Firmware: add ETL subcomponent

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "clock-pcb/vfd-lib"]
 	path = clock-pcb/vfd-lib
 	url = https://github.com/jh1995/KiCad-libs.git
+[submodule "firmware/components/etlcpp/etl"]
+	path = firmware/components/etlcpp/etl
+	url = https://github.com/ETLCPP/etl.git

firmware/components/etlcpp/CMakeLists.txt

@@ -0,0 +1 @@
+idf_component_register(INCLUDE_DIRS "include" "etl/include")

firmware/components/etlcpp/etl

@@ -0,0 +1 @@
+Subproject commit 0f1840a70d11a3d317afa55b8361829b93c8eeb8

firmware/components/etlcpp/include/etl_profile.h

@@ -0,0 +1,21 @@
+//
+// Created by erki on 13/01/24.
+//
+
+#ifndef ETL_COMPILER_H
+#define ETL_COMPILER_H
+
+#define ETL_COMPILER_GCC
+#define ETL_CPP23_SUPPORTED 1
+
+#if !defined(CONFIG_OPTIMIZATION_ASSERTIONS_ENABLED)
+#define ETL_NO_CHECKS
+#endif
+
+#if defined(CONFIG_CXX_EXCEPTIONS)
+#define ETL_THROW_EXCEPTIONS
+#endif
+
+#include "etl/profiles/gcc_generic.h"
+
+#endif // ETL_COMPILER_H

firmware/main/CMakeLists.txt

@@ -1,6 +1,6 @@
 idf_component_register(
         SRCS "main.cpp" "wifi_provisioner.cpp"
         INCLUDE_DIRS ""
-        REQUIRES nvs_flash esp_wifi esp_http_server
+        REQUIRES nvs_flash esp_wifi esp_http_server etlcpp
         EMBED_FILES "${CMAKE_CURRENT_LIST_DIR}/static/index.html"
 )

firmware/main/wifi_provisioner.cpp

@@ -9,6 +9,8 @@
 #include "esp_mac.h"
 #include "esp_log.h"
 
+#include <etl/string.h>
+
 #define TRY(x) ({ \
   const auto& _x = (x); \
   if (!_x) {       \
@@ -68,8 +70,35 @@ esp_err_t rootGetHandler_(httpd_req_t* req)
 
 esp_err_t rootPostHandler_(httpd_req_t* req)
 {
+  etl::string<1024> content;
+
+  content.initialize_free_space();
+  const std::size_t size = MIN(req->content_len, content.max_size() - 1);
+
+  if (const int ret = httpd_req_recv(req, content.data_end(), size);
+      ret <= 0)
+  {
+    if (ret == HTTPD_SOCK_ERR_TIMEOUT)
+      httpd_resp_send_408(req);
+
+    return ESP_FAIL;
+  }
+
+  content.trim_to_terminator();
+
+  etl::string<100> header;
+  if (const auto err = httpd_req_get_hdr_value_str(req, "Content-Type", header.data(), header.max_size() - 1);
+      err != ESP_OK)
+  {
+    ESP_LOGE(TAG, "Error reading content header.");
+    return ESP_FAIL;
+  }
 
   //httpd_query_key_value
+  ESP_LOGI(TAG, "Data from post: %s, %s", header.data(), content.data());
+
+  const char resp[] = "URI POST Response";
+  httpd_resp_send(req, resp, HTTPD_RESP_USE_STRLEN);
   return ESP_OK;
 }
 
@@ -171,6 +200,13 @@ std::expected<httpd_handle_t, esp_err_t> WifiProvisioner::initializeCaptivePorta
     .user_ctx = this
   };
 
+  static httpd_uri_t uri_post = {
+    .uri = "/configure",
+    .method = HTTP_POST,
+    .handler = rootPostHandler_,
+    .user_ctx = this
+  };
+
   if (const auto err = httpd_register_uri_handler(server, &uri_main);
       err != ESP_OK)
   {
@@ -178,5 +214,12 @@ std::expected<httpd_handle_t, esp_err_t> WifiProvisioner::initializeCaptivePorta
     return std::unexpected(err);
   }
 
+  if (const auto err = httpd_register_uri_handler(server, &uri_post);
+      err != ESP_OK)
+  {
+    httpd_stop(server);
+    return std::unexpected(err);
+  }
+
   return server;
 }