Further reading

• Official MQTT FAQ: https://mqtt.org/faq
• MQTT OASIS announcement: https://www.oasis-open.org/news/pr/oasis-mqtt-internet-of-things-standard-now-approved-by-iso-iec-jtc1
• Article about MQTT being used by Facebook Messenger: https://mqtt.org/2011/08/mqtt-used-by-facebook-messenger
• Pub-sub client: https://github.com/knolleary/pubsubclient
• Emoji table: https://apps.timwhitlock.info/emoji/tables/unicode
• List of free MQTT servers: https://github.com/mqtt/mqtt.github.io/wiki/public_brokers
• Google Cloud IoT: https://cloud.google.com/solutions/iot
• Mosquitto—open source MQTT server to run locally: https://mosquitto.org/
• shiftr.io—cloud-based MQTT server and visualization tool: https://shiftr.io/
• MQTT Dash—Android app: https://play.google.com/store/apps/details?id=net.routix.mqttdash&hl=en
• Arduino-MQTT—Arduino library for MQTT: https://github...