esp-idf/examples/bluetooth/nimble/bleprph/main/gatt_svr.c

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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "host/ble_hs.h"
#include "host/ble_uuid.h"
#include "services/gap/ble_svc_gap.h"
#include "services/gatt/ble_svc_gatt.h"
#include "bleprph.h"
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#include "services/ans/ble_svc_ans.h"
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/*** Maximum number of characteristics with the notify flag ***/
#define MAX_NOTIFY 5
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static const ble_uuid128_t gatt_svr_svc_uuid =
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BLE_UUID128_INIT(0x2d, 0x71, 0xa2, 0x59, 0xb4, 0x58, 0xc8, 0x12,
0x99, 0x99, 0x43, 0x95, 0x12, 0x2f, 0x46, 0x59);
/* A characteristic that can be subscribed to */
static uint8_t gatt_svr_chr_val;
static uint16_t gatt_svr_chr_val_handle;
static const ble_uuid128_t gatt_svr_chr_uuid =
BLE_UUID128_INIT(0x00, 0x00, 0x00, 0x00, 0x11, 0x11, 0x11, 0x11,
0x22, 0x22, 0x22, 0x22, 0x33, 0x33, 0x33, 0x33);
/* A custom descriptor */
static uint8_t gatt_svr_dsc_val;
static const ble_uuid128_t gatt_svr_dsc_uuid =
BLE_UUID128_INIT(0x01, 0x01, 0x01, 0x01, 0x12, 0x12, 0x12, 0x12,
0x23, 0x23, 0x23, 0x23, 0x34, 0x34, 0x34, 0x34);
static void* subscription_list_buffer;
static struct os_mempool subscription_list_mempool;
struct subscription {
SLIST_ENTRY(subscription) next;
uint16_t val_handle;
};
SLIST_HEAD(subscription_list, subscription);
/*** SLIST that contains the handles of all the characteristics that are subscribed ***/
static struct subscription_list slist;
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static int
gatt_svc_access(uint16_t conn_handle, uint16_t attr_handle,
struct ble_gatt_access_ctxt *ctxt,
void *arg);
static bool
gatt_svr_is_subscribed(uint16_t val_handle);
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static const struct ble_gatt_svc_def gatt_svr_svcs[] = {
{
/*** Service ***/
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.type = BLE_GATT_SVC_TYPE_PRIMARY,
.uuid = &gatt_svr_svc_uuid.u,
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.characteristics = (struct ble_gatt_chr_def[])
{ {
/*** This characteristic can be subscribed to by writing 0x00 and 0x01 to the CCCD ***/
.uuid = &gatt_svr_chr_uuid.u,
.access_cb = gatt_svc_access,
#if CONFIG_EXAMPLE_ENCRYPTION
.flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_WRITE |
BLE_GATT_CHR_F_READ_ENC | BLE_GATT_CHR_F_WRITE_ENC |
BLE_GATT_CHR_F_NOTIFY,
#else
.flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_NOTIFY,
#endif
.val_handle = &gatt_svr_chr_val_handle,
.descriptors = (struct ble_gatt_dsc_def[])
{ {
.uuid = &gatt_svr_dsc_uuid.u,
#if CONFIG_EXAMPLE_ENCRYPTION
.att_flags = BLE_ATT_F_READ | BLE_ATT_F_READ_ENC,
#else
.att_flags = BLE_ATT_F_READ,
#endif
.access_cb = gatt_svc_access,
}, {
0, /* No more descriptors in this characteristic */
}
},
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}, {
0, /* No more characteristics in this service. */
}
},
},
{
0, /* No more services. */
},
};
static int
gatt_svr_write(struct os_mbuf *om, uint16_t min_len, uint16_t max_len,
void *dst, uint16_t *len)
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{
uint16_t om_len;
int rc;
om_len = OS_MBUF_PKTLEN(om);
if (om_len < min_len || om_len > max_len) {
return BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
}
rc = ble_hs_mbuf_to_flat(om, dst, max_len, len);
if (rc != 0) {
return BLE_ATT_ERR_UNLIKELY;
}
return 0;
}
/**
* Access callback whenever a characteristic/descriptor is read or written to.
* Here reads and writes need to be handled.
* ctxt->op tells weather the operation is read or write and
* weather it is on a characteristic or descriptor,
* ctxt->dsc->uuid tells which characteristic/descriptor is accessed.
* Accordingly do:
* Append the value to ctxt->om if the operation is READ
* Write ctxt->om to the value if the operation is WRITE
**/
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static int
gatt_svc_access(uint16_t conn_handle, uint16_t attr_handle,
struct ble_gatt_access_ctxt *ctxt, void *arg)
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{
const ble_uuid_t *uuid;
int rc;
switch (ctxt->op) {
case BLE_GATT_ACCESS_OP_READ_CHR:
uuid = ctxt->chr->uuid;
if (ble_uuid_cmp(uuid, &gatt_svr_chr_uuid.u) == 0) {
rc = os_mbuf_append(ctxt->om,
&gatt_svr_chr_val,
sizeof(gatt_svr_chr_val));
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return rc == 0 ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
}
goto unknown;
case BLE_GATT_ACCESS_OP_WRITE_CHR:
uuid = ctxt->chr->uuid;
if (ble_uuid_cmp(uuid, &gatt_svr_chr_uuid.u) == 0) {
rc = gatt_svr_write(ctxt->om,
sizeof(gatt_svr_chr_val),
sizeof(gatt_svr_chr_val),
&gatt_svr_chr_val, NULL);
if (gatt_svr_is_subscribed(attr_handle)) {
struct os_mbuf *txom;
uint8_t notification[] = {0x00, 0x01, 0x02, 0x03};
txom = ble_hs_mbuf_from_flat(notification, sizeof(notification));
/* No need to free txom as it is consumed by ble_gattc_notify_custom */
rc = ble_gattc_notify_custom(conn_handle,
gatt_svr_chr_val_handle, txom);
if (rc == 0) {
MODLOG_DFLT(INFO, "Notification sent succesfully\n");
} else {
MODLOG_DFLT(INFO, "Error in sending notification rc = %d\n", rc);
}
}
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return rc;
}
goto unknown;
case BLE_GATT_ACCESS_OP_READ_DSC:
uuid = ctxt->dsc->uuid;
if (ble_uuid_cmp(uuid, &gatt_svr_dsc_uuid.u) == 0) {
rc = os_mbuf_append(ctxt->om,
&gatt_svr_dsc_val,
sizeof(gatt_svr_chr_val));
return rc == 0 ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
}
goto unknown;
case BLE_GATT_ACCESS_OP_WRITE_DSC:
goto unknown;
default:
goto unknown;
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}
unknown:
/* Unknown characteristic/descriptor;
* The NimBLE host should not have called this function;
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*/
assert(0);
return BLE_ATT_ERR_UNLIKELY;
}
void
gatt_svr_register_cb(struct ble_gatt_register_ctxt *ctxt, void *arg)
{
char buf[BLE_UUID_STR_LEN];
switch (ctxt->op) {
case BLE_GATT_REGISTER_OP_SVC:
MODLOG_DFLT(DEBUG, "registered service %s with handle=%d\n",
ble_uuid_to_str(ctxt->svc.svc_def->uuid, buf),
ctxt->svc.handle);
break;
case BLE_GATT_REGISTER_OP_CHR:
MODLOG_DFLT(DEBUG, "registering characteristic %s with "
"def_handle=%d val_handle=%d\n",
ble_uuid_to_str(ctxt->chr.chr_def->uuid, buf),
ctxt->chr.def_handle,
ctxt->chr.val_handle);
break;
case BLE_GATT_REGISTER_OP_DSC:
MODLOG_DFLT(DEBUG, "registering descriptor %s with handle=%d\n",
ble_uuid_to_str(ctxt->dsc.dsc_def->uuid, buf),
ctxt->dsc.handle);
break;
default:
assert(0);
break;
}
}
/**
* Tells if a characteristic has been subscribed to
* based on it's value handle.
* All subscribed characteristic value handles are stored
* in an SLIST.
**/
static bool
gatt_svr_is_subscribed(uint16_t val_handle)
{
struct subscription *sub;
SLIST_FOREACH(sub, &slist, next) {
if (sub->val_handle == val_handle) {
return true;
}
}
return false;
}
/*
* Call this with the value handle of the characteristic
* that needs to be subscribed to, to add the handle in the
* list of subscribed characteristics
*/
int
gatt_svr_subscribe(uint16_t val_handle) {
struct subscription *sub;
SLIST_FOREACH(sub, &slist, next) {
if (sub->val_handle == val_handle) {
return BLE_ATT_ERR_INVALID_HANDLE;
}
}
sub = os_memblock_get(&subscription_list_mempool);
if (sub == NULL) {
/* Out of memory */
return BLE_ATT_ERR_INSUFFICIENT_RES;
}
memset(sub, 0, sizeof(struct subscription));
SLIST_NEXT(sub, next) = NULL;
sub->val_handle = val_handle;
SLIST_INSERT_HEAD(&slist, sub, next);
return 0;
}
/**
* Removes all subscriptions from the list
* of subscribed characteristics.
* Called upon disconnect
**/
void
gatt_svr_subscription_delete()
{
struct subscription *sub;
while(true) {
sub = SLIST_FIRST(&slist);
if (sub == NULL) {
break;
}
SLIST_REMOVE_HEAD(&slist, next);
os_memblock_put(&subscription_list_mempool, sub);
sub = NULL;
}
os_mempool_clear(&subscription_list_mempool);
free(subscription_list_buffer);
subscription_list_buffer = NULL;
}
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int
gatt_svr_init(void)
{
int rc;
ble_svc_gap_init();
ble_svc_gatt_init();
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ble_svc_ans_init();
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rc = ble_gatts_count_cfg(gatt_svr_svcs);
if (rc != 0) {
return rc;
}
rc = ble_gatts_add_svcs(gatt_svr_svcs);
if (rc != 0) {
return rc;
}
/* Setting a value for the read-only descriptor */
gatt_svr_dsc_val = 0x99;
/* Allocating mempool for the SLIST */
subscription_list_buffer = malloc(OS_MEMPOOL_BYTES(MAX_NOTIFY, sizeof(struct subscription)));
if (subscription_list_buffer == NULL) {
rc = BLE_HS_ENOMEM;
return rc;
}
rc = os_mempool_init(&subscription_list_mempool, MAX_NOTIFY,
sizeof(struct subscription), subscription_list_buffer,
"subscription_list_mempool");
if (rc != 0) {
rc = BLE_HS_EOS;
free(subscription_list_buffer);
subscription_list_buffer = NULL;
MODLOG_DFLT(ERROR, "Error while allocating memory\n");
return rc;
}
SLIST_INIT(&slist);
assert(SLIST_EMPTY(&slist));
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return 0;
}