/**
 * @file app_ble_proto.h
 * @brief BLE frame protocol frontend (over the rdtss write/notify
 *        characteristics): frame reassembly and CLI request/response
 *        transport. OTA frame types are reserved but not handled in
 *        this project (no flash OTA here).
 *
 * Frame format (little endian):
 *   [0]    SOF = 0xCA
 *   [1]    TYPE
 *   [2]    SEQ
 *   [3:4]  LEN (payload length, LE)
 *   [5..]  PAYLOAD
 *   [end-2..end] CRC16-CCITT (init 0xFFFF, poly 0x1021), LE, over TYPE..PAYLOAD
 *
 * All functions run in the BLE schedule task context only.
 */
#ifndef __APP_BLE_PROTO_H__
#define __APP_BLE_PROTO_H__

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>

/* Frame types */
#define BLE_FRAME_CLI_REQ       0x01    /* phone -> device: one command line */
#define BLE_FRAME_CLI_RSP       0x02    /* device -> phone: response text chunk */
#define BLE_FRAME_CLI_RSP_END   0x03    /* device -> phone: {status u8} */
#define BLE_FRAME_OTA_BEGIN     0x10    /* reserved (not supported here) */
#define BLE_FRAME_OTA_DATA      0x11    /* reserved */
#define BLE_FRAME_OTA_END       0x12    /* reserved */
#define BLE_FRAME_OTA_RSP       0x1F    /* reserved */

/**
 * @brief Reset the protocol state machine.
 */
void app_ble_proto_init(void);

/**
 * @brief Feed a received BLE write chunk into the frame reassembler.
 *        Called from the rdtss write indication handler (BLE task context).
 */
void app_ble_proto_rx_bytes(const uint8_t* data, uint16_t len);

/**
 * @brief BLE disconnect hook: drop half-received frame and uplink buffer.
 */
void app_ble_proto_on_disconnect(void);

#ifdef __cplusplus
}
#endif

#endif /* __APP_BLE_PROTO_H__ */