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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 "BTAdvertisedDevice.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 QueueHandle_t _spp_rx_queue = NULL;
static QueueHandle_t _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 KeyRequestCb key_request_callback = NULL;
static AuthCompleteCb auth_complete_callback = NULL;
static bool _rmt_name_valid = false;
static uint8_t _rmt_name[ESP_BT_GAP_MAX_BDNAME_LEN + 1] = {0};
#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 bool _enableSSP;
static bool _IO_CAP_INPUT;
static bool _IO_CAP_OUTPUT;
esp_bt_pin_code_t _pin_code = {0};
uint8_t _pin_code_len = 0; // Number of valid Bytes in the esp_bt_pin_code_t array
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 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: // Enum 0 - When SPP is initialized
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
log_i("ESP_SPP_INIT_EVT: %s: start", _isMaster ? "master" : "slave");
esp_spp_start_srv(ESP_SPP_SEC_NONE, _isMaster ? ESP_SPP_ROLE_MASTER : ESP_SPP_ROLE_SLAVE, 0, _spp_server_name);
xEventGroupSetBits(_spp_event_group, SPP_RUNNING);
break;
case ESP_SPP_UNINIT_EVT: // Enum 1 - When SPP is deinitialized
log_i("ESP_SPP_UNINIT_EVT: SPP is deinitialized");
break;
case ESP_SPP_DISCOVERY_COMP_EVT: // Enum 8 - When SDP 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: // Enum 26 - When SPP 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_CLOSE_EVT: // Enum 27 - When SPP 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_START_EVT: // Enum 28 - When SPP server started
log_i("ESP_SPP_START_EVT");
break;
case ESP_SPP_CL_INIT_EVT: // Enum 29 - When SPP 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;
case ESP_SPP_DATA_IND_EVT: // Enum 30 - When SPP connection received data, only for ESP_SPP_MODE_CB
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_CONG_EVT: // Enum 31 - When SPP connection congestion status changed, only for ESP_SPP_MODE_CB
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: // Enum 33 - When SPP write operation completes, only for ESP_SPP_MODE_CB
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_SRV_OPEN_EVT: // Enum 34 - When SPP 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_SRV_STOP_EVT: // Enum 35 - When SPP server stopped
log_i("ESP_SPP_SRV_STOP_EVT");
break;
case ESP_SPP_VFS_REGISTER_EVT: // Enum 36 - When SPP VFS register
log_i("ESP_SPP_VFS_REGISTER_EVT");
break;
case ESP_SPP_VFS_UNREGISTER_EVT: // Enum 37 - When SPP VFS unregister
log_i("ESP_SPP_VFS_UNREGISTER_EVT");
break;
default: log_i("ESP_SPP_* event #%d unhandled", 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:
{ // Enum 0 - Device discovery result event
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_BDNAME: // Enum 1 - Bluetooth device name, value type is int8_t []
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: // Enum 2 - Class of Device, value type is uint32_t
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: // Enum 3 - Received Signal strength Indication, value type is int8_t, ranging from -128 to 127
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;
case ESP_BT_GAP_DEV_PROP_EIR: // Enum 4 - Extended Inquiry Response, value type is uint8_t []
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;
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: // Enum 1 - Discovery state changed event
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: // Enum 2 - Get remote services event
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: // Enum 3 - Get remote service record event
log_i("ESP_BT_GAP_RMT_SRVC_REC_EVT: status = %d", param->rmt_srvc_rec.stat);
break;
case ESP_BT_GAP_AUTH_CMPL_EVT: // Enum 4 - Authentication complete event
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: // Enum 5 - Legacy Pairing Pin code request
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 && _pin_code_len < 16) {
esp_bt_gap_pin_reply(param->pin_req.bda, false, 0, NULL);
} else {
//log_i("Input pin code: \"%s\"=0x%x", _pin_code);
log_i("Input pin code: \"%.*s\"=0x%x", _pin_code_len, _pin_code, *(int *)_pin_code);
esp_bt_gap_pin_reply(param->pin_req.bda, true, _pin_code_len, _pin_code);
}
break;
case ESP_BT_GAP_CFM_REQ_EVT: // Enum 6 - Security Simple Pairing User Confirmation request.
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 {
log_w("ESP_BT_GAP_CFM_REQ_EVT: confirm_request_callback does not exist - refusing pairing");
esp_bt_gap_ssp_confirm_reply(param->cfm_req.bda, false);
}
break;
case ESP_BT_GAP_KEY_NOTIF_EVT: // Enum 7 - Security Simple Pairing Passkey Notification
log_i("ESP_BT_GAP_KEY_NOTIF_EVT passkey:%d", param->key_notif.passkey);
break;
case ESP_BT_GAP_KEY_REQ_EVT: // Enum 8 - Security Simple Pairing Passkey request
log_i("ESP_BT_GAP_KEY_REQ_EVT Please enter passkey!");
if (key_request_callback) {
memcpy(current_bd_addr, param->cfm_req.bda, sizeof(esp_bd_addr_t));
key_request_callback();
} else {
log_w("ESP_BT_GAP_KEY_REQ_EVT: key_request_callback does not exist - refuseing pairing");
esp_bt_gap_ssp_confirm_reply(param->cfm_req.bda, false);
}
break;
case ESP_BT_GAP_READ_RSSI_DELTA_EVT: // Enum 9 - Read rssi event
log_i("ESP_BT_GAP_READ_RSSI_DELTA_EVT Read rssi event");
break;
case ESP_BT_GAP_CONFIG_EIR_DATA_EVT: // Enum 10 - Config EIR data event
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_SET_AFH_CHANNELS_EVT: // Enum 11 - Set AFH channels event
log_i("ESP_BT_GAP_SET_AFH_CHANNELS_EVT Set AFH channels event");
break;
case ESP_BT_GAP_READ_REMOTE_NAME_EVT: // Enum 12 - Read Remote Name event
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);
memcpy(_rmt_name, param->read_rmt_name.rmt_name, ESP_BT_GAP_MAX_BDNAME_LEN + 1);
_rmt_name_valid = true;
} 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: // Enum 13
log_i("ESP_BT_GAP_MODE_CHG_EVT: mode: %d", param->mode_chg.mode);
break;
case ESP_BT_GAP_REMOVE_BOND_DEV_COMPLETE_EVT: // Enum - 14 remove bond device complete event
log_i("ESP_BT_GAP_REMOVE_BOND_DEV_COMPLETE_EVT remove bond device complete event");
break;
case ESP_BT_GAP_QOS_CMPL_EVT: // Enum 15 - QOS complete event
log_i("ESP_BT_GAP_QOS_CMPL_EVT QOS complete event");
break;
case ESP_BT_GAP_ACL_CONN_CMPL_STAT_EVT: // Enum 16 - ACL connection complete status event
log_i("ESP_BT_GAP_ACL_CONN_CMPL_STAT_EVT ACL connection complete status event");
break;
case ESP_BT_GAP_ACL_DISCONN_CMPL_STAT_EVT: // Enum 17 - ACL disconnection complete status event
log_i(
"ESP_BT_GAP_ACL_DISCONN_CMPL_STAT_EVT ACL disconnection complete status event: reason %d, handle %d", param->acl_disconn_cmpl_stat.reason,
param->acl_disconn_cmpl_stat.handle
);
break;
default: log_i("ESP-BT_GAP_* unknown message: %d", event); break;
}
}
static bool _init_bt(const char *deviceName, bt_mode mode) {
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, configMAX_PRIORITIES - 1, &_spp_task_handle, 0);
if (!_spp_task_handle) {
log_e("Network Event Task Start Failed!");
return false;
}
}
if (!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;
}
}
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;
}
esp_spp_cfg_t cfg = BT_SPP_DEFAULT_CONFIG();
cfg.mode = ESP_SPP_MODE_CB;
if (esp_spp_enhanced_init(&cfg) != ESP_OK) {
log_e("spp init failed");
return false;
}
log_i("device name set");
esp_bt_gap_set_device_name(deviceName);
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;
if (_IO_CAP_INPUT && _IO_CAP_OUTPUT) {
iocap = ESP_BT_IO_CAP_IO; // Display with prompt
} else if (!_IO_CAP_INPUT && _IO_CAP_OUTPUT) {
iocap = ESP_BT_IO_CAP_OUT; // DisplayOnly
} else if (_IO_CAP_INPUT && !_IO_CAP_OUTPUT) {
iocap = ESP_BT_IO_CAP_IN; // Input only
} else if (!_IO_CAP_INPUT && !_IO_CAP_OUTPUT) {
iocap = ESP_BT_IO_CAP_NONE; // No input/output
}
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 (btStart()) {
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
* @param disableBLE if BLE is not used, its ram can be freed to get +10kB free ram
*/
bool BluetoothSerial::begin(String localName, bool isMaster, bool disableBLE) {
_isMaster = isMaster;
if (localName.length()) {
local_name = localName;
}
return _init_bt(local_name.c_str(), disableBLE ? BT_MODE_CLASSIC_BT : BT_MODE_BTDM);
}
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) {
Stream::setTimeout(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(2);
}
}
}
void BluetoothSerial::end() {
_stop_bt();
}
/**
* free additional ~30kB ram, reset is required to enable BT again
*/
void BluetoothSerial::memrelease() {
esp_bt_mem_release(ESP_BT_MODE_BTDM);
}
void BluetoothSerial::onConfirmRequest(ConfirmRequestCb cb) {
confirm_request_callback = cb;
}
void BluetoothSerial::onKeyRequest(KeyRequestCb cb) {
key_request_callback = cb;
}
void BluetoothSerial::respondPasskey(uint32_t passkey) {
esp_bt_gap_ssp_passkey_reply(current_bd_addr, true, passkey);
}
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;
}
// Enable Simple Secure Pairing (using generated PIN)
// This must be called before calling begin, otherwise has no effect!
void BluetoothSerial::enableSSP() {
if (isReady(false, READY_TIMEOUT)) {
log_i("Attempted to enable SSP for already initialized driver. Restart to take effect with end() followed by begin()");
return;
}
_enableSSP = true;
_IO_CAP_INPUT = true;
_IO_CAP_OUTPUT = true;
}
// Enable Simple Secure Pairing (using generated PIN)
// This must be called before calling begin, otherwise has no effect!
// Behavior description:
// When both Input and Output are false only the other device authenticates pairing without any pin.
// When Output is true and Input is false only the other device authenticates pairing without any pin.
// When both Input and Output are true both devices display randomly generated code and if they match authenticate pairing on both devices
// - This must be implemented by registering callback via onConfirmRequest() and in this callback request user input and call confirmReply(true); if the authenticated
// otherwise call `confirmReply(false)` to reject the pairing.
// When Input is true and Output is false User will be required to input the passkey to the ESP32 device to authenticate.
// - This must be implemented by registering callback via onKeyRequest() and in this callback the entered passkey will be responded via respondPasskey(passkey);
void BluetoothSerial::enableSSP(bool inputCpability, bool outputCapability) {
log_i("Enabling SSP: input capability=%d; output capability=%d", inputCpability, outputCapability);
_enableSSP = true;
_IO_CAP_INPUT = inputCpability;
_IO_CAP_OUTPUT = outputCapability;
}
// Disable Simple Secure Pairing (using generated PIN)
// This must be called before calling begin, otherwise has no effect!
void BluetoothSerial::disableSSP() {
_enableSSP = false;
}
bool BluetoothSerial::setPin(const char *pin, uint8_t pin_code_len) {
if (pin_code_len == 0 || pin_code_len > 16) {
log_e("PIN code must be 1-16 Bytes long! Called with length %d", pin_code_len);
return false;
}
_pin_code_len = pin_code_len;
memcpy(_pin_code, pin, pin_code_len);
return (esp_bt_gap_set_pin(ESP_BT_PIN_TYPE_FIXED, _pin_code_len, _pin_code) == ESP_OK);
}
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 = true;
_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;
}
/**
* Connect to an other bluetooth device
*
* @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