mirror of
https://github.com/espressif/esp-idf.git
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249 lines
7.8 KiB
C
249 lines
7.8 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include "host/ble_hs.h"
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#include "host/ble_uuid.h"
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#include "services/gap/ble_svc_gap.h"
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#include "services/gatt/ble_svc_gatt.h"
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#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 ***/
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#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,
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0x99, 0x99, 0x43, 0x95, 0x12, 0x2f, 0x46, 0x59);
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/* A characteristic that can be subscribed to */
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static uint8_t gatt_svr_chr_val;
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static uint16_t gatt_svr_chr_val_handle;
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static const ble_uuid128_t gatt_svr_chr_uuid =
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BLE_UUID128_INIT(0x00, 0x00, 0x00, 0x00, 0x11, 0x11, 0x11, 0x11,
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0x22, 0x22, 0x22, 0x22, 0x33, 0x33, 0x33, 0x33);
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/* A custom descriptor */
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static uint8_t gatt_svr_dsc_val;
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static const ble_uuid128_t gatt_svr_dsc_uuid =
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BLE_UUID128_INIT(0x01, 0x01, 0x01, 0x01, 0x12, 0x12, 0x12, 0x12,
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0x23, 0x23, 0x23, 0x23, 0x34, 0x34, 0x34, 0x34);
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static int
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gatt_svc_access(uint16_t conn_handle, uint16_t attr_handle,
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struct ble_gatt_access_ctxt *ctxt,
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void *arg);
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static const struct ble_gatt_svc_def gatt_svr_svcs[] = {
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{
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/*** Service ***/
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.type = BLE_GATT_SVC_TYPE_PRIMARY,
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.uuid = &gatt_svr_svc_uuid.u,
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.characteristics = (struct ble_gatt_chr_def[])
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{ {
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/*** This characteristic can be subscribed to by writing 0x00 and 0x01 to the CCCD ***/
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.uuid = &gatt_svr_chr_uuid.u,
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.access_cb = gatt_svc_access,
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#if CONFIG_EXAMPLE_ENCRYPTION
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.flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_WRITE |
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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,
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#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,
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#endif
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.val_handle = &gatt_svr_chr_val_handle,
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.descriptors = (struct ble_gatt_dsc_def[])
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{ {
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.uuid = &gatt_svr_dsc_uuid.u,
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#if CONFIG_EXAMPLE_ENCRYPTION
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.att_flags = BLE_ATT_F_READ | BLE_ATT_F_READ_ENC,
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#else
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.att_flags = BLE_ATT_F_READ,
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#endif
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.access_cb = gatt_svc_access,
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}, {
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0, /* No more descriptors in this characteristic */
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}
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},
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}, {
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0, /* No more characteristics in this service. */
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}
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},
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},
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{
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0, /* No more services. */
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},
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};
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static int
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gatt_svr_write(struct os_mbuf *om, uint16_t min_len, uint16_t max_len,
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void *dst, uint16_t *len)
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{
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uint16_t om_len;
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int rc;
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om_len = OS_MBUF_PKTLEN(om);
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if (om_len < min_len || om_len > max_len) {
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return BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
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}
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rc = ble_hs_mbuf_to_flat(om, dst, max_len, len);
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if (rc != 0) {
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return BLE_ATT_ERR_UNLIKELY;
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}
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return 0;
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}
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/**
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* Access callback whenever a characteristic/descriptor is read or written to.
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* Here reads and writes need to be handled.
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* ctxt->op tells weather the operation is read or write and
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* weather it is on a characteristic or descriptor,
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* ctxt->dsc->uuid tells which characteristic/descriptor is accessed.
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* attr_handle give the value handle of the attribute being accessed.
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* Accordingly do:
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* Append the value to ctxt->om if the operation is READ
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* Write ctxt->om to the value if the operation is WRITE
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**/
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static int
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gatt_svc_access(uint16_t conn_handle, uint16_t attr_handle,
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struct ble_gatt_access_ctxt *ctxt, void *arg)
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{
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const ble_uuid_t *uuid;
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int rc;
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switch (ctxt->op) {
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case BLE_GATT_ACCESS_OP_READ_CHR:
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if (conn_handle != BLE_HS_CONN_HANDLE_NONE) {
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MODLOG_DFLT(INFO, "Characteristic read; conn_handle=%d attr_handle=%d\n",
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conn_handle, attr_handle);
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} else {
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MODLOG_DFLT(INFO, "Characteristic read by NimBLE stack; attr_handle=%d\n",
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attr_handle);
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}
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uuid = ctxt->chr->uuid;
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if (attr_handle == gatt_svr_chr_val_handle) {
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rc = os_mbuf_append(ctxt->om,
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&gatt_svr_chr_val,
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sizeof(gatt_svr_chr_val));
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return rc == 0 ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
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}
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goto unknown;
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case BLE_GATT_ACCESS_OP_WRITE_CHR:
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if (conn_handle != BLE_HS_CONN_HANDLE_NONE) {
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MODLOG_DFLT(INFO, "Characteristic write; conn_handle=%d attr_handle=%d",
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conn_handle, attr_handle);
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} else {
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MODLOG_DFLT(INFO, "Characteristic write by NimBLE stack; attr_handle=%d",
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attr_handle);
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}
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uuid = ctxt->chr->uuid;
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if (attr_handle == gatt_svr_chr_val_handle) {
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rc = gatt_svr_write(ctxt->om,
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sizeof(gatt_svr_chr_val),
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sizeof(gatt_svr_chr_val),
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&gatt_svr_chr_val, NULL);
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ble_gatts_chr_updated(attr_handle);
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MODLOG_DFLT(INFO, "Notification/Indication scheduled for "
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"all subscribed peers.\n");
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return rc;
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}
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goto unknown;
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case BLE_GATT_ACCESS_OP_READ_DSC:
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if (conn_handle != BLE_HS_CONN_HANDLE_NONE) {
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MODLOG_DFLT(INFO, "Descriptor read; conn_handle=%d attr_handle=%d\n",
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conn_handle, attr_handle);
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} else {
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MODLOG_DFLT(INFO, "Descriptor read by NimBLE stack; attr_handle=%d\n",
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attr_handle);
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}
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uuid = ctxt->dsc->uuid;
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if (ble_uuid_cmp(uuid, &gatt_svr_dsc_uuid.u) == 0) {
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rc = os_mbuf_append(ctxt->om,
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&gatt_svr_dsc_val,
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sizeof(gatt_svr_chr_val));
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return rc == 0 ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
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}
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goto unknown;
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case BLE_GATT_ACCESS_OP_WRITE_DSC:
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goto unknown;
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default:
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goto unknown;
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}
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unknown:
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/* Unknown characteristic/descriptor;
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* The NimBLE host should not have called this function;
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*/
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assert(0);
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return BLE_ATT_ERR_UNLIKELY;
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}
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void
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gatt_svr_register_cb(struct ble_gatt_register_ctxt *ctxt, void *arg)
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{
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char buf[BLE_UUID_STR_LEN];
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switch (ctxt->op) {
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case BLE_GATT_REGISTER_OP_SVC:
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MODLOG_DFLT(DEBUG, "registered service %s with handle=%d\n",
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ble_uuid_to_str(ctxt->svc.svc_def->uuid, buf),
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ctxt->svc.handle);
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break;
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case BLE_GATT_REGISTER_OP_CHR:
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MODLOG_DFLT(DEBUG, "registering characteristic %s with "
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"def_handle=%d val_handle=%d\n",
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ble_uuid_to_str(ctxt->chr.chr_def->uuid, buf),
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ctxt->chr.def_handle,
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ctxt->chr.val_handle);
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break;
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case BLE_GATT_REGISTER_OP_DSC:
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MODLOG_DFLT(DEBUG, "registering descriptor %s with handle=%d\n",
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ble_uuid_to_str(ctxt->dsc.dsc_def->uuid, buf),
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ctxt->dsc.handle);
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break;
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default:
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assert(0);
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break;
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}
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}
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int
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gatt_svr_init(void)
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{
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int rc;
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ble_svc_gap_init();
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ble_svc_gatt_init();
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ble_svc_ans_init();
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rc = ble_gatts_count_cfg(gatt_svr_svcs);
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if (rc != 0) {
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return rc;
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}
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rc = ble_gatts_add_svcs(gatt_svr_svcs);
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if (rc != 0) {
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return rc;
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}
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/* Setting a value for the read-only descriptor */
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gatt_svr_dsc_val = 0x99;
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return 0;
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}
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