# MQTT Server MQTT server: * mqtts://mqtt-dev-server.westus2-1.ts.eventgrid.azure.net * port: 8883 # Getting server certificate: openssl s_client -showcerts -connect mqtt-dev-server.westus2-1.ts.eventgrid.azure.net:8883 /dev/null|openssl x509 -outform PEM >eventgrid.azure.pem This produces eventgrid.azure.pem certificate file. openssl s_client -showcerts -connect www.bigfoot-inc.com:443