Accessing different services with pc-ble driver

Question

Hello, 
 I try to connect a BLE application with my PC by using an nRF52840 dongle and the PC-BLE driver. But I got stuck in the understanding of the driver, so I hope that someone can help me. 
 The ESP32 provides two additional services: 
 
 A device information service 
 A battery service 
 
 I run a modified version of the BLE driver from a Qt application and the service discovery outputs three services 
 "Received service discovery response. Service count: 3" " Service UUID: 0x1800" " Service UUID: 0x1801" " Service UUID: 0x180a" 
 But where is the fourth service? I only got the two common services and the device information service, but the battery service is missing. 
 How can I use multiple services with the BLE driver? I have figured out that I can store the handles of each service by looping through each service after the discovery. And I assume that I have to use each handle to access a discovered service? 
 And I´m looking for an example for reading / writing some values from the characteristics of a given service. Do you have an example? 
 Thank you for your help

Hung Bui · Accepted Answer

I assume you are trying to do is to do generic service discovery. Very similar to what our nRF Connect BLE app is doing. I would suggest to have a look at this discussion here: custom service discovery in BLE_Central 
 
 It's about 4 years old but still relevant I think. 
 After you receive the services, you would also receive the uuid and the handle_range of the services. Based on the range, you can start doing your characteristic discovery. I would suggest to have a look at our ble_db_discovery.c as the reference.

Accessing different services with pc-ble driver

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