读取数据点
读取 API 由各通信 capability 提供。传入 undefined 读取全部数据点，传入名称数组只读取指定数据点。
通过 BLE 读取
const allBleData = await device.bleCapability.readDataPoints(device, undefined);
const selectedBleData = await device.bleCapability.readDataPoints(device, ['power']);调用前应完成 BLE 连接与鉴权。
通过 LAN 读取
const allLanData = await device.lanCapability.readDataPoints(device, undefined);
const selectedLanData = await device.lanCapability.readDataPoints(
device,
['power', 'temperature']
);通过 MQTT 读取
const allCloudData = await device.mqttCapability.readDataPoints(device, undefined);
const selectedCloudData = await GizMqttManager.readDeviceDataPoints(device, ['power']);同一设备同时只能有一个等待响应的 MQTT 读取命令。
返回结果
三个通道都返回 GizDataPointEvent。其中 data、alerts、faults 分别保存普通数据、告警和故障，binary 是原始二进制数据，source 表示来源通道。持续接收设备上报时，请使用 事件监听。