Limits

Sending

Limit	Value
Message size	16 KB
Entries in one buffered array	200
Burst per machine	120 messages, then about one a second
Usual rate	One message every 30 seconds per machine
Oldest ts accepted	24 hours before arrival
Newest ts accepted	5 minutes after arrival
Text reading	200 characters
Reading key	Lowercase letters, digits and _, up to 40 characters
MQTT connections per machine id	1
MQTT keepalive	60 seconds recommended, 300 at most

A ts outside the window is replaced by arrival time, not refused.

Reading data back

Limit	Value
Raw readings per request	31 days
Hourly or daily averages per request	400 days
Rows per request	50,000
Alerts per request	The most recent 200

Credentials

Event	Takes effect
New machine password issued	The old one stops within a minute
API key revoked	On the next request
Emailed sign-in link	Works once, for 15 minutes
Invitation	7 days

Alerts

Limit	Value
Alert emails per company	30 an hour
Reopen window	5 minutes
Webhook timeout	10 seconds, no retry