Please consider the following restrictions related to the device connectivity layer.

Service plan

Resource	Description
Number of registered devices per tenant	25 for Free plan unlimited* for Standard plan
Number of messages per tenant per month	100.000 for Free plan 1.000.000.000 for Standard plan
Device connection time per tenant per month (minutes) (relevant only for connection based protocols)	50.000 for Free plan 500.000.000 for Standard plan

*Please take into account, that you can register any number of the devices, the number of simultaneously connected devices is restricted. Please contact us for further information.

Protocol adapters

Resource	Description
Ports used	HTTP: 443 MQTT: 8883 AMQP: 5671 CoAP: 5684
HTTP protocol adapter: request timeout	60 seconds
MQTT protocol adapter: connection inactivity	60 seconds
MQTT protocol adapter: number of allowed connect requests per tenant per second	50 connect requests per second
CoAP protocol adapter: NAT timeout	120 seconds

Payload

Resource	Description
Message size used to calculate service plan quota	2 KB or 4 KB, depending on service plan
Maximum message size for one request	64 KB

General restrictions

Resource	Description
Number of free plans per account	3
Retention policy for events	60 seconds for Free plan 24 hours for Standard plan
Queue size for events	1 MB for Free plan 5 GB for Standard plan
Queue size for telemetry	1 MB for Free plan 2 GB for Standard plan
Maximal number of secrets per credential	10
Maximal number of CA certificates per tenant	5
Maximum number of credentials per device	10
Supported algorithms for CA public keys	RSA, ECDSA
Minimal length for CA public keys	RSA: 2048, ECDSA: 256
Maximal length for CA public keys	RSA: 4096, ECDSA: 384