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local wol = {
port = 9,
timer = tmr.create(),
}
--- Reads configuration file at [[path]] and parses a pair of MAC and broadcast addresses from it. Builds a Wake-on-LAN
--- magic packet and saves it for later use with :worker(). Returns true if no errors were encountered, otherwise a nil.
function wol:configure (path)
local fd = file.open(path)
if not fd then
print("Config file not found", path)
return
end
local line = fd:readline()
fd:close()
fd = nil
self.mac, self.addr = line:match("^(%S+)%s+(%S+)")
self.data = ""
for octet in self.mac:gmatch("%x%x") do
self.data = self.data .. string.char(tonumber(octet, 16))
end
if #self.data ~= 6 then
print(string.format("Invalid MAC\t%q", self.mac))
return
end
self.data = string.char(0xff):rep(6) .. self.data:rep(16)
return true
end
--- Initializes and returns worker that implements :sendout(interval, times, callback) that attempts to wake up
--- designated host number of [[times]] each separated by [[interval]]. After all attempts [[callback]] is called.
function wol:worker ()
return {
config = self,
udp = net.createUDPSocket(),
timer = tmr.create(),
count = 0,
sendout = function (self, interval, times, cb)
self.times = times
return self.timer:alarm(interval, tmr.ALARM_SEMI, function (timer)
self.count = self.count + 1
if self.count <= self.times then
print("Waking up", self.config.mac, self.config.addr)
self.udp:send(self.config.port, self.config.addr, self.config.data)
timer:start()
else
timer:unregister()
cb()
end
end)
end,
}
end
wol.timer:register(1000, tmr.ALARM_SINGLE, function ()
gpio.mode(4, gpio.OUTPUT)
gpio.write(4, gpio.HIGH)
if not wol:configure("wakeup.conf") then
error("Could not configure wakeup")
end
wifi.setmode(wifi.STATION, false)
wifi.eventmon.register(wifi.eventmon.STA_GOT_IP, function ()
local waker = wol:worker()
gpio.write(4, gpio.LOW)
waker:sendout(500, 5, function ()
wifi.setmode(wifi.NULLMODE, false)
gpio.write(4, gpio.HIGH)
end)
end)
wifi.sta.connect()
end)
return function ()
wol.timer:start()
end
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