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nRF52832 / SDK 15 / Custom board / S132 / BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED

Hello,

When trying to connect to our custom board, it ends in Time out after 5 seconds.

On the board, I put the simple Nordic_Blinky example (\examples\ble_peripheral\ble_app_blinky from SDK V15.0.0)

In nRF Connect here what we get:

12:28:40.9290    Connecting to device
12:28:41.7650    Connected to device CA:2C:63:C2:4D:7B
12:28:41.8030    Disconnected from device CA:2C:63:C2:4D:7B, reason: BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED

End of nRF Connect log file:

2018-05-09T19:22:57.219Z DEBUG GAP_EVT_DISCONNECTED time:2018-05-09T19:22:57.220Z connHandle:0 reason:62 reasonName:connFailedToBeEstablished
2018-05-09T19:22:57.219Z INFO Disconnected from device CA:2C:63:C2:4D:7B, reason: BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED

What could be the reason for this BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED?

(We've never managed to connect to this board)

Thanks.

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