Connection index parameter in the api functions

Hello Dialog,

1. Could you explain what exactly is the connection index (Conn_idx) used in many api functions in the sdk? Is it something like an index value when two BLE devices form a connection? For example in the ble_suota_client.c, there is this function with parameters "ble_l2cap_send(peer_info.conn_idx, peer_info.scid, len, data_ptr);" what are the connection index (conn_idx) and the source channel identifier (scid), length values that are exactly passed into this function?

2. Also, there are functions for ble_l2cap_send and ble_l2cap_listen, but no ble_l2cap receive function, do we need to consider the listen as the receive function? I have already posted about this in the threadhttps://support.dialog-semiconductor.com/forums/post/dialog-smartbond-bl...and I am waiting for the response. Could you please explain the functions listen and send functions in the "ble_l2cap.h" in the sdk?

Thanks in advance.

Regards,

Prasanna