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Why am I seeing an LL_REJECT_IND from the slave intermittently?

I have an nRF51822-based peripheral using the SoftDevice 110 v7.0.0 and SDK v6.0.0. The peripheral uses two custom characteristics under a single custom service. I'm using the Device Manager. The central is an Android app using the new Android L preview BLE stack.

About half the time the central attempts to connect to the GATT server, discover services, and bond, the connection is immediately dropped. Here's a Wireshark screenshot and log of when that happens.

screenshot_wireshark_reject.png

ll_reject_ind_2014-08-29.pcapng

And here are my security parameters:

// Timeout for Pairing Request or Security Request (in seconds).
#define SEC_PARAM_TIMEOUT                 30

// Perform bonding.
#define SEC_PARAM_BOND                    1

// Man In The Middle protection NOT required.
#define SEC_PARAM_MITM                    0

// No I/O capabilities.
#define SEC_PARAM_IO_CAPABILITIES         BLE_GAP_IO_CAPS_NONE

// Out Of Band data not available.
#define SEC_PARAM_OOB                     0

// Minimum encryption key size.
#define SEC_PARAM_MIN_KEY_SIZE            7

// Maximum encryption key size.
#define SEC_PARAM_MAX_KEY_SIZE            16

I'd say this happens about a third to half the time. The rest of the time the connection is fine. Why is this happening? How do I debug this?

[Edit]

Here's the log from nRFLogger/MCP app on Android L:

mcp_log_disconnect_2014-09-02.txt

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  • @Eliot: You can download the MCP app from Google play. The source code for it is not available. We have a small issue with Android L, that you may need to uninstall nRFToolbox and nRFLogger before you install MCP.

    Since you have a PCA10000, could you try to run the Master Control Panel PC software and verify that bonding works properly on your device ? Have you tested with iOS or Android 4.4 devices ?

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  • @Eliot: You can download the MCP app from Google play. The source code for it is not available. We have a small issue with Android L, that you may need to uninstall nRFToolbox and nRFLogger before you install MCP.

    Since you have a PCA10000, could you try to run the Master Control Panel PC software and verify that bonding works properly on your device ? Have you tested with iOS or Android 4.4 devices ?

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