Proximity connection unstable with Android App

[Dragon Lai]

Hi All,

We tried to modify the Android source core of nRFTools for our Proximity application . And we used some nRF52832 and nRF52840 as the proximity device.

1) We connected devices ( proximity an Android phone). The connection seems unstable such as will disconnect sometime.

2) We modified the connect parameter on the Android side such as shouldAutoConnect() to true. The connection seems more stable, but it will also disconnect and re-connect sometime.

Best Regards,

Dragon

[Amanda Hsieh]

Hi, 

1. What Softdevice version are you using?
2. What phone are you using and what OS does it run?
3. Can you provide some sniffer traces? You can use a development kit and our sniffer solution if you don't have professional equipment.
4. Could you provide the logs on both sides?
5. What is the disconnected reason in the debug log? You could add the code in the case BSP_EVENT_DISCONNECT. 
   

           case BLE_GAP_EVT_DISCONNECTED:
               NRF_LOG_INFO("Disconnected, reason %d.",
                             p_ble_evt->evt.gap_evt.params.disconnected.reason);
               m_conn_handle = BLE_CONN_HANDLE_INVALID;
               break;

-Amanda H.

[Dragon Lai]

hi Amanda H.

Thanks for your reply!

1) For the nrf52832.  We are using the example from  nRF5_sdk_16.0.0_98a08e2 , the Softdevice should be s132_nrf52_7.0.1.

2) The Phone is sony xperia xz premium (sony GB142) and android 9 .

3 and 4 we will try later.

5.) the Log show reason is 8.

Dragon Lai

[Amanda Hsieh]

Hi Dragon, 

Thanks for the info., but still need the logs to know the detail.

-Amanda H.

[Dragon Lai]

Hi Amanda,

We tried to use the kit PCA10040 as the sniffer. We don't know how to get the log when the devices were connected. It seems need the passkey / odd keys. But we have not idea to show the current passkey/odd keys even on proximity device or android app.

Best Regards,

Dragon

[Amanda Hsieh]

Hi Dragon, 

Please see Sniffing a connection between paired devices:
Type the 6-digit passkey that is displayed on either the Central or the Peripheral device into the Passkey / OOB key field in Wireshark.

If you are having issues with this, they could perhaps try to disable security and pairing/bonding while sniffing and debugging this.

-Amanda H.