It looks like you're new here. If you want to get involved, click one of these buttons!
// Set INFY (408065) to 'full' mode to
// receive market depth as well.
message = { a: "mode", v: ["full", [408065]] };
ws.send(JSON.stringify(message));
I get the following response 
{
  type: 'Buffer',
  data: [
      0,   1,   0, 184,   0,  13, 128,   1, 0,  0, 242, 238,
      0,   0,   0,  15,   0,   0, 243, 118, 0, 45,  11, 111,
      0,   9,  92,  18,   0,  17, 106,  16, 0,  0, 243,  92,
      0,   0, 244, 136,   0,   0, 242, 113, 0,  0, 242, 113,
    100, 176, 232, 229,   0,   0,   0,   0, 0,  0,   0,   0,
      0,   0,   0,   0, 100, 176, 232, 231, 0,  0,   8,  14,
      0,   0, 242, 218,   0,  17,   0,   0, 0,  0,   9, 148,
      0,   0, 242, 213,   0,  12,   0,   0, 0,  0,  13, 125,
      0,   0, 242, 208,
    ... 88 more items
  ]
}
The response contains type buffer and Data that is array of integers with 188 length