[zeromq-dev] odd error from pyzmq

[Jerry Scharf]

Hi,

That's not it. I added a gethostbyname to the code, that works but the 
bind still fails. I did a simple socket connect to the host/port in 
python and that works fine (no error, netstat shows the connection.)

I think the code is pretty generic, I tried to keep it as simple as 
possible to start with.

Here's master (client) side code:

     cmdsock = zc.socket(zmq.REQ)
     evsock = zc.socket(zmq.SUB)


     cmdport = 10011
     subport = 10012

     hostip = socket.gethostbyname(hostname)
     evconn = "tcp://{}:{}".format(hostip, subport)
     evsock.bind(evconn)
     cmdconn = "tcp://{}:{}".format(hostname, cmdport)
     cmdsock.bind(cmdconn)


here's the listener side code

     mzcontext = zmq.Context()

     rrportnum = 10011
     psportnum = 10012

     rrsock = mzcontext.socket(zmq.REP)
     rrsockstr = "tcp://*:{0}".format(rrportnum)
     rrsock.bind(rrsockstr)

     pssock = mzcontext.socket(zmq.PUB)
     pssock.bind("tcp://*:{0}".format(psportnum))


On 02/26/2016 12:16 AM, MinRK wrote:
>
> Typically, with bind you want an IP address. Often a domain works, but 
> it requires that zeromq can resolve that domain to a /local/ IP 
> address of the machine. This won’t work, for instance, if your 
> raspberry pi is behind a router. You can listen on all IPs by using 
> |'tcp://*:10011'|.
>
> -MinRK
>
> On Fri, Feb 26, 2016 at 1:11 AM, Jerry Scharf 
> <scharf at lagunawayconsulting.com 
> <mailto:scharf at lagunawayconsulting.com>> wrote:
>
>     Hi,
>
>     I'm working further into things. I have the raspberry pi side working
>     happily and am now trying to get the ubuntu master side working. I am
>     running python 3.4 and did the install from pip with no errors. (I am
>     running python2.7 on the pi side to get spi routines...)
>
>     The socket create works fine, but wen I try to bind to my host as a
>     fully qualified hostname:port (in this case
>     "bank0pi.lt.in.finsix.com:10011
>     <http://bank0pi.lt.in.finsix.com:10011>" I get this stackdump:
>
>     File "/home/jerry/finsix/marathon/master/simple/m_zmq.py", line 29, in
>     bank_setup
>         evsock.bind(evconn)
>        File "zmq/backend/cython/socket.pyx", line 487, in
>     zmq.backend.cython.socket.Socket.bind
>     (zmq/backend/cython/socket.c:5156)
>         File "zmq/backend/cython/checkrc.pxd", line 25, in
>     zmq.backend.cython.checkrc._check_rc
>     (zmq/backend/cython/socket.c:7535)
>     zmq.error.ZMQError: No such device
>
>     What device is it looking for?? I check with host and the name
>     resolves
>     fine.
>
>     tia,
>     jerry
>
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>
> ​
>
>
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