Azure Service Bus vs Mosca: What are the differences?
Azure Service Bus: Reliable cloud messaging as a service (MaaS) *. It is a cloud messaging system for connecting apps and devices across public and private clouds. You can depend on it when you need highly-reliable cloud messaging service between applications and services, even when one or more is offline; *Mosca:** A Node.js MQTT broker. A Node.js MQTT broker, which can be used as a Standalone Service or embedded in another Node.js application.
Azure Service Bus and Mosca can be primarily classified as "Message Queue" tools.
Mosca is an open source tool with 2.88K GitHub stars and 505 GitHub forks. Here's a link to Mosca's open source repository on GitHub.