ESP8266 WIFIUDP Broadcast and Listen
Posted: Sat Dec 28, 2019 3:19 pmHi all
Maybe someone have a similary Problem and can help me.
I listen on a UPD port and periodically send a broadcast. I tested it with PacketSender.
- In the PacketSender I received all Broadcast Messages from all esp8266s's
- if I sende a braodcast message to the ESPs all received the Messages.
But the not the ESPs. What is wrong? the same with on or two UDPs
thanks for any tip.
Maybe someone have a similary Problem and can help me.
I listen on a UPD port and periodically send a broadcast. I tested it with PacketSender.
- In the PacketSender I received all Broadcast Messages from all esp8266s's
- if I sende a braodcast message to the ESPs all received the Messages.
But the not the ESPs. What is wrong? the same with on or two UDPs
thanks for any tip.
Code: Select all
WiFiUDP Udp;
WiFiUDP Udp1;
unsigned int localUdpPort = 1234; // local port to listen on
char incomingPacket[255]; // buffer for incoming packets
char replyPacket[] = "Hi there! Got the message :-)"; // a reply string to send back
int loop_counter = 0;
char _buffer[255] = "";
unsigned long mc_millis = 0;
int len;
IPAddress mc_ip;
void setup() {
Serial.begin(115200);
Serial.println();
Serial.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println(" connected");
mc_ip = WiFi.localIP();
mc_ip[3] = 255;
Udp.begin(localUdpPort);
Serial.printf("Now listening at IP %s, UDP port %d\n", WiFi.localIP().toString().c_str(), localUdpPort);
}
void loop() {
int packetSize = Udp.parsePacket();
if (packetSize) {
// receive incoming UDP packets
Serial.printf("Received %d bytes from %s, port %d\n", packetSize, Udp.remoteIP().toString().c_str(), Udp.remotePort());
int len = Udp.read(incomingPacket, 255);
if (len > 0) incomingPacket[len] = 0;
Serial.printf("UDP packet contents: %s\n", incomingPacket);
// send back a reply, to the IP address and port we got the packet from
Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
Udp.write(replyPacket);
Udp.endPacket();
}
yield();
if (millis()>mc_millis) {
mc_millis = millis() + 2000;
Serial.print(".");
//len = sprintf(_buffer,"Node:%08X/%d", ESP.getChipId(),loop_counter);
len = sprintf(_buffer,"Hallo");
Udp1.beginPacket(mc_ip,localUdpPort); // mc_ip, localUdpPort);
Udp1.write((uint8_t *)_buffer, len);
Udp1.endPacket();
++loop_counter;
}
}