SEMP : Can I get messages from a Queue or a topic with curl?

Just for completeness… you can use REST to get messages off a queue. Just not with GET. But you can configure the broker to POST or PUT messages in a queue to any URL… a webhook. So you can’t use curl for that (as curl is a client), but any web server or service that can accept incoming REST POSTs and PUTs could drain messages from a Solace queue.