.setup(4,12,950)   -- flash
pwm.start(4)                                                          --   stage #1

tmr.alarm(0, 5000, 0, function()
        -- allow time for wifi to autostart, and time to salvage looping panics
        if rtctime.get() > 10 then print("Awake from Deep Sleep") end
        -- we arrive here after the X mseconds past reset
        -- see https://bigdanzblog.wordpress.com/2015/04/24/esp8266-nodemcu-interrupting-init-lua-during-boot/
        pwm.stop(4)
        pwm.close(4)          -- stop flash
        if gpio.read(3) == 0 then
            print "Button held: Aborted start."
            gpio.write(4,0)        -- turn on
            return  -- EXITS without anything else happening. flashing continues.
        end
        -- if we get here, we didn't press abort button
        gpio.write(4,1)        -- turn led off
        gpio.mode(4,0)         -- restore to regular input mode
        dofile("init2-WIFI.lua")
end)
-- early "stop timer 0" at ESPlorer can abort the init sequence


local rawcode,extcode = node.bootreason()
local rc={"Pwr on","Reset", "HW reset", "WDT reset"}
local ec={"Pwr on", "HW WDT", "Exception Crash", "SW WDT", "SW restart", "Deepsleep Wake", "EXT reset"}
--           0         1            2                3            4           5                 6
print(rc[rawcode], ec[extcode+1])
if extcode == 2 then print (node.bootreason()) end
-- BUT DON'T BELIEVE IT RELIGIOUSLY !!

function clone (t) 
-- clones a romtable (or table) into ram. Member romtables or lightfunctions remain in rom
-- eg   math=clone(math)
    local target = {}
    for k, v in pairs(t) do target[k] = v end
    setmetatable(target, getmetatable(t)) 
    target['parent'] = t
    return target  
end 

-- v 0.8    18 sept 2017     starttype 2 for deepsleep