How to retrieve Bluetooth RSSI (signal strength) after connecting

pvaibhav

Hello all, I'm using the QT 5.5 Bluetooth Low Energy API to write an app for iOS (and later Android).

I couldn't find any way to read the rssi/signal level once the device is already connected.

During scan, the onDeviceDiscovered() signal passes a QBluetoothDeviceInfo object which has a rssi() function to return the signal level when the device was last scanned. This works fine initially, but always returns 0 outside of the slot.

So my question: What would be the correct way to update the signal strength after connecting to a device? Is it currently implemented?

michaelL

@pvaibhav Could you get it to work?
I want also to read RSSI while connected.

ekkescorner

that's easy: http://doc.qt.io/qt-5/qbluetoothdeviceinfo.html#rssi

michaelL

@ekkescorner
qint16 QBluetoothDeviceInfo::rssi() const

Returns the signal strength when the device was last scanned

Yes i use this function already, but i want to get RSSI values while connected and not from scanning.
This function gives me the RSSI value once the device is scanned. When i stablish connection with the device and move around this value doesnt change.
So is there any way of getting RSSI value in connection?

ekkescorner

@michaelL AFAIK only Beacons provide this feature. But at the moment I have no idea HowTo listen at Beacons - have only connected to non-Beacon_BT LE devices

Pham Hoang

any updates on this? almost 5 years, but seem it still hot. ^^!
i found a ticket : https://bugreports.qt.io/browse/QTBUG-69747