I have recently run into several situations where the WiFi network at a site does not have the required CoAP port(s) open. I try to explain what is required, but often get told, “We don’t stop anything” only to subsequently (after several hours) learn there actually is something blocking that port.
Is there a simple technique (via Terminal on my MacBook Pro) for checking to see if the required CoAP port is open? I can easily put my laptop on the subject WiFi network but currently don’t have a technique to see if I can make a connection to the Particle cloud via CoAP. I read somewhere recently that using telnet and specifying the URL and appropriate port # might be an approach.
I also don’t want to go through the hassle of pushing diagnostic software onto the Particle device. Proving the connection status via a laptop will be easier and more “trusted” by those unfamiliar with Particle.