wx.getBLEDeviceCharacteristics({ deviceId, serviceId, success: (res) => { console.log('getBLEDeviceCharacteristics success', res.characteristics) for (let i = 0; i < res.characteristics.length; i++) { let item = res.characteristics[i] if (item.properties.read) { wx.readBLECharacteristicValue({ deviceId, serviceId, characteristicId: item.uuid, }) } if (item.properties.write) { this.canWrite = true this._deviceId = deviceId this._serviceId = serviceId this._characteristicId = item.uuid //this.writeBLECharacteristicValue() }