What port does the Photon use to connect to the Particle Cloud?

[Devin]

@nrobinson2000 try port 5683 for the CoAP service

What technologies used in accessing spark core from cloud

Hey @risingtiger! In order to communicate with the Spark Cloud, the Core opens a persistent TCP socket with the Spark Cloud using an encrypted version of CoAP through outgoing port 5683 on your network. CoAP stands for “Constrained Application Protocol”, and is basically a byte efficient version of HTTP for use in constrained environments, like on itty bitty hardware. Does that help to answer your question?