RSSI Reading

RSSI (Received Signal Strength Indicator) is a value that can be retrieved to guess how far a particular device is from the central. It is possible to retrieve this value by calling:

device.readRSSI(transactionId: ?TransactionId): Promise<Device>

or

bleManager.readRSSIForDevice(
  deviceIdentifier: DeviceId,
  transactionId: ?TransactionId
): Promise<Device>

• deviceIdentifier: DeviceId—is obtained from device.id
• transactionId: TransactionId—optional TransactionId which can be used in bleManager.cancelTransaction() function

The promise resolves when an updated RSSI value is available in device.rssi

Note:

• RSSI value is not precise at any measure. The readings will drift depending on many factors like:
  • Medium quality (humidity, etc.) or obstacles that are in between
  • Mutual position of central/peripheral—most devices have antennas that are directional and depending on the direction the reading may drift