OVMS3-idf/examples/10_gatt_client/main/gattc_demo.c

// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed 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.



/****************************************************************************
*
* This file is for gatt client. It can scan ble device, connect one device, 
*
****************************************************************************/

#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include "controller.h"

#include "bt.h"
#include "bt_trace.h"
#include "bt_types.h"
#include "btm_api.h"
#include "bta_api.h"
#include "bta_gatt_api.h"
#include "esp_gap_ble_api.h"
#include "esp_gattc_api.h"
#include "esp_gatt_defs.h"
#include "esp_bt_main.h"


#define BT_BD_ADDR_STR         "%02x:%02x:%02x:%02x:%02x:%02x"
#define BT_BD_ADDR_HEX(addr)   addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]

esp_gatt_if_t client_if;
esp_gatt_status_t status = ESP_GATT_ERROR;
bool connet = false;
uint16_t simpleClient_id = 0xEE;

const char device_name[] = "Heart Rate";

static esp_ble_scan_params_t ble_scan_params =
{
	.scan_type 				= BLE_SCAN_TYPE_ACTIVE,
	.own_addr_type			= ESP_PUBLIC_ADDR,
	.scan_filter_policy		= BLE_SCAN_FILTER_ALLOW_ALL,
	.scan_interval			= 0x50,
	.scan_window			= 0x30
};


static void esp_gap_cb(uint32_t event, void *param);

static void esp_gattc_cb(uint32_t event, void *param);

static void esp_gap_cb(uint32_t event, void *param)
{
	uint8_t *adv_name = NULL;
	uint8_t adv_name_len = 0;
	switch(event)
	{
		case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT:
		{
			//the unit of the duration is second
			uint32_t duration = 10;
			esp_ble_gap_start_scanning(duration);
			break;
		}
		case ESP_GAP_BLE_SCAN_RESULT_EVT:
		{
			esp_ble_gap_cb_param_t *scan_result = (esp_ble_gap_cb_param_t *)param;
			switch(scan_result->scan_rst.search_evt)
			{
 				case ESP_GAP_SEARCH_INQ_RES_EVT:
					for (int i = 0; i < 6; i++)
					{
						LOG_INFO("%x:", scan_result->scan_rst.bda[i]);
					}
					LOG_INFO("\n");
					adv_name = esp_ble_resolve_adv_data(scan_result->scan_rst.ble_adv, 
											ESP_BLE_AD_TYPE_NAME_CMPL, &adv_name_len);
					LOG_INFO("adv_name_len=%x\n",adv_name_len);
					for(int j = 0; j < adv_name_len; j++)
					{
						LOG_INFO("%c",adv_name[j]);
					}
					LOG_INFO("\n");
					for(int j = 0; j < adv_name_len; j++)
					{
						LOG_INFO("%c",device_name[j]);
					}
					LOG_INFO("\n");
					
					if (adv_name != NULL)
					{
						if (strcmp((char *)adv_name, device_name) == 0)
						{
							LOG_INFO("the name eque to Heart Rate.\n");
							if (status ==  ESP_GATT_OK && connet == false)
							{
								connet = true;
								LOG_INFO("Connet to the remote device.\n");
								esp_ble_gap_stop_scanning();
								esp_ble_gattc_open(client_if, scan_result->scan_rst.bda, true);
							}
						}
					}
					break;
				case ESP_GAP_SEARCH_INQ_CMPL_EVT:
					break;
				default:
					break;
			}
			break;
		}
		default:
			break;
	}
}


static void esp_gattc_cb(uint32_t event, void *param)
{
	uint16_t conn_id = 0;
	esp_ble_gattc_cb_param_t *p_data = (esp_ble_gattc_cb_param_t *)param;

	LOG_INFO("esp_gattc_cb, event = %x\n", event);
	switch (event)
	{
		case ESP_GATTC_REG_EVT:
			status = p_data->reg.status;
			client_if = p_data->reg.gatt_if;
			LOG_INFO("status = %x, client_if = %x\n", status, client_if);
			break;
		case ESP_GATTC_OPEN_EVT: 
			conn_id = p_data->open.conn_id;
			LOG_INFO("ESP_GATTC_OPEN_EVT conn_id %d, if %d, status %d\n", conn_id, p_data->open.gatt_if, p_data->open.status);
			esp_ble_gattc_search_service(conn_id, NULL);
			break;
		case ESP_GATTC_SEARCH_RES_EVT: {
			esp_gatt_srvc_id_t *srvc_id = &p_data->search_res.service_id;
			conn_id = p_data->open.conn_id;
			LOG_INFO("SEARCH RES: conn_id = %x\n", conn_id);
			if (srvc_id->id.uuid.len == ESP_UUID_LEN_16) {
				LOG_INFO("UUID16: %x\n", srvc_id->id.uuid.uuid.uuid16);
			} else if (srvc_id->id.uuid.len == ESP_UUID_LEN_32) {
				LOG_INFO("UUID32: %x\n", srvc_id->id.uuid.uuid.uuid32);
			} else if (srvc_id->id.uuid.len == ESP_UUID_LEN_128) {
				LOG_INFO("UUID128: %x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x\n", srvc_id->id.uuid.uuid.uuid128[0],
                            srvc_id->id.uuid.uuid.uuid128[1],srvc_id->id.uuid.uuid.uuid128[2], srvc_id->id.uuid.uuid.uuid128[3],
                            srvc_id->id.uuid.uuid.uuid128[4],srvc_id->id.uuid.uuid.uuid128[5],srvc_id->id.uuid.uuid.uuid128[6],
                            srvc_id->id.uuid.uuid.uuid128[7],srvc_id->id.uuid.uuid.uuid128[8],srvc_id->id.uuid.uuid.uuid128[9],
                            srvc_id->id.uuid.uuid.uuid128[10],srvc_id->id.uuid.uuid.uuid128[11],srvc_id->id.uuid.uuid.uuid128[12],
                            srvc_id->id.uuid.uuid.uuid128[13],srvc_id->id.uuid.uuid.uuid128[14],srvc_id->id.uuid.uuid.uuid128[15]);
			} else {
				LOG_ERROR("UNKNOWN LEN %d\n", srvc_id->id.uuid.len);
			}
			break;
	    }
		case ESP_GATTC_SEARCH_CMPL_EVT:
			conn_id = p_data->search_cmpl.conn_id;
			LOG_INFO("SEARCH_CMPL: conn_id = %x, status %d\n",conn_id, p_data->search_cmpl.status);
			break;
		default:
			break;
	}
}

void ble_client_appRegister(void)
{
	LOG_INFO("register callback\n");

	//register the scan callback function to the gap moudule
	if((status = esp_ble_gap_register_callback(esp_gap_cb)) != ESP_OK){
		LOG_ERROR("gap register error, error code = %x\n",status);
		return;
	}

	//register the callback function to the gattc module
	if ((status = esp_ble_gattc_register_callback(esp_gattc_cb)) != ESP_OK){
		LOG_ERROR("gattc register error, error code = %x\n",status);
		return;
	}
	esp_ble_gattc_app_register(simpleClient_id);
	esp_ble_gap_set_scan_params(&ble_scan_params);
}

void gattc_client_test(void)
{
    esp_init_bluetooth();
    esp_enable_bluetooth();
    ble_client_appRegister();
}

void app_main()
{
    bt_controller_init();
	gattc_client_test();
}