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BluetoothSerial.cpp
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// Copyright 2018 Evandro Luis Copercini
//
// 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.
#include "sdkconfig.h"
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#if defined(CONFIG_BT_ENABLED) && defined(CONFIG_BLUEDROID_ENABLED)
#ifdef ARDUINO_ARCH_ESP32
#include "esp32-hal-log.h"
#endif
#include "BluetoothSerial.h"
#include "esp_bt.h"
#include "esp_bt_main.h"
#include "esp_gap_bt_api.h"
#include "esp_bt_device.h"
#include "esp_spp_api.h"
#include <esp_log.h>
#include "esp32-hal-log.h"
const char * _spp_server_name = "ESP32SPP";
#define RX_QUEUE_SIZE 512
#define TX_QUEUE_SIZE 32
#define SPP_TX_QUEUE_TIMEOUT 1000
#define SPP_TX_DONE_TIMEOUT 1000
#define SPP_CONGESTED_TIMEOUT 1000
static uint32_t _spp_client = 0;
static xQueueHandle _spp_rx_queue = NULL;
static xQueueHandle _spp_tx_queue = NULL;
static SemaphoreHandle_t _spp_tx_done = NULL;
static TaskHandle_t _spp_task_handle = NULL;
static EventGroupHandle_t _spp_event_group = NULL;
static EventGroupHandle_t _bt_event_group = NULL;
static boolean secondConnectionAttempt;
static esp_spp_cb_t * custom_spp_callback = NULL;
static BluetoothSerialDataCb custom_data_callback = NULL;
static esp_bd_addr_t current_bd_addr;
static ConfirmRequestCb confirm_request_callback = NULL;
static AuthCompleteCb auth_complete_callback = NULL;
#define INQ_LEN 0x10
#define INQ_NUM_RSPS 20
#define READY_TIMEOUT (10 * 1000)
#define SCAN_TIMEOUT (INQ_LEN * 2 * 1000)
static esp_bd_addr_t _peer_bd_addr;
static char _remote_name[ESP_BT_GAP_MAX_BDNAME_LEN + 1];
static bool _isRemoteAddressSet;
static bool _isMaster;
static esp_bt_pin_code_t _pin_code;
static int _pin_len;
static bool _isPinSet;
static bool _enableSSP;
static esp_spp_sec_t _sec_mask;
static esp_spp_role_t _role;
// start connect on ESP_SPP_DISCOVERY_COMP_EVT or save entry for getChannels
static bool _doConnect;
static std::map <int, std::string> sdpRecords;
static BTScanResultsSet scanResults;
static BTAdvertisedDeviceCb advertisedDeviceCb = nullptr;
// _spp_event_group
#define SPP_RUNNING 0x01
#define SPP_CONNECTED 0x02
#define SPP_CONGESTED 0x04
// true until OPEN successful, changes to false on CLOSE
#define SPP_DISCONNECTED 0x08
// true until connect(), changes to true on CLOSE
#define SPP_CLOSED 0x10
// _bt_event_group
#define BT_DISCOVERY_RUNNING 0x01
#define BT_DISCOVERY_COMPLETED 0x02
#define BT_SDP_RUNNING 0x04
#define BT_SDP_COMPLETED 0x08
typedef struct {
size_t len;
uint8_t data[];
} spp_packet_t;
#if (ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_INFO)
static char *bda2str(esp_bd_addr_t bda, char *str, size_t size)
{
if (bda == NULL || str == NULL || size < 18) {
return NULL;
}
uint8_t *p = bda;
snprintf(str, size, "%02x:%02x:%02x:%02x:%02x:%02x",
p[0], p[1], p[2], p[3], p[4], p[5]);
return str;
}
#endif
static bool get_name_from_eir(uint8_t *eir, char *bdname, uint8_t *bdname_len)
{
if (!eir || !bdname || !bdname_len) {
return false;
}
uint8_t *rmt_bdname, rmt_bdname_len;
*bdname = *bdname_len = rmt_bdname_len = 0;
rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_CMPL_LOCAL_NAME, &rmt_bdname_len);
if (!rmt_bdname) {
rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_SHORT_LOCAL_NAME, &rmt_bdname_len);
}
if (rmt_bdname) {
rmt_bdname_len = rmt_bdname_len > ESP_BT_GAP_MAX_BDNAME_LEN ? ESP_BT_GAP_MAX_BDNAME_LEN : rmt_bdname_len;
memcpy(bdname, rmt_bdname, rmt_bdname_len);
bdname[rmt_bdname_len] = 0;
*bdname_len = rmt_bdname_len;
return true;
}
return false;
}
static bool btSetPin() {
esp_bt_pin_type_t pin_type;
if (_isPinSet) {
if (_pin_len) {
log_i("pin set");
pin_type = ESP_BT_PIN_TYPE_FIXED;
} else {
_isPinSet = false;
log_i("pin reset");
pin_type = ESP_BT_PIN_TYPE_VARIABLE; // pin_code would be ignored (default)
}
return (esp_bt_gap_set_pin(pin_type, _pin_len, _pin_code) == ESP_OK);
}
return false;
}
static esp_err_t _spp_queue_packet(uint8_t *data, size_t len){
if(!data || !len){
log_w("No data provided");
return ESP_OK;
}
spp_packet_t * packet = (spp_packet_t*)malloc(sizeof(spp_packet_t) + len);
if(!packet){
log_e("SPP TX Packet Malloc Failed!");
return ESP_FAIL;
}
packet->len = len;
memcpy(packet->data, data, len);
if (!_spp_tx_queue || xQueueSend(_spp_tx_queue, &packet, SPP_TX_QUEUE_TIMEOUT) != pdPASS) {
log_e("SPP TX Queue Send Failed!");
free(packet);
return ESP_FAIL;
}
return ESP_OK;
}
const uint16_t SPP_TX_MAX = 330;
static uint8_t _spp_tx_buffer[SPP_TX_MAX];
static uint16_t _spp_tx_buffer_len = 0;
static bool _spp_send_buffer(){
if((xEventGroupWaitBits(_spp_event_group, SPP_CONGESTED, pdFALSE, pdTRUE, SPP_CONGESTED_TIMEOUT) & SPP_CONGESTED) != 0){
if(!_spp_client){
log_v("SPP Client Gone!");
return false;
}
log_v("SPP Write %u", _spp_tx_buffer_len);
esp_err_t err = esp_spp_write(_spp_client, _spp_tx_buffer_len, _spp_tx_buffer);
if(err != ESP_OK){
log_e("SPP Write Failed! [0x%X]", err);
return false;
}
_spp_tx_buffer_len = 0;
if(xSemaphoreTake(_spp_tx_done, SPP_TX_DONE_TIMEOUT) != pdTRUE){
log_e("SPP Ack Failed!");
return false;
}
return true;
}
log_e("SPP Write Congested!");
return false;
}
static void _spp_tx_task(void * arg){
spp_packet_t *packet = NULL;
size_t len = 0, to_send = 0;
uint8_t * data = NULL;
for (;;) {
if(_spp_tx_queue && xQueueReceive(_spp_tx_queue, &packet, portMAX_DELAY) == pdTRUE && packet){
if(packet->len <= (SPP_TX_MAX - _spp_tx_buffer_len)){
memcpy(_spp_tx_buffer+_spp_tx_buffer_len, packet->data, packet->len);
_spp_tx_buffer_len+=packet->len;
free(packet);
packet = NULL;
if(SPP_TX_MAX == _spp_tx_buffer_len || uxQueueMessagesWaiting(_spp_tx_queue) == 0){
_spp_send_buffer();
}
} else {
len = packet->len;
data = packet->data;
to_send = SPP_TX_MAX - _spp_tx_buffer_len;
memcpy(_spp_tx_buffer+_spp_tx_buffer_len, data, to_send);
_spp_tx_buffer_len = SPP_TX_MAX;
data += to_send;
len -= to_send;
if(!_spp_send_buffer()){
len = 0;
}
while(len >= SPP_TX_MAX){
memcpy(_spp_tx_buffer, data, SPP_TX_MAX);
_spp_tx_buffer_len = SPP_TX_MAX;
data += SPP_TX_MAX;
len -= SPP_TX_MAX;
if(!_spp_send_buffer()){
len = 0;
break;
}
}
if(len){
memcpy(_spp_tx_buffer, data, len);
_spp_tx_buffer_len += len;
if(uxQueueMessagesWaiting(_spp_tx_queue) == 0){
_spp_send_buffer();
}
}
free(packet);
packet = NULL;
}
} else {
log_e("Something went horribly wrong");
}
}
vTaskDelete(NULL);
_spp_task_handle = NULL;
}
static void esp_spp_cb(esp_spp_cb_event_t event, esp_spp_cb_param_t *param)
{
switch (event)
{
case ESP_SPP_INIT_EVT:
log_i("ESP_SPP_INIT_EVT");
#ifdef ESP_IDF_VERSION_MAJOR
esp_bt_gap_set_scan_mode(ESP_BT_CONNECTABLE, ESP_BT_GENERAL_DISCOVERABLE);
#else
esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE);
#endif
if (!_isMaster) {
log_i("ESP_SPP_INIT_EVT: slave: start");
esp_spp_start_srv(ESP_SPP_SEC_NONE, ESP_SPP_ROLE_SLAVE, 0, _spp_server_name);
}
xEventGroupSetBits(_spp_event_group, SPP_RUNNING);
break;
case ESP_SPP_SRV_OPEN_EVT://Server connection open
if (param->srv_open.status == ESP_SPP_SUCCESS) {
log_i("ESP_SPP_SRV_OPEN_EVT: %u", _spp_client);
if (!_spp_client){
_spp_client = param->srv_open.handle;
_spp_tx_buffer_len = 0;
} else {
secondConnectionAttempt = true;
esp_spp_disconnect(param->srv_open.handle);
}
xEventGroupClearBits(_spp_event_group, SPP_DISCONNECTED);
xEventGroupSetBits(_spp_event_group, SPP_CONNECTED);
} else {
log_e("ESP_SPP_SRV_OPEN_EVT Failed!, status:%d", param->srv_open.status);
}
break;
case ESP_SPP_CLOSE_EVT://Client connection closed
if ((param->close.async == false && param->close.status == ESP_SPP_SUCCESS) || param->close.async) {
log_i("ESP_SPP_CLOSE_EVT status:%d handle:%d close_by_remote:%d attempt %u", param->close.status,
param->close.handle, param->close.async, secondConnectionAttempt);
if(secondConnectionAttempt) {
secondConnectionAttempt = false;
} else {
_spp_client = 0;
xEventGroupSetBits(_spp_event_group, SPP_DISCONNECTED);
xEventGroupSetBits(_spp_event_group, SPP_CONGESTED);
xEventGroupSetBits(_spp_event_group, SPP_CLOSED);
xEventGroupClearBits(_spp_event_group, SPP_CONNECTED);
}
} else {
log_e("ESP_SPP_CLOSE_EVT failed!, status:%d", param->close.status);
}
break;
case ESP_SPP_CONG_EVT://connection congestion status changed
if(param->cong.cong){
xEventGroupClearBits(_spp_event_group, SPP_CONGESTED);
} else {
xEventGroupSetBits(_spp_event_group, SPP_CONGESTED);
}
log_v("ESP_SPP_CONG_EVT: %s", param->cong.cong?"CONGESTED":"FREE");
break;
case ESP_SPP_WRITE_EVT://write operation completed
if (param->write.status == ESP_SPP_SUCCESS) {
if(param->write.cong){
xEventGroupClearBits(_spp_event_group, SPP_CONGESTED);
}
log_v("ESP_SPP_WRITE_EVT: %u %s", param->write.len, param->write.cong?"CONGESTED":"");
} else {
log_e("ESP_SPP_WRITE_EVT failed!, status:%d", param->write.status);
}
xSemaphoreGive(_spp_tx_done);//we can try to send another packet
break;
case ESP_SPP_DATA_IND_EVT://connection received data
log_v("ESP_SPP_DATA_IND_EVT len=%d handle=%d", param->data_ind.len, param->data_ind.handle);
//esp_log_buffer_hex("",param->data_ind.data,param->data_ind.len); //for low level debug
//ets_printf("r:%u\n", param->data_ind.len);
if(custom_data_callback){
custom_data_callback(param->data_ind.data, param->data_ind.len);
} else if (_spp_rx_queue != NULL){
for (int i = 0; i < param->data_ind.len; i++){
if(xQueueSend(_spp_rx_queue, param->data_ind.data + i, (TickType_t)0) != pdTRUE){
log_e("RX Full! Discarding %u bytes", param->data_ind.len - i);
break;
}
}
}
break;
case ESP_SPP_DISCOVERY_COMP_EVT://discovery complete
log_i("ESP_SPP_DISCOVERY_COMP_EVT num=%d", param->disc_comp.scn_num);
if (param->disc_comp.status == ESP_SPP_SUCCESS) {
for(int i=0; i < param->disc_comp.scn_num; i++) {
log_d("ESP_SPP_DISCOVERY_COMP_EVT: spp [%d] channel: %d service name:%s", i, param->disc_comp.scn[i], param->disc_comp.service_name[0]);
}
if(_doConnect) {
if(param->disc_comp.scn_num > 0) {
#if (ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_INFO)
char bda_str[18];
log_i("ESP_SPP_DISCOVERY_COMP_EVT: spp connect to remote %s channel %d",
bda2str(_peer_bd_addr, bda_str, sizeof(bda_str)),
param->disc_comp.scn[0]);
#endif
xEventGroupClearBits(_spp_event_group, SPP_CLOSED);
if(esp_spp_connect(_sec_mask, _role, param->disc_comp.scn[0], _peer_bd_addr) != ESP_OK) {
log_e("ESP_SPP_DISCOVERY_COMP_EVT connect failed");
xEventGroupSetBits(_spp_event_group, SPP_CLOSED);
}
} else {
log_e("ESP_SPP_DISCOVERY_COMP_EVT remote doesn't offer an SPP channel");
xEventGroupSetBits(_spp_event_group, SPP_CLOSED);
}
} else {
for(int i=0; i < param->disc_comp.scn_num; i++) {
sdpRecords[param->disc_comp.scn[i]] = param->disc_comp.service_name[0];
}
}
} else {
log_e("ESP_SPP_DISCOVERY_COMP_EVT failed!, status:%d", param->disc_comp.status);
}
xEventGroupSetBits(_bt_event_group, BT_SDP_COMPLETED);
break;
case ESP_SPP_OPEN_EVT://Client connection open
log_i("ESP_SPP_OPEN_EVT");
if (!_spp_client){
_spp_client = param->open.handle;
} else {
secondConnectionAttempt = true;
esp_spp_disconnect(param->open.handle);
}
xEventGroupClearBits(_spp_event_group, SPP_DISCONNECTED);
xEventGroupSetBits(_spp_event_group, SPP_CONNECTED);
xEventGroupSetBits(_spp_event_group, SPP_CONGESTED);
break;
case ESP_SPP_START_EVT://server started
log_i("ESP_SPP_START_EVT");
break;
case ESP_SPP_CL_INIT_EVT://client initiated a connection
if (param->cl_init.status == ESP_SPP_SUCCESS) {
log_i("ESP_SPP_CL_INIT_EVT handle:%d sec_id:%d", param->cl_init.handle, param->cl_init.sec_id);
} else {
log_i("ESP_SPP_CL_INIT_EVT status:%d", param->cl_init.status);
}
break;
default:
log_i("ESP_SPP_* event unhandled %d", event);
break;
}
if(custom_spp_callback)(*custom_spp_callback)(event, param);
}
void BluetoothSerial::onData(BluetoothSerialDataCb cb){
custom_data_callback = cb;
}
static void esp_bt_gap_cb(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param)
{
switch(event){
case ESP_BT_GAP_DISC_RES_EVT: {
log_i("ESP_BT_GAP_DISC_RES_EVT properties=%d", param->disc_res.num_prop);
#if (ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_INFO)
char bda_str[18];
log_i("Scanned device: %s", bda2str(param->disc_res.bda, bda_str, 18));
#endif
BTAdvertisedDeviceSet advertisedDevice;
uint8_t peer_bdname_len = 0;
char peer_bdname[ESP_BT_GAP_MAX_BDNAME_LEN + 1];
for (int i = 0; i < param->disc_res.num_prop; i++) {
switch(param->disc_res.prop[i].type) {
case ESP_BT_GAP_DEV_PROP_EIR:
if (get_name_from_eir((uint8_t*)param->disc_res.prop[i].val, peer_bdname, &peer_bdname_len)) {
log_i("ESP_BT_GAP_DISC_RES_EVT : EIR : %s : %d", peer_bdname, peer_bdname_len);
if (strlen(_remote_name) == peer_bdname_len
&& strncmp(peer_bdname, _remote_name, peer_bdname_len) == 0) {
log_v("ESP_BT_GAP_DISC_RES_EVT : SPP_START_DISCOVERY_EIR : %s", peer_bdname, peer_bdname_len);
_isRemoteAddressSet = true;
memcpy(_peer_bd_addr, param->disc_res.bda, ESP_BD_ADDR_LEN);
esp_bt_gap_cancel_discovery();
esp_spp_start_discovery(_peer_bd_addr);
}
}
break;
case ESP_BT_GAP_DEV_PROP_BDNAME:
peer_bdname_len = param->disc_res.prop[i].len;
memcpy(peer_bdname, param->disc_res.prop[i].val, peer_bdname_len);
peer_bdname_len--; // len includes 0 terminator
log_v("ESP_BT_GAP_DISC_RES_EVT : BDNAME : %s : %d", peer_bdname, peer_bdname_len);
if (strlen(_remote_name) == peer_bdname_len
&& strncmp(peer_bdname, _remote_name, peer_bdname_len) == 0) {
log_i("ESP_BT_GAP_DISC_RES_EVT : SPP_START_DISCOVERY_BDNAME : %s", peer_bdname);
_isRemoteAddressSet = true;
memcpy(_peer_bd_addr, param->disc_res.bda, ESP_BD_ADDR_LEN);
esp_bt_gap_cancel_discovery();
esp_spp_start_discovery(_peer_bd_addr);
}
break;
case ESP_BT_GAP_DEV_PROP_COD:
if (param->disc_res.prop[i].len <= sizeof(int)) {
uint32_t cod = 0;
memcpy(&cod, param->disc_res.prop[i].val, param->disc_res.prop[i].len);
advertisedDevice.setCOD(cod);
log_d("ESP_BT_GAP_DEV_PROP_COD 0x%x", cod);
} else {
log_d("ESP_BT_GAP_DEV_PROP_COD invalid COD: Value size larger than integer");
}
break;
case ESP_BT_GAP_DEV_PROP_RSSI:
if (param->disc_res.prop[i].len <= sizeof(int)) {
uint8_t rssi = 0;
memcpy(&rssi, param->disc_res.prop[i].val, param->disc_res.prop[i].len);
log_d("ESP_BT_GAP_DEV_PROP_RSSI %d", rssi);
advertisedDevice.setRSSI(rssi);
} else {
log_d("ESP_BT_GAP_DEV_PROP_RSSI invalid RSSI: Value size larger than integer");
}
break;
default:
log_i("ESP_BT_GAP_DISC_RES_EVT unknown property [%d]:type:%d", i, param->disc_res.prop[i].type);
break;
}
if (_isRemoteAddressSet)
break;
}
if (peer_bdname_len)
advertisedDevice.setName(peer_bdname);
esp_bd_addr_t addr;
memcpy(addr, param->disc_res.bda, ESP_BD_ADDR_LEN);
advertisedDevice.setAddress(BTAddress(addr));
if (scanResults.add(advertisedDevice) && advertisedDeviceCb)
advertisedDeviceCb(&advertisedDevice);
}
break;
case ESP_BT_GAP_DISC_STATE_CHANGED_EVT:
if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STOPPED) {
log_i("ESP_BT_GAP_DISC_STATE_CHANGED_EVT stopped");
xEventGroupClearBits(_bt_event_group, BT_DISCOVERY_RUNNING);
xEventGroupSetBits(_bt_event_group, BT_DISCOVERY_COMPLETED);
} else { // ESP_BT_GAP_DISCOVERY_STARTED
log_i("ESP_BT_GAP_DISC_STATE_CHANGED_EVT started");
xEventGroupClearBits(_bt_event_group, BT_DISCOVERY_COMPLETED);
xEventGroupSetBits(_bt_event_group, BT_DISCOVERY_RUNNING);
}
break;
case ESP_BT_GAP_RMT_SRVCS_EVT:
log_i( "ESP_BT_GAP_RMT_SRVCS_EVT: status = %d, num_uuids = %d", param->rmt_srvcs.stat, param->rmt_srvcs.num_uuids);
break;
case ESP_BT_GAP_RMT_SRVC_REC_EVT:
log_i("ESP_BT_GAP_RMT_SRVC_REC_EVT: status = %d", param->rmt_srvc_rec.stat);
break;
case ESP_BT_GAP_AUTH_CMPL_EVT:
if (param->auth_cmpl.stat == ESP_BT_STATUS_SUCCESS) {
log_v("authentication success: %s", param->auth_cmpl.device_name);
if (auth_complete_callback) {
auth_complete_callback(true);
}
} else {
log_e("authentication failed, status:%d", param->auth_cmpl.stat);
if (auth_complete_callback) {
auth_complete_callback(false);
}
}
break;
case ESP_BT_GAP_PIN_REQ_EVT:
// default pairing pins
log_i("ESP_BT_GAP_PIN_REQ_EVT min_16_digit:%d", param->pin_req.min_16_digit);
if (param->pin_req.min_16_digit) {
log_i("Input pin code: 0000 0000 0000 0000");
esp_bt_pin_code_t pin_code;
memset(pin_code, '0', ESP_BT_PIN_CODE_LEN);
esp_bt_gap_pin_reply(param->pin_req.bda, true, 16, pin_code);
} else {
log_i("Input pin code: 1234");
esp_bt_pin_code_t pin_code;
memcpy(pin_code, "1234", 4);
esp_bt_gap_pin_reply(param->pin_req.bda, true, 4, pin_code);
}
break;
case ESP_BT_GAP_CFM_REQ_EVT:
log_i("ESP_BT_GAP_CFM_REQ_EVT Please compare the numeric value: %d", param->cfm_req.num_val);
if (confirm_request_callback) {
memcpy(current_bd_addr, param->cfm_req.bda, sizeof(esp_bd_addr_t));
confirm_request_callback(param->cfm_req.num_val);
}
else {
esp_bt_gap_ssp_confirm_reply(param->cfm_req.bda, true);
}
break;
case ESP_BT_GAP_KEY_NOTIF_EVT:
log_i("ESP_BT_GAP_KEY_NOTIF_EVT passkey:%d", param->key_notif.passkey);
break;
case ESP_BT_GAP_KEY_REQ_EVT:
log_i("ESP_BT_GAP_KEY_REQ_EVT Please enter passkey!");
break;
case ESP_BT_GAP_CONFIG_EIR_DATA_EVT:
log_i("ESP_BT_GAP_CONFIG_EIR_DATA_EVT: stat:%d num:%d", param->config_eir_data.stat, param->config_eir_data.eir_type_num);
break;
case ESP_BT_GAP_READ_REMOTE_NAME_EVT:
if (param->read_rmt_name.stat == ESP_BT_STATUS_SUCCESS ) {
log_i("ESP_BT_GAP_READ_REMOTE_NAME_EVT: %s", param->read_rmt_name.rmt_name);
} else {
log_i("ESP_BT_GAP_READ_REMOTE_NAME_EVT: no success stat:%d", param->read_rmt_name.stat);
}
break;
case ESP_BT_GAP_MODE_CHG_EVT:
log_i("ESP_BT_GAP_MODE_CHG_EVT: mode: %d", param->mode_chg.mode);
break;
default:
log_i("ESP-BT_GAP_* unknown message: %d", event);
break;
}
}
static bool _init_bt(const char *deviceName)
{
if(!_bt_event_group){
_bt_event_group = xEventGroupCreate();
if(!_bt_event_group){
log_e("BT Event Group Create Failed!");
return false;
}
xEventGroupClearBits(_bt_event_group, 0xFFFFFF);
}
if(!_spp_event_group){
_spp_event_group = xEventGroupCreate();
if(!_spp_event_group){
log_e("SPP Event Group Create Failed!");
return false;
}
xEventGroupClearBits(_spp_event_group, 0xFFFFFF);
xEventGroupSetBits(_spp_event_group, SPP_CONGESTED);
xEventGroupSetBits(_spp_event_group, SPP_DISCONNECTED);
xEventGroupSetBits(_spp_event_group, SPP_CLOSED);
}
if (_spp_rx_queue == NULL){
_spp_rx_queue = xQueueCreate(RX_QUEUE_SIZE, sizeof(uint8_t)); //initialize the queue
if (_spp_rx_queue == NULL){
log_e("RX Queue Create Failed");
return false;
}
}
if (_spp_tx_queue == NULL){
_spp_tx_queue = xQueueCreate(TX_QUEUE_SIZE, sizeof(spp_packet_t*)); //initialize the queue
if (_spp_tx_queue == NULL){
log_e("TX Queue Create Failed");
return false;
}
}
if(_spp_tx_done == NULL){
_spp_tx_done = xSemaphoreCreateBinary();
if (_spp_tx_done == NULL){
log_e("TX Semaphore Create Failed");
return false;
}
xSemaphoreTake(_spp_tx_done, 0);
}
if(!_spp_task_handle){
xTaskCreatePinnedToCore(_spp_tx_task, "spp_tx", 4096, NULL, 10, &_spp_task_handle, 0);
if(!_spp_task_handle){
log_e("Network Event Task Start Failed!");
return false;
}
}
if (!btStarted() && !btStart()){
log_e("initialize controller failed");
return false;
}
esp_bluedroid_status_t bt_state = esp_bluedroid_get_status();
if (bt_state == ESP_BLUEDROID_STATUS_UNINITIALIZED){
if (esp_bluedroid_init()) {
log_e("initialize bluedroid failed");
return false;
}
}
if (bt_state != ESP_BLUEDROID_STATUS_ENABLED){
if (esp_bluedroid_enable()) {
log_e("enable bluedroid failed");
return false;
}
}
// Why only master need this? Slave need this during pairing as well
// if (_isMaster && esp_bt_gap_register_callback(esp_bt_gap_cb) != ESP_OK) {
if (esp_bt_gap_register_callback(esp_bt_gap_cb) != ESP_OK) {
log_e("gap register failed");
return false;
}
if (esp_spp_register_callback(esp_spp_cb) != ESP_OK){
log_e("spp register failed");
return false;
}
if (esp_spp_init(ESP_SPP_MODE_CB) != ESP_OK){
log_e("spp init failed");
return false;
}
// if (esp_bt_sleep_disable() != ESP_OK){
// log_e("esp_bt_sleep_disable failed");
// }
log_i("device name set");
esp_bt_dev_set_device_name(deviceName);
if (_isPinSet) {
log_i("pin set");
btSetPin();
}
if (_enableSSP) {
log_i("Simple Secure Pairing");
esp_bt_sp_param_t param_type = ESP_BT_SP_IOCAP_MODE;
esp_bt_io_cap_t iocap = ESP_BT_IO_CAP_IO;
esp_bt_gap_set_security_param(param_type, &iocap, sizeof(uint8_t));
}
// the default BTA_DM_COD_LOUDSPEAKER does not work with the macOS BT stack
esp_bt_cod_t cod;
cod.major = 0b00001;
cod.minor = 0b000100;
cod.service = 0b00000010110;
if (esp_bt_gap_set_cod(cod, ESP_BT_INIT_COD) != ESP_OK) {
log_e("set cod failed");
return false;
}
return true;
}
static bool _stop_bt()
{
if (btStarted()){
if(_spp_client)
esp_spp_disconnect(_spp_client);
esp_spp_deinit();
esp_bluedroid_disable();
esp_bluedroid_deinit();
btStop();
}
_spp_client = 0;
if(_spp_task_handle){
vTaskDelete(_spp_task_handle);
_spp_task_handle = NULL;
}
if(_spp_event_group){
vEventGroupDelete(_spp_event_group);
_spp_event_group = NULL;
}
if(_spp_rx_queue){
vQueueDelete(_spp_rx_queue);
//ToDo: clear RX queue when in packet mode
_spp_rx_queue = NULL;
}
if(_spp_tx_queue){
spp_packet_t *packet = NULL;
while(xQueueReceive(_spp_tx_queue, &packet, 0) == pdTRUE){
free(packet);
}
vQueueDelete(_spp_tx_queue);
_spp_tx_queue = NULL;
}
if (_spp_tx_done) {
vSemaphoreDelete(_spp_tx_done);
_spp_tx_done = NULL;
}
if (_bt_event_group) {
vEventGroupDelete(_bt_event_group);
_bt_event_group = NULL;
}
return true;
}
static bool waitForConnect(int timeout) {
TickType_t xTicksToWait = timeout / portTICK_PERIOD_MS;
// wait for connected or closed
EventBits_t rc = xEventGroupWaitBits(_spp_event_group, SPP_CONNECTED | SPP_CLOSED, pdFALSE, pdFALSE, xTicksToWait);
if((rc & SPP_CONNECTED) != 0)
return true;
else if((rc & SPP_CLOSED) != 0) {
log_d("connection closed!");
return false;
}
log_d("timeout");
return false;
}
static bool waitForDiscovered(int timeout) {
TickType_t xTicksToWait = timeout / portTICK_PERIOD_MS;
return (xEventGroupWaitBits(_spp_event_group, BT_DISCOVERY_COMPLETED, pdFALSE, pdTRUE, xTicksToWait) & BT_DISCOVERY_COMPLETED) != 0;
}
static bool waitForSDPRecord(int timeout) {
TickType_t xTicksToWait = timeout / portTICK_PERIOD_MS;
return (xEventGroupWaitBits(_bt_event_group, BT_SDP_COMPLETED, pdFALSE, pdTRUE, xTicksToWait) & BT_SDP_COMPLETED) != 0;
}
/*
* Serial Bluetooth Arduino
*
* */
BluetoothSerial::BluetoothSerial()
{
local_name = "ESP32"; //default bluetooth name
}
BluetoothSerial::~BluetoothSerial(void)
{
_stop_bt();
}
/**
* @Param isMaster set to true if you want to connect to an other device
*/
bool BluetoothSerial::begin(String localName, bool isMaster)
{
_isMaster = isMaster;
if (localName.length()){
local_name = localName;
}
return _init_bt(local_name.c_str());
}
int BluetoothSerial::available(void)
{
if (_spp_rx_queue == NULL){
return 0;
}
return uxQueueMessagesWaiting(_spp_rx_queue);
}
int BluetoothSerial::peek(void)
{
uint8_t c;
if (_spp_rx_queue && xQueuePeek(_spp_rx_queue, &c, this->timeoutTicks)){
return c;
}
return -1;
}
bool BluetoothSerial::hasClient(void)
{
return _spp_client > 0;
}
int BluetoothSerial::read()
{
uint8_t c = 0;
if (_spp_rx_queue && xQueueReceive(_spp_rx_queue, &c, this->timeoutTicks)){
return c;
}
return -1;
}
/**
* Set timeout for read / peek
*/
void BluetoothSerial::setTimeout(int timeoutMS)
{
this->timeoutTicks=timeoutMS / portTICK_PERIOD_MS;
}
size_t BluetoothSerial::write(uint8_t c)
{
return write(&c, 1);
}
size_t BluetoothSerial::write(const uint8_t *buffer, size_t size)
{
if (!_spp_client){
return 0;
}
return (_spp_queue_packet((uint8_t *)buffer, size) == ESP_OK) ? size : 0;
}
void BluetoothSerial::flush()
{
if (_spp_tx_queue != NULL){
while(uxQueueMessagesWaiting(_spp_tx_queue) > 0){
delay(100);
}
}
}
void BluetoothSerial::end()
{
_stop_bt();
}
void BluetoothSerial::onConfirmRequest(ConfirmRequestCb cb)
{
confirm_request_callback = cb;
}
void BluetoothSerial::onAuthComplete(AuthCompleteCb cb)
{
auth_complete_callback = cb;
}
void BluetoothSerial::confirmReply(boolean confirm)
{
esp_bt_gap_ssp_confirm_reply(current_bd_addr, confirm);
}
esp_err_t BluetoothSerial::register_callback(esp_spp_cb_t * callback)
{
custom_spp_callback = callback;
return ESP_OK;
}
//Simple Secure Pairing
void BluetoothSerial::enableSSP() {
_enableSSP = true;
}
/*
* Set default parameters for Legacy Pairing
* Use fixed pin code
*/
bool BluetoothSerial::setPin(const char *pin) {
log_i("pin: %s", pin);
bool isEmpty = !(pin && *pin);
if (isEmpty && !_isPinSet) {
return true; // nothing to do
} else if (!isEmpty){
_pin_len = strlen(pin);
memcpy(_pin_code, pin, _pin_len);
} else {
_pin_len = 0; // resetting pin to none (default)
}
_pin_code[_pin_len] = 0;
_isPinSet = true;
if (isReady(false, READY_TIMEOUT)) {
btSetPin();
}
return true;
}
bool BluetoothSerial::connect(String remoteName)
{
bool retval = false;
if (!isReady(true, READY_TIMEOUT)) return false;
if (remoteName && remoteName.length() < 1) {
log_e("No remote name is provided");
return false;
}
disconnect();
_doConnect = true;
_isRemoteAddressSet = false;
_sec_mask = ESP_SPP_SEC_ENCRYPT|ESP_SPP_SEC_AUTHENTICATE;
_role = ESP_SPP_ROLE_MASTER;
strncpy(_remote_name, remoteName.c_str(), ESP_BT_GAP_MAX_BDNAME_LEN);
_remote_name[ESP_BT_GAP_MAX_BDNAME_LEN] = 0;
log_i("master : remoteName");
// will first resolve name to address
#ifdef ESP_IDF_VERSION_MAJOR
esp_bt_gap_set_scan_mode(ESP_BT_CONNECTABLE, ESP_BT_GENERAL_DISCOVERABLE);
#else
esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE);
#endif
xEventGroupClearBits(_spp_event_group, SPP_CLOSED);
if (esp_bt_gap_start_discovery(ESP_BT_INQ_MODE_GENERAL_INQUIRY, INQ_LEN, INQ_NUM_RSPS) == ESP_OK) {
retval = waitForConnect(SCAN_TIMEOUT);
}
if (retval == false) {
_isRemoteAddressSet = false;
}
return retval;
}
/**
* @Param channel: specify channel or 0 for auto-detect
* @Param sec_mask:
* ESP_SPP_SEC_ENCRYPT|ESP_SPP_SEC_AUTHENTICATE
* ESP_SPP_SEC_NONE
* @Param role:
* ESP_SPP_ROLE_MASTER master can handle up to 7 connections to slaves
* ESP_SPP_ROLE_SLAVE can only have one connection to a master
*/
bool BluetoothSerial::connect(uint8_t remoteAddress[], int channel, esp_spp_sec_t sec_mask, esp_spp_role_t role)
{
bool retval = false;
if (!isReady(true, READY_TIMEOUT)) return false;
if (!remoteAddress) {
log_e("No remote address is provided");
return false;
}
disconnect();
_doConnect = true;
_remote_name[0] = 0;
_isRemoteAddressSet = true;
_sec_mask = sec_mask;
_role = role;
memcpy(_peer_bd_addr, remoteAddress, ESP_BD_ADDR_LEN);
log_i("master : remoteAddress");
xEventGroupClearBits(_spp_event_group, SPP_CLOSED);
if (channel > 0) {
#if (ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_INFO)
char bda_str[18];
log_i("spp connect to remote %s channel %d",
bda2str(_peer_bd_addr, bda_str, sizeof(bda_str)),
channel);
#endif
if(esp_spp_connect(sec_mask, role, channel, _peer_bd_addr) != ESP_OK ) {
log_e("spp connect failed");
retval = false;
} else {
retval = waitForConnect(READY_TIMEOUT);
if(retval) {
log_i("connected");
} else {
if(this->isClosed()) {
log_e("connect failed");
} else {
log_e("connect timed out after %dms", READY_TIMEOUT);
}