Q: About the deal
I don’t quite understand the deal here, is this one purchase is per single MQTT Broker/ instance? For example Tier 4, we have single broker with max capacity of 200 connected clients or we can deploy multiple brokers with 200 concurrent clients in total?
ranjith_bevywise
Jun 4, 2025A: Yes. You got it right.
One purchase is for a single instance only. You cannot deploy it in multiple servers.
huynhphuchuyDoes this MQTT Broker system support ACLs and topic ACLs per user/group supported? Since you mentioned data connectors for sending data to different databases, does the system support transforming data from a specific topic to DB schema?
e.g
Data Connector A → Routes `projectA/#` to PostgreSQL (table: temperature_logs)
Data Connector B → Routes `projectB/#` to MongoDB (collection: gps_coords)
(1/2) ACL for the Clients/Topics are supported and can be configured when you add the mqtt authentication keys.
Data Transformation and Cusotmized data storage is supported using a module - Custom Storage. This needs a some custom python coding to achieve this.
The python hook gives you the clientid, topic and message and you can make decisions on where to write based on any one of these data.
(2/2)
You can refer to the developer guide on how to write the custom hook
https://www.bevywise.com/mqtt-broker/python-mqtt-broker-interface.html#CustomDataStore
Does it also support connections via WS and WSS?
Yes. CrystalMQ supports both Websocket - WS & WSS.
Screenshot from the product dashboad.
https://img1.bevywise.com/images/overview-2.png
Refer Documentation - https://www.bevywise.com/mqtt-broker/help.html#user-interface
My last question is: I want to use this broker to send messages to nearly 1,000 mobile devices via MQTT. However, it only supports up to 200 concurrent devices, which seems quite limited to me. Does this mean the broker is only suitable for IoT use cases?
CrystalMQ has been tested for 50,000+ Device connectivity and 2 MB/second data rate on a single instance Ubuntu installation. It also supports clustering and the always available options for large installations.
However the listing done on the AppSumo is capped to 200 Device connectivity for supporting smaller and single instance implementations.
Please contact support@bevywise.com