scoreboard.lua

wifi.setmode(wifi.STATION)
wifi.sta.config("SSID","password")

-- Send POST when buttons A or B pressed

PIN_BUTTON_A = 3   -- GPIO0
PIN_BUTTON_B = 4   -- GPIO1
TIME_ALARM = 25  -- 0.025 second, 40 Hz

gpio.mode(PIN_BUTTON_A, gpio.INPUT, gpio.PULLUP)
gpio.mode(PIN_BUTTON_B, gpio.INPUT, gpio.PULLUP)

button_state_a = 1
button_state_b = 1
button_time_a  = 0
button_time_b  = 0
undo_triggered_a = 0
undo_triggered_b = 0

--local conn = nil
--conn=net.createConnection(net.TCP, 0)
--conn:connect(80,"23.23.123.101")

function addPoint(button)
  conn=net.createConnection(net.TCP, 0)
  conn:connect(80, "0.0.0.0") -- IP of the hosted app. The library does not do DNS
  conn:send("PUT /" .. button .."_scores HTTP/1.1\r\nHost: app-name.herokuapp.com\r\nConnection: keep-alive\r\nAccept: */*\r\nContent-Length: 0\r\n\r\n", function(sck) sck:close(); end)
end

function undoPoint(button)
  conn=net.createConnection(net.TCP, 0)
  conn:connect(80, "0.0.0.0") -- IP of the hosted app. The library does not do DNS
  conn:send("PUT /" .. button .."_undo HTTP/1.1\r\nHost: app-name.herokuapp.com\r\nConnection: keep-alive\r\nAccept: */*\r\nContent-Length: 0\r\n\r\n", function(sck) sck:close(); end)
end
 
function buttonHandler()
--  button a
  button_state_new_a = gpio.read(PIN_BUTTON_A)
  
  if button_state_a == 1 and button_state_new_a == 0 then -- button down
    button_time_a = tmr.time()
  elseif button_state_a == 0 and button_state_new_a == 1 then -- button up
    if tmr.time() > (button_time_a + 1) then -- button had been down for 1s
      undo_triggered_a = 0
    else -- button had been down for less than 1s
      addPoint('red')
    end
  elseif button_state_new_a == 0 and undo_triggered_a == 0 and tmr.time() > (button_time_a + 1) then
    undoPoint('red')
    undo_triggered_a = 1
  end
  button_state_a = button_state_new_a

--  button b
  button_state_new_b = gpio.read(PIN_BUTTON_B)
  if button_state_b == 1 and button_state_new_b == 0 then -- button down
    button_time_b = tmr.time()
  elseif button_state_b == 0 and button_state_new_b == 1 then -- button up
    if tmr.time() > (button_time_b + 1) then -- button had been down for 1s
      undo_triggered_b = 0
    else -- button had been down for less than 1s
      addPoint('blue')
    end
  elseif button_state_new_b == 0 and undo_triggered_b == 0 and tmr.time() > (button_time_b + 1) then
    undoPoint('blue')
    undo_triggered_b = 1
  end
  button_state_b = button_state_new_b
end

tmr.alarm(1, TIME_ALARM, 1, buttonHandler)