Hello, there
I found an issue which pushed me to migrate all my ZigBee sensors to zigbee2mqtt and gave up with using HE for sensors
I have integration with Grafana to monitor sensors data and found very convenient to have real data points, sent by devices, and is very confusing when data pulled from Maker API
You can use the maker API to poll from another system for this information. But the maker API is reactive. It doesn't initiate the transfer of information. Another system would have to poll for it.
Not to my knowledge. The MakerAPI reports for that instant. So, if your device polls every 30 seconds, you would have to poll the maker api every 30 seconds.
HE is event-based and not a true data acquisition solution. The way folks address this is typically using node-red and influxdb to stuff values in periodically if they haven't changed by an event recently. Check out the MakerAPI node-red influxdb thread for more info.
When sensor sending value to HE - that value is being kept by the driver for the time until next value arrived.
So when you decide to pull that value via Maker API - it'll be exposed every time. And there is no way to understand if this value new or still old.
Unless driver implements timestamp.
I don't know if this is helpful but I've been logging data for some days now using Node-RED and a PC. I don't think the collecting device (in my case a PC) is limited to any particular type. You might even be able to log to a NAS. The data does come through with a timestamp. See this post: Log Data