(yeti@aurora:3)/home/tmp$ telnet nodemcu0
Trying ###IP-address###...
Connected to nodemcu0.###domain###.
Escape character is '^]'.
Welcome to NodeMcu world.
stdin:1: unexpected symbol near '
> -- the error does not show when using "nc nodemcu0 23" to connect
> file.open("init.lua") print(file.read()) file.close()
dofile("init-sta.lc")
dofile("telnetd.lc")    -- think big! ;-)
dofile("thingspeak.lc")

> file.open("init-sta.lua") print(file.read()) file.close()
wifi.setmode(wifi.STATION)
wifi.sta.config("###SSID###","#####PASSWORD###")
wifi.sta.connect()  

> file.open("telnetd.lua") print(file.read()) file.close()
s=net.createServer(net.TCP,3600)
s:listen(23,function(c)
    function s_output(str) if(c~=nil)then c:send(str) end end
        node.output(s_output, 0)
        c:on("receive",function(c,l) node.input(l) end)
        c:on("disconnection",function(c) node.output(nil) end)
        print("Welcome to NodeMcu world.")
end)

> file.open("thingspeak.lua") print(file.read()) file.close()
-- 600000 = 10 min
tmr.alarm(0,600000,1,
  function()
    conn=net.createConnection(net.TCP,0)
    conn:on("receive",function(conn,str) print(str) end)
    conn:connect(80,'184.106.153.149') -- api.thingspeak.com
    conn:send(string.format("GET /update?key=###ThingSpeakKey###&field1=%d&field2=%d&field3=%d&field4=%d&ignore=%d HTTP/1.1\r\nHost: api.thingspeak.com\r\nAccept: */*\r\n\r\n",tmr.now(),node.heap(),file.fsinfo()))
    conn:on("sent",function(conn) print("Closing connection") conn:close() end)
    conn:on("disconnection",function(conn) print("Got disconnection...") end)
  end
)

> _