Add support for DIN

server.js

@@ -1,8 +1,17 @@
-const express = require('express')
-const app = express()
+const express = require('express');
+const app = express();
+
+const DOUT_LUT = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'];
+
+const server = app.listen(3000, function () {
+    console.log('Example app listening on port 3000!');
+})
+
+const io = require('socket.io').listen(server);
 
 var ioState = {
-    dout: [false],
+    dout: [false, false, false, false],
+    din: [false, false, false, false]
 }
 
 const updateState = data => {
@@ -14,15 +23,21 @@ const updateState = data => {
 
 app.use('/', express.static('dist'))
 
-app.get('/api/dout/:pin', function (req, res) {
-  res.send(ioState.dout[req.params.pin])
-})
+app.get('/api/dio/:data', function (req, res) {
+    const doutNum = ioState.dout.reduce((total, x, i) => x ? total + Math.pow(2, i) : total, 0);
+    const doutChar = DOUT_LUT[doutNum];
+    res.send(doutChar);
 
-const server = app.listen(3000, function () {
-  console.log('Example app listening on port 3000!')
-})
+    const dinChar = req.params.data || '0';
+    const dinArray = parseInt(dinChar, 16).toString(2).split('').reverse();
+    const din = new Array(4).fill(false).map((x, i) => dinArray[i] != '1').reverse();
 
-const io = require('socket.io').listen(server);
+    if (ioState.din.toString() != din.toString()) {
+        ioState.din = din;
+        io.emit('ioState', ioState);
+        console.log(din);
+    }
+})
 
 io.on('connection', socket => {
     socket.emit('ioState', ioState);