l2cap_request_alloc
int l2cap_request_alloc(struct l2cap_channel *, uint8_t);
err = l2cap_request_alloc(chan, L2CAP_CONNECT_REQ);
err = l2cap_request_alloc(chan, L2CAP_CONFIG_REQ);
err = l2cap_request_alloc(chan, L2CAP_DISCONNECT_REQ);
if (l2cap_request_alloc(chan, L2CAP_CONFIG_REQ))