Service discovery at central NR52840

[Prajakta]

Hi,

I am scanning for particular device name, and able to connect.I am using ble_app_gatt example.

Now i want to discover services of that connected device and print all this services and characterisitics.

I saw ble_app_uart example consist this but while running this example, on other side ble_app_uart peripheral code is running on other board.

Central side "BLE UART central example started" got this on terminal.Nothing is happening after that.

Please guide me for
1. How to print services of connected device.

2. How to run UART example.

[AndreasF]

Hi.

1. If you want to print print services you have to collect the services, place them in a buffer, and use for example UART to print them.

2. You can read on our infocenter how you can run the UART examples, and more information on how the code works.

For SDK 15.2, you can read:

 Nordic UART Service Client (\examples\ble_central\ble_app_uart_c)

UART/Serial Port Emulation over BLE (\examples\ble_peripheral\ble_app_uart)

- Andreas

[Prajakta]

1. Which API needs to be used to collect services.

[AndreasF]

Hi.

If you look at the message sequence chart in the infocenter for primary service discovery, you can see that discovery is done by using the SoftDevice API sd_ble_gattc_primary_services_discover().

You have to iterate through the discovery like the message sequence chart by using sd_ble_gattc_primary_services_discover(), and you do this by increasing the start_handle giving p_srvc_uuid the vaule NULL.

The discovery module should also not be initialized in order for this to work. You have to do a manual discovery.

- Andreas

[Prajakta]

Is any initialization or declaration need to do in code. as I am using ble_app_gatts central example code.

[AndreasF]

Hi.

As I said, the discovery module should not be initialized, so dont do that if you do that in the main-loop (that means dont call db_discovery_init();).

- Andreas