Utilize SPIFFS for serving the app with web-server

With this commit the webserver of the controller can serve a folder (/react-app/build/), when the ip is accessed in a web-browser.

Currently the react app is successfully served and the armchair can be controlled when in HTTP mode and connected via AP.

- CMakeLists: Add command that creates and flashes the spiffs partition when running
  idf.py flash
- main.cpp: Add function to initialize spiffs
- http.cpp: uncomment handler for default URL (accesses spiffs)
- Add partitions.csv: needed for the creation of spiffs.bin during
  compilation
- Add sdkconfig: It was necessary to change the FLASH_SIZE from 2MB to
  4MB. To avoid having the same trouble on other devices the sdkconfig
  is now added to the repository

main/CMakeLists.txt

@@ -1,2 +1,18 @@
-idf_component_register(SRCS "main.cpp" "motordrivers.cpp" "motorctl.cpp" "config.cpp" "joystick.cpp" "buzzer.cpp" "control.cpp" "button.cpp" "fan.cpp" "wifi.c" "http.cpp"
-                    INCLUDE_DIRS ".")
+idf_component_register(
+    SRCS 
+        "main.cpp"
+        "motordrivers.cpp"
+        "motorctl.cpp"
+        "config.cpp"
+        "joystick.cpp"
+        "buzzer.cpp"
+        "control.cpp"
+        "button.cpp"
+        "fan.cpp"
+        "wifi.c"
+        "http.cpp"
+    INCLUDE_DIRS 
+        "."
+    )
+
+spiffs_create_partition_image(spiffs ../react-app/build FLASH_IN_PROJECT)

main/http.cpp

@@ -190,11 +190,11 @@ void http_init_server()
       };
   httpd_register_uri_handler(server, &joystick_url);
 
-//  httpd_uri_t default_url = {
-//      .uri = "/*",
-//      .method = HTTP_GET,
-//      .handler = on_default_url};
-//  httpd_register_uri_handler(server, &default_url);
+  httpd_uri_t default_url = {
+      .uri = "/*",
+      .method = HTTP_GET,
+      .handler = on_default_url};
+  httpd_register_uri_handler(server, &default_url);
 
 //  httpd_uri_t socket_joystick_url = {
 //      .uri = "/ws-api/joystick",

main/main.cpp

@@ -9,6 +9,7 @@ extern "C"
 #include "driver/gpio.h"
 #include "esp_log.h"
 #include "sdkconfig.h"
+#include "esp_spiffs.h"    
 
 #include "driver/ledc.h"
 
@@ -99,6 +100,29 @@ void task_fans( void * pvParameters ){
 
 
 
+//=================================
+//========== init spiffs ==========
+//=================================
+//initialize spi flash filesystem (used for webserver)
+void init_spiffs(){
+    ESP_LOGI(TAG, "init spiffs");
+    esp_vfs_spiffs_conf_t esp_vfs_spiffs_conf = {
+        .base_path = "/spiffs",
+        .partition_label = NULL,
+        .max_files = 5,
+        .format_if_mount_failed = true};
+    esp_vfs_spiffs_register(&esp_vfs_spiffs_conf);
+
+    size_t total = 0;
+    size_t used = 0;
+    esp_spiffs_info(NULL, &total, &used);
+
+    ESP_LOGI(TAG, "SPIFFS: total %d, used %d", total, used);
+    esp_vfs_spiffs_unregister(NULL);
+}
+
+
+
 //=================================
 //=========== app_main ============
 //=================================
@@ -167,6 +191,8 @@ extern "C" void app_main(void) {
     //--- initialize nvs-flash and netif (needed for wifi) ---
     wifi_initNvs_initNetif();
 
+    //--- initialize spiffs ---
+    init_spiffs();
 
     //--- initialize and start wifi ---
     //FIXME: run wifi_init_client or wifi_init_ap as intended from control.cpp when switching state 

partitions.csv

@@ -0,0 +1,6 @@
+# Name,   Type, SubType, Offset,  Size, Flags
+# Note: if you have increased the bootloader size, make sure to update the offsets to avoid overlap
+nvs,      data, nvs,     ,        0x6000,
+phy_init, data, phy,     ,        0x1000,
+factory,  app,  factory, ,        1M,
+spiffs,   data, spiffs,  ,        1M