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);
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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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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 |
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BLE_GATT_CHR_F_NOTIFY | BLE_GATT_CHR_F_INDICATE,
#else
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.flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_NOTIFY | BLE_GATT_CHR_F_INDICATE,
#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.
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* attr_handle give the value handle of the attribute being 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:
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if (conn_handle != BLE_HS_CONN_HANDLE_NONE) {
MODLOG_DFLT(INFO, "Characteristic read; conn_handle=%d attr_handle=%d\n",
conn_handle, attr_handle);
} else {
MODLOG_DFLT(INFO, "Characteristic read by NimBLE stack; attr_handle=%d\n",
attr_handle);
}
uuid = ctxt->chr->uuid;
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if (attr_handle == gatt_svr_chr_val_handle) {
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:
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if (conn_handle != BLE_HS_CONN_HANDLE_NONE) {
MODLOG_DFLT(INFO, "Characteristic write; conn_handle=%d attr_handle=%d",
conn_handle, attr_handle);
} else {
MODLOG_DFLT(INFO, "Characteristic write by NimBLE stack; attr_handle=%d",
attr_handle);
}
uuid = ctxt->chr->uuid;
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if (attr_handle == gatt_svr_chr_val_handle) {
rc = gatt_svr_write(ctxt->om,
sizeof(gatt_svr_chr_val),
sizeof(gatt_svr_chr_val),
&gatt_svr_chr_val, NULL);
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ble_gatts_chr_updated(attr_handle);
MODLOG_DFLT(INFO, "Notification/Indication scheduled for "
"all subscribed peers.\n");
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return rc;
}
goto unknown;
case BLE_GATT_ACCESS_OP_READ_DSC:
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if (conn_handle != BLE_HS_CONN_HANDLE_NONE) {
MODLOG_DFLT(INFO, "Descriptor read; conn_handle=%d attr_handle=%d\n",
conn_handle, attr_handle);
} else {
MODLOG_DFLT(INFO, "Descriptor read by NimBLE stack; attr_handle=%d\n",
attr_handle);
}
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;
}
}
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;
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return 0;
}