[feature] maxHeartbeatsPerSec as a decimal number like 0.5 for heartbeat every 2 seconds (or more)

[Cyrille37]

Hi
Thanks a lot for this application, it's really useful and seems to be well realized. 💌

Just to say that sending heartbeat every second is perhaps too much... If heartbeats are stored in data I would like to configure recording data every 2 seconds or more. But perhaps heartbeats are not recorded ...

Regards & cheers.