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 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.
7673.ble_app_uart_c.zip

[475A58]

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?

[Susheel Nuguru]

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

[475A58]

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.

[Susheel Nuguru]

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?

[475A58]

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

[Susheel Nuguru]

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.