trackPadButton: (data[7] & 2) !== 0
psButton: (data[7] & 1) !== 0

trackPadTouch0Id: data[35] & 127,
trackPadTouch0Active: (data[35] >> 7) === 0,

Ah, many thanks for the track/ps button find, was going to dig through the other values at the bit level next.

Here's my current complete nodejs Buffer -> Object mapping code:

{
    leftAnalogX: buf[1],
    leftAnalogY: buf[2],
    rightAnalogX: buf[3],
    rightAnalogY: buf[4],
    l2Analog: buf[8],
    r2Analog: buf[9],

    dPadUp: buf[5] === 0 || buf[5] === 1 || buf [5] === 7,
    dPadRight: buf[5] === 1 || buf[5] === 2 || buf [5] === 3,
    dPadDown: buf[5] === 3 || buf[5] === 4 || buf [5] === 5,
    dPadLeft: buf[5] === 5 || buf[5] === 6 || buf [5] === 7,

    x: (buf[5] & 32) !== 0,
    cricle: (buf[5] & 64) !== 0,
    square: (buf[5] & 16) !== 0,
    triangle: (buf[5] & 128) !== 0,

    l1: (buf[6] & 0x01) !== 0,
    l2: (buf[6] & 0x04) !== 0,
    r1: (buf[6] & 0x02) !== 0,
    r2: (buf[6] & 0x08) !== 0,
    l3: (buf[6] & 0x40) !== 0,
    r3: (buf[6] & 0x80) !== 0,

    share: (buf[6] & 0x10) !== 0,
    options: (buf[6] & 0x20) !== 0,
    trackPadButton: (buf[7] & 2) !== 0,
    psButton: (buf[7] & 1) !== 0,

    //// usb only, doesn't work via bluetooth
    //// GYRO
    // TODO
    //// TRACKPAD
    trackPadTouch0Id: buf[35] & 0x7f,
    trackPadTouch0Active: (buf[35] >> 7) === 0,
    trackPadTouch0X: ((buf[37] & 0x0f) << 8) | buf[36],
    trackPadTouch0Y: buf[38] << 4 | ((buf[37] & 0xf0) >> 4),

    trackPadTouch1Id: buf[39] & 0x7f,
    trackPadTouch1Active: (buf[39] >> 7) === 0,
    trackPadTouch1X: ((buf[41] & 0x0f) << 8) | buf[40],
    trackPadTouch1Y: buf[42] << 4 | ((buf[41] & 0xf0) >> 4),

    timestamp: buf[7] >> 2,
    battery: buf[12],
    batteryShort1: buf[12] & 0x0f,
    batteryShort2: buf[12] & 0xf0,
  }

Noticed psdevwiki has barebones info, so linked to here from http://www.psdevwiki.com/ps4/Talk:DualShock_4

A dev with access to USB passthrough has got rumble and LEDs working ‐ http://www.youtube.com/watch?v=RkbjUj5nN6g but afaik wont be sharing the protocol :<

Have been messing locally with sending packets to the controller to trigger rumble, but it doesn’t appear to use anything like PS3s rumble/LED packet.