BLE TI SensorTag CC2650 - Printable Version

Code:
return {
  manufacturer = 'TI',
  description = 'SensorTag',
  default_name = 'SensorTag',
  version = 2,
  objects = {
    {
      id = 'temp',
      name = 'Temperature',
      datatype = dt.temperature
    },
    {
      id = 'hum',
      name = 'Humidity',
      datatype = dt.scale
    },
    {
      id = 'button1',
      name = 'Button 1',
      datatype = dt.switch
    },
    {
      id = 'button2',
      name = 'Button 2',
      datatype = dt.switch
    }
  },
  init = function(device)
    local objects = device.objects

    if not objects.button1 and not objects.button2 then
      device.profile.step = nil
    end

    if not objects.temp and not objects.hum then
      device.profile.read = nil
    end
  end,
  setbutton = function(device, button, value)
    local key = 'button' .. button

    if device[ key ] ~= value then
      device.writeobject(key, value)
      device[ key ] = value
    end
  end,
  step = function(device)
    local sock, res, data, err, setbutton

    sock = device.sock
    setbutton = device.profile.setbutton

    if not sock then
      sock = ble.sock()
      ble.settimeout(sock, 1)

      -- try connecting
      res = ble.connect(sock, device.mac)
      if not res then
        ble.close(sock)
        device.setactive(false)
        os.sleep(5)
        return
      end

      -- enable button notification
      ble.sockwritecmd(sock, 0x60, 1, 0)
      device.sock = sock

      setbutton(device, 1, false)
      setbutton(device, 2, false)
    end

    res, data = ble.sockreadnotify(sock, 1)
    -- read ok
    if res then
      data = data:byte(1)

      setbutton(device, 1, bit.band(data, 1) == 1)
      setbutton(device, 2, bit.band(data, 2) == 2)

      device.setactive(true)
    -- timeout or disconnect
    else
      res, err = ble.check(sock)

      -- disconnect
      if not res or err ~= 0 then
        ble.close(sock)
        device.sock = nil
      end
    end
  end,
  read = function(device)
    local sock, res, status, values, rssi

    if device.profile.step then
      sock = device.sock
      res = sock
    else
      sock = ble.sock()
      ble.settimeout(sock, 1)
      res = ble.connect(sock, device.mac)
    end

    -- connect ok, enable sensor, wait for conversion to finish, read the result
    if res then
      ble.sockwritecmd(sock, 0x3C, 1)
      os.sleep(0.1)
      res = ble.sockreadhnd(sock, 0x38)

      -- read ok
      if res then
        status = true
        values = {}

        rssi = ble.getrssi(device.mac)

        -- convert temperature
        tmp = bit.bor(bit.lshift(res:byte(2), 8), res:byte(1))
        tmp = -46.85 + 175.72 / 65536 * tmp;
        values.temp = math.floor(tmp * 10) / 10

        -- convert humidity
        tmp = bit.bor(bit.lshift(res:byte(4), 8), res:byte(3))
        tmp = -6.0 + 125.0 / 65536 * bit.band(tmp, 0xFFFC)
        values.hum = math.floor(tmp + 0.5)
      end

      -- disable sensor
      ble.sockwritecmd(sock, 0x3C, 0)
    end

    if not device.profile.step then
      ble.close(sock)
    end

    return status, values, rssi
  end
}