l2cap_send_config_req
err = l2cap_send_config_req(chan);
int l2cap_send_config_req(struct l2cap_channel *);
err = l2cap_send_config_req(new);
l2cap_send_config_req(chan);
l2cap_send_config_req(chan); /* no state change */
l2cap_send_config_req(chan); /* no state change */