[zeromq-dev] No UDP broadcast message received using CZMQ zbeacon on RaspberryPi3

[Kevin Sapper]

I successfully used it through zyre on 20 raspberry pi1.

Am 28.11.2016 3:50 nachm. schrieb "Luca Boccassi" <luca.boccassi at gmail.com>:

> Hi,
>
> There is a CZMQ 4.0.x series now, loads of changes have gone in since
> 3.0.2. I would recommend trying it as the first thing.
>
> https://github.com/zeromq/czmq/releases
>
> On Mon, 2016-11-28 at 12:42 -0200, Rodrigo Madruga wrote:
> > Hello all,
> >
> > I am developing a system that uses CZMQ's zbeacon (broadcast on UDP) for
> > app discovery. Beacon sender is Windows box and receiver is RaspberryPi3.
> >
> > As the subject says, no message is reaching the zbeacon actor.
> >
> > Using czmq3.0.2 and zmq4.1.6 built directly on pi to rule out
> > cross-compiling issues.
> >
> > Calling just zbeacon_test() returns "OK" without assertions errors.
> >
> > Broadcast messages are indeed reaching the pi, as shown by tcpdump:
> >
> >     pi at raspberrypi:~ $ sudo tcpdump udp port 5670
> >     tcpdump: verbose output suppressed, use -v or -vv for full protocol
> > decode
> >     listening on wlan0, link-type EN10MB (Ethernet), capture size 262144
> > bytes
> >     13:33:56.203230 IP [REDACTED].5670 > 192.168.1.255.5670: UDP, length
> 22
> >     13:34:01.072476 IP [REDACTED].5670 > 192.168.1.255.5670: UDP, length
> 22
> >
> > The code used to test is based on zbeacon_test function:
> >
> >     zactor_t *listener = zactor_new (zbeacon, NULL);
> >     assert (listener);
> >     zsock_send (listener, "si", "CONFIGURE", 5670);
> >     hostname = zstr_recv (listener);
> >     assert (*hostname);
> >     free (hostname);
> >
> >     zsock_send (listener, "sb", "SUBSCRIBE", "", 0);
> >
> >     zpoller_t *poller = zpoller_new (listener, NULL);
> >     assert (poller);
> >     int64_t stop_at = zclock_mono () + 10000; // wait 10 seconds
> >     while (zclock_mono () < stop_at) {
> >         long timeout = (long) (stop_at - zclock_mono ());
> >         if (timeout < 0)
> >             timeout = 0;
> >         void *which = zpoller_wait (poller, timeout * ZMQ_POLL_MSEC);
> >         if (which) {
> >             char *ipaddress, *received;
> >             zstr_recvx (which, &ipaddress, &received, NULL);
> >             printf("From address %s:%s\n", ipaddress, received);
> >             zstr_free (&ipaddress);
> >             zstr_free (&received);
> >         }
> >     }
> >     zpoller_destroy (&poller);
> >
> >     //  Stop listening
> >     zstr_sendx (listener, "UNSUBSCRIBE", NULL);
> >
> >     //  Destroy the test nodes
> >     zactor_destroy (&listener);
> >
> > I cross-compiled a simple Qt app with a QUdpSocket (below) and the
> messages
> > were received without issues:
> >
> >     #include <QtNetwork/QUdpSocket>
> >
> >     TestUDP::TestUDP(QObject *parent) :
> >         QObject(parent)
> >     {
> >         qDebug() << "Binding UDP Socket";
> >         socket = new QUdpSocket(this);
> >         socket->bind(QHostAddress::Any, 5670);
> >         connect(socket, &QUdpSocket::readyRead,this,
> &TestUDP::readyRead);
> >         qDebug() << "Ready Read signal connected0, waiting for
> broadcasts";
> >     }
> >
> >     void TestUDP::readyRead(){
> >         QByteArray buffer;
> >         buffer.resize(socket->pendingDatagramSize());
> >         //var to store headers from udp
> >         QHostAddress sender;
> >         quint16 sender_port;
> >         socket->readDatagram(buffer.data(),buffer.size(), &sender,
> > &sender_port);
> >         qDebug() << "Message from " << sender << " port " << sender_port;
> >         qDebug() << "Msg: " << buffer;
> >     }
> >
> > Maybe the problem is at the way zbeacon is dealing with the UDP socket...
> >
> > Has anyone successfully used a zbeacon on RPI3?
> >
> > Thanks in advance!
> >
> > Rodrigo Madruga.
> > _______________________________________________
> > zeromq-dev mailing list
> > zeromq-dev at lists.zeromq.org
> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>
>
>
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