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@Tama79

安いWi-Fi機能付きのESP8266マイコンを試す（DHCP払出し待ち編）

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前の記事

準備編

WiFiクラサバ編

Arudiono IDEで使う

作りたかった機能

ルーター接続後、DHCPからのIP払い出し待ちでNGにならないように、接続後、DHCP払い出し待ちをする

Wi-Fiクライアント全体コード
スケッチ 
#include <ESP8266WiFi.h>

const uint8_t TARGET_LED_PIN  = LED_BUILTIN;
const uint8_t LED_ON          = LOW;
const uint8_t LED_OFF         = HIGH;

const unsigned long DELAY_TERM = 5000;
const unsigned long SERIAL_SPEED = 115200;

const char* WIFI_SSID       = "ｘｘｘｘｘｘｘｘｘｘ";
const char* WIFI_PASSWORD   = "ｘｘｘｘｘｘｘｘｘｘ";

const WiFiMode_t WIFI_MODE  = WIFI_STA;

const unsigned long WIFI_CONNECTED_CHECK_MS = 500;
const unsigned long WIFI_CONNECTED_TIMEOUT  = 10000;

const unsigned long WIFI_GET_DATA_TERM  = 1000;
const unsigned long WIFI_GET_DATA_WAIT  = 100;
const char* CONNECT_HOST = "192.168.0.5";
const char* CONNECT_HOST_CONTENTS[] = {"/404.non.html", "/", "/led/on", "/led/off", "/ad/"};
const int CONNECT_PORT = 80;
const int URL_INDEX_MIN = 0;
const int URL_INDEX_MAX = 4;

bool ConnectedStatus;

void setup() {
  Serial.begin(SERIAL_SPEED);
  Serial.println("");

  // ボード上のLEDを指定
  pinMode(TARGET_LED_PIN, OUTPUT);
  digitalWrite(TARGET_LED_PIN, LED_OFF);  // 消灯

  //  WiFi接続
  ConnectedStatus = false;
  ConnectedStatus = connect_WiFi(WIFI_SSID, WIFI_PASSWORD, WIFI_CONNECTED_TIMEOUT);
  if (ConnectedStatus)
  {
    Serial.print("Connected. local IP address: ");
    Serial.println(WiFi.localIP());
  }
  
  int urlindex = 0;
}

//  WiFi(Connect)
bool connect_WiFi(const char* ssid, const char* password, long connectTimeoutMS) {
  bool  connected = false;
  long  connectCheckTime = 0;

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  Serial.println("");
  Serial.println("Try to Connect To Router.");
  while (WiFi.status() != WL_CONNECTED)
  {
    connectCheckTime = connectCheckTime + WIFI_CONNECTED_CHECK_MS;
    delay(WIFI_CONNECTED_CHECK_MS);

    if (connectCheckTime > connectTimeoutMS)
    {
      Serial.println("Connected time out.");
      connected = false;
      break;
    }
    connected = true;
  }

  //  DHCP Trans
  if (WiFi.status() == WL_CONNECTED)
  {
    connectCheckTime = 0;
    Serial.println("Try to DHCP.");

    //  Wait from DHCP trans.
    while (connectCheckTime <= connectTimeoutMS)
    {
      //  Wait.
      delay(WIFI_CONNECTED_CHECK_MS);
      connectCheckTime = connectCheckTime + WIFI_CONNECTED_CHECK_MS;
      Serial.print(".");

      if (WiFi.localIP() != INADDR_NONE)
      {
        connected = true;
        break;
      }

      if (connectCheckTime > connectTimeoutMS)
      {
        connected = false;
        break;
      }
    }
    if (connected)
    {
      Serial.println("Connected, DHCP Ok.");
    }
    else
    {
      Serial.println("Connected, but DHCP time out.");
      connected = false;
    }
  }

  return connected;
}

void loop() {
  WiFiClient client;

  delay(WIFI_GET_DATA_TERM);

  if (ConnectedStatus)
  {
    digitalWrite(TARGET_LED_PIN, LED_ON);  // 点灯

    Serial.print("Local IP address: ");
    Serial.println(WiFi.localIP());
 
    Serial.print("connecting to ");
    Serial.println(CONNECT_HOST);
 
    // Use WiFiClient class to create TCP connections
    if (!client.connect(CONNECT_HOST, CONNECT_PORT)) {
      Serial.println("connection failed");
      return;
    }
  
    String url;
    if ((urlindex >= URL_INDEX_MIN) && (urlindex <= URL_INDEX_MAX)) {
      url = CONNECT_HOST_CONTENTS[urlindex];
      urlindex = urlindex + 1;
    }
    if (urlindex > URL_INDEX_MAX) {
      urlindex = 0;
    }

    Serial.print("Requesting URL: ");
    Serial.print(urlindex);
    Serial.print(" - ");
    Serial.println(url);
 
    // This will send the request to the server
    client.print(String("GET ") + url + " HTTP/1.1\r\n" +
                "Host: " + CONNECT_HOST + "\r\n" +
                "Connection: close\r\n\r\n");
    delay(WIFI_GET_DATA_WAIT);
  
    // Read all the lines of the reply from server and print them to Serial
    while(client.available()){
      String line = client.readStringUntil('\r');
      Serial.print(line);
    }
 
    Serial.println();
    Serial.println("closing connection");
  } else {
    //  接続無し
    Serial.println();
    Serial.println("nothing");
  }

  digitalWrite(TARGET_LED_PIN, LED_OFF);  // 消灯
}

下の3つは、自分の環境に合わせて変更してください。
const char* WIFI_SSID = "ｘｘｘｘｘｘｘｘｘｘ";
const char* WIFI_PASSWORD = "ｘｘｘｘｘｘｘｘｘｘ";
const char* CONNECT_HOST = "192.168.0.5";

Wi-Fiルータ接続待ち関数部分コードの説明
スケッチ 
//  WiFi(Connect)
bool connect_WiFi(const char* ssid, const char* password, long connectTimeoutMS) {
  bool  connected = false;
  long  connectCheckTime = 0;

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  Serial.println("");
  Serial.println("Try to Connect To Router.");
  while (WiFi.status() != WL_CONNECTED)
  {
    connectCheckTime = connectCheckTime + WIFI_CONNECTED_CHECK_MS;
    delay(WIFI_CONNECTED_CHECK_MS);

    if (connectCheckTime > connectTimeoutMS)
    {
      Serial.println("Connected time out.");
      connected = false;
      break;
    }
    connected = true;
  }

  //  DHCP Trans
  if (WiFi.status() == WL_CONNECTED)
  {
    connectCheckTime = 0;
    Serial.println("Try to DHCP.");

    //  Wait from DHCP trans.
    while (connectCheckTime <= connectTimeoutMS)
    {
      //  Wait.
      delay(WIFI_CONNECTED_CHECK_MS);
      connectCheckTime = connectCheckTime + WIFI_CONNECTED_CHECK_MS;
      Serial.print(".");

      if (WiFi.localIP() != INADDR_NONE)
      {
        connected = true;
        break;
      }

      if (connectCheckTime > connectTimeoutMS)
      {
        connected = false;
        break;
      }
    }
    if (connected)
    {
      Serial.println("Connected, DHCP Ok.");
    }
    else
    {
      Serial.println("Connected, but DHCP time out.");
      connected = false;
    }
  }

  return connected;
}

ステップ1.ルータ接続までのループ

while (WiFi.status() != WL_CONNECTED) {
    (省略)
}

でルータ接続を確認

ステップ2.ルータ接続を確認し、DHCP払い出し待ちループへ

//  DHCP Trans
if (WiFi.status() == WL_CONNECTED)
{
    (省略)
}

でルータ接続状態を確認

DHCP接続を WiFi.localIP()で実施。

    //  Wait from DHCP trans.
    while (connectCheckTime <= connectTimeoutMS)
    {
      (省略)
      if (WiFi.localIP() != INADDR_NONE)
      {
        connected = true;
        break;
      }
      (省略)
    }

INADDR_NONEだと、IPアドレス無効。
有効になるまでループする。

謝辞

以下の記事を参考に作りました。

最後に

スケッチコードはCC BY-SA 4.0（著作者の情報とCCライセンス継承はお願いします。商用利用・改変・再配布は問題なし）です。

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