# Weird topic in MQTT explorer - am I spamming broker?

**URL:** <https://discourse.nodered.org/t/weird-topic-in-mqtt-explorer-am-i-spamming-broker/15235>\
**Category:** General\
**Created:** [7 September 2019 13:59 UTC](https://discourse.nodered.org/t/weird-topic-in-mqtt-explorer-am-i-spamming-broker/15235 "2019-09-07T13:59:23Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![877](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/877/32/8207_2.png) [@877](https://discourse.nodered.org/u/877)\
**Post date:** [7 September 2019 17:54 UTC](https://discourse.nodered.org/t/weird-topic-in-mqtt-explorer-am-i-spamming-broker/15235/7 "2019-09-07T17:54:52Z")

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Thanks, I set it to QoS 0 not retain and am experimenting with the results.

I'm noticing an issue in serial monitor which is causing unresponsiveness:  
Attempting MQTT connection...failed, rc=-2 try again in 5 seconds

I think it's due to the number of analogRead's happening in void loop, but I need a lot to get the sample rate.

Looking into it...

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