RosarIoT MQTT Brokers are servers for I+D with Eclipse Mosquitto, an open source message broker that implements the MQTT protocol versions 5.0, 3.1.1 and 3.1. Allow to communicate Arduino and ESP8266 devices . The communication is authenticated in our brokers and encrypted under TLS v1.2.
Devices that will publish to brokers, you will need the right libraries for Arduino IDE to encrypt your messages:
WifiClientSecure https://github.com/esp8266/Arduino/tree/master/libraries/ESP8266WiFi
PubSubClient https://github.com/knolleary/pubsubclient