Wio-TerminalでWiFiで使う(その３: REST-API)

2020/7/11

PlatformIO cli Wio Terminal WiFi3

PlatformIO cli Wio Terminal WiFi3

概要

Wio-TerminalでWiFiで使う(その３: REST-API)
本記事は、[Wio-TerminalでWiFiで使う(その２: STARTWARS,WEB_ACCESS)]の続きになる。
(ホストPCとしてはubuntuを想定している)

wifi_rest_api

REST-APIのwebサーバーのスケッチ：

src/wifi_rest_api.ino

  /*
      Rest-API server

      Forked from arduino-esp32 on 04 July, 2018
      by Elochukwu Ifediora (fedy0)
  */

  #include <AtWiFi.h>
  #include <WiFiClient.h>
  #include <WiFiAP.h>

  #define LED 2   // Set the GPIO pin where you connected your test LED

  // Set these to your desired credentials.
  const char* ssid = "MyAP";
  const char* password = "mypasswd";

  WiFiServer server(80);

  void setup() {
      pinMode(LED, OUTPUT);

      Serial.begin(115200);
      while(!Serial); // Wait for Serial to be ready
      delay(1000);
      Serial.println();
      Serial.println("Configuring access point...");

      // You can remove the password parameter if you want the AP to be open.
      WiFi.softAP(ssid, password);
      IPAddress myIP = WiFi.softAPIP();
      /*
       * Note 1
       * Record this IP, will used by Client (such as Web Browser)
       */
      Serial.print("AP IP address: ");
      Serial.println(myIP);
      server.begin();

      Serial.println("Server started");
  }

  void loop() {
      WiFiClient client = server.available();   // listen for incoming clients

      if (client) {                             // if you get a client,
          Serial.println("New Client.");           // print a message out the serial port
          String currentLine = "";                // make a String to hold incoming data from the client
          while (client.connected()) {            // loop while the client's connected
              if (client.available()) {             // if there's bytes to read from the client,
                  char c = client.read();             // read a byte, then
                  /////Serial.write(c);                    // print it out the serial monitor
                  if (c == '\n') {                    // if the byte is a newline character

                      // if the current line is blank, you got two newline characters in a row.
                      // that's the end of the client HTTP request, so send a response:
                      if (currentLine.length() == 0) {
                          // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
                          // and a content-type so the client knows what's coming, then a blank line:
                          ////client.println("HTTP/1.1 200 OK");
                          ////client.println("Content-type:text/html");
                          ////client.println();

                          // the content of the HTTP response follows the header:
                          ////client.print("Click <a href=\"/H\">here</a> to turn ON the LED.<br>");
                          ////client.print("Click <a href=\"/L\">here</a> to turn OFF the LED.<br>");

                          // The HTTP response ends with another blank line:
                          client.println();
                          // break out of the while loop:
                          break;
                      } else {    // if you got a newline, then clear currentLine:
                          currentLine = "";
                      }
                  } else if (c != '\r') {  // if you got anything else but a carriage return character,
                      currentLine += c;      // add it to the end of the currentLine
                  }

                  // Check to see if the client request was "GET /H" or "GET /L":
                  //if (currentLine.endsWith("GET /H")) {
                  if (currentLine.endsWith("/H")) {
                      digitalWrite(LED, HIGH);               // GET /H turns the LED on
                      Serial.println("****ON****");
                      currentLine ="";
                      client.println("{ \"LED\" : \"on\"  }");
                  }
                  //if (currentLine.endsWith("GET /L")) {
                  if (currentLine.endsWith("/L")) {
                      digitalWrite(LED, LOW);                // GET /L turns the LED off
                      Serial.println("****OFF****");
                      currentLine ="";
                      client.println("{ \"LED\" : \"off\"  }");
                  }

                  if (currentLine.endsWith("/api/v1/led=1")) {
                      digitalWrite(LED, HIGH);
                      Serial.println("led: ON");
                      currentLine ="";
                      client.println("{ \"LED\" : \"on\"  }");
                  }

                  if (currentLine.endsWith("/api/v1/led=0")) {
                      digitalWrite(LED, LOW);
                      Serial.println("led: OFF");
                      currentLine ="";
                      client.println("{ \"LED\" : \"off\"  }");
                  }

              }
          }
          // close the connection:
          client.stop();
          Serial.println("Client Disconnected.");
      }
  }
  

スケッチ実行後、SSIDとして「MyAP」が見えるので パスワードとして"mypasswd"を入力してWiFi接続する。 その後、以下のようなコマンドでwio-terminalを制御できる： (curlによる)コマンド実行例：

  $ curl 'http://192.168.43.1:80/api/v1/led=0'
  { "LED" : "off"  }

  $ curl 'http://192.168.43.1:80/api/v1/led=1'
  { "LED" : "on"  }

  $ curl 'http://192.168.43.1:80/api/v1/led=0'
  { "LED" : "off"  }

  $ curl 'http://192.168.43.1:80/api/v1/led=1'
  { "LED" : "on"  }

  $ curl 'http://192.168.43.1:80/L'
  { "LED" : "off"  }

  $ curl 'http://192.168.43.1:80/H'
  { "LED" : "on"  }

  

出力例：

  picocom /dev/ttyACM0 -b115200

  Configuring access point...
  AP IP address: 192.168.43.1
  Server started
  New Client.
  led: OFF
  Client Disconnected.
  New Client.
  led: ON
  Client Disconnected.
  New Client.
  led: OFF
  Client Disconnected.
  New Client.
  led: ON
  Client Disconnected.
  

参考情報

Platform/Wio Terminal Network/Wi-Fi - example sketches

Wio Terminalをはじめよう(ピン配置、データシート、回路図など)

Platform/Wio Terminal/Network/Overview
download url:
https://files.seeedstudio.com/wiki/Wio-Terminal/res/ameba-image-Tool-v2.4.1.zip
https://files.seeedstudio.com/wiki/Wio-Terminal/res/20200601-rtl8720d-images-v2.2.0.0.zip

PlatformIO Core (CLI)

以上