hci_req
hci_req(HCI_CMD_REMOTE_NAME_REQ,
hci_req(HCI_CMD_READ_REMOTE_FEATURES,
static void hci_req(uint16_t, uint8_t , void *, size_t, void *, size_t);
#define save_value(opcode, cbuf, clen) hci_req(opcode, 0, cbuf, clen, NULL, 0)
#define load_value(opcode, rbuf, rlen) hci_req(opcode, 0, NULL, 0, rbuf, rlen)
#define hci_cmd(opcode, cbuf, clen) hci_req(opcode, 0, cbuf, clen, NULL, 0)