Hardware Timer didnt work https://github.com/khoih-prog/ESP8266TimerInterrupt#why-using-isr-based-hardware-timer-interrupt-is-better

=> Software Timer https://ullisroboterseite.de/esp8266-timing.html#timer




### __Zum aktivieren von GDBStub:__
```c
#include <GDBStub.h>

...

void setup() {
  Serial.begin(460800);
  gdbstub_init();
```

### __Achtung !__
GDB muss dafür compiled werden
GDB-Version aus Arduino Toolchain hat Support

```sh
$ ./start_xtensa_gdb_stub.sh
```

### __Achtung !__
Don`t forget __\r__

ESP-OTA wird von ufw oder Defender geblockt.
- Windows -> Python needs to be granted with rights
- Linux -> open udp port in ufw -> 

```sh
platform.ini 
upload_flags =
  --host-port <PORT>
...
$ sudo ufw allow tcp/<PORT>
```


```c++
server.streamFile(f, mime::getContentType(SRH::_path), requestMethod);

=====>

const String& p = SRH::_path;
if(p.endsWith(".gzip")) {
    server.sendHeader("Content-Encoding", "gzip");
    server.streamFile(f, mime::getContentType(p.substring(0, p.length()-5)), requestMethod);
}
else
    server.streamFile(f, mime::getContentType(SRH::_path), requestMethod);
```

### HW issues
- GPIO2 used as input -> must be high during startup
- PCB Solution: cut trace to GPIO2, solder bridge to GPIO16
- -> disadvantage: GPIO16 is not interrupt capable


### FSM 2 - to do
- stairway light switches off after timeout
- switches concurrently on again if sensor is still high
- desired behavior? Defective Sensor would cause continuos animation
- edge detection / interrupts as solution ?


### LED_sequence_v1:
TODO: 
- disable led stripes after defined time (webserver paramter?)
- define what to do if people enter stairs from different directions
- CAUTION: Sensor-Deadtime at LEAST 8 seconds
- --> switch off with person leaving stairs might not be possible

### Webserver on v0.3.0 now working with LittleFS
TODO:
- check dir for files automatic
- move handleNotFound to httpserver.h
- maybe compress files ?


### LED Flickering issue
https://github.com/NachtRaveVL/PCA9685-Arduino/issues/15
PlatformIO Library veraltet !!


### TIMER in OTA unterbrechen !!!!!



### further improvments
with streamFile gzip encoded Files can be sent
this reduces space on fs !
new easier script needed to just convert to .gz
maybe measure timings on ESP

__=> use serveStatic because way simpler !__
__=> serverStatic("/") works wonders__


AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAARHRRHRGH
Two implementations of FSM are not that good,
linker puts them together ?!?
:):):):):):):)
=> maybe investigate for doc

### TODO Treppe
- dynamic lighting with ldr
- http control over active pwm ... => set_active_pwm()
  -> is implemntiert, kann mit % oder abs eingestellt werden
- testing if dimming crashes when two animations
  -> ldr does not interrupt animation, animation get's finished and stairs fade out -> FSM works without collisions
- interrupt to pending from sensors
  -> rising edge trigger implemented, via pending input
- settings struct
  -> implemented with EEPROM
  -> adapted to only change on ruhezustand
- script for gdb on windows
  -> [implemented](start_xtensa_gdb_stub.cmd)
- welcome animation ?
  -> wird hochgedimmt beim einschalten von 0
- on/off switch http
- use logging to serial http monitor with httpserver.logt()
  -> is used for some status updates

- behavior when someone enters stairway from opposite direction while animation is running?
  -> currently ignored, second persons walks in darkness
  -> animation from both sides?
  -> problem: person 1 leaving stairway might pass the sensor right after person 2 -> person 1 leaving not detected

- behavior when someone enters stairway from opposite direction after animation finished but person 1 is still on stairway?
  -> currently stairs fade off from direction 1
  -> additional wait-state between "warten hoch/runter" and "abdimmen hoch/runter" after sensor detected person?


- active brightness can be lower than idle in the moment
- change idle to precentage of active !!!