ESP8266 Community Forum

- Sat Nov 08, 2014 5:35 pm #2354 I seem to be having difficulties sending UDP packets. Here's a slightly simplified view of what I'm doing:

Code: Select allvoid setup() {
  // reset WiFi module
  wifi.println("AT+RST");
  // 500ms delay followed by reading the result
  wifi.println("AT+CWMODE=1");
  // 500ms delay followed by reading the result
  wifi.println("AT+CWJAP=\"accesspoint\",\"password\"");
  // 500ms delay followed by reading the result
  wifi.println("AT+CIPSTART=\"UDP\",\"10.0.1.100\",\"34807\"");
  // 500ms delay followed by reading the result
}

void loop() {
  int v;
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
   
    rs232.print("Sending beacon: ");
    char *data = "Beacon,10.0.1.57,8080";
   
    int bytes = strlen(data);
    wifi.print("AT+CIPSEND=");
    wifi.println(bytes);
    wifi.println(data);
    wifi.println("AT+CIPCLOSE");
  }
 
  while(wifi.available() > 0) {
    v = Serial.read();
    if (v == 10) {
      wb[wctr] = 0;
      wctr = 0;
      rs232.println(wb);
    } else if (v == 13) {
      // gndn
    } else {
      wb[wctr] = v;
      wctr++;
    }
  }
}

And here's what I get back:

Code: Select allAT+CIPSEND=23
> MyBeacon,10.0.1.57,8080AT+CIPCLOSE
busy s...

busy s...

SEND OK

Nothing ever arrives at the destination. I've tested the server with code running on other systems and it works fine, so I'm guessing something is going wrong with my ESP-8266. Any suggestions or clues?

Thanks!