Wi-Fi

デジタルIO
アナログIO
拡張IO
時間
数学
三角関数
乱数
ビットバイト操作
割り込み
シリアル通信

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カメラ
サーボモーター
ステッピングモーター
キャラクタ液晶表示
SPI通信
I²C通信(Wire)
SD
SD(File操作)
周期処理(MsTimer2)
時計(RTC)

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概要
Storage
Wi-Fi
TLS (HTTPS)
AUDIO
マイク
BLE

ESP32のWi-Fiと、Mbed OSのTCP Socketを使ったサンプルです。

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アクセスポイントのスキャンと、HTTP GETを行うサンプルです。SSIDとパスワードを変更してください。

#include <Arduino.h>
#include "TCPSocket.h"
#include "ESP32Interface.h"
    
#define MBED_CONF_APP_WIFI_SSID "Okamylab7"
#define MBED_CONF_APP_WIFI_PASSWORD "oooooooo"
ESP32Interface wifi;
    
const char *sec2str(nsapi_security_t sec)
{
    switch (sec) {
        case NSAPI_SECURITY_NONE:
            return "None";
        case NSAPI_SECURITY_WEP:
            return "WEP";
        case NSAPI_SECURITY_WPA:
            return "WPA";
        case NSAPI_SECURITY_WPA2:
            return "WPA2";
        case NSAPI_SECURITY_WPA_WPA2:
            return "WPA/WPA2";
        case NSAPI_SECURITY_UNKNOWN:
        default:
            return "Unknown";
    }
}
    
int scan_demo(WiFiInterface *wifi)
{
    WiFiAccessPoint *ap;
    int count = 15;    /* Limit number of network arbitrary to 15 */
    
    printf("Scan:\r\n");
    
    ap = new WiFiAccessPoint[count];
    count = wifi->scan(ap, count);
    for (int i = 0; i < count; i++)
    {
        printf("Network: %s secured: %s BSSID: %hhX:%hhX:%hhX:%hhx:%hhx:%hhx RSSI: %hhd Ch: %hhd\r\n", ap[i].get_ssid(),
                sec2str(ap[i].get_security()), ap[i].get_bssid()[0], ap[i].get_bssid()[1], ap[i].get_bssid()[2],
                ap[i].get_bssid()[3], ap[i].get_bssid()[4], ap[i].get_bssid()[5], ap[i].get_rssi(), ap[i].get_channel());
    }
    printf("%d networks available.\r\n", count);
    
    delete[] ap;
    
    return count;
}
    
void http_demo(NetworkInterface *net)
{
    TCPSocket socket;
    
    printf("Sending HTTP request to www.arm.com...\r\n");
    
    // Open a socket on the network interface, and create a TCP connection to www.arm.com
    socket.open(net);
    socket.connect("www.arm.com", 80);
    
    // Send a simple http request
    char sbuffer[] = "GET / HTTP/1.1\r\nHost: www.arm.com\r\n\r\n";
    int scount = socket.send(sbuffer, sizeof sbuffer);
    printf("sent %d [%.*s]\r\n", scount, strstr(sbuffer, "\r\n")-sbuffer, sbuffer);
    
    // Recieve a simple http response and print out the response line
    char rbuffer[64];
    int rcount = socket.recv(rbuffer, sizeof rbuffer);
    printf("recv %d [%.*s]\r\n", rcount, strstr(rbuffer, "\r\n")-rbuffer, rbuffer);
    
    // Close the socket to return its memory and bring down the network interface
    socket.close();
}
    
void setup() {
    printf("WiFi example\r\n\r\n");
    
    while (scan_demo(&wifi) == 0);
    
    printf("\r\nConnecting...\r\n");
    int ret = wifi.connect(MBED_CONF_APP_WIFI_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA_WPA2);
    if (ret != 0) {
        printf("\r\nConnection error\r\n");
        while(1);
    }
    
    printf("Success\r\n\r\n");
    printf("MAC: %s\r\n", wifi.get_mac_address());
    printf("IP: %s\r\n", wifi.get_ip_address());
    printf("Netmask: %s\r\n", wifi.get_netmask());
    printf("Gateway: %s\r\n", wifi.get_gateway());
    printf("RSSI: %d\r\n\r\n", wifi.get_rssi());
    
    http_demo(&wifi);
    
    wifi.disconnect();
    
    printf("\r\nDone\r\n");
}
    
void loop() {
    
}