For my project, I am using the UDP library to communicate with 3 Arduinos via Wifly modules. Everything is working fine, except receive listener seems to be blocked after a couple of minutes. If a udp message is not sent to an arduino after a while, processing will stop receiving messages from the address. I've been using Wireshark to view the network activity and there haven't been any dropped packets.
Anyone else have the same issue? Below is how I have setup the udp communication. I could just send a random message if nothing has been sent for a certain amount of time, but I was wondering if there was an easy way to turn off the blocking.
//works with udp test for send/receive, 2 way comm.
// import UDP library
import hypermedia.net.*;
UDP udp; // define the UDP object
boolean sendMsg = false;
boolean send = false;
int currentTime = 0;
int prevTime = 0;
int interval = 2000; //no buffer overrun on arduino
/**
* init
*/
void setup() {
// create a new datagram connection on port 4001
// and wait for incoming message
udp = new UDP( this, 4001 );
//udp.log( true ); // <-- printout the connection activity
udp.listen( true );
}
//process events
void draw() {
currentTime = millis();
if((currentTime - prevTime) > interval)
{
prevTime = currentTime;
if(sendMsg == true)
{
if(send == true)
{
String ip = "172.16.2.4"; // the remote IP address
int port = 4000; // the destination port
String message = "225;255;255;h;@";
udp.send( message, ip, port );
println( "send: \""+message+"\" to "+ip+" on port "+port );
String ip2 = "172.16.2.3"; // the remote IP address
udp.send( message, ip2, port );
println( "send: \""+message+"\" to "+ip2+" on port "+port );
send = false;
}
else
{
String ip = "172.16.2.4"; // the remote IP address
int port = 4000; // the destination port
String message = "0;0;0;l;@";
udp.send( message, ip, port );
println( "send: \""+message+"\" to "+ip+" on port "+port );
String ip2 = "172.16.2.3"; // the remote IP address
udp.send( message, ip2, port );
println( "send: \""+message+"\" to "+ip2+" on port "+port );
send = true;
}
}
}
}
/**
* on key pressed event:
* send the current key value over the network
*/
void keyPressed() {
String message = str( key );// the message to send
String ip = "172.16.2.4";// the remote IP address
int port = 4000;// the destination port
println( "send: \""+message+"\" to "+ip+" on port "+port );
// formats the message for Pd
message = "225;255;255;" + message + ";@";
//message = "hello";
// send the message
udp.send( message, ip, port );
}
/**
* To perform any action on datagram reception, you need to implement this
* handler in your code. This method will be automatically called by the UDP
* object each time he receive a nonnull message.
* By default, this method have just one argument (the received message as
* byte[] array), but in addition, two arguments (representing in order the
* sender IP address and his port) can be set like below.
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