There is a signal strength indicator in DB when looking at devices in the details page. It is actually doing the opposite of what I thought.
I have distant lamp dimmer (furthest from the hub) that seems to react slowly to commands. I installed a Z-Wave Plus receptacle switch midway in distance between the hub and the lamp. My hope was to use it just as a repeater in the mesh.
The next day I checked the signal strength. It actually lowered the strength from 4DB to -6DB. Similarly, a table lamp dimmer located just 15 feet from the hub with no obstructions went from 3DB to -1DB.
Am I interpreting wrongly what the DB level means?
I have several locations where I can install my C7. Is it a good idea that I can try each location and shoot for the one with the highest overall DB values? Do I need to wait 24 hours or whatever before the DB values are updated?
Possibly. There are a variety of measurements taken in dB, and a measurement in dB (as opposed to dBi, or dBm) is just a relative measurement between two undefined things, but not a well defined metric like dBm or Watts. RSSI which is commonly shown in the Zwave and Zigbee pages is just a measure of relative signal quality, NOT a measure of signal power (EiRP) or Carrier to Noise. There are different definitions in use by different manufacturers, so I would consider it an indicator as opposed to a truth.