DFU support in Fast pair locator tag on nRF52833-DK

[Jignesh shingala]

Hi every one,

If any body have been succeeded  in adding DFU support in Fast pair locator tag on nRF52833-DK, if so can you guide me for it?

I am getting configuration and partition manager error every time.

regards,

Jignesh

[Vidar Berg]

Hi,

DFU should be enabled by default if you select the "release" configuration. Did you try that? 

Best regards,

Vidar

[Jignesh shingala]

Hi Vidar,

With this change it build successful, but when i tried to do dfu with generated dfu_application.zip, it is failing in eneabling bootloader. I have tested with DFU and Device manager apps in both app it is failing in bootloader enable.

Also generated merged.hex file siae is 1214KB and dfu_application.zip size is 420KB.

i have build this code for nRF52833-DK, then how merged.hex file size is possible more than 512KB?

[Jignesh shingala]

Hi Vidar,

Can you suggest if any other configurations need to be made for DFU in Locator Tag example code for nRF52833-DK? 

[Vidar Berg]

You still haven't provided any logs as I requested. You also need to ensure you are in dfu mode https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/bluetooth/fast_pair/locator_tag/README.html#dfu_mode 

[Jignesh shingala]

Hi Vidar,

this is release build so no logs from device side and for device manager app can you confirm where can we see logs?

[Vidar Berg]

Forgot that logs were disabled, but at least you can get the logs from the nrf connect app. Have you confirmed you are in dfu mode as well?

[Jignesh shingala]

please find attached nrf connect logs.

Fullscreen 0878.DFU_logs.txt Download

nRF Connect, 2026-01-21
NCS locator Tag (40:04:83:EA:03:A6)
V	15:56:13.989	Connecting to 40:04:83:EA:03:A6...
D	15:56:13.990	gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D	15:56:14.753	[Callback] Connection state changed with status: 133 and new state: DISCONNECTED (0)
E	15:56:14.753	Error 133 (0x85): GATT ERROR
I	15:56:14.753	Disconnected
D	15:56:16.698	gatt.close()
D	15:56:16.706	wait(200)
V	15:56:16.907	Connecting to 40:04:83:EA:03:A6...
D	15:56:16.907	gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D	15:56:17.835	[Callback] Connection state changed with status: 0 and new state: CONNECTED (2)
I	15:56:17.835	Connected to 40:04:83:EA:03:A6
V	15:56:17.837	Discovering services...
D	15:56:17.837	gatt.discoverServices()
D	15:56:17.875	[Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
D	15:56:17.968	[Callback] Services discovered with status: 0
I	15:56:17.968	Services discovered
V	15:56:17.989	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)
Device Information (0x180A)
- Firmware Revision String [R] (0x2A26)
Accessory Non-Owner Service (15190001-12f4-c226-88ed-2ac5579f2a85)
- Accessory Non-Owner Characteristic [I W] (8e0c0001-1d68-fb92-bf61-48377421680e)
   Client Characteristic Configuration (0x2902)
Google Fast Pair Service (0xFE2C)
- Key-based Pairing [N W] (fe2c1234-8366-4814-8eb0-01de32100bea)
   Client Characteristic Configuration (0x2902)
- Passkey [N W] (fe2c1235-8366-4814-8eb0-01de32100bea)
   Client Characteristic Configuration (0x2902)
- Account Key [W] (fe2c1236-8366-4814-8eb0-01de32100bea)
- Beacon Actions [N R W] (fe2c1238-8366-4814-8eb0-01de32100bea)
   Client Characteristic Configuration (0x2902)
SMP Service (8d53dc1d-1db7-4cd3-868b-8a527460aa84)
- SMP Characteristic [N WNR] (da2e7828-fbce-4e01-ae9e-261174997c48)
   Client Characteristic Configuration (0x2902)
D	15:56:17.990	gatt.setCharacteristicNotification(00002a05-0000-1000-8000-00805f9b34fb, true)
D	15:56:17.995	gatt.setCharacteristicNotification(8e0c0001-1d68-fb92-bf61-48377421680e, true)
D	15:56:17.997	gatt.setCharacteristicNotification(fe2c1234-8366-4814-8eb0-01de32100bea, true)
D	15:56:18.000	gatt.setCharacteristicNotification(fe2c1235-8366-4814-8eb0-01de32100bea, true)
D	15:56:18.003	gatt.setCharacteristicNotification(fe2c1238-8366-4814-8eb0-01de32100bea, true)
I	15:56:18.452	Connection parameters updated (interval: 45.0ms, latency: 0, timeout: 1000ms)
V	15:56:26.415	[McuMgr] Connecting...
D	15:56:26.421	[McuMgr] gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, LE 1M)
D	15:56:26.514	[McuMgr] [Callback] Connection state changed with status: 0 and new state: 2 (CONNECTED)
I	15:56:26.520	[McuMgr] Connected to 40:04:83:EA:03:A6
D	15:56:26.526	[McuMgr] wait(300)
V	15:56:26.884	[McuMgr] Discovering services...
D	15:56:26.890	[McuMgr] gatt.discoverServices()
I	15:56:26.914	[McuMgr] Services discovered
V	15:56:26.919	[McuMgr] Primary service found
V	15:56:26.941	[McuMgr] Requesting new MTU...
D	15:56:26.947	[McuMgr] gatt.requestMtu(498)
I	15:56:27.113	[McuMgr] MTU changed to: 247
D	15:56:27.119	[McuMgr] gatt.setCharacteristicNotification(da2e7828-fbce-4e01-ae9e-261174997c48, true)
V	15:56:27.128	[McuMgr] Enabling notifications for da2e7828-fbce-4e01-ae9e-261174997c48
D	15:56:27.134	[McuMgr] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x01-00)
I	15:56:27.329	[McuMgr] Data written to descr. 00002902-0000-1000-8000-00805f9b34fb
V	15:56:27.339	[McuMgr] Waiting for value change...
V	15:56:27.345	[McuMgr] Writing characteristic da2e7828-fbce-4e01-ae9e-261174997c48 (WRITE COMMAND)
D	15:56:27.351	[McuMgr] gatt.writeCharacteristic(da2e7828-fbce-4e01-ae9e-261174997c48, value=0x000000010000FF06A0, WRITE COMMAND)
I	15:56:27.368	[McuMgr] Data written to da2e7828-fbce-4e01-ae9e-261174997c48
W	15:56:28.347	[McuMgr] Request timed out
V	15:56:28.356	[McuMgr] Requesting connection priority: HIGH (11.25–15ms, 0, 5s)...
D	15:56:28.516	[McuMgr] gatt.requestConnectionPriority(HIGH)
A	15:56:28.688	[McuMgr] Sending (9 bytes) Header (Version: 1, Op: 0, Flags: 0, Len: 1, Group: 0, Seq: 0, Command: 8) CBOR {}
I	15:56:28.804	Connection parameters updated (interval: 15.0ms, latency: 0, timeout: 5000ms)
V	15:56:28.860	[McuMgr] Writing characteristic da2e7828-fbce-4e01-ae9e-261174997c48 (WRITE COMMAND)
D	15:56:28.875	[McuMgr] gatt.writeCharacteristic(da2e7828-fbce-4e01-ae9e-261174997c48, value=0x0800000100000008A0, WRITE COMMAND)
I	15:56:28.881	[McuMgr] Connection parameters updated (interval: 15.0ms, latency: 0, timeout: 5000ms)
I	15:56:28.893	[McuMgr] Data written to da2e7828-fbce-4e01-ae9e-261174997c48
A	15:56:31.045	[McuMgr] Sending (9 bytes) Header (Version: 1, Op: 0, Flags: 0, Len: 1, Group: 1, Seq: 1, Command: 0) CBOR {}
V	15:56:31.052	[McuMgr] Writing characteristic da2e7828-fbce-4e01-ae9e-261174997c48 (WRITE COMMAND)
D	15:56:31.058	[McuMgr] gatt.writeCharacteristic(da2e7828-fbce-4e01-ae9e-261174997c48, value=0x0800000100010100A0, WRITE COMMAND)
I	15:56:31.068	[McuMgr] Data written to da2e7828-fbce-4e01-ae9e-261174997c48
V	15:56:36.046	[McuMgr] Disconnecting...
D	15:56:36.053	[McuMgr] gatt.disconnect()
D	15:56:36.224	[McuMgr] [Callback] Connection state changed with status: 0 and new state: 0 (DISCONNECTED)
I	15:56:36.234	[McuMgr] Disconnected
D	15:56:36.241	[McuMgr] gatt.close()
 

[Jignesh shingala]

Hi Vidar
have you got anything in nrf connect logs?

[Vidar Berg]

again, did you verify whether you were in DFU mode or not? 

[Jignesh shingala]

Hi Vidar,

It is not going in DFU mode, Can you explain me exact key sequence to put this board in DFU mode? 

[Vidar Berg]

Please read the documentation I linked to earlier which also covers how to enter DFU mode, and let me know if there’s anything you find unclear.

[Jignesh shingala]

Hi Vidar,

Thanks, DFU now working on nRF52833-DK board,

I have one more Query regarding DFU on nRF52832 based custom board for Fast pair locator tag code.

Can DFU enabled same way using release configuration in extra C make arguments or any other configurations required?