MOSQUITTO.md

Install Mosquitto for your workstation and add devices

• Download the Eclipse Mosquitto CLI for your operating system.
• Ensure that you've updated the properties file for your Watson IoT configuration in local.env.

Connect to IoT Platform and post a message

• First, create the consuming application connection to receive messages from all devices. Open a terminal window and subscribe to the iot-2/type/+/id/+/evt/+/fmt/json topic. Note that this queue format is different from the ones the devices post to because it contains wildcards. Update the topic in local.env file to match.

  source local.env
  mosquitto_sub -d -h "$WATSON_TEAM_ID.messaging.internetofthings.ibmcloud.com" -p 1883 \
  -i "$WATSON_CLIENT" -t "$WATSON_TOPIC" \
  -u "$WATSON_USERNAME" -P "$WATSON_PASSWORD"
  

• Now, open another terminal window and publish a test message onto the Device Type topic. You can find sample messages for 3 devices here. Enter the sample JSON, making sure the Serial matches your Device.

• Set the DEVICE_ID environment variable to d:$WATSON_TEAM_ID:refrigerator-simulator:$DEVICE_1_ID (replacing $DEVICE_1_ID with the value you set in the previous section. This value doesn't have to be added to local.env).

• Set the DEVICE_PASSWORD environment variable to the password or token for that device id. This value doesn't have to be added to local.env).

  source local.env
  export DEVICE_ID=d:$WATSON_TEAM_ID:refrigerator-simulator:1
  export DEVICE_PASSWORD=""
  mosquitto_pub -d -h "$WATSON_TEAM_ID.messaging.internetofthings.ibmcloud.com" -p 1883 \
  -i "$DEVICE_1_ID" -t "iot-2/evt/refrigerator-simulator/fmt/json" \
  -u "use-token-auth" -P "$DEVICE_1_PASSWORD" \
  -m '{"appliance_serial": "aaaabbbbcccc", "part_number": "ddddeeeeffff", "reading": "15", "timestamp": 1466632598}'
  

• Look back in the original terminal window for the subscribing application, and you should see the message has been received.