Problem reading CTS as a TIPC

Hi,

I am new to BLE. So happy to join this community :))

I am trying to use DA14580 as a timer profile client. Been having problem figuring out how to use GATTC read command to retrieve services from a time profile server :(((

1. Service discovery seems to work fine:
I was able to get through the discovery process and send tipc_enable_cfm_send(tipc_env, &tipc_env->con_info, PRF_ERR_OK) and move to the TIPC to "connected" state.
2. I then bond to the device I discovered
3. Once the bonding was established, I used the following code to try reading CTS information.

struct gattc_read_cmd *myReadCmd = KE_MSG_ALLOC(GATTC_READ_CMD, TASK_GATTC, TASK_APP, gattc_read_cmd);
myReadCmd ->req_type = GATTC_READ;

struct gattc_read_simple mySimpleRead;
mySimpleRead.handle = 0x22;
myReadCmd->req.simple = mySimpleRead;

ke_msg_send(myReadCmd);

4.然而,gattc_read_ind_handler()从未called. I have set up multiple break points in gattc_read_ind_handler(), no break point was fired.
5. GATTC_READ case under gattc_cmp_event was NEVER reached.
6. I have tried the above procedure (by that I mean discover -> bond device -> read CTS) using connection manager, it worked fine.

Really wish there could be more examples on how to use DA14580 as a central device and how to read GATT profiles and services.

Could anyone help?

Thank you!