void setup() {
  Serial.begin(9600);
  WiFi.mode(WIFI_AP);
  WiFi.softAP("myap", "mypass");
  WiFi.softAPConfig(IP, IP, mask);
  server.begin();
}
void loop() {
  WiFiClient client = server.available();
  if (!client) {
    return;
  }
  String request = client.readStringUntil('r');
  Serial.println("From STA: " + request);
  client.println("DATA 1r");   // data 1
  client.println("DATA 2r"); // data 2


  client.flush();
  client.stop();
}

void setup() {
  Serial.begin(9600);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(300);
  }
}
void loop() {
  client.connect(server, 80);
  client.print("DATA 3 r");
  String answer = client.readStringUntil('r');
  Serial.println("From AP: " + answer);
  client.flush();
  client.stop();
}

From STA: DATA 3
From STA: DATA 3
From STA: DATA 3
.
.
.

From AP:  DATA 1
From AP:  DATA 1
From AP:  DATA 1
.
.
.

0-> loop start
1-> Client Connect
2-> Get Request Client   -> (async (not waiting request))
3-> send client "data 1" -> Send OKAY (async)
4-> send client "data 2" -> Send Okay (async)
5-> client disconnect    -> (because need new clients connect (1) ) ->  max 8 client.
6-> loop again.

0-> loop start
1-> server connect (async)
2-> send server "data 3" -> (async)
3-> get "data" from server -> only works first data.!! (async)
  (This problem.) im need get all data.
4-> show data in Serial -> (async)
5-> disconnect from server (because) server-> allows 1 connection at the same time
6-> loop again