Use limitations

EMQX Cloud has fewer usage restrictions than the public cloud IoT Hub platform. The limitations in the table below depend on the number of connections purchased and the hardware performance, and the corresponding parameters have been rigorously tested for performance by EMQ officials.

The performance of the relevant items depends on the deployment specifications, and the specific data is subject to actual usage scenarios.

Connected Communications

Limitation Description	EMQX	Public Cloud IoT Hub
The maximum number of simultaneous online long connections	Depends on specifications, choose from 1000-10M+, more than 200K please send tickets for application	10K-500K
Number of connections established per second	10K	200-500
Number of topics subscribed to by a single client	Unlimited	10-100
Single-client subscription requests per second	Unlimited	10-10K
Single-client upstream message speed	Unlimited	QoS0: 30 messages/sec；QoS1: 10 messages/sec；QoS2: Not supported
Single-client message downstream	Unlimited	50-100 messages/sec
Single client throughput bandwidth per second	Unlimited	512-1024KB
Single message length	Default 1024KB 1-256MB. Adjustable on request	256KB
Maximum offline message storage length	Unlimited	1 week

Topic Limitation

Limitation Description	EMQX	Public Cloud IoT Hub
Topic number	Unlimited	50 single product
Permissions	Customize	Devices can only subscribe to a limited number of their own Topics for message distribution
Subscribe/unsubscribe response time	Immediate	5-10 sec