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Update index.js - Xiaomi battery voltage #11

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Update index.js - Xiaomi battery voltage #11

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42 changes: 41 additions & 1 deletion index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,37 @@ var shepherd = new ZShepherd('/dev/ttyACM0', {
}
});

function toUTF8Array(str) {
var utf8 = [];
for (var i=0; i < str.length; i++) {
var charcode = str.charCodeAt(i);
if (charcode < 0x80) utf8.push(charcode);
else if (charcode < 0x800) {
utf8.push(0xc0 | (charcode >> 6),
0x80 | (charcode & 0x3f));
}
else if (charcode < 0xd800 || charcode >= 0xe000) {
utf8.push(0xe0 | (charcode >> 12),
0x80 | ((charcode>>6) & 0x3f),
0x80 | (charcode & 0x3f));
}
// surrogate pair
else {
i++;
// UTF-16 encodes 0x10000-0x10FFFF by
// subtracting 0x10000 and splitting the
// 20 bits of 0x0-0xFFFFF into two halves
charcode = 0x10000 + (((charcode & 0x3ff)<<10)
| (str.charCodeAt(i) & 0x3ff));
utf8.push(0xf0 | (charcode >>18),
0x80 | ((charcode>>12) & 0x3f),
0x80 | ((charcode>>6) & 0x3f),
0x80 | (charcode & 0x3f));
}
}
return utf8;
}

shepherd.on('ready', function() {
console.log('Server is ready. Current devices:');
shepherd.list().forEach(function(dev){
Expand Down Expand Up @@ -46,6 +77,15 @@ shepherd.on('ind', function(msg) {
pl=1;

switch (msg.data.cid) {
case 'genBasic': //Basic device information
if(typeof msg.data.data[65281] !== 'undefined') { // decode Xiaomi device string for battery information
var battStr = toUTF8Array(msg.data.data[65281]);
var voltage = (battStr[5] << 8) + battStr[4];
topic += '/battery';
pl = voltage / 1000.0;
console.log ('Voltage '+ pl);
}
break;
case 'genOnOff': // various switches
topic += '/' + msg.endpoints[0].epId;
pl = msg.data.data['onOff'];
Expand Down Expand Up @@ -109,4 +149,4 @@ client.on('connect', function() {
shepherd.start(function(err) { // start the server
if (err)
console.log(err);
});
});