I’m stuck at the moment and need some help please. I’m having trouble displaying data with Grafana. In InfluxDB I see that the data is being scraped.
When I click ’ select measurement ’ in Grafana, the field comes up empty there is nothing to select. So no pretty graphs. 
Any help would be appreciated. Thanks for reading.
You have the location specified but it doesn’t look like you have the measurement ‘dBm’ selected (assuming your RSSI is in dBm since mine are).
Type in dbm; you might have to ‘remove entry’ in the where box
In the box above your dropdown menu, type in “dbm”. Mine did not list it in the dropdown either but was there if it typed in dbm.
Still no luck with this.
The entity_id field comes up empty.
If I input the entity_id, still no go.
The issue might be this ? In Developer Tools, the unit of measurement is empty for all the entities WiFi status. Why is it showing in InfluxDb though ??
Need to assign it a measurement value somehow I think ???
You can assign a unit of measure via the customize.yaml.
You have a different datasource than HomeAssistant, you have ‘autogen’.
Could you give me an example how please ? Do you do all of them individually ?
Success… 
… thank you
I put this into configuration.yaml and it now works.
sensor:
- platform: mqtt
name: "Tasmota Wi-Fi Quality"
state_topic: "tele/tasmota/STATE"
unit_of_measurement: "%"
value_template: "{{value_json['Wifi'].RSSI }}"
availability_topic: "tele/tasmota/LWT"
payload_available: "Online"
payload_not_available: "Offline"
device_class: signal_strength
Thanks for helping and hopefully I can return the favour one day. 
Is it actually in percentage or is it supposed to be dBm. You can make it anything you want. I never thought to do it that way, it looks good. Glad I could help.
I have this to graphically indicate whether something is connected or not.
Next step is to get rid of the ‘mean’ and replace it with the entity name; if that’s possible. Just starting out with HA. Thanks again and all the best.
For almost all of my graphs, I use last and Last (not null).
