Update readme

README.md

@@ -23,7 +23,7 @@ A stechuhr client consists of:
 - 1x M301 Mifare Card Reader with USB _mini_ B
 - 1x USB mini B to USB A cable
 - 1x short RJ-45 patch cable
-- **TODO:** Add Speaker/Buzzer to additionally allow for acoustic feedback as demanded by security personal, maybe make this switchable via config/toggle switch to avoid annoying people?
+- (Optional): Speaker/Buzzer to additionally allow for acoustic feedback, switchable via config/toggle switch to avoid annoying people
 
 | without raspi + reader |
 | ---- |
@@ -38,16 +38,17 @@ A stechuhr client consists of:
 | Network | Neutrik Network connector | Raspi Network Connector | Short RJ-45 Patch cable |
 | Mifare Reader | USB A jack Raspi | USB mini B jack Mifare reader | USB-A to USB mini-B cable |
 | LED module 5V | Raspi GPIO 5V | 5V WS2812 Module (if more than 1 LED is used consider connecting this to the external PSU 5V) | Jumpercable with female pinheader on one side, soldered on the other |
-| LED module GND | Raspi GPIO GND | 5V WS2812 Module | Jumpercable with female pinheader on one side, soldered on the other |
+| LED module GND | Raspi GPIO GND | GND WS2812 Module | Jumpercable with female pinheader on one side, soldered on the other |
 | LED module PWM | Raspi GPIO 10 | D2 WS2812 Module | Jumpercable with female pinheader on one side, soldered on the other |
 | Buzzer + | Raspi 5V | Buzzer + | Jumpercable with female pinheader on one side, soldered on the other |
 | Buzzer - | Buzzer Amp Module | See drawing |  |
 | Buzzer Amp GND | Raspi GND | See drawing |  |
 | Buzzer Amp Signal | Raspi GPIO 18 | See drawing |  |
 
-
 ![](images/gpio.png)
 
+^ GPIO for RASPI v1 (!)
+
 ![](images/buzzer-amp.jpg)
 Resistor is 100k
 
@@ -105,7 +106,7 @@ journalctl -fu stechuhr
 ## Todo
 
 - [ ] Blink red forever if server cannot be reached
-- [ ] Add acoustic feedback
+- [x] Add acoustic feedback
 
 ## Configuration
 
@@ -126,7 +127,7 @@ in `config.toml` there are three keys that identify a stechuhr.:
 
 ### ID verification
 
-in `config.toml` you can add a list of regex patterns that stechuhr (*both on server and on client!*) uses to verify the Card IDs. These two patterns for example allow upper/lowercase hex strings with lengths either between 6 and 16 characters OR exactly 24 characters:
+in `config.toml` you can add a list of regex patterns that stechuhr (*both on server and on client!*) uses to verify the Card IDs. The client will request the patterns from the server at start up and periodically thereafter (which allows you to use a server config to update these lists). These two patterns for example allow upper/lowercase hex strings with lengths either between 6 and 16 characters OR exactly 24 characters:
 
 ```toml
 id_patterns = [