- Wed Jun 07, 2017 4:22 pm
#66878
I need to listen for udp.multicast messages. this works!
As long as the multicast messages ar comming in, I also need to listen to another udp port abd cinnybucate via this (simplified):
The last line in setup() (udp.begin(49000L);) will cause multicast to stop listening for multicast messages.
Otherwise the loop will run forewer!
What am I doing worng?
Is there a way to solve the problem?
Tnx in advance.
Erik
As long as the multicast messages ar comming in, I also need to listen to another udp port abd cinnybucate via this (simplified):
Code: Select all
#include <ESP8266WiFi.h>
#include <WiFiUDP.h>
const char* ssid = "...."; // your network SSID (name)
const char* pass = "......"; // your network password
byte packetBuffer[512]; //buffer to hold incoming and outgoing packets
WiFiUDP Udp;
WiFiUDP udp;
unsigned long timer;
bool status = true;
bool oldStatus = status;
void setup() {
Serial.begin(115200);
WiFi.begin(ssid, pass);
Serial.print("[Connecting]");
Serial.print(ssid);
int tries = 0;
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
tries++;
if (tries > 30) {
break;
}
}
Serial.println();
Serial.println("Connected to wifi");
Serial.println(WiFi.localIP());
Serial.println("Starting multicast");
Udp.beginMulticast(WiFi.localIP(), IPAddress(239, 255, 1, 1), 49707);
// Starting udp
//udp.begin(49000L); // introducing this, cause multicast to stop listening (sometime after while) - why?
}
void loop() {
if (millis() > timer) {
status = false;
}
int noBytes = Udp.parsePacket();
if ( noBytes ) {
Udp.read(packetBuffer, noBytes); // read the packet into the buffer
status = true;
timer = millis() + 4000L;
}
if (oldStatus == status) return;
// here when status change!
oldStatus = status;
Serial.printf("%6d Status: %s\n", round(millis()/1000), status ? "online" : "offline");
if (status) {
// now online - start using udp for communication on port 49000
} else {
// now offline - wait for online again.
}
}
The last line in setup() (udp.begin(49000L);) will cause multicast to stop listening for multicast messages.
Otherwise the loop will run forewer!
What am I doing worng?
Is there a way to solve the problem?
Tnx in advance.
Erik
