**UPDATE** Found the reason. The watch will never (in our case) find a scan result from a BLE device which doesn't advertise General Discoverable Mode. However, running your FW on a nRF dongle will get those scan results. I'm not sure the reason why they behave differently. But I guess we can hope that you support getting scan results from devices which doesn't advertise General Discoverable Mode in the future, just like android, iOS, wearOS and watchOS does.
I have an application which starts BLE scanning and then shows the result. It does however work drastically different on a simulator vs an actual watch:
- If I run it on the simulator for Fenix 6X PRO with a nRF plugged into my computer then I see all the desired scan results from devices that are nearby. The app will find almost all the nearby devices and the scan results will properly contain the device name, service UUID etc.
- If I build the app, put it on my Fenix 6X PRO watch and then launch it then it works very intermittently. For some periods of time it doesn't get any scan results. Other periods it will get 1-3 different scan results over and over again, and it's never the result of the desired device.
Our peripheral device advertises regular BLE with a service UUID of 128 bits. The results we see on the watch are only for devices which advertises 16-bit service UUIDS.
Example of results I do get on the watch when doing BLE scanning:
- FE50 (0000FE50-0000-10000-80000-00805F9B34FB) with name Google
- 1523 (00001523-0000-10000-80000-00805F9B34FB) with name TT214H BlueFrog
- FE4D (0000FE4D-0000-10000-80000-00805F9B34FB) with name EBDMR-CB-DD (Casambi)
The names here have been gotten from nRF connect b/c the watch always thinks that the name (scanResult.getDeviceName()) is null.
What can be the reason for the app functioning so differently on a simulator and a similar watch? Why does it only show some scan results?
I have also tried with BleScan on that same watch and it gets the exact same scan results as I get in my app. Why does that watch only get those results?