since .1623
Consuming RO Events from Any Language
Remoting SDK services can be accessed from languages that are not officially supported using the HTTP-based API.
In addition to standard service calls, events are also supported over HTTP.
As a sample implementation, a fully functional chat client was created in PHP without using any Remoting SDK libraries on the client side. The client was generated automatically from the OpenAPI JSON specification.
read in full at Remoting SDK Docs : Consuming RO Events from Any Language