Re: [mosquitto-dev] Mosquitto pub/sub problem

[Roger Light <roger@xxxxxxxxxx>]

Hi Guy,

You need to run the subscribe before the publish, otherwise it isn't
there to receive the message. If there are no subscribers on a topic
the message isn't stored in case any connect.

For 1.3.1 you need c-ares installed. On Debian based systems this is
available by installing the packages

libc-ares-dev
libc-ares2

Alternatively you could compile with

make WITH_SRV=no

Regards,

Roger


On Wed, Apr 30, 2014 at 10:15 AM, Guy Dillen <guy.dillen@xxxxxxxxx> wrote:
> Hi Roger,
>
> Thanks.
>
> Please see repost:
>
> root@clanton:~# mosquitto_pub -d -t sensors/value -m "test"
> Client mosqpub/1869-clanton sending CONNECT
> Client mosqpub/1869-clanton received CONNACK
> Client mosqpub/1869-clanton sending PUBLISH (d0, q0, r0, m1,
> 'sensors/value', ... (4 bytes))
> Client mosqpub/1869-clanton sending DISCONNECT
>
> root@clanton:~# mosquitto_sub -d -t sensors/value
> Client mosqsub/1884-clanton sending CONNECT
> Client mosqsub/1884-clanton received CONNACK
> Client mosqsub/1884-clanton sending SUBSCRIBE (Mid: 1, Topic:
> sensors/value, QoS: 0)
>
>
>
> I tried building 1.3.1 but gives build errors:
>
> root@clanton:~/mosquitto-1.3.1# make
> make: Warning: File `config.mk' has modification time 2724955 s in the
> future
> set -e; for d in lib client src; do make -C ${d}; done
> make[1]: Entering directory `/home/root/mosquitto-1.3.1/lib'
> make[1]: Warning: File `../config.mk' has modification time 2724955 s in
> the future
> cc -Wall -ggdb -O2  -I. -I.. -I../lib -fPIC -DWITH_TLS -DWITH_TLS_PSK
> -DWITH_THREADING -DWITH_SRV -c mosquitto.c -o mosquitto.o
> In file included from mosquitto.c:46:0:
> mosquitto_internal.h:51:20: fatal error: ares.h: No such file or directory
>  #  include <ares.h>
>                     ^
> compilation terminated.
> make[1]: *** [mosquitto.o] Error 1
> make[1]: Leaving directory `/home/root/mosquitto-1.3.1/lib'
> make: *** [mosquitto] Error 2
>
> Thanks.
>
> Guy
>
> On 30/04/14 11:04, "Roger Light" <roger@xxxxxxxxxx> wrote:
>
>>Hi Guy,
>>
>>
>>> mosquitto_pub -d -m "Test" -t sensors/value
>>>
>>>
>>> Output:
>>>
>>> Client mosqsub/1896-clanton sending CONNECT
>>> Client mosqsub/1896-clanton received CONNACK
>>> Client mosqsub/1896-clanton sending SUBSCRIBE (Mid: 1, Topic:
>>>sensors/value,
>>> QoS: 0)
>>>
>>>
>>> Anyone an idea what goes wrong here?
>>
>>You've posted the wrong output - both _sub and _pub have the same
>>process id (1896) which isn't possible.
>>
>>Could you repost?
>>
>>I'd suggest building 1.3.1 as well, rather than 1.2.3.
>>
>>Cheers,
>>
>>Roger
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>
>
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