# MQTT need to subscribe to receive data?

**URL:** <https://forum.inductiveautomation.com/t/mqtt-need-to-subscribe-to-receive-data/96754>\
**Category:** Ignition\
**Created:** [October 3, 2024, 6:26am UTC](https://forum.inductiveautomation.com/t/mqtt-need-to-subscribe-to-receive-data/96754 "2024-10-03T06:26:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Eugene49](https://avatars.discourse-cdn.com/v4/letter/e/c6cbf5/32.png) [@Eugene49](https://forum.inductiveautomation.com/u/Eugene49)\
**Post date:** [October 3, 2024, 6:26am UTC](https://forum.inductiveautomation.com/t/mqtt-need-to-subscribe-to-receive-data/96754/1 "2024-10-03T06:26:02Z")

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I am trying to recall MQTT basic knowledge.

If "I am" an Ignition edge, and I am publishing a tag that can be read and write by a remote client.

Do I need to subscribe to my own tag to know if someone (a client) made a write to my tag?

Sorry if my question doesn't make sense..  
Goin back to MQTT 101.

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [October 3, 2024, 11:27am UTC](https://forum.inductiveautomation.com/t/mqtt-need-to-subscribe-to-receive-data/96754/2 "2024-10-03T11:27:24Z")

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No, not if using Sparkplug with Cirrus Link products. One gateway can be designating as the controlling gateway, and there's an automatic reverse path for it.