my.onBLECharacteristicValueChange

my.onBLECharacteristicValueChange({
  success: (res) => {
    console.log('Device:', res.deviceId);
    console.log('Characteristic:', res.characteristicId);
    console.log('Value:', res.value);
  }
});

Page({
  onLoad() {
    my.onBLECharacteristicValueChange({
      success: this.handleValueChange
    });
  },

  handleValueChange(res) {
    console.log('Received hex value:', res.value);
    this.setData({ latestValue: res.value });
  },

  readValue() {
    my.readBLECharacteristicValue({
      deviceId: this.data.deviceId,
      serviceId: this.data.serviceId,
      characteristicId: this.data.characteristicId,
    });
  },

  onUnload() {
    my.offBLECharacteristicValueChange();
  }
});

// When characteristic has notify enabled, updates arrive automatically
my.onBLECharacteristicValueChange({
  success: (res) => {
    if (res.characteristicId === '0000FFF1-0000-1000-8000-00805F9B34FB') {
      console.log('Sensor data (hex):', res.value);
    }
  }
});