mqtt simple not working with test.mosquitto.org

[kamacode]

I am using my own MQTT server, MQTT simple works well

then I am testing test.mosquitto.org send works from PC :

mosquitto_pub -h test.mosquitto.org -p 1883 -t etrog/device-359779080193747 -m world

mosquitto_sub  -t "etrog/device-359779080193747" -h test.mosquitto.org

works well

then I am setting the connection parameters as such: 

but it fails to sent MQTT with the following error:

as you can see from log it finds the IP address. but for some reason the send fails 

please assist 

[Albrecht Markus Schellenberger]

Hello Ilan,

<inf> mqtt_simple: MQTT PUBLISH result=0 len=350

As you can see in your log, the publishing message size is 350. So you have to increase the payload buffer in prj.conf:

CONFIG_MQTT_PAYLOAD_BUFFER_SIZE=350

Regards,

Markus