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local wakeup = require("+wakeup")
--- Builds and returns a Wake-on-LAN magic packet for [[mac]] address.
local
function magic_packet (mac)
local data = ""
for octet in mac:gmatch("%x%x") do
data = data .. string.char(tonumber(octet, 16))
end
if #data ~= 6 then
error(string.format("Invalid MAC\t%q", mac), 2)
end
return string.char(0xff):rep(6) .. data:rep(16)
end
--- Creates a new counter that has :up() method that returns true until it gets called N [[times]]. Then it returns only
--- false.
local
function new_counter (times)
return {
count = 0,
times = times,
up = function (self)
self.count = self.count + 1
return self.count <= self.times
end,
}
end
--- Perform the most basic preparations right after device booted up.
function wakeup:boot ()
gpio.write(4, gpio.HIGH)
gpio.mode(4, gpio.OUTPUT)
self.data = magic_packet(self.mac)
self.step = self.connect
end
--- This is the current state action of the wake-up state machine. It is a callable that has [[(self, [timer]) -> nil]]
--- signature. Steps are called sequentially, usually by a tmr.timer.
wakeup.step = wakeup.boot
--- Will tick for N [[ticks]] and then switch into a state [[after]].
local
function start_timeout (ticks, after)
local self = new_counter(ticks)
return function (wakeup)
if not self:up() then
wakeup.step = after
end
end
end
--- Marks a failure that is pointless to attempt to recover from, e.g., if provided configuration is incomplete.
function wakeup:hard_failure (timer)
print("Aborting...")
return timer:unregister()
end
--- Marks a failure that device may recover from by restarting itself.
function wakeup:soft_failure ()
node.restart()
end
function wakeup:connect ()
self.step = start_timeout(10, self.soft_failure)
wifi.eventmon.register(wifi.eventmon.STA_GOT_IP, function ()
self.step = self.sync_time
end)
wifi.setmode(wifi.STATION, false)
wifi.sta.connect()
end
function wakeup:sync_time ()
self.step = start_timeout(10, self.soft_failure)
sntp.sync(
self.sntp,
function ()
self.step = self.check_time
end,
function (code, err)
print("SNTP sync failed", code, err)
self.step = self.soft_failure
end)
end
--- Creates new state machine action that sends out Wake-on-LAN magic packets to configured host N [[times]].
local
function start_sendout (times)
local self = new_counter(times)
self.udp = net.createUDPSocket()
return function (wakeup, timer)
if self:up() then
print("Waking up", wakeup.mac, wakeup.addr)
self.udp:send(wakeup.port, wakeup.addr, wakeup.data)
else
print("Done")
timer:interval(10000)
self.udp:close()
gpio.write(4, gpio.HIGH)
wakeup.step = start_timeout(6, wakeup.check_time)
end
end
end
--- Current UTC wall clock time.
local
function now ()
local time = rtctime.epoch2cal(rtctime.get())
return {hour = time.hour, min = time.min}
end
--- Time in minutes to next occurrence of [[pattern]] starting from [[time]].
local
function upcoming (pattern, time)
local hours = 0
if pattern.hour then
hours = pattern.hour - time.hour
if hours < 0 then
hours = hours + 24
end
end
local minutes = 0
if pattern.min then
minutes = pattern.min - time.min
if minutes < 0 then
minutes = minutes + 60
if hours > 0 then
hours = hours - 1
end
end
end
return hours * 60 + minutes
end
function wakeup:check_time (timer)
local left = upcoming(self.when, now())
if left == 0 then
timer:interval(500)
gpio.write(4, gpio.LOW)
self.step = start_sendout(5)
elseif left > 5 then
timer:interval(1000)
print(string.format("Need to wait total %d minutes", left))
left = left - 5
if left > 50 then
left = 50
end
self.left = left
self.step = start_timeout(3, self.sleep)
print(string.format("Going to sleep %d minutes", left))
else
timer:interval(30000)
print(string.format("Wake-up in %d minutes", left))
end
end
function wakeup:sleep (timer)
wifi.setmode(wifi.NULLMODE, false)
timer:unregister()
rtctime.dsleep(self.left * 60e6, 1)
end
return wakeup
|
