Subscribe to a Channel Feed
Subscribe to updates from channel feed with MQTT
ThingSpeak™ MQTT supports only QoS 0. For more information,see Server Response for Connections.
channels/ subscribes to
updates to a channel feed. Replace
<channelID> with the
channel ID and
<format> with the format of the return
<channelID> — channelID for the subscription target
Channel ID for the subscription target, specified as a positive integer.
Each ThingSpeak license type allows a different number of concurrent 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 Dataor
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 channel updates from your channel
mqtt3.thingspeak.com and port
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 Client ID: ENTER_MQTT_DEVICE_CLIENT_ID Host: mqtt:// mqtt3.thingspeak.com Port: 1883 Username: ENTER_MQTT_DEVICE_USERNAME Password: ENTER_MQTT_DEVICE_PASSWORD Clean Session: true (for best performance)
In the New Subscription dialog, use the subscribe topic syntax and settings:
Topic: channels/33301/subscribe QoS: 0
Now when data is written to the channel, you can observe the messages in the MQTT X client display.
Introduced in R2017b
Publish to a Channel Field Feed | Subscribe to a Channel Field Feed | Publish to a Channel Feed