Why do you only allow telemetry >= 10?

[TheCherry]

Is there any special reason for this limitation?

Tasmota/tasmota/tasmota_support/support_command.ino

Line 2419 in 4b06cb2

Settings->tele_period = 10; // Do not allow periods < 10 seconds

[sfromis]

One reason for a lower bound is about what devices can handle, not all can "survive" a lot of activity.

On a more general level, if you think that you need fast data, maybe the concept of fixed-period telemetry messages is not "the solution".

Like the typical use case of energy monitoring data for devices being switched on/off, or otherwise varying significantly in power draw. Here, Tasmota has the PowerDelta feature allowing you to control thresholds for when to report, which makes a lot more sense than wanting messages, say, every second.

In other words, maybe the device should be able to decide when it is "worth it" to report data.