How to use throughput routines to connect to any le bluetooth device

RE: How to use throughput routines to connect to any le bluetooth device

lee123 — Sat, 03 May 2025 11:19:28 GMT

thank you ,i see it.https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-4-bluetooth-le-data-exchange/

RE: How to use throughput routines to connect to any le bluetooth device

Hung Bui — Wed, 30 Apr 2025 11:10:54 GMT

I would suggest you to take a look at the BLE fundamental course.

RE: How to use throughput routines to connect to any le bluetooth device

lee123 — Wed, 30 Apr 2025 09:40:52 GMT

Thanks for your reply,ok,i got it., I just want to know how to use gatt to communicate with a generic low-power bluetooth device.(3rd devices)

RE: How to use throughput routines to connect to any le bluetooth device

Hung Bui — Wed, 30 Apr 2025 09:21:28 GMT

Hi Lee,
I don't see the point of testing the throughput with the GATT service. Very often this GATT service doesn't have any characteristic. I don't know how you can test throughput with that.

What do you want to achieve ? If you want to test the throughput you need to test it on a meaningful service&characteristic, not the empty GATT service.

Please study the BLE fundamental. https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/

RE: How to use throughput routines to connect to any le bluetooth device

lee123 — Wed, 30 Apr 2025 07:08:14 GMT

hi Hung Bui,if there are any relevant API interface functions that can perform GATT transmission with third-party devices.When we were establishing a connection, the GATT service could not find information.

RE: How to use throughput routines to connect to any le bluetooth device

lee123 — Tue, 29 Apr 2025 13:52:07 GMT

Thanks for your reply，The example you provided ：https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/bluetooth/throughput/README.html. uses nus to test throughput, or use GATT? What do you think is the correct direction to implement this function?Throughput test with third-party le Bluetooth devices

RE: How to use throughput routines to connect to any le bluetooth device

Hung Bui — Tue, 29 Apr 2025 13:27:51 GMT

Hi,
Which exact characteristic you are planning to write to?
Note that you can't write any amount of data to a characteristic without considering the max size allowed for it.
I don't think you are going the right direction.

RE: How to use throughput routines to connect to any le bluetooth device

lee123 — Tue, 29 Apr 2025 13:01:39 GMT

Yes, I plan to connect to a service device without nus. The solution I tested is to use GATT for message transmission, and then record the timestamp of the transmission to determine the current throughput. Similar to the following code.

RE: How to use throughput routines to connect to any le bluetooth device

Hung Bui — Tue, 29 Apr 2025 10:47:32 GMT

Hi Lee,

Please give me the information on what you want to test first before going into modification.

What do you want to achieve ? Why you want to change NUS to GATT (?) Are you planning to connect to a 3rd party device that doesn't have NUS service ?

Note that without a NUS (or proprietary ) service you can't do throughput test.

RE: How to use throughput routines to connect to any le bluetooth device

lee123 — Tue, 29 Apr 2025 08:16:15 GMT

I modified the function's parameters, BT_UUID_NUS_SERVICE is changed to BT_UUID_GATT. this change is OK? because general devices do not have nus services

original code

err = bt_gatt_dm_start(conn,

BT_UUID_NUS_SERVICE,

&discovery_cb,

&nus_client);

modify:

err = bt_gatt_dm_start(conn,

BT_UUID_GATT,

&discovery_cb,

&nus_client);

RE: How to use throughput routines to connect to any le bluetooth device

lee123 — Tue, 29 Apr 2025 04:11:58 GMT

I am glad to receive the modified reply, thank you. I would like to know if there is an example that can directly connect to the BLE device and test throughput .

First, according to the sample, I modified his connection method using the following functionFirst, use the device found() function to find Bluetooth devices with rssi greater than -50. The core function is (void)bt_addr_le_to_str(addr, addr_str, sizeof(addr_str));

After finding it, use the bt_le_scan_stop() function to stop scanning, and then use bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, BT_LE_CONN_PARAM_DEFAULT, &default_conn); to create a connection. I can also scan the surrounding devices and establish a connection using this method,

but I changed the nus service to the gatt service, but it shows an error in the detection. The following are related pictures and source code.

sample,central_uart

devzone.nordicsemi.com/.../main_2800_3_2900_.c

RE: How to use throughput routines to connect to any le bluetooth device

Hung Bui — Mon, 28 Apr 2025 14:50:47 GMT

Hi Lee,
Could you please elaborate what you mean by routine ? Are you asking for sample ?
If you want to test throughput , you can take a look at this throughput sample: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/bluetooth/throughput/README.html

Note that the sample requires you to flash the firmware on both side central and peripheral to be able to test. It won't allow to simply just connect to any BLE device and test the throughput of it. And please also note that most of the Bluetooth headset doesn't use BLE, they use classic Bluetooth (BR-EDR) instead