We have a nRF based device being connected from a nRF51 dongle (PCA10031). We use pc-ble-driver 2.2.1.
We enable notifications and then we let the device running for a long time. At some point, we stop receiving any notifications, buy checking the log, we can se:
[12:03:23.446] Received notification, handle: 0x0023, value: 0xB7 0x04 0x1E 0x0F 0x00 0x00 [12:03:23.466] NRF Log:94910/ 0 <- [02 39 00 00 00 00 00 00 00 23 00 01 06 00 b9 04 79 0f 00 00 ] type: VENDOR_SPECIFIC reliable:yes seq#:7 ack#:2 payload_length:14 data_integrity:1 header_checksum:da err_code:0x0 [12:03:23.646] NRF Log: 94906 -> [N/A] type: ACK reliable: no seq#:0 ack#:0 payload_length:0 data_integrity:0 err_code:0x0 [12:03:23.646] Received notification, handle: 0x0023, value: 0xB9 0x04 0x79 0x0F 0x00 0x00 [12:03:23.656] NRF Log:94911/ 0 <- [02 39 00 00 00 00 00 00 00 23 00 01 06 00 b9 04 79 0f 00 00 ] type: VENDOR_SPECIFIC reliable:yes seq#:7 ack#:2 payload_length:14 data_integrity:1 header_checksum:da err_code:0x0 [12:03:23.656] NRF Log: 94907 -> [N/A] type: ACK reliable: no seq#:0 ack#:0 payload_length:0 data_integrity:0 err_code:0x0 [12:03:23.656] NRF Log:94912/ 0 <- [02 39 00 00 00 00 00 00 00 23 00 01 06 00 b9 04 79 0f 00 00 ] type: VENDOR_SPECIFIC reliable:yes seq#:7 ack#:2 payload_length:14 data_integrity:1 header_checksum:da err_code:0x0 [12:03:23.656] NRF Log: 94908 -> [N/A] type: ACK reliable: no seq#:0 ack#:0 payload_length:0 data_integrity:0 err_code:0x0 [12:03:23.656] NRF Log:94913/ 0 <- [02 39 00 00 00 00 00 00 00 23 00 01 06 00 b9 04 79 0f 00 00 ] type: VENDOR_SPECIFIC reliable:yes seq#:7 ack#:2 payload_length:14 data_integrity:1 header_checksum:da err_code:0x0 [12:03:23.656] NRF Log: 94909 -> [N/A] type: ACK reliable: no seq#:0 ack#:0 payload_length:0 data_integrity:0 err_code:0x0 [12:03:23.656] NRF Log:94914/ 0 <- [02 39 00 00 00 00 00 00 00 23 00 01 06 00 b9 04 79 0f 00 00 ] type: VENDOR_SPECIFIC reliable:yes seq#:7 ack#:2 payload_length:14 data_integrity:1 header_checksum:da err_code:0x0 [12:03:23.656] NRF Log: 94910 -> [N/A] type: ACK reliable: no seq#:0 ack#:0 payload_length:0 data_integrity:0 err_code:0x0 [12:03:23.766] NRF Log:94915/ 0 <- [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC] [12:03:23.766] NRF Log:State change: STATE_ACTIVE -> STATE_RESET [12:03:23.766] NRF Log: 94911 -> [N/A] type: RESERVED_5 reliable: no seq#:0 ack#:0 payload_length:0 data_integrity:0 err_code:0x0 [12:03:24.036] NRF Log:94916/ 0 <- [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC] [12:03:24.036] NRF Log:94917/ 0 <- [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC] [12:03:24.046] NRF Log:94918/ 0 <- [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC] [12:03:24.056] NRF Log:94919/ 0 <- [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC] [12:03:24.066] NRF Log:94920/ 0 <- [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC] [12:03:24.076] NRF Log:State change: STATE_RESET -> STATE_UNINITIALIZED [12:03:24.076] NRF Log:94921/ 0 <- [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC] [12:03:24.076] NRF Log: 94912 -> [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC] [12:03:24.076] NRF Log: 94913 -> [02 7d ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC_RESP] [12:03:24.076] NRF Log:94922/ 0 <- [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC] [12:03:24.076] NRF Log: 94914 -> [02 7d ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC_RESP] [12:03:24.086] NRF Log:94923/ 0 <- [02 7d ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC_RESP] [12:03:24.086] NRF Log:94924/ 0 <- [03 fc 11 ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:3 data_integrity:0 err_code:0x0 [CONFIG [ sliding-window-size:1 out-of-frame:0 data-integrity-check-type:1 version-number:0 ]] [12:03:24.086] NRF Log:State change: STATE_UNINITIALIZED -> STATE_INITIALIZED [12:03:24.086] NRF Log: 94915 -> [03 fc 11 ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:3 data_integrity:0 err_code:0x0 [CONFIG [ sliding-window-size:1 out-of-frame:0 data-integrity-check-type:1 version-number:0 ]] [12:03:24.086] NRF Log: 94916 -> [04 7b 11 ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:3 data_integrity:0 err_code:0x0 [CONFIG_RESP [ sliding-window-size:1 out-of-frame:0 data-integrity-check-type:1 version-number:0 ]] [12:03:24.096] NRF Log:94925/ 0 <- [04 7b 11 ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:3 data_integrity:0 err_code:0x0 [CONFIG_RESP [ sliding-window-size:1 out-of-frame:0 data-integrity-check-type:1 version-number:0 ]] [12:03:24.096] NRF Log:State change: STATE_INITIALIZED -> STATE_ACTIVE
But our app did not request the soft device to reset (I d'ont even know how this could be requested).
What could make the dongle reset it's state like that?
Note that we don't even get any BLE_GAP_EVT_DISCONNECTED notification, so our app still believe everything is still fine, while actually the connection was closed for good.
