out

<Buffer 6c 69 62 70 65 62 62 6c 65>
<Buffer 00 09 6c 69 62 70 65 62 62 6c 65>

Data 0: 0 0
Data 1:	 9 9
Data 2:l 108 6c
Data 3:i 105 69
Data 4:b 98 62
Data 5:p 112 70
Data 6:e 101 65
Data 7:b 98 62
Data 8:b 98 62
Data 9:l 108 6c
Data 10:e 101 65

serial.js

var sender = "libpebble";
var subject = "Hello, Pebble!";
var body = "I hate you.";

var buffer = new Buffer(sender.length + 1 + 1);


buffer[0] =  0x00;
buffer[1] = sender.length;
var bTemp = new Buffer(sender);
console.log(bTemp);
bTemp.copy(buffer,2);

console.log(buffer);