Update README

README.md

@@ -1,17 +1,39 @@
 ## Gatekeeper - Door access system
-Status: WIP - not prod ready
+#### Status: WIP - getting there o.o
 
-Dev with `nix develop`   
-sync python deps with `uv sync`   
-start dev server `uv run fastapi dev`   
-Swagger UI @ http://127.0.0.1:8000/docs  
-start prod server `uv run fastapi run`
+Start prod server `nix run`<br>
+Start dev server `nix run .#dev` or  `nix run .#dev -- {args}`<br>
+Interactive dev with `nix develop`, then sync deps with `uv sync`<br>
+Swagger UI @ http://127.0.0.1:8000/api/v1/docs<br>
+OpenApi @ http://127.0.0.1:8000/api/v1/openapi.json<br>
 
-You need to set services.pcscd.enable = true; for the smartcard reader to work
+#### Config:
 
-Issues:
+Nixos config for the card reader:
+```
+services.pcscd = {
+  enable = true;
+  plugins = [ pkgs.acsccid ]; #<-- Needed for the ACE1552U
+};
+```
+
+This application is configured using env vars. You can use `cp .env.example .env` and then edit `.env` to change the keys to something else.
+
+
+### A note on keycard scanners
+I have tried two scanners while developing this project, the TWN4 MultiTech 2 from elatec and the ACR1552U from acs.<br>
+##### TWN4
+From the factory the TWN4 comes with firmware that emulates a HID and just inputs the serial of any scanned card. To be usable with pcscd it had to be flashed with the `TWN4_xPx520_S1SC161_Multi_CCID_1Slot_Standard.bix` firmware found in the `TWN4DevPack520` which can be downloaded under https://www.elatec-rfid.com/int/elatec-software (They send you a download link via email).
+This software seems to not work under wine. I had to setup a win10 vm and pass the usb to be able to flash.<br>
+Range: In my testing the TWN4 has a range of about 22mm when interfacing with our Mifare DESFire v2 cards. This is not enough for our idea of mounting the scanner on the inside of a glass window.
+
+#### ACR1552U
+The ACR1552U comes preloaded with PC/SC firmware. You need to install the acsccid package with your package-manager of choice (Nixos user see above) for the scanner to work but after that I had no problems with the hardware interfacing.<br>
+Range: The range of the ACR1552U was much better at over 60mm (almost 70mm if you take of the face plate) 
+
+
+#### Issues:
    - documentation missing
-   - `nix run` currently broken
    - raspberry pi image not working
    - no door state
    - no door operations