# Question regarding MQTT communication in MQTT nodes

**URL:** <https://discourse.nodered.org/t/question-regarding-mqtt-communication-in-mqtt-nodes/54213>\
**Category:** General\
**Created:** [24 November 2021 14:51 UTC](https://discourse.nodered.org/t/question-regarding-mqtt-communication-in-mqtt-nodes/54213 "2021-11-24T14:51:32Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [24 November 2021 17:18 UTC](https://discourse.nodered.org/t/question-regarding-mqtt-communication-in-mqtt-nodes/54213/5 "2021-11-24T17:18:50Z")

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If you're being super-pedantic 🕶 - it's 4 bytes of keepalive data - which is wrapped in a TCP packet so about 70 bytes one way and 66 bytes tcp ack back.

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