Hi,
I have some Shelly devices configured in HA (communicating by WiFi). Can I switch off the Shelly Webmin Bluetooth bluetooth?
Where is the Bluetooth (and RPC) needed for? Only for onboarding?
Can anyone explain please, I tried to by searching the internet, but It doesn´t clearify anything for me, please help.
I have shut off Bluetooth on my Shelly devices after they are working in home assistant (via WiFi). I think Bluetooth can be used on the newer generation of Shelly BLU devices for discovery and communication between Shelly devices but I don’t use this.
Thank you for your response @MaxK, it’s appreciated! I switched them off, just to be sure.
Does anyone can explain me why/if it is used for (battery powered/non battery powered devices)?
I think for this: Shelly BLU Gateway – Control Your Home With Smart Devices
I recently got one one of those, but I suspect it is for Shelly BLU devices with no Wifi capabilities, only bluetooth (like the BLU Motion and BLU Door/Window for example) to act as a gateway. I do have those BLU sensors but using them by using ESPHome Bluetooth proxies.
What I’m trying to figure out if my new Shelly Smoke sensor needs to have bluetooth enabled to communicate reliable to my HA setup.
I have a Shelly Smoke that works fine on my wifi only.
Okay! How often does it updates the configured entities? How did you test it?
See here: Shelly Smoke won't update - #4 by MaxK.
In summary, since it is a battery device, it updates when there is a change of state (alarm, battery level change, wake to config, battery replacement). The only way to test is to buy a can of smoke used for testing smoke detectors and spray the smoke into the detector.
I read the topic you mentioned, it clarifies the most of my questions. Thanks for that!
The only thing I keep asking myself, If I enable the Bluetooth on the smoke sensor, will it act as a secondary report when WiFi is down and do I have to enable Bluetooth rpc?
How does that work?
I know I am late to the party, but note that the Shelly Integration in Home Assistant ( For devices like PM, Pro PM, Smoke, etc etc etc) does not use Bluetooth and will not use Bluetooth as a secondary connection. It detects Shelly devices via your network (either ethernet or wifi depending on the Shelly device). I would turn all unwanted radios off as a security precaution. So in this case, if your Shelly is on your WiFi network, have the Bluetooth turned off. If your Shelly is on Ethernet, have both WiFi and Bluetooth turned off. Shelly doesn’t use any secondary links for Home Assistant. Shelly devices are not really designed as mission critical devices either, so they should be used as though they are a single point of failure. Shelly Smoke, as an example, should always be used with another quality smoke detector, only using the Shelly Smoke as a notification device rather than your primary device.
Thank you @brendan for your clear explanation! 
EDIT: Marked it as Solution
I am running a lot of Govee Bluetooth thermometers (H5075) in all bedrooms and some other rooms. I have a Sense Bluetooth USB that advertised 90M range, but was having problems connecting to my H5075s at the farthest points in my house - I enabled the bluetooth gateway on all 5 of my Shelly devices and I now can move the H5075s anywhere in the house. All now show up under Bluetooth in HA.