filetransfer.c

/*
 * BLE (Bluetooth Low energy) file transfer service.
 *
 * This file provides a BLE service and a characteristic which allows to 
 * write the content of the mytest.py file over BLE into the file system. 
 * We haven't found any existing BLE service which provides such a 
 * functionality so we implemented our own service.

 * The service uses the UUID in fileTransSvc
 * The characteristic uses the UUID in attTxChConfigUuid

 * BLE point to point links use a pretty small MTU (min 23 bytes, max 244
 * bytes) which is negotiated between the central and the peripheral (card10).
 * 
 * The first byte of each message is the type of message being send,
 * different types are supported and based on this type the next bytes
 * have different meaning.
 * 
 * TODOs:
 * * File deletion
 * * File read
 * * Directory creation
 * * Directory listing
 */

#include "wsf_types.h"
#include "wsf_os.h"
#include "wsf_buf.h"
#include "wsf_timer.h"
#include "wsf_trace.h"
#include "app_ui.h"
#include "fit/fit_api.h"
#include "hci_vs.h"

#include <epicardium.h>
#include "modules/log.h"

#include "util/bstream.h"
#include "att_api.h"

#include "FreeRTOS.h"
#include "crc32.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <machine/endian.h>

/*!< \brief Service start handle. */
#define FILE_TRANS_START_HDL 0x820
/*!< \brief Service end handle. */
#define FILE_TRANS_END_HDL (FILE_TRANS_MAX_HDL - 1)

#define FILE_TRANS_UUID_SUFFIX                                                 \
	0x42, 0x23, 0x42, 0x23, 0x42, 0x23, 0x42, 0x23, 0x42, 0x23, 0x42, 0x23
#define FILE_TRANS_UUID_PREFIX 0x01, 0x23, 0x42

/*
 * This has to match in order and number of members to the functions
 * called in fileTransAddGroupDyn() otherwise the stack breaks.
 */
enum {
	/*!< \brief File transfer service declaration */
	FILE_TRANS_SVC_HDL = FILE_TRANS_START_HDL,
	/*!< \brief File transfer Central tx characteristic */
	FILE_TRANS_CENTRAL_TX_CH_HDL,
	/*!< \brief File transfer Central tx value */
	FILE_TRANS_CENTRAL_TX_VAL_HDL,
	/*!< \brief File transfer Central rx characteristic */