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Nordic Case Info
  • Case ID: 301465
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Pairing works only on some android phones

Midhunjac

Hi,

I am modifying the peripheral_uart code to set a fixed pairing method so that I will have to enter a pre-defined passkey in my nrf connect application on my android. It works fine with my android. So I assume my callbacks and workflows are all fine. However, when I try to pair from some other phones, it does not work anymore. I am not even prompted for a passkey in other phone. In some phones, pairing fails with an error message on central (android) side with message 'Couldn't pair with Nordic_UART_Service. Make sure that it's ready to pair' . After this, every attempt to pairing fails without any messages. For some other phones, we do not even see a message. The central says 'Bonding..' and then says 'Not bonded'.

The logs in the peripheral side does not say much either.

I cannot use Just Works or fixed passkey for pairing here. I am using NCS V2.1.0 and nrf52832DK

have anyone faced this kind of problem ? Any help would be appreciated. Thank you

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  • 0 in reply to Menon

    Hi,

    sorry for being late to reply. Here is the from the android application side as requested.

    Fullscreen Log_ble.txt Download 
    nRF Connect, 2023-01-23
demo2000 (DD:7A:68:B3:AC:32)
V	15:39:52.130	Connecting to DD:7A:68:B3:AC:32...
D	15:39:52.130	gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D	15:39:52.172	[Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED
I	15:39:52.181	Disconnected
D	15:39:52.724	[Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
D	15:39:52.724	gatt.close()
D	15:39:52.738	[Callback] Connection state changed with status: 0 and new state: CONNECTED (2)
I	15:39:52.738	Connected to DD:7A:68:B3:AC:32
D	15:39:52.738	wait(200)
V	15:39:52.940	Connecting to DD:7A:68:B3:AC:32...
D	15:39:52.940	gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D	15:39:52.973	[Callback] Connection state changed with status: 0 and new state: CONNECTED (2)
I	15:39:52.973	Connected to DD:7A:68:B3:AC:32
V	15:39:52.981	Discovering services...
D	15:39:52.981	gatt.discoverServices()
I	15:39:53.016	Connection parameters updated (interval: 7.5ms, latency: 0, timeout: 5000ms)
I	15:39:53.078	PHY updated (TX: LE 2M, RX: LE 2M)
D	15:39:53.409	[Callback] Services discovered with status: 0
I	15:39:53.409	Services discovered
V	15:39:53.423	Device Information (0x180A)
- Manufacturer Name String [R] (0x2A29)
- Model Number String [R] (0x2A24)
- Serial Number String [R] (0x2A25)
- Hardware Revision String [R] (0x2A27)
- Firmware Revision String [R] (0x2A26)
- Software Revision String [R] (0x2A28)
Generic Attribute (0x1801)
- Service Changed [I] (0x2A05)
   Client Characteristic Configuration (0x2902)
- Client Supported Features [R W] (0x2B29)
- Database Hash [R] (0x2B2A)
Generic Access (0x1800)
- Device Name [R] (0x2A00)
- Appearance [R] (0x2A01)
- Peripheral Preferred Connection Parameters [R] (0x2A04)
Unknown Service (04d2ba59-e685-4b4e-91fe-4a028a00895f)
- Unknown Characteristic [N] (04d20003-e685-4b4e-91fe-4a028a00895f)
   Client Characteristic Configuration (0x2902)
- Unknown Characteristic [W WNR] (04d20002-e685-4b4e-91fe-4a028a00895f)
SMP Service (8d53dc1d-1db7-4cd3-868b-8a527460aa84)
- SMP Characteristic [N WNR] (da2e7828-fbce-4e01-ae9e-261174997c48)
   Client Characteristic Configuration (0x2902)
D	15:39:53.423	gatt.setCharacteristicNotification(00002a05-0000-1000-8000-00805f9b34fb, true)
D	15:39:53.426	gatt.setCharacteristicNotification(04d20003-e685-4b4e-91fe-4a028a00895f, true)
I	15:39:53.465	Connection parameters updated (interval: 45.0ms, latency: 0, timeout: 5000ms)
I	15:39:57.878	Connection parameters updated (interval: 45.0ms, latency: 0, timeout: 420ms)
V	15:40:19.148	Starting pairing...
D	15:40:19.148	device.createBond()
D	15:40:19.235	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_BONDING (11)
D	15:40:19.301	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_NONE (10)
I	15:40:19.301	Bonding failed
D	15:40:22.271	[Callback] Connection state changed with status: 0 and new state: DISCONNECTED (0)
I	15:40:22.271	Disconnected
D	15:40:22.289	[Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED
V	15:40:32.372	Starting pairing...
D	15:40:32.372	device.createBond()
D	15:40:32.445	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_BONDING (11)
D	15:40:32.640	[Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
D	15:40:32.640	gatt.close()
D	15:40:32.651	wait(200)
V	15:40:32.854	Connecting to DD:7A:68:B3:AC:32...
D	15:40:32.855	gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D	15:40:32.881	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_NONE (10)
I	15:40:32.881	Bonding failed
D	15:40:32.894	[Callback] Connection state changed with status: 0 and new state: CONNECTED (2)
I	15:40:32.894	Connected to DD:7A:68:B3:AC:32
V	15:40:32.901	Discovering services...
D	15:40:32.901	gatt.discoverServices()
I	15:40:33.161	PHY updated (TX: LE 2M, RX: LE 2M)
I	15:40:33.475	Connection parameters updated (interval: 7.5ms, latency: 0, timeout: 5000ms)
D	15:40:33.796	[Callback] Services discovered with status: 0
I	15:40:33.796	Services discovered
V	15:40:33.809	Device Information (0x180A)
- Manufacturer Name String [R] (0x2A29)
- Model Number String [R] (0x2A24)
- Serial Number String [R] (0x2A25)
- Hardware Revision String [R] (0x2A27)
- Firmware Revision String [R] (0x2A26)
- Software Revision String [R] (0x2A28)
Generic Attribute (0x1801)
- Service Changed [I] (0x2A05)
   Client Characteristic Configuration (0x2902)
- Client Supported Features [R W] (0x2B29)
- Database Hash [R] (0x2B2A)
Generic Access (0x1800)
- Device Name [R] (0x2A00)
- Appearance [R] (0x2A01)
- Peripheral Preferred Connection Parameters [R] (0x2A04)
Unknown Service (04d2ba59-e685-4b4e-91fe-4a028a00895f)
- Unknown Characteristic [N] (04d20003-e685-4b4e-91fe-4a028a00895f)
   Client Characteristic Configuration (0x2902)
- Unknown Characteristic [W WNR] (04d20002-e685-4b4e-91fe-4a028a00895f)
SMP Service (8d53dc1d-1db7-4cd3-868b-8a527460aa84)
- SMP Characteristic [N WNR] (da2e7828-fbce-4e01-ae9e-261174997c48)
   Client Characteristic Configuration (0x2902)
D	15:40:33.809	gatt.setCharacteristicNotification(00002a05-0000-1000-8000-00805f9b34fb, true)
D	15:40:33.812	gatt.setCharacteristicNotification(04d20003-e685-4b4e-91fe-4a028a00895f, true)
I	15:40:33.877	Connection parameters updated (interval: 45.0ms, latency: 0, timeout: 5000ms)
I	15:40:37.792	Connection parameters updated (interval: 45.0ms, latency: 0, timeout: 420ms)
V	15:40:52.632	Starting pairing...
D	15:40:52.632	device.createBond()
D	15:40:52.714	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_BONDING (11)
D	15:40:52.781	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_NONE (10)
I	15:40:52.781	Bonding failed
D	15:40:55.753	[Callback] Connection state changed with status: 0 and new state: DISCONNECTED (0)
I	15:40:55.753	Disconnected
D	15:40:55.765	[Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED
V	15:40:59.977	Starting pairing...
D	15:40:59.977	device.createBond()
D	15:41:00.061	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_BONDING (11)
D	15:41:00.267	[Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
D	15:41:00.267	gatt.close()
D	15:41:00.280	wait(200)
V	15:41:00.485	Connecting to DD:7A:68:B3:AC:32...
D	15:41:00.485	gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D	15:41:00.509	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_NONE (10)
I	15:41:00.509	Bonding failed
D	15:41:00.527	[Callback] Connection state changed with status: 0 and new state: CONNECTED (2)
I	15:41:00.527	Connected to DD:7A:68:B3:AC:32
V	15:41:00.533	Discovering services...
D	15:41:00.533	gatt.discoverServices()
I	15:41:00.790	PHY updated (TX: LE 2M, RX: LE 2M)
I	15:41:01.060	Connection parameters updated (interval: 7.5ms, latency: 0, timeout: 5000ms)
D	15:41:01.382	[Callback] Services discovered with status: 0
I	15:41:01.382	Services discovered
V	15:41:01.396	Device Information (0x180A)
- Manufacturer Name String [R] (0x2A29)
- Model Number String [R] (0x2A24)
- Serial Number String [R] (0x2A25)
- Hardware Revision String [R] (0x2A27)
- Firmware Revision String [R] (0x2A26)
- Software Revision String [R] (0x2A28)
Generic Attribute (0x1801)
- Service Changed [I] (0x2A05)
   Client Characteristic Configuration (0x2902)
- Client Supported Features [R W] (0x2B29)
- Database Hash [R] (0x2B2A)
Generic Access (0x1800)
- Device Name [R] (0x2A00)
- Appearance [R] (0x2A01)
- Peripheral Preferred Connection Parameters [R] (0x2A04)
Unknown Service (04d2ba59-e685-4b4e-91fe-4a028a00895f)
- Unknown Characteristic [N] (04d20003-e685-4b4e-91fe-4a028a00895f)
   Client Characteristic Configuration (0x2902)
- Unknown Characteristic [W WNR] (04d20002-e685-4b4e-91fe-4a028a00895f)
SMP Service (8d53dc1d-1db7-4cd3-868b-8a527460aa84)
- SMP Characteristic [N WNR] (da2e7828-fbce-4e01-ae9e-261174997c48)
   Client Characteristic Configuration (0x2902)
D	15:41:01.396	gatt.setCharacteristicNotification(00002a05-0000-1000-8000-00805f9b34fb, true)
D	15:41:01.399	gatt.setCharacteristicNotification(04d20003-e685-4b4e-91fe-4a028a00895f, true)
I	15:41:01.464	Connection parameters updated (interval: 45.0ms, latency: 0, timeout: 5000ms)
I	15:41:05.424	Connection parameters updated (interval: 45.0ms, latency: 0, timeout: 420ms)
V	15:41:09.147	Starting pairing...
D	15:41:09.147	device.createBond()
D	15:41:09.223	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_BONDING (11)
D	15:41:09.293	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_NONE (10)
I	15:41:09.293	Bonding failed
V	15:41:10.897	Starting pairing...
D	15:41:10.897	device.createBond()
D	15:41:11.001	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_BONDING (11)
D	15:41:11.045	[Broadcast] Action received: android.bluetooth.device.action.BOND_STATE_CHANGED, bond state changed to: BOND_NONE (10)
I	15:41:11.045	Bonding failed
D	15:41:14.025	[Callback] Connection state changed with status: 0 and new state: DISCONNECTED (0)
I	15:41:14.025	Disconnected
D	15:41:14.106	[Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED

    My code is built on the peripheral_uart example with some modifications to switch back and forth between Just Works mode and fixed passkey bonding. Please find attached the zipped code.

    peripheral_uart_switch.zip

    BTN3 on the DK to unpair and BTN4 on the DK to switch to Just Work. BTN2 to switch back to fixed passkey.

    Hope these helps. Please let me know if anything else is needed.

    Thank you

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