• バイナリ処理
• JSON
  • オブジェクトからJSONへの変換

msg.payload = new Buffer([0, 1, 2, 3, 4, 5]);
return msg;

let buf = new Buffer([0x12, 0x34,0x56,0x78]);
let x = buf.readUint16BE(0);
let y = buf.readUint16BE(2);
msg.payload = x;
return msg;

let x = 1;
let y = 2;
console.log(JSON.stringify({ x, y }));
console.log(JSON.stringify({ x: 5, y: 6 }));

 '{"x":1,"y":2}'
 '{"x":5,"y":6}'