/*
* Copyright (C) 2014 BlueKitchen GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 4. Any redistribution, use, or modification is done solely for
* personal benefit and not for any commercial purpose or for
* monetary gain.
*
* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Please inquire about commercial licensing options at
* contact@bluekitchen-gmbh.com
*
*/
#define BTSTACK_FILE__ "gap_inquiry.c"
// *****************************************************************************
/* EXAMPLE_START(gap_inquiry): GAP Inquiry Example
*
* @text The Generic Access Profile (GAP) defines how Bluetooth devices discover
* and establish a connection with each other. In this example, the application
* discovers surrounding Bluetooth devices and collects their Class of Device
* (CoD), page scan mode, clock offset, and RSSI. After that, the remote name of
* each device is requested. In the following section we outline the Bluetooth
* logic part, i.e., how the packet handler handles the asynchronous events and
* data packets.
*/
// *****************************************************************************
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "btstack.h"
#define MAX_DEVICES 20
enum DEVICE_STATE { REMOTE_NAME_REQUEST, REMOTE_NAME_INQUIRED, REMOTE_NAME_FETCHED };
struct device {
bd_addr_t address;
uint8_t pageScanRepetitionMode;
uint16_t clockOffset;
enum DEVICE_STATE state;
};
#define INQUIRY_INTERVAL 5
struct device devices[MAX_DEVICES];
int deviceCount = 0;
enum STATE {INIT, ACTIVE} ;
enum STATE state = INIT;
static btstack_packet_callback_registration_t hci_event_callback_registration;
static int getDeviceIndexForAddress( bd_addr_t addr){
int j;
for (j=0; j< deviceCount; j++){
if (bd_addr_cmp(addr, devices[j].address) == 0){
return j;
}
}
return -1;
}
static void start_scan(void){
printf("Starting inquiry scan..\n");
gap_inquiry_start(INQUIRY_INTERVAL);
}
static int has_more_remote_name_requests(void){
int i;
for (i=0;i<deviceCount;i++) {
if (devices[i].state == REMOTE_NAME_REQUEST) return 1;
}
return 0;
}
static void do_next_remote_name_request(void){
int i;
for (i=0;i<deviceCount;i++) {
// remote name request
if (devices[i].state == REMOTE_NAME_REQUEST){
devices[i].state = REMOTE_NAME_INQUIRED;
printf("Get remote name of %s...\n", bd_addr_to_str(devices[i].address));
gap_remote_name_request( devices[i].address, devices[i].pageScanRepetitionMode, devices[i].clockOffset | 0x8000);
return;
}
}
}
static void continue_remote_names(void){
if (has_more_remote_name_requests()){
do_next_remote_name_request();
return;
}
start_scan();
}
/* @section Bluetooth Logic
*
* @text The Bluetooth logic is implemented as a state machine within the packet
* handler. In this example, the following states are passed sequentially:
* INIT, and ACTIVE.
*/
static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
bd_addr_t addr;
int i;
int index;
if (packet_type != HCI_EVENT_PACKET) return;
uint8_t event = hci_event_packet_get_type(packet);
switch(state){
/* @text In INIT, an inquiry scan is started, and the application transits to
* ACTIVE state.
*/
case INIT:
switch(event){
case BTSTACK_EVENT_STATE:
if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){
start_scan();
state = ACTIVE;
}
break;
default:
break;
}
break;
/* @text In ACTIVE, the following events are processed:
* - GAP Inquiry result event: BTstack provides a unified inquiry result that contain
* Class of Device (CoD), page scan mode, clock offset. RSSI and name (from EIR) are optional.
* - Inquiry complete event: the remote name is requested for devices without a fetched
* name. The state of a remote name can be one of the following:
* REMOTE_NAME_REQUEST, REMOTE_NAME_INQUIRED, or REMOTE_NAME_FETCHED.
* - Remote name request complete event: the remote name is stored in the table and the
* state is updated to REMOTE_NAME_FETCHED. The query of remote names is continued.
*/
case ACTIVE:
switch(event){
case GAP_EVENT_INQUIRY_RESULT:
if (deviceCount >= MAX_DEVICES) break; // already full
gap_event_inquiry_result_get_bd_addr(packet, addr);
index = getDeviceIndexForAddress(addr);
if (index >= 0) break; // already in our list
memcpy(devices[deviceCount].address, addr, 6);
devices[deviceCount].pageScanRepetitionMode = gap_event_inquiry_result_get_page_scan_repetition_mode(packet);
devices[deviceCount].clockOffset = gap_event_inquiry_result_get_clock_offset(packet);
// print info
printf("Device found: %s ", bd_addr_to_str(addr));
printf("with COD: 0x%06x, ", (unsigned int) gap_event_inquiry_result_get_class_of_device(packet));
printf("pageScan %d, ", devices[deviceCount].pageScanRepetitionMode);
printf("clock offset 0x%04x",devices[deviceCount].clockOffset);
if (gap_event_inquiry_result_get_rssi_available(packet)){
printf(", rssi %d dBm", (int8_t) gap_event_inquiry_result_get_rssi(packet));
}
if (gap_event_inquiry_result_get_name_available(packet)){
char name_buffer[240];
int name_len = gap_event_inquiry_result_get_name_len(packet);
memcpy(name_buffer, gap_event_inquiry_result_get_name(packet), name_len);
name_buffer[name_len] = 0;
printf(", name '%s'", name_buffer);
devices[deviceCount].state = REMOTE_NAME_FETCHED;;
} else {
devices[deviceCount].state = REMOTE_NAME_REQUEST;
}
printf("\n");
deviceCount++;
break;
case GAP_EVENT_INQUIRY_COMPLETE:
for (i=0;i<deviceCount;i++) {
// retry remote name request
if (devices[i].state == REMOTE_NAME_INQUIRED)
devices[i].state = REMOTE_NAME_REQUEST;
}
continue_remote_names();
break;
case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE:
reverse_bd_addr(&packet[3], addr);
index = getDeviceIndexForAddress(addr);
if (index >= 0) {
if (packet[2] == 0) {
printf("Name: '%s'\n", &packet[9]);
devices[index].state = REMOTE_NAME_FETCHED;
} else {
printf("Failed to get name: page timeout\n");
}
}
continue_remote_names();
break;
default:
break;
}
break;
default:
break;
}
}
/* @text For more details on discovering remote devices, please see
* Section on [GAP](../profiles/#sec:GAPdiscoverRemoteDevices).
*/
/* @section Main Application Setup
*
* @text Listing MainConfiguration shows main application code.
* It registers the HCI packet handler and starts the Bluetooth stack.
*/
/* LISTING_START(MainConfiguration): Setup packet handler for GAP inquiry */
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]) {
(void)argc;
(void)argv;
// enabled EIR
hci_set_inquiry_mode(INQUIRY_MODE_RSSI_AND_EIR);
hci_event_callback_registration.callback = &packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
// turn on!
hci_power_control(HCI_POWER_ON);
return 0;
}
/* LISTING_END */
/* EXAMPLE_END */