ESP32/8266 蓝牙配网 Blufi 开源

概览

BluFi 是一款基于蓝牙通道的 Wi-Fi 网络配置功能，适用于 ESP32。它通过安全协议将 Wi-Fi 配置和证书传输到 ESP32，然后 ESP32 可基于这些信息连接到 AP 或建立 SoftAP。

用户可按需自定义用于对称加密、非对称加密和校验的算法。这里我们采用 DH 算法进行密钥协商、128-AES 算法用于数据加密、CRC16 算法用于校验和验证。

BluFi 流程

BluFi 配网功能包含配置 SoftAP 和 Station 两部分。

下面以配置 Station 为例说明配置步骤。 BluFi 配网的配置 Station 包含广播、连接、服务发现、协商共享密钥、传输数据、回传连接状态等步骤。

代码

引入相关库文件

#include <WiFi.h>
#include <Preferences.h>
#include "BluetoothSerial.h"

定义变量

String ssids_array[50];
String network_string;
String connected_string;

const char* pref_ssid = "";
const char* pref_pass = "";
String client_wifi_ssid;
String client_wifi_password;

const char* bluetooth_name = "ESP32 BLE";

long start_wifi_millis;
long wifi_timeout = 10000;
bool bluetooth_disconnect = false;

enum wifi_setup_stages { NONE, SCAN_START, SCAN_COMPLETE, SSID_ENTERED, WAIT_PASS, PASS_ENTERED, WAIT_CONNECT, LOGIN_FAILED };
enum wifi_setup_stages wifi_stage = NONE;

BluetoothSerial SerialBT;
Preferences preferences;

WIFI联网函数

bool init_wifi()
{
  String temp_pref_ssid = preferences.getString("pref_ssid");
  String temp_pref_pass = preferences.getString("pref_pass");
  pref_ssid = temp_pref_ssid.c_str();
  pref_pass = temp_pref_pass.c_str();

  Serial.println(pref_ssid);
  Serial.println(pref_pass);

  WiFi.config(INADDR_NONE, INADDR_NONE, INADDR_NONE);

    WiFi.mode(WIFI_STA);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(pref_ssid);
  WiFi.begin(pref_ssid, pref_pass);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  
    if (millis() - start_wifi_millis > wifi_timeout) {
      WiFi.disconnect(true, true);
      return false;
    }
  }
      
       Serial.println();
  Serial.print("ESP32-CAM IP Address: ");
  Serial.println(WiFi.localIP());
  
  return true;
}

扫码周围已存在网络

void scan_wifi_networks()
{
  WiFi.mode(WIFI_STA);
  // WiFi.scanNetworks will return the number of networks found
  int n =  WiFi.scanNetworks();
  if (n == 0) {
    SerialBT.println("no networks found");
  } else {
    SerialBT.println();
    SerialBT.print(n);
    SerialBT.println(" networks found");
    delay(1000);
    for (int i = 0; i < n; ++i) {
      ssids_array[i + 1] = WiFi.SSID(i);
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.println(ssids_array[i + 1]);
      network_string = i + 1;
      network_string = network_string + ": " + WiFi.SSID(i) + " (Strength:" + WiFi.RSSI(i) + ")";
      SerialBT.println(network_string);
    }
    wifi_stage = SCAN_COMPLETE;
  }
}

回调函数，从蓝牙获取wifi登陆信息

void callback(esp_spp_cb_event_t event, esp_spp_cb_param_t *param)
{
  
  if (event == ESP_SPP_SRV_OPEN_EVT) {
    wifi_stage = SCAN_START;
  }

  if (event == ESP_SPP_DATA_IND_EVT && wifi_stage == SCAN_COMPLETE) { // data from phone is SSID
    int client_wifi_ssid_id = SerialBT.readString().toInt();
    client_wifi_ssid = ssids_array[client_wifi_ssid_id];
    wifi_stage = SSID_ENTERED;
  }

  if (event == ESP_SPP_DATA_IND_EVT && wifi_stage == WAIT_PASS) { // data from phone is password
    client_wifi_password = SerialBT.readString();
    client_wifi_password.trim();
    wifi_stage = PASS_ENTERED;
  }

}

回调显示已分配IP地址

void callback_show_ip(esp_spp_cb_event_t event, esp_spp_cb_param_t *param)
{
  if (event == ESP_SPP_SRV_OPEN_EVT) {
    SerialBT.print("ESP32 IP: ");
    SerialBT.println(WiFi.localIP());
    bluetooth_disconnect = true;
  }
}

联网完成，断开蓝牙

void disconnect_bluetooth()
{
  delay(1000);
  Serial.println("BT stopping");
  SerialBT.println("Bluetooth disconnecting...");
  delay(1000);
  SerialBT.flush();
  SerialBT.disconnect();
  SerialBT.end();
  Serial.println("BT stopped");
  delay(1000);
  bluetooth_disconnect = false;
}

启动程序

void setup()
{
/********************** BluetoothWifi ***************************/
  Serial.begin(115200);
  Serial.println("Booting...");

  preferences.begin("wifi_access", false);

  if (!init_wifi()) { // Connect to Wi-Fi fails
    SerialBT.register_callback(callback);
  } else {
    SerialBT.register_callback(callback_show_ip);
  }

  SerialBT.begin(bluetooth_name);
/********************** 放置你的setup代码，执行一次 ***************************/
 Serial.println("Test just once...");

}

循环检测是否需要配网

void loop()
{
/********************** BluetoothWifi ***************************/
  if (bluetooth_disconnect)
  {
    disconnect_bluetooth();
  }

  switch (wifi__stage)
  {
    case SCAN_START:
      SerialBT.println("Scanning Wi-Fi networks");
      Serial.println("Scanning Wi-Fi networks");
      scan_wifi_networks();
      SerialBT.println("Please enter the number for your Wi-Fi");
      wifi_stage = SCAN_COMPLETE;
      break;

    case SSID_ENTERED:
      SerialBT.println("Please enter your Wi-Fi password");
      Serial.println("Please enter your Wi-Fi password");
      wifi_stage = WAIT_PASS;
      break;

    case PASS_ENTERED:
      SerialBT.println("Please wait for Wi-Fi connection...");
      Serial.println("Please wait for Wi_Fi connection...");
      wifi_stage = WAIT_CONNECT;
      preferences.putString("pref_ssid", client_wifi_ssid);
      preferences.putString("pref_pass", client_wifi_password);
      if (init_wifi()) { // Connected to WiFi
        connected_string = "ESP32 IP: ";
        connected_string = connected_string + WiFi.localIP().toString();
        SerialBT.println(connected_string);
        Serial.println(connected_string);
        bluetooth_disconnect = true;
      } else { // try again
        wifi_stage = LOGIN_FAILED;
      }
      break;

    case LOGIN_FAILED:
      SerialBT.println("Wi-Fi connection failed");
      Serial.println("Wi-Fi connection failed");
      delay(2000);
      wifi_stage = SCAN_START;
      break;
  }
/********************** 放置你的loop代码，重复执行 ***************************/

 Serial.println("Test repeat...");
 delay(5000);

  
}

编译好的二进制文件，直接烧录，即可体验。https://download.csdn.net/download/u014331212/85019734

ESP32/8266 蓝牙配网 Blufi 开源

概览

BluFi 流程

代码

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