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Re: [mosquitto-dev] Connect behavior
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Hi Roger,
Thank you for your prompt answer. Your bet is correct, I do not see this first socket connection anymore when calling loop_start after connect_async.
Thanks again,
Philippe
-----Original Message-----
From: mosquitto-dev-bounces@xxxxxxxxxxx <mosquitto-dev-bounces@xxxxxxxxxxx> On Behalf Of Roger Light
Sent: Thursday, 2 May 2019 16:01
To: General development discussions for the mosquitto project <mosquitto-dev@xxxxxxxxxxx>
Subject: Re: [mosquitto-dev] Connect behavior
Hi Philippe,
This shouldn't be behaving like this but that aside, my bet is that if you run connect first and then loop_start you won't see the spurious connect.
Regards,
Roger
On Thu, 2 May 2019 at 10:55, Philippe Willems <philippe.willems@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> I use successfully the mosquito library (version 1.6) in my application with the threaded model.
>
> Everything works fine, except one strange behavior of the library. Sometimes, when the client connects to the broker, there is a first TCP SYN sequence sent by the library but without the CONNECT request. Then, after the timeout, this first TCP socket is closed by the library and a second TCP SYN is sent. In this second socket, the CONNECT request is correctly sent and everything works fine.
>
> I use the following mosquito API to set up the connection, no TLS, no username/password.
>
> mosquitto_lib_init()
> mosquitto_new()
> mosquitto_loop_start()
> mosquito_connect_async()
>
> Here is a copy of TcpDump showing this unexpected behavior.
>
> No. Time Source Destination Protocol Length Info
> 1 0.000000 192.168.42.3 188.118.5.138 TCP 74 53834 → 1883 [SYN] Seq=0 Win=29200 Len=0 MSS=1460 SACK_PERM=1 TSval=5953010 TSecr=0 WS=8
> 2 0.019312 188.118.5.138 192.168.42.3 TCP 74 1883 → 53834 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1452 WS=256 SACK_PERM=1 TSval=3637253104 TSecr=5953010
> 3 0.021792 192.168.42.3 188.118.5.138 TCP 66 53834 → 1883 [ACK] Seq=1 Ack=1 Win=29200 Len=0 TSval=5953036 TSecr=3637253104
> 4 0.997223 192.168.42.3 188.118.5.138 TCP 66 53834 → 1883 [FIN, ACK] Seq=1 Ack=1 Win=29200 Len=0 TSval=5954012 TSecr=3637253104
> 5 1.000619 192.168.42.3 188.118.5.138 TCP 74 53836 → 1883 [SYN] Seq=0 Win=29200 Len=0 MSS=1460 SACK_PERM=1 TSval=5954015 TSecr=0 WS=8
> 6 1.015894 188.118.5.138 192.168.42.3 TCP 66 1883 → 53834 [ACK] Seq=1 Ack=2 Win=66048 Len=0 TSval=3637253204 TSecr=5954012
> 7 1.019364 188.118.5.138 192.168.42.3 TCP 66 1883 → 53834 [FIN, ACK] Seq=1 Ack=2 Win=66048 Len=0 TSval=3637253204 TSecr=5954012
> 8 1.021805 192.168.42.3 188.118.5.138 TCP 66 53834 → 1883 [ACK] Seq=2 Ack=2 Win=29200 Len=0 TSval=5954036 TSecr=3637253204
> 9 1.026273 188.118.5.138 192.168.42.3 TCP 74 1883 → 53836 [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1452 WS=256 SACK_PERM=1 TSval=3637253204 TSecr=5954015
> 10 1.028782 192.168.42.3 188.118.5.138 TCP 66 53836 → 1883 [ACK] Seq=1 Ack=1 Win=29200 Len=0 TSval=5954043 TSecr=3637253204
> 11 1.031684 192.168.42.3 188.118.5.138 MQTT 101 Connect Command
> 12 1.050238 188.118.5.138 192.168.42.3 MQTT 70 Connect Ack
> 13 1.052704 192.168.42.3 188.118.5.138 TCP 66 53836 → 1883 [ACK] Seq=36 Ack=5 Win=29200 Len=0 TSval=5954067 TSecr=3637253207
>
> Is this something known?
>
> Regards,
>
> Philippe
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