Bluetooth signal strength phone

I have been trying to get bluetooth working with my phone, nothing seems to work properly. Sure there are nodes which indicate true or false if phone is in range. What I would like to do is measure the signal strength of my (or family mamber) bluetooth phone signal, if in range of the raspberry pi measure the signal. I have a PI controlling an electric lock, so if the signal is strong the lock will open.
What is the best node to use for this?

There is no "best node" for it. Instead you could look into this project, You would run this outside of Node-RED and communicate result with Node-RED via MQTT. Works very well, have it running since years. In the article there is a good description of the method for detection of phones.

I would also recommend you to buy an external BT dongle instead of using the RPi builtin

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