init.lua

function handle_request(code, data)
   if code < 0 then
      print("failed to post http")
      do_it()
   else
      print("score, sleeping for 1 hour")
      node.dsleep(4294967295, nil)
   end
end

function read_value()
   hx711.init(6, 7)
   return hx711.read()
end

function post_value(value)
   http.post(
      "https://api.thingspeak.com/update.json",
      "",
      string.format("api_key=FOOBAR&field1=%s", value),
      handle_request
   )
end

function do_it()
   value = read_value()
   post_value(value)
end

if not tmr.alarm(0, 15000, tmr.ALARM_SINGLE, do_it) then
   print("failed to set up timer")
else
   print("starting things in 15s")
end