[Buildroot] Buildroot 2018.02 Mosquitto v1.4.15 : no CONNECT/CONNACK on libmosquitto

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello,

On Tue, 27 Mar 2018 17:46:57 +0200, Alexis Lothor? wrote:

> I have been using libmosquitto in C for quite some time in buildroot (used
> in an EFL mainloop) and it works well. Here are some quick details about
> how I currently use it :
> * C API to create a client
> * I use callbacks API to set callbacks on logs, connect/disconnect events,
> publish/susbscribe events and so on
> * connection uses TLS (certificate provided to API)
> * once connected, Mosquitto file descriptor is provided and integrated to
> EFL main loop
> 
> I recently switched to buildroot 2018.02 (it has upgraded mosquitto from
> v1.4.14 to v1.4.15), and I am now encountering a new issue with the lib.
> Trying to establish a new connection to my broker (using the
> mosquitto_connect API), I can see that a new TCP connection is opened onto
> the broker, but it seems that no MQTT data is transfered (i.e. no CONNECT
> event), so the broker, of course, does not answer the usual CONNACK
> (observed with tcpdump).
> I have made sure that the issue only happens in v1.4.15. Quickly taking a
> look on Eclipse Github, I saw no specific issue directly linked to this
> problem.
> Before diving more in depth in this issue on mosquitto code, I would like
> to ask here : is there anyone encountering the same issue with this new
> mosquitto version ? I did not see any comment about this in the mailing
> list, but maybe the release is too young so it has not been detected yet ?
> Or anyone can confirm that this new version, used as client with C API,
> works on its side ?

Did you try reverting commit f4df4a18e5dd4702f842e61ee815f13afd93c366,
to bring back mosquitto to the 1.4.14 version ?

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com