How to send sensor data using BLE?

[hacktronics]

How to write to its own characteristics and notify the client? Want to send some sensor data using BLE. The examples shows callback, but not functions to write to its own characteristic, given the UUID.

[hacktronics]

I even used:

        att_server_request_can_send_now_event(con_handle);
        att_server_notify(con_handle, handleState, data, sizeof(data));

but that does not helped.