wemosでalexaデバイス その5

概要

wemos d1で、alexaデバイスを作ってみる。
練習問題、やってみた。

練習問題

upnpのm-searchを実装せよ。

サンプルコード

#include <ESP8266WiFi.h>
#include <WiFiUDP.h>

const char * ssid = "****";
const char * password = "****";
static WiFiUDP udp;

void setup() {
	Serial.begin(115200);
	delay(100);
	boolean state = true;
	int i = 0;
	WiFi.mode(WIFI_STA);
	WiFi.begin(ssid, password);
	Serial.println("");
	Serial.println("Connecting to WiFi");
	Serial.print("Connecting ...");
	while (WiFi.status() != WL_CONNECTED)
	{
		delay(500);
		Serial.print(".");
		if (i > 10)
		{
			state = false;
			break;
		}
		i++;
	}
	if (state)
	{
		Serial.println("");
		Serial.print("Connected to ");
		Serial.println(ssid);
		Serial.print("IP address: ");
		Serial.println(WiFi.localIP());
	}
	else
	{
		Serial.println("");
		Serial.println("Connection failed.");
	}
	udp.begin(1900);
	Serial.println("Sending M-SEARCH multicast");
	udp.beginPacketMulticast(IPAddress(239, 255, 255, 250), 1900, WiFi.localIP());
	udp.write("M-SEARCH * HTTP/1.1\r\n"
		"HOST: 239.255.255.250:1900\r\n"
		"MX: 5\r\n"
		"MAN: \"ssdp:discover\"\r\n"
		"ST: upnp:rootdevice\r\n\r\n\r\n");
	udp.endPacket();
}
void loop() {
	IPAddress sonosIP;
	unsigned long lastSearch = millis();
	while ((millis() - lastSearch) < 5000)
	{
		int packetSize = udp.parsePacket();
		if (packetSize)
		{
			char packetBuffer[255];
			Serial.print("Received packet of size ");
			Serial.println(packetSize);
			Serial.print("From ");
			sonosIP = udp.remoteIP();
			Serial.print(sonosIP);
			Serial.print(", port ");
			Serial.println(udp.remotePort());
			int len = udp.read(packetBuffer, 255);
			if (len > 0)
			{
				packetBuffer[len] = 0;
			}
			Serial.println("Contents:");
			Serial.println(packetBuffer);
		}
		delay(50);
		Serial.print(".");
	}
	Serial.println("ok");
}

以上。