Could not discover Unkonwn Service of uuid

RE: Could not discover Unkonwn Service of uuid

jay — Mon, 19 Aug 2024 03:32:46 GMT

Hi 475A58:

Do you solve the problem?I have the same problem now. Please help me if you solved the problem.When i use the telink peripheral, the nRf52832 central can not discovery the 0xFFF0 service.But if i used the nRF51822 as peripheral, the nRF52832 central can discovery the 0xFFF0 service successfully.Please see this link nRF52832 central primary service discovery not found - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com) i asked.

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Fri, 14 Apr 2023 11:34:44 GMT

That is very much different than what I have.

I have copied the exact same definition for the Service UUID both on peripheral and central and hence I am sure that the central knows what it is looking for. Please check if the UUID you gave me is the same thing as the peripheral is transmitting. I do not know what else can cause this. If you attach BLE air sniffer log. then we might get some more insights.

RE: Could not discover Unkonwn Service of uuid

475A58 — Fri, 14 Apr 2023 02:13:17 GMT

Sure, the log information is shown in the following figure.

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Thu, 13 Apr 2023 14:56:20 GMT

It feels very strange because the nrf connect app is able to connect and discover all attributes from your peripheral.

Can you show me the logs of the central when you run it on nrf52832 device?

RE: Could not discover Unkonwn Service of uuid

475A58 — Thu, 13 Apr 2023 11:24:08 GMT

Yes, I flashed the binary from my project to nRF52832 device and I still can't discover the service of the device.

And I can't download the program to peripheral device because this is the product I bought.

Do you have any solution to this problem？Thank you.

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Wed, 12 Apr 2023 18:06:26 GMT

How exact are you testing this? You flashed the binary from my project to nRF52832 device. What are you flashing in the peripheral?

RE: Could not discover Unkonwn Service of uuid

475A58 — Tue, 11 Apr 2023 12:52:35 GMT

Thank you very much! I test your project and changed the UUID of the service to the UUID contained in the device and I still can't discover the service for the device after connected.

Is it because it contains two services and I only set the UUID of one of them? NRF52832 As a host discovery service, does it need to pre-write out all service UUIDs contained on the slave.

Or do you mean that the code is written to logically discover the services of the device?

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Tue, 11 Apr 2023 05:21:52 GMT

I am attaching the project for central that is able to connect to a peripheral with name #define DEVICE_NAME "QianShan01"
And then it is able to discover your service and connect to it.
devzone.nordicsemi.com/.../7673.ble_5F00_app_5F00_uart_5F00_c.zip

RE: Could not discover Unkonwn Service of uuid

475A58 — Mon, 10 Apr 2023 11:51:14 GMT

By the way, do you have KEIL on your computer? I'm not very good at IAR. So I would appreciate it if you sent me KEIL's project. It doesn't matter if not.

RE: Could not discover Unkonwn Service of uuid

475A58 — Mon, 10 Apr 2023 11:47:51 GMT

Yes, I used nRF52832 to make a PCB board as a Bluetooth host to connect a specific Bluetooth sensor. As mentioned earlier, it can connect to the sensor, but it cannot discover the services it contains. Do you know why p_ble_gattc_evt->gatt_status value is 0X010A?

I'm using nRF52832DK, can you test the 52832 and send it to me if you can? Because I'm in a bit of a hurry.

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Sun, 09 Apr 2023 14:12:34 GMT

I did not add any delays to start the discovery service. I missed to see that you are using nRF52832 and tested this on nRF52840 with S140 on it. But it should not make a difference in the code when the project is used for nRF52832.

I do not understand why the project is working for me and not at your end. Are you using a custom hardware? If you are using nRF52832 DK, then I can compile the project for 52832 this week and send it to you.

RE: Could not discover Unkonwn Service of uuid

475A58 — Wed, 05 Apr 2023 09:52:49 GMT

I've tried to find the service with a 600ms delay after connecting. But it didn't work. I did the debugging and the debugging information is as follows.

When the code executes to this function on_primary_srv_discovery_rsp，it found the services of 0XFFF0 UUID.

But p_ble_gattc_evt->gatt_status value is 0X010A, so the code executes to else.

Do you know Do you know why this is so？

RE: Could not discover Unkonwn Service of uuid

475A58 — Wed, 05 Apr 2023 07:07:55 GMT

Thank you for your answer, but I still can't discover the primary service of the device. Do I need to delay the operation of the discovery service after connecting to the device?

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Thu, 30 Mar 2023 16:12:01 GMT

Sure, here you go
devzone.nordicsemi.com/.../4578.ble_5F00_app_5F00_uart_5F00_c.zip

replace ble_nus_c.h with the file below.

devzone.nordicsemi.com/.../8814.ble_5F00_nus_5F00_c.h

Like I showed you in the log file, everything seems to work properly at my end.

RE: Could not discover Unkonwn Service of uuid

475A58 — Thu, 30 Mar 2023 15:01:52 GMT

Sorry, I tested the file you sent me, but it doesn't work, the reason is shown below. So I think if you send me the whole project of the central, I can test it on my board.

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Thu, 30 Mar 2023 14:38:04 GMT

For your convenience I will add the hex files that I tested with

Peripheral:on nRF52840DK_S140v7.2.0

devzone.nordicsemi.com/.../8883.ble_5F00_app_5F00_uart_5F00_pca10056_5F00_s140.hex

Central on nRF52832DK_S132v7.2.0

devzone.nordicsemi.com/.../6740.ble_5F00_app_5F00_uart_5F00_c_5F00_pca10040_5F00_s132.hex

RE: Could not discover Unkonwn Service of uuid

475A58 — Thu, 30 Mar 2023 14:37:51 GMT

But I still can't make it, could you send me that central project you tested. Thank you so much.

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Thu, 30 Mar 2023 14:29:15 GMT

I tested a central by changing only these lines

#define NUS_BASE_UUID                   {0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00} /**< Used vendor-specific UUID. */
#define BLE_UUID_NUS_SERVICE            0xfff0                      /**< The UUID of the Nordic UART Service. */
#define BLE_UUID_NUS_RX_CHARACTERISTIC  0xfff2                      /**< The UUID of the RX Characteristic. */
#define BLE_UUID_NUS_TX_CHARACTERISTIC  0xfff3                      /**< The UUID of the TX Characteristic. */
//#define NUS_BASE_UUID                   {{0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}} /**< Used vendor-specific UUID. */

//#define BLE_UUID_NUS_SERVICE            0x0001                      /**< The UUID of the Nordic UART Service. */
//#define BLE_UUID_NUS_RX_CHARACTERISTIC  0x0002                      /**< The UUID of the RX Characteristic. */
//#define BLE_UUID_NUS_TX_CHARACTERISTIC  0x0003                      /**< The UUID of the TX Characteristic. */

And the central can discover the services just file as seen from the peripheral with your custom UUID

<info> app_timer: RTC: initialized.
<debug> ble_scan: Adding filter on QianShan01 name
<info> app: BLE UART central example started.
<debug> ble_scan: Scanning
<debug> ble_scan: Connecting
<debug> ble_scan: Connection status: 0
<debug> nrf_ble_gatt: Requesting to update ATT MTU to 247 bytes on connection 0x0.
<debug> nrf_ble_gatt: Updating data length to 251 on connection 0x0.
<info> app: Connecting to target C2C3600473F0
<debug> nrf_ble_gq: Registering connection handle: 0x0000
<debug> ble_db_disc: Starting discovery of service with UUID 0xFFF0 on connection handle 0x0.
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Primary Services Discovery Request
dure will be attempted                       again later.
<debug> nrf_ble_gq: Processing the request queue...
<debug> nrf_ble_gq: GATTC Primary Service Discovery Request
U of 247 bytes.
<debug> nrf_ble_gatt: Updating ATT MTU to 247 bytes (desired: 247) on connection 0x0.
<debug> nrf_ble_gq: Processing the request queue...
<debug> nrf_ble_gq: GATTC Primary Service Discovery Request
<debug> nrf_ble_gq: SD is currently busy. The GATT request procedure will be attempted                           again later.
<debug> nrf_ble_gatt: ATT MTU updated to 247 bytes on connection 0x0 (response).
<info> app: ATT MTU exchange completed.
<info> app: Ble NUS max data length set to 0xF4(244)
<debug> nrf_ble_gq: Processing the request queue...
<debug> nrf_ble_gq: GATTC Primary Service Discovery Request
<debug> nrf_ble_gq: SD GATT procedure (2) succeeded on connection handle: 0.
<debug> nrf_ble_gatt: Data length updated to 251 on connection 0x0.
<debug> nrf_ble_gatt: max_rx_octets: 251
<debug> nrf_ble_gatt: max_tx_octets: 251
<debug> nrf_ble_gatt: max_rx_time: 2120
<debug> nrf_ble_gatt: max_tx_time: 2120
<debug> ble_db_disc: Found service UUID 0xFFF0.
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Characteristic Discovery Request
<debug> nrf_ble_gq: SD GATT procedure (3) succeeded on connection handle: 0.
<debug> nrf_ble_gq: Processing the request queue...
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Characteristic Discovery Request
<debug> nrf_ble_gq: SD GATT procedure (3) succeeded on connection handle: 0.
<debug> nrf_ble_gq: Processing the request queue...
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Characteristic Descriptor Request
<debug> nrf_ble_gq: SD GATT procedure (4) succeeded on connection handle: 0.
<debug> nrf_ble_gq: Processing the request queue...
<debug> ble_db_disc: Discovery of service with UUID 0xFFF0 completed with success on connection handle 0x0.
<info> app: Discovery complete.
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Write Request
<debug> nrf_ble_gq: SD GATT procedure (1) succeeded on connection handle: 0.
<info> app: Connected to device with Nordic UART Service.
<debug> nrf_ble_gq: Processing the request queue...
<debug> nrf_ble_gq: Processing the request queue...

RE: Could not discover Unkonwn Service of uuid

475A58 — Wed, 29 Mar 2023 13:39:09 GMT

It's okay, take care, I just need the code to discover this kind of UUID service.

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Wed, 29 Mar 2023 11:29:55 GMT

I am sorry for delay, Did not manage to look into your code yet due to sickness. I will try to test it your project this week.

RE: Could not discover Unkonwn Service of uuid

475A58 — Tue, 28 Mar 2023 09:24:07 GMT

Ok, thanks, looking forward to your reply.

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Fri, 24 Mar 2023 08:55:39 GMT

I will try to test your project on Monday. Thanks for your patience.

RE: Could not discover Unkonwn Service of uuid

475A58 — Thu, 23 Mar 2023 10:08:09 GMT

Sorry, the peripheral's service I use to discover is in the sensor I purchased, so I don't have the relevant code for the peripheral. I use nRF Connect APP to connect to the device, the information is below.

And the central project I used is as follows.

devzone.nordicsemi.com/.../nRF5SDK.zip

RE: Could not discover Unkonwn Service of uuid

Susheel Nuguru — Thu, 23 Mar 2023 08:49:09 GMT

It should work.

NUS and your your UUID are both vendor specific so I do not see why it should not work.

Are you sure that your peripheral has configured the right UUID? If you have taken NUS_peripheral as template then make sure that you have changed the UUID on the peripheral side aswell.

If possible attach the code snippets of peripheral side UUIDS in ble_nus.c and ble_nus.h and give me your whole central project.

RE: Could not discover Unkonwn Service of uuid

475A58 — Tue, 21 Mar 2023 09:25:28 GMT

So is it not feasible to simply replace the UUID of the NUS service with the UUID of the service I want to discover in the Nordic UART Service central example?as below