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

[Rodrigo Madruga]

A few more tests and information about the issue:

pi at raspberrypi:~ $ uname -a
Linux raspberrypi 4.4.26-v7+ #915 SMP Thu Oct 20 17:08:44 BST 2016 armv7l
GNU/Linux

Now testing with zmq and czmq from master compiled on RPI with default
options:

*CZMQ version: 40002*
*ZMQ version: 40201*

Tried setting ZSYS_INTERFACE with "*", "wlan0", "eth0" and also not set at
all ("").

Using VERBOSE with zbeacon always indicate the correct interface being used:

- Without setting or "eth0":

I: 16-11-28 15:30:09 zbeacon: interface=eth0 address=192.168.25.214
broadcast=192.168.25.255

I: 16-11-28 15:30:09 zbeacon: configured, hostname=192.168.25.214


- Setting as "*"

I: 16-11-28 15:25:18 zbeacon: configured, hostname=*


Running sudo netstat -uac while executing tests had the following results:

- No setting ("") - *notice that Recv-Q builds up with time!*:

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
udp     9408      0 192.168.25.255:5670     *:*
udp        0      0 *:bootpc                *:*
udp        0      0 raspberrypi-001:ntp     *:*
udp        0      0 raspberrypi:ntp         *:*
udp        0      0 localhost:ntp           *:*
udp        0      0 *:ntp                   *:*
udp        0      0 *:mdns                  *:*
udp        0      0 *:38304                 *:*
udp6       0      0 [::]:ntp                [::]:*
udp6       0      0 [::]:mdns               [::]:*
udp6       0      0 [::]:43395              [::]:*

- ZSYS_INTERFACE = "*":

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
udp        0      0 255.255.255.255:5670    *:*
udp        0      0 *:bootpc                *:*
udp        0      0 raspberrypi-001:ntp     *:*
udp        0      0 raspberrypi:ntp         *:*
udp        0      0 localhost:ntp           *:*
udp        0      0 *:ntp                   *:*
udp        0      0 *:mdns                  *:*
udp        0      0 *:38304                 *:*
udp6       0      0 [::]:ntp                [::]:*
udp6       0      0 [::]:mdns               [::]:*
udp6       0      0 [::]:43395              [::]:*


The only difference from the netstat output for the QtUdpSocket version is
that the Recv-Q is always zero.

Any tips are welcome...

Thanks!

Rodrigo Madruga.

2016-11-28 13:19 GMT-02:00 Wes Young <wes at barely3am.com>:

> but is that what interface your app is listening (err telling zbeacon to
> listen on) for beacons on?
>
> (in addition in making sure you’re using the latest ver), follow the
> ZSYS_INTERFACE var a bit (it may or may not be set and be associating the
> beacon listener with the correct interface…)
>
> > On Nov 28, 2016, at 9:42 AM, Rodrigo Madruga <
> rodrigo.madruga at nexxtorage.com> wrote:
> >
> > 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
>
> --
> wes
> wesyoung.me
>
>
> _______________________________________________
> zeromq-dev mailing list
> zeromq-dev at lists.zeromq.org
> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>
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