回答編集履歴
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別解掲載
test
CHANGED
@@ -1,229 +1,170 @@
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2022年4月現在で'ESP32 複数 クライアント'でググったらこれがトップでヒットしちゃって...ちょっと恥ずかしいかな。
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2
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普通にArduinoライブラリでもできちゃったので、一応そちらも載せておきます。二口分の受け方は「ベタ」に書いているので、実際になにかするなら美しくまとめてください。もちろん、動作中にreadStringUntil()とかでブロックしたりしちゃいけませんよ。
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```Arduino
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4
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#include <WiFi.h>
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5
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WiFiServer server(54321);
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7
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void setup() {
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Serial.begin(115200);
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9
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WiFi.begin(); //引数省略で最後に接続したAPにつなぎに行く。WiFiの接続とソケットの接続を混同しないようにしましょう。
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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}
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Serial.println(WiFi.localIP());
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server.begin();
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}
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WiFiClient client[2];
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String s[2];
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void loop() {
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if( !client[0].connected()){
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client[0]= server.available();
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if(client[0].connected()){
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Serial.println("Connected to 0");
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client[0].println("Connected to 0");
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}
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}else{
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while(client[0].available()){
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char c=client[0].read();
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s[0]+=c;
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if(c=='\n'){
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Serial.println(s[0]);
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client[0].print(s[0]);
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}
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}
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}
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if( !client[1].connected()){
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client[1]= server.available();
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if(client[1].connected()){
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Serial.println("Connected to 1");
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client[1].println("Connected to 1");
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}
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}else{
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while(client[1].available()){
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char c=client[1].read();
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s[1]+=c;
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if(c=='\n'){
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Serial.println(s[1]);
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client[1].print(s[1]);
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}
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}
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}
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}
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```
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以下原文
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---
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1
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既存のライブラリを真面目に探せばもっといい処理もできそうな気がしますが、見つからなかったので原始的にやってみました。WiFiを繋いだあとはCでソケットを扱う場合の定番にほぼ沿ったものです。
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```Arduino
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <WiFi.h>
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static const char *WIFI_SSID = "WROOM32";
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-
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static const char *WIFI_PASS = "password";
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-
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const int port = 1337;
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int fd, maxfd;
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-
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int fd2[2] = { -1, -1}; //二口だけ接続をうけつける
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struct sockaddr_in addr;
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struct sockaddr_in from_addr;
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-
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struct timeval tv;
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-
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72
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//サーバー設定-------------------------------------------------
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IPAddress ip(192, 168, 1, 10);
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//-------------------------------------------------------------
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void setup() {
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Serial.begin(115200);
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-
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//Wi-Fiアクセスポイント開始--------------------------------------------------------
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WiFi.mode(WIFI_AP);
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80
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WiFi.softAP(WIFI_SSID, WIFI_PASS);
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WiFi.softAPConfig(ip, WiFi.gatewayIP(), WiFi.subnetMask());
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//WiFi.softAPConfig(ip, gateway, netmask);
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84
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IPAddress myIP = WiFi.softAPIP();
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Serial.println("APStarted. myIP Address:");
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Serial.println(myIP);
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Serial.print("server Mac Address: ");
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Serial.println(WiFi.macAddress());
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Serial.print("Subnet Mask: ");
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Serial.println(WiFi.subnetMask());
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Serial.print("Gateway IP: ");
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Serial.println(WiFi.gatewayIP());
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//------------------------------------------------------------------------------
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if ( (fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
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Serial.println("socket error.");
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while (1);
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}
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addr.sin_family = AF_INET;
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addr.sin_port = ntohs(port);
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addr.sin_addr.s_addr = INADDR_ANY;
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if ( bind( fd, (struct sockaddr *)&addr, sizeof(addr)) < 0 ) {
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Serial.println( "bind error" );
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while (1);
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}
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-
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106
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}
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void loop() {
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if ( listen(fd, 1) < 0) {
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Serial.println("listen error.");
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}
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114
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115
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET( fd, &fds);
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maxfd = fd;
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for (int i = 0; i < 2; i++) {
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if (fd2[i] != -1) {
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FD_SET(fd2[i], &fds);
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if (fd2[i] > fd) {
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maxfd = fd2[i];
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}
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}
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}
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tv.tv_sec = 0;
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tv.tv_usec = 10000;
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int cnt = select(maxfd + 1, &fds, NULL, NULL, &tv);
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if (cnt <= 0) {
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//error or timeout
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for (int i = 0; i < 2; i++) {
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133
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if (fd2[i] >= 0) {
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//既接続のソケットに対して送信
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char buf[32];
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cnt = sprintf(buf, "To %d %ld\n", fd2[i], millis());
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write(fd2[i], buf, cnt);
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}
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}
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}
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if (FD_ISSET( fd, &fds)) {
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for (int i = 0; i < 2; i++) {
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//接続受付
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if (fd2[i] == -1) {
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socklen_t len = sizeof(struct sockaddr_in);
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if ((fd2[i] = accept(fd, (struct sockaddr *)&from_addr, &len)) < 0) {
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Serial.println("accept error.");
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while (1);
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}
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Serial.println("connect " + String( fd2[i]));
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break;
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}
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}
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}
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for (int i = 0; i < 2; i++) {
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if (fd2[i] != -1 && FD_ISSET(fd2[i], &fds) ) {
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//受信&接続断検出
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char buf[256];
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int rcvCnt = recv(fd2[i], buf, sizeof(buf), 0);
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Serial.println("rcvd:" + String(buf));
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if (rcvCnt < 0) {
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Serial.println("disconnect " + String(fd2[i]));
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close(fd2[i]);
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fd2[i] = -1;
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165
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}
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166
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}
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}
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168
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}
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```
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170
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120
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-
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121
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fd_set fds;
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-
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123
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FD_ZERO(&fds);
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125
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FD_SET( fd, &fds);
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127
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maxfd = fd;
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128
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-
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129
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for (int i = 0; i < 2; i++) {
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130
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-
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131
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if (fd2[i] != -1) {
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132
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-
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133
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FD_SET(fd2[i], &fds);
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134
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-
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135
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if (fd2[i] > fd) {
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136
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-
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137
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maxfd = fd2[i];
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138
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-
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139
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}
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140
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-
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141
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}
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142
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-
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143
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}
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144
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-
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145
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tv.tv_sec = 0;
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146
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-
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147
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tv.tv_usec = 10000;
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148
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149
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int cnt = select(maxfd + 1, &fds, NULL, NULL, &tv);
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150
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151
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if (cnt <= 0) {
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152
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153
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//error or timeout
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154
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155
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for (int i = 0; i < 2; i++) {
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156
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-
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157
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if (fd2[i] >= 0) {
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158
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-
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159
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//既接続のソケットに対して送信
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160
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-
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161
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char buf[32];
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162
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163
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cnt = sprintf(buf, "To %d %ld\n", fd2[i], millis());
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164
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165
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write(fd2[i], buf, cnt);
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166
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-
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167
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}
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168
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-
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169
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}
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170
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-
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171
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}
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172
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-
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173
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if (FD_ISSET( fd, &fds)) {
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174
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-
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175
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for (int i = 0; i < 2; i++) {
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176
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-
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177
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//接続受付
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178
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-
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179
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if (fd2[i] == -1) {
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180
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-
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181
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socklen_t len = sizeof(struct sockaddr_in);
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182
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-
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183
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if ((fd2[i] = accept(fd, (struct sockaddr *)&from_addr, &len)) < 0) {
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184
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-
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185
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Serial.println("accept error.");
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186
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-
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187
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while (1);
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188
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-
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189
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}
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190
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-
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191
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Serial.println("connect " + String( fd2[i]));
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192
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-
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193
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break;
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194
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-
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195
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}
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196
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-
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197
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-
}
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198
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-
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199
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-
}
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200
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-
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201
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-
for (int i = 0; i < 2; i++) {
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202
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-
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203
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if (fd2[i] != -1 && FD_ISSET(fd2[i], &fds) ) {
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204
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-
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205
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//受信&接続断検出
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206
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-
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207
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char buf[256];
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208
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-
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209
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int rcvCnt = recv(fd2[i], buf, sizeof(buf), 0);
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210
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-
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211
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Serial.println("rcvd:" + String(buf));
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212
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-
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213
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if (rcvCnt < 0) {
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214
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215
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Serial.println("disconnect " + String(fd2[i]));
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216
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-
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217
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close(fd2[i]);
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218
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-
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219
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fd2[i] = -1;
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220
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-
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221
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-
}
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222
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-
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223
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-
}
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224
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-
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225
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-
}
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226
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-
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227
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-
}
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228
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-
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229
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-
```
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