How to test BLE Power Profiling Example with "nRF Connect"

[garypty]

I am studying this tutorial: nRF52 Online Power Profiler . I know this tutorial basically related to the ble_app_pwr_profiling example in the SDK: Power Profiling Application . Therefore I follow the example and test it with the nRF51 DK board.

It said I can use the Master Control Panel to "Observe notifications" received. However as I do not have the dongle, I tested to use the mobile app "nRF Connect" instead. I can use the mobile app to scan and connect to the DK board successfully. However I do not know how to test the notification correctly.

In the mobile app, after connected to the DK board, I can click an icon with "multiple downward arrow", then I found that I received multiple notifcations with about 20ms interval. Then I change the APP_CFG_CONNECTION_INTERVAL in the example code from 20ms to 200ms, hoping that I will receive notification with about 200ms interval, however I found that the notification interval is still 20ms.

Thank you

[Petter Myhre]

What SDK and SoftDevice version are you using?

[garypty]

The SDK version is 12.1.0. Now I used the Master Control Panel and the dongle to test. I found that the real connection interval is equal to the setting of the Master Control Panel. Also, I have just changed the APP_CFG_CONNECTION_INTERVAL to 200ms, then the mobile app "nRF Connect" cannot connect to the DK board (but the Master Control Panel can connect to the DK), I got: Error 133(0x85): GATT ERROR

[Petter Myhre]

I don't understand why you suddenly get that error. Can you try to do "Refresh device cache" in nRF Connect for Android? What happens if you set APP_CFG_CONNECTION_INTERVAL to 200 ms in Master Control Panel for PC?

[garypty]

I found the error is because the firmware in the dongle is corrupted. I do not know why I need to program the dongle again after almost everytime I plug it out from the PC. I cannot set APP_CFG_CONNECTION_INTERVAL for the Master Control Panel because it is the PC software, but I can set the connection interval in the option of Master Control Panel. If I set it to 200ms, the notification I received from the DK board is 200ms. If I set it to 600ms, then the notification received is in 600ms interval, no matter what I set the APP_CFG_CONNECTION_INTERVAL in the DK board's software.

[Petter Myhre]

Strange. Never heard about that before. I meant: What happens in Master Control Panel for PC if you set APP_CFG_CONNECTION_INTERVAL to 200 ms in the application?