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Subscribe to a Channel Field Feed

Subscribe to channel updates from specific field of channel with MQTT

ThingSpeak™ MQTT supports only QoS 0.


channels/<channelID>/subscribe/fields/field<fieldnumber> subscribes to updates from a single field of a channel feed. Replace <channelID> with the channel ID and <fieldnumber> with the target field number.

channels/<channelID>/subscribe/fields/+ subscribes to updates to all fields of a channel feed from the specified channel.

Input Arguments

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Channel ID for the subscription target, specified as a positive integer.

Field number of the subscription target, specified as a positive integer.


  • Each ThingSpeak license type allows a different number of MQTT subscriptions and has different restrictions on the number of messages delivered. For more information, see How to Buy and Frequently Asked Questions.

  • MQTT subscriptions do not report updates to the channel from Bulk Write JSON Data or Bulk Write CSV Data.

  • ThingSpeak MQTT honors all MQTT disconnect and unsubscribe messages. If you disconnect from the MQTT server, you are automatically unsubscribed from channel updates.


Configure MQTT X to subscribe to updates of field1 from your channel 33301 using and port 1883.

In the New Connection dialog, use the following connection settings, along with client ID, username, and password derived when the MQTT device was created in ThingSpeak:

Name: MyChanName
Host: mqtt://
Port: 1883
Clean Session: true (for best performance)

In the New Subscription dialog, use the subscribe topic syntax and settings:

Topic: channels/33301/subscribe/fields/field1
QoS: 0

Now update the field with a publish, and observe the message received in the client from the subscription.