Gists for the Shelf Life blog post

button.agent.nut

// Screen Change Agent Code:

local day = true

function changeday(data){
	if (day) day = false;
	else day = true;
}

device.on("changeday, changeday)

function httphandler(request, response) {
	if (day) {
		response.send(200,"day" )
  } else {
  	response.send(200,"night" )
	}
}

http.onrequest(httphandler)

button.device.nut

// Screen Change Device Code:

button <- hardware.pin1;
 
function buttonPress() {
  local state = button.read();
  if (state == 1) {
    server.log("Press");
  } 
  else {
    server.log("Release");
    agent.send("changeday", true);
  }
}

button.configure(DIGITAL_IN_PULLUP, buttonPress);

keypad.agent.nut

// Keypad Agent Code:

local lastdatereceived=""
local lastindex=0

function gotnewdate(thedate){
	server.log (thedate)
	lastdatereceived=thedate
	lastindex=lastindex+1
}

device.on("newdate",gotnewdate)

function httphandler(request,response){
	response.send(200,"index"+lastindex+ "date"+lastdatereceived )
}

http.onrequest(httphandler)

keypad.device.nut

// Keypad Device Code:

hardware.pin1.configure(DIGITAL_OUT,0)
hardware.pin2.configure(DIGITAL_OUT,0)
hardware.pin5.configure(DIGITAL_OUT,0)
hardware.pin7.configure(DIGITAL_IN)
hardware.pin8.configure(DIGITAL_IN)
hardware.pin9.configure(DIGITAL_IN)

local thedate=""

function scanrows(){
  if(hardware.pin7.read()==1)return 1
  if(hardware.pin8.read()==1)return 4
  if(hardware.pin9.read()==1)return 7

	return 0
}

function scancolumb1(){
	hardware.pin1.write(1)
	local row=scanrows()
	hardware.pin1.write(0)
	
	return row
}

function scancolumb2(){
	hardware.pin2.write(1)
	local row=scanrows()
	hardware.pin2.write(0)

	return row
}

function scancolumb3(){
	hardware.pin5.write(1)
	local row=scanrows()
	hardware.pin5.write(0)
	
	return row
}

function scankeypad(){
  local columb1=scancolumb1() 
  local columb2=scancolumb2() 
  
  if(columb2>0)columb2=columb2+1
  
  local columb3=scancolumb3() 
  if(columb3>0)columb3=columb3+2
   
  local key=columb1+columb2+columb3
  if(key!=0){
	  server.log("detected key press"+key)
	  thedate=thedate+key
	  if(thedate.len()==6){
      agent.send("newdate",thedate)
      thedate=""
	  }
  }
  
  imp.wakeup(0.25,scankeypad)
} scankeypad()