A1.1 Open communication protocol
The protocol is open, free, and universally implementable Learn more
'A1.1. Open communication protocol' definition and examples
The protocol is open, free, and universally implementable Learn more
HTTP has been in use by the World-Wide Web since 1990.
RFC2616 (1999)Hypertext Transfer Protocol over TLS (HTTPS). HTTP [RFC2616] was originally used in the clear on the Internet. However, increased use of HTTP for sensitive applications has required security measures.
RFC2818 (2000)The Simple Mail Transfer Protocol (SMTP) is a communication protocol for electronic mail transmission. As an Internet standard, SMTP was first defined in 1982 by RFC 821, and updated in 2008 by RFC5321
Do you use email?MQTT (MQ Telemetry Transport) is an open OASIS and ISO standard (ISO/IEC PRF 20922) lightweight, publish-subscribe network protocol that transports messages between devices. MQTT
ISO/IEC PRF 20922