ThingSpeak just announced that they added MQTT as a way to send data to a ThingSpeak channel. This is great news since a lot of devices support MQTT. If you don’t have a device, but want to try out the MQTT protocol with ThingSpeak, you can use a desktop application called MQTT.fx. In this example, I am going to explain how to use MQTT.fx to send data to a ThingSpeak channel.
- Sign up for ThingSpeak (or log in if you have an account)
- Create a new channel
- Note the Channel ID and Write API Key
- Download and install MQTT.fx.
- Configure the connection profile for the desktop MQTT client.
- Broker Address: mqtt.thingspeak.com
- Broker Port: 1883
- Click Connect to connect to the ThingSpeak MQTT broker.
- Enter the topic channels/<channelID>/publish/<apikey> to publish data to a channel feed. Replace <channelID> with the channel ID and <apikey> with the write API key of the channel. Enter the message to publish to the channel feed. This PUBLISH message publishes a value of 45 to field 1 and 60 to field 2 of the specified channel, along with a status message MQTTPUBLISH.
- Alternatively, you can enter the topic channels/<channelID>/publish/fields/field<fieldnumber>/<apikey> to publish to a channel field. Replace <channelID> with the channel ID, <fieldnumber> with field number that want to update, and <apikey> with the write API key of the channel. Enter the message to publish to the channel field. This PUBLISH message publishes a value of 45 to field 1 of the specified channel.
- MQTT Basics – Learn about the publish/subscribe architecture for connecting bandwidth and power-constrained devices over wireless networks
- MQTT Client Configuration – Learn how to set up an MQTT client to communicate with the ThingSpeak MQTT broker
- Choose Between REST and MQTT – Learn when to use REST and MQTT to update a channel