House alarm system based on ESP32

Copyright (c) 2017, 2018, 2019, 2020, 2021 by Danny Backx

This alarm system is designed to work with a bunch of similar controllers.
You can choose which hardware and capabilities go in each individual controller, and configure them accordingly.

The software needs a small amount of configuration to talk to the hardware.
With no configuration, the software will format a LittleFS partition, start an FTP server,
and you can use that to upload a file into /fs/config.json .

A sample content :

{ "name" : "prototype",
"haveOled" : true, "oledLedPin" : 5, "oledCSPin" : 17, "oledDCPin" : 16,
"run_ftp" : true, "ftp_user" : "me", "ftp_pass" : "myself",
"radioPin" : 22,
"sensors" :
{ "name" : "Hall motion", "id" : 0x00CD4FAA, "zone" : "secure" },
{ "name" : "Kitchen smoke", "id" : 0x004F55E8, "zone" : "always" },
{ "name" : "Upstairs smoke", "id" : 0x007DF9E8, "zone" : "always" }

}

It's obviously possible to turn off FTP to make the system less hackable, the flip side is that
recovery is harder.

This software should be built with ESP-IDF, the build environment recommended by Espressif.
Note : currently in the process of upgrading my environment to esp-idf-v4.3

Components required (you need to put these in components/) :
- arduino (https://github.com/espressif/arduino-esp32.git)
- littlefs (a simple filesystem superior to the well known spiffs, https://github.com/ARMmbed/littlefs.git)
- esp_littlefs (esp-idf integration for littlefs https://github.com/joltwallet/esp_littlefs.git)

Arduino libraries (these are already copied in libraries/) :
- TFT_eSPI (Bodmer's stuff with small changes)
- arduinojson
- rcswitch (optional, needed for radio hardware, e.g. for 433MHz sensors)
- rfid (optional)
- my own acmeclient (https://esp32-acme-client.sourceforge.io) (optional)
- QR code generation with the C version of https://www.nayuki.io/page/qr-code-generator-library (optional)

In the "make menuconfig -> Arduino", only the Arduino libraries ESP32, Wire and SPI are needed. Hence advice
to select "Include only specific Arduino libraries".

Hardware platform :
- ESP32 (esp8266 not supported any more)
- Some sensors with wireless RF communication
* https://www.aliexpress.com/item/Kerui-433MHz-Wireless-Intelligent-PIR-Sensor-Motion-Detector-For-GSM-PSTN-Security-Alarm-System-Auto-Dial/32566190623.html?spm=a2g0
s.9042311.0.0.04PnSB
* https://www.aliexpress.com/item/433MHz-Portable-Alarm-Sensors-Wireless-Fire-Smoke-Detector/32593947430.html?spm=a2g0s.9042311.0.0.04PnSB
- Keypads with touch displays
* https://www.aliexpress.com/item/1pcs-J34-F85-240x320-2-8-SPI-TFT-LCD-Touch-Panel-Serial-Port-Module-with-PCB/32795636902.html?spm=a2g0s.9042311.0.0.04PnSB
- RF receivers
* https://www.aliexpress.com/item/1set-2pcs-RF-wireless-receiver-module-transmitter-module-board-Ordinary-super-regeneration-433MHZ-DC5V-ASK-OOK/32606396563.html?spm
=a2g0s.9042311.0.0.04PnSB
- RFID card readers
* https://www.aliexpress.com/item/2pcs-lot-MFRC-522-RC522-RFID-Kits-S50-13-56-Mhz-With-Tags-SPI-Write-Read/32620671237.html?spm=a2g0s.9042311.0.0.tm7J7e
* https://www.aliexpress.com/item/PN532-NFC-RFID-Module-V3-Kits-Reader-Writer/32452824672.html?spm=a2g0s.9042311.0.0.XugjzW

I have a PCB design that can be used to build a controller module with minimal wiring.
See my project on easyeda.com, or the copy in pcb .
The v1 has one known bug : the radio data line should go to esp32 pin 27 instead of pin 22.

Note : you may need to set some parameters in "make menuconfig" to make this work
- CONFIG_SYSTEM_EVENT_TASK_STACK_SIZE=4304 (was 2304)
to prevent eventTask from running out of stack space
- CONFIG_FREERTOS_USE_TRACE_FACILITY=y if you want to be able to list the ESP32 tasks,
or their memory/stack usage
(menuconfig->Component config->FreeRTOS->Enable FreeRTOS trace facility)
- For mutual authentication to work (in WebServer.cpp and JsonServer.cpp) we need a patch
on esp-idf which is not yet in v4.3 at this time.