Disconnecting (0x8) with error when running SDK example

[Watermelon]

Hello,

I'm working with SDK 15.0 and Softdevice S132 6.0. I have two nRF52832 boards (the BMD-300 Evaluation Kit and the SparkFun nRF52832 Breakout).

I am running ble_app_hrs and ble_app_hrs_c on the two boards using the pre-compiled hex files (I've also tried running the code from Keil and the makefile). It was working perfectly for the past 2 weeks, but since yesterday the chips disconnect every few seconds, showing the following 3 lines in the log, before reconnecting:

<info> app: Disconnected, reason 0x8.
<error> app: Fatal error
<warning> app: System reset

I've attached a picture of what I see in PuTTY.

I sometimes, though rarely, also get the error "Disconnected, reason 0x3E." after which the chips cannot reconnect at all, I have to reset them.

Any ideas on how to fix this?

Thank you.

[Balaji Srinivasan]

The disconnected reason 0x8 corresponds to a TIMEOUT. This means that the hrc_c application has lost contact with the hrs application for some reason. It could be that the hrs application crashed, or it was simply moved far away (physically) from the hrs_c among other reasons.

The Disconnected reason 0x3E means 'Connection failed to be established'. This occurs when the hrs_c tried to connect to hrs but couldn't. The root cause for this should be the same as for the disconnect reason 0x8, only that it happens much earlier in the connection.

[bjorn-spockeli]

The disconnect reasons are BLE_HCI_STATUS_CODES, which are listed in ble_hci.h and here on Infocenter. 

BLE_HCI_CONNECTION_TIMEOUT  0x08

BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED  0x3E

[Watermelon]

Thank you for your answer.

I have the chips quite close to each other when running the example. How would I be able to check if there is something causing the hrs application to crash?

[Balaji Srinivasan]

Do you have similar logs from the hrs application? Or do you have the possibility to debug the hrs application?