[zeromq-dev] odd error from pyzmq

[Jerry Scharf]

Osiris,

(slap forehead with palm) That explains it... thanks for the quick help.

jerry

On 02/26/2016 11:59 AM, Osiris Pedroso wrote:
> Isn't the problem that both sides are binding?
> I believe one side should bind, the other should connect.
>
> On Fri, Feb 26, 2016 at 1:15 PM Jerry Scharf 
> <scharf at lagunawayconsulting.com 
> <mailto:scharf at lagunawayconsulting.com>> wrote:
>
>     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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