How shall i define multiple services in GATT Server database, so that only 1 service is seen by GATT Client at a time ?

[Deep Patel]

I am developing GATT Server Reader Firmware usng nRF SDK COnnect using NRF52840

I have implemented two services in reader FW in two files say: service_a.c and service_b.c

Both files have their respective GATT attribute table.

Both have their advertisement packet defined but only one is advertised based on user input.

Example scenario : Reader is advertising service a, when user inputs 1 to reader.

Reader changes its advertisement to service b, when user inputs 2 to reader.

Now, when user enters 1, mobile sees service a advertisement and it connects with reader.

Problem is .. when Mobile connects with Reader .. it sees service a as well as service b both !! 

How do i only expose service a when connected via service a advertisement and not the other ?

Example declaration of my both services in seperate files 

[Hung Bui]

Hi Deep Patel, 
If you search for "zephyr disconnect ble" you can find this link . And inside that you will find the function to disconnect: bt_conn_disconnect()

Yes you need to have CONFIG_BT_GATT_SERVICE_CHANGED=y to tell the peer device that it need to re-discovery the service every time it connects. 
I would suggest to test with nRF Connect app on the phone first before you test with your own app.