Could not discover Unkonwn Service of uuid

[475A58]

Hello,

Does anybody know why I can not discover the service uuid as shown in the picture below?

I want to connect a sensor with this chip nRF52832, it's service UUID is 0000fff0-0000-1000-8000-00805f9b34fb. I can scan into sensor and connect with it. But I can not discover this service.

The protocol stack version I use is nRF5_SDK_17.0.2_d674dde，the program I use is nRF5_SDK_17.0.2_d674dde\examples\ble_central. I changed the service UUID to discover-> NUS_BASE_UUID to 0000fff0-0000-1000-8000-00805f9b34fb.  I can't discover it.

Thank you,

[Susheel Nuguru]

I think the highlighted area is just saying that discovery has finished. It is one way to know that there are no more services to be found after the given index of 0xE1. Is 0xE1 your service? it does not look like one as it looks like an index to search.

Have you plugged in your own db_handler for your customer service?

For example in the Nordic UART Service central example (examples\ble_central\ble_app_uart_c\main.c), you have db_disc_handler for this specific service as below

static void db_discovery_init(void)
{
    ble_db_discovery_init_t db_init;

    memset(&db_init, 0, sizeof(ble_db_discovery_init_t));

    db_init.evt_handler  = db_disc_handler;
    db_init.p_gatt_queue = &m_ble_gatt_queue;

    ret_code_t err_code = ble_db_discovery_init(&db_init);
    APP_ERROR_CHECK(err_code);
}

You can see that this db_disc_handler is called for every service tthat is being discovered and you need to implement your own service discovery filter handler that does something only when the service of your interest is found.

[475A58]

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

[Susheel Nuguru]

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.

[475A58]

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.

nRF5SDK.zip

[Susheel Nuguru]

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

[475A58]

Ok, thanks, looking forward to your reply.

[Susheel Nuguru]

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.

[475A58]

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