Switched to queues for webserver

src/main.cpp

@@ -1,7 +1,6 @@
 #include "SPIFFS.h"
 #include <Arduino.h>
 #include <AsyncTCP.h>
-#include <ESPAsyncWebServer.h>
 #include <ETH.h>
 #include <WiFi.h>
 #include <HTTPUpdate.h>
@@ -15,6 +14,7 @@
 #include "global_data/defines.h"
 
 #include "networking/networking.h"
+#include "networking/webserver.h"
 
 #include "external_interfacing/leds.h"
 #include "sensor/sensor.h"
@@ -22,7 +22,6 @@
 #include "tools/tools.h"
 #include <Preferences.h>
 #include "networking/json_builder.h"
-#include "networking/responses.h"
 #include <fetchOTA.h>
 #include "time.h"
 #include "tools/log.h"
@@ -32,17 +31,16 @@
 
 Preferences prefs;
 
-extern WaterData water_data;
 extern DeviceTelemetry telemetry;
 extern NetworkData wifi_data;
 extern NetworkData ethernet_data;
 extern SensorData shunt_data;
 extern ActiveErrors active_errors;
 
+extern AsyncWebSocket webSocket;
+
 Version current_spiffs_version;
 
-AsyncWebServer server(80);
-AsyncWebSocket webSocket("/webSocket");
 #define FORMAT_LITTLEFS_IF_FAILED true
 
 void setup()
@@ -78,85 +76,6 @@ void setup()
     /////////////////////////////// ROUTES ///////////////////////////////
     LOG(ELOG_LEVEL_DEBUG, "Route Setup");
 
-    // Normal HTML stuff
-    server.on("/", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/status.html", "text/html", false, processor); });
-
-    server.on("/settings", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/settings.html", "text/html", false, processor); });
-
-    server.on("/export", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/data_export.html", "text/html", false); });
-
-    server.on("/logic.js", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/logic.js", "application/javascript", false, processor); });
-
-    server.on("/update", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/update_progress.html", "text/html", false, processor); });
-
-    // API stuff - internal
-    server.on("/update_wifi_credentials", HTTP_POST, [](AsyncWebServerRequest* request) {
-        // For settings SSID
-        if (request->hasParam(ssid_key, true) && request->hasParam(wifi_password_key, true)) {
-            LOG(ELOG_LEVEL_DEBUG, "Updating SSID config");
-            const AsyncWebParameter* ssid_param = request->getParam(ssid_key, true);
-            const AsyncWebParameter* password_param = request->getParam(wifi_password_key, true);
-            prefs.putString(ssid_key, ssid_param->value().c_str());
-            prefs.putString(wifi_password_key, password_param->value().c_str());
-
-        } else {
-            request->send(400, "text/plain", "Missing parameters"); // TODO add proper error messages
-        }
-        request->send(LittleFS, "/settings.html", "text/html", false, processor); // TODO add proper return templating
-    });
-
-    server.on("/update_sensor_settings", HTTP_POST, [](AsyncWebServerRequest* request) {
-        int params = request->params();
-
-        if (request->hasParam(level_sensor_range_key, true) && request->hasParam(water_level_min_key, true) && request->hasParam(water_level_max_key, true) && request->hasParam(water_volume_key, true)) {
-            LOG(ELOG_LEVEL_DEBUG, "Updating Sensor config");
-            const AsyncWebParameter* range_param = request->getParam(level_sensor_range_key, true);
-            const AsyncWebParameter* level_min_param = request->getParam(water_level_min_key, true);
-            const AsyncWebParameter* level_max_param = request->getParam(water_level_max_key, true);
-            const AsyncWebParameter* liters_param = request->getParam(water_volume_key, true);
-
-            String range_str = range_param->value();
-            String level_min_str = level_min_param->value();
-            String level_max_str = level_max_param->value();
-            String liters_str = liters_param->value();
-
-            float range_float = range_str.toFloat();
-            float level_min_float = level_min_str.toFloat();
-            float level_max_float = level_max_str.toFloat();
-            float liters_float = liters_str.toFloat();
-
-            LOG(ELOG_LEVEL_DEBUG, "range_float:%D:", range_float);
-
-            prefs.putFloat(level_sensor_range_key, range_float);
-            prefs.putFloat(water_level_min_key, level_min_float);
-            prefs.putFloat(water_level_max_key, level_max_float);
-            prefs.putFloat(water_volume_key, liters_float);
-
-            LOG(ELOG_LEVEL_DEBUG, "range_float_after:%D:", prefs.getFloat(level_sensor_range_key, -1.0));
-        } else {
-            LOG(ELOG_LEVEL_DEBUG, "!!!! FAIL lo");
-            for (int i = 0; i < params; i++) {
-                const AsyncWebParameter* p = request->getParam(i);
-                if (p->isFile()) { // p->isPost() is also true
-                    LOG(ELOG_LEVEL_DEBUG, "POST[%s]: %s\n", p->name().c_str(), p->value().c_str());
-                } else if (p->isPost()) {
-                    LOG(ELOG_LEVEL_DEBUG, "POST[%s]: %s\n", p->name().c_str(), p->value().c_str());
-                } else {
-                    LOG(ELOG_LEVEL_DEBUG, "GET[%s]: %s\n", p->name().c_str(), p->value().c_str());
-                }
-            }
-            request->send(400, "text/plain", "Missing parameters"); // TODO add proper error messages
-        }
-        request->send(LittleFS, "/settings.html", "text/html", false); // TODO add proper return templating
-    });
-    
-    setup_api_endpoints();
-    webSocket.onEvent(onWsEvent);
-    server.addHandler(&webSocket);
-
-    server.on("/chota.css", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/chota.css", "text/css", false); });
-    server.on("/gauge.js", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/gauge.js", "application/javascript", false); });
-
 
     LOG(ELOG_LEVEL_DEBUG, "OTA Setup");
     ArduinoOTA
@@ -181,23 +100,31 @@ void setup()
 
 
     LOG(ELOG_LEVEL_DEBUG, "Starting main tasks");
-    xTaskCreate(ethernet_task, "EthernetTask", 4096, NULL, 1, NULL);
-    xTaskCreate(wifi_task, "WiFiTask", 10000, NULL, 1, NULL);
-    xTaskCreate(read_sensor_task, "ReadSensorTask", 1024 * 4, NULL, 1, NULL);
-    xTaskCreate(collect_internal_telemetry_task, "InternalTelemetryTask", 2048, NULL, 1, NULL);
-    xTaskCreate(display_task, "DisplayTask", 10000, NULL, 1, NULL);
-    xTaskCreate(get_time_task, "GetTimeTask", 1024 * 4, NULL, 1, NULL);
     
-    delay(5000);
+    // Create a queue for water data communication between sensor and webserver tasks
-    xTaskCreate(check_update_task, "CheckUpdateTask", 1024 * 8, NULL, 1, NULL);
+    QueueHandle_t webserverWaterDataQueue = xQueueCreate(10, sizeof(WaterData));
+    if (webserverWaterDataQueue == NULL) {
+        LOG(ELOG_LEVEL_ERROR, "Failed to create webserver water data queue");
+    } else {
+        xTaskCreate(ethernet_task, "EthernetTask", 4096, NULL, 1, NULL);
+        xTaskCreate(wifi_task, "WiFiTask", 10000, NULL, 1, NULL);
+        xTaskCreate(read_sensor_task, "ReadSensorTask", 1024 * 4, webserverWaterDataQueue, 1, NULL);
+        xTaskCreate(collect_internal_telemetry_task, "InternalTelemetryTask", 2048, NULL, 1, NULL);
+        xTaskCreate(display_task, "DisplayTask", 10000, NULL, 1, NULL);
+        xTaskCreate(get_time_task, "GetTimeTask", 1024 * 4, NULL, 1, NULL);
+
+        delay(5000);
+        xTaskCreate(check_update_task, "CheckUpdateTask", 1024 * 8, NULL, 1, NULL);
+        xTaskCreate(webserver_task, "WebServerTask", 1024 * 8, webserverWaterDataQueue, 1, NULL);
+    }
 
-    LOG(ELOG_LEVEL_DEBUG, "Starting webserver");
-    server.begin();
     LOG(ELOG_LEVEL_DEBUG, "Starting OTA handler");
     ArduinoOTA.begin();
 }
 
 
+
+
 void loop()
 {
     ArduinoOTA.handle();

src/networking/json_builder.cpp

@@ -1,7 +1,6 @@
 #include "json_builder.h"
 #include <Elog.h>
 
-extern WaterData water_data;
 extern DeviceTelemetry telemetry;
 extern NetworkData wifi_data;
 extern NetworkData ethernet_data;

src/networking/responses.cpp

@@ -1,76 +0,0 @@
-#include "responses.h"
-
-#include <Arduino.h>
-#include <ESPAsyncWebServer.h>
-#include "AsyncJson.h"
-#include <ArduinoJson.h>
-#include <Elog.h>
-#include "json_builder.h"
-#include "../tools/tools.h"
-#include <SPIFFS.h>
-
-extern WaterData water_data;
-extern DeviceTelemetry telemetry;
-extern NetworkData wifi_data;
-extern NetworkData ethernet_data;
-extern SensorData shunt_data;
-extern OTAStatus ota_status;
-
-extern AsyncWebServer server;
-
-void setup_api_endpoints(){
-    server.on("/sensor_data", HTTP_GET, [](AsyncWebServerRequest* request) {
-      String output;
-      serializeJson(build_shunt_data_json(shunt_data), output);
-      request->send(200, "application/json", output); });
-
-    server.on("/water_data", HTTP_GET, [](AsyncWebServerRequest* request) {
-      String output;
-      serializeJson(build_water_data_json(water_data), output);
-      request->send(200, "application/json", output); });
-
-    server.on("/raw_percent", HTTP_GET, [](AsyncWebServerRequest* request) {
-      String output;
-      output = water_data.percentage;
-      request->send(200, "text/raw", output); });
-
-    server.on("/raw_level", HTTP_GET, [](AsyncWebServerRequest* request) {
-      String output;
-      output = water_data.level;
-      request->send(200, "text/raw", output); });
-  
-
-    server.on("/telemetry", HTTP_GET, [](AsyncWebServerRequest* request) {
-      String output;
-      serializeJson(build_telemetry_json(telemetry), output);
-      request->send(200, "application/json", output); });
-
-    server.on("/network_info", HTTP_GET, [](AsyncWebServerRequest* request) {
-        String output;
-        serializeJson(build_network_json(ethernet_data, wifi_data), output);
-        request->send(200, "application/json", output);
-    });
-
-    server.on("/ota_update_status", HTTP_GET, [](AsyncWebServerRequest* request) {
-      String output;
-      serializeJson(build_ota_json(ota_status), output);
-      request->send(200, "application/json", output);
-    });
-
-    server.on("/run_ota_update", HTTP_GET, [](AsyncWebServerRequest* request) {
-      if (ota_status.update_progress > -1) {
-        request->send(200, "text/plain", "OTA Update already in progress");
-        return;
-      } else if (!ota_status.update_available) {
-        request->send(200, "text/plain", "No update available");
-        return;
-      }
-
-      static TaskArgs_t args = {
-        .ota_status = ota_status
-      };
-
-      xTaskCreate(run_ota_update_task, "RunOTAUpdate", 1024 * 8, (void *)&args, 1, NULL);
-      request->send(LittleFS, "/update_progress.html", "text/html", false, processor);
-    });
-}

src/networking/responses.h

@@ -1,4 +0,0 @@
-#include <ESPAsyncWebServer.h>
-#include <LittleFS.h>
-
-void setup_api_endpoints();

src/networking/webserver.cpp

@@ -0,0 +1,284 @@
+#include "webserver.h"
+
+#include <Arduino.h>
+#include <ESPAsyncWebServer.h>
+#include <LittleFS.h>
+#include <Elog.h>
+#include <AsyncTCP.h>
+#include <Preferences.h>
+#include "tools/log.h"
+#include "AsyncJson.h"
+#include <ArduinoJson.h>
+#include <SPIFFS.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/semphr.h>
+#include <freertos/queue.h>
+
+#include "../global_data/global_data.h"
+#include "../tools/tools.h"
+#include "../tools/readers_writer_lock.h"
+#include "../global_data/defines.h"
+#include "json_builder.h"
+
+extern Preferences prefs;
+extern DeviceTelemetry telemetry;
+extern NetworkData wifi_data;
+extern NetworkData ethernet_data;
+extern SensorData shunt_data;
+extern OTAStatus ota_status;
+
+AsyncWebSocket webSocket("/webSocket");
+AsyncWebServer server(80);
+
+// Local water data cache
+WaterData local_water_data;
+
+// Readers-writer lock for local_water_data
+ReadersWriterLock waterDataLock;
+
+// Queue to receive water data from the sensor task
+QueueHandle_t webserverWaterDataQueue;
+
+
+// ======================
+// Webserver Setup
+// ======================
+
+/**
+ * @brief Sets up all routes for the webserver.
+ * 
+ * Configures routes for serving HTML pages, handling form submissions,
+ * REST API endpoints, WebSocket connections, and static assets.
+ * 
+ * @note Calls setup_api_endpoints() to configure API-specific routes.
+ */
+void setup_routes() {
+    server.on("/", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/status.html", "text/html", false, processor); });
+
+    server.on("/settings", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/settings.html", "text/html", false, processor); });
+
+    server.on("/export", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/data_export.html", "text/html", false); });
+
+    server.on("/logic.js", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/logic.js", "application/javascript", false, processor); });
+
+    server.on("/update", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/update_progress.html", "text/html", false, processor); });
+
+    // API stuff - internal
+    server.on("/update_wifi_credentials", HTTP_POST, [](AsyncWebServerRequest* request) {
+        handle_update_wifi_credentials(request);
+    });
+
+    server.on("/update_sensor_settings", HTTP_POST, [](AsyncWebServerRequest* request) {
+        handle_update_sensor_settings(request);
+    });
+    
+    setup_api_endpoints();
+    webSocket.onEvent(onWsEvent);
+    server.addHandler(&webSocket);
+
+    server.on("/chota.css", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/chota.css", "text/css", false); });
+    server.on("/gauge.js", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/gauge.js", "application/javascript", false); });
+}
+
+/**
+ * @brief Configures REST API endpoints for data retrieval.
+ * 
+ * Sets up endpoints to fetch sensor data, water data, telemetry,
+ * network information, and OTA update status in JSON format.
+ * 
+ * @note These endpoints are used by the frontend to dynamically
+ *       display device status and configuration.
+ */
+void setup_api_endpoints(){
+    server.on("/sensor_data", HTTP_GET, [](AsyncWebServerRequest* request) {
+      String output;
+      serializeJson(build_shunt_data_json(shunt_data), output);
+      request->send(200, "application/json", output); });
+
+    server.on("/water_data", HTTP_GET, [](AsyncWebServerRequest* request) {
+      rwLockAcquireRead(&waterDataLock);
+      String output;
+      serializeJson(build_water_data_json(local_water_data), output);
+      rwLockReleaseRead(&waterDataLock);
+      request->send(200, "application/json", output);
+    });
+
+    server.on("/raw_percent", HTTP_GET, [](AsyncWebServerRequest* request) {
+      rwLockAcquireRead(&waterDataLock);
+      String output = String(local_water_data.percentage);
+      rwLockReleaseRead(&waterDataLock);
+      request->send(200, "text/raw", output);
+    });
+
+    server.on("/raw_level", HTTP_GET, [](AsyncWebServerRequest* request) {
+      rwLockAcquireRead(&waterDataLock);
+      String output = String(local_water_data.level);
+      rwLockReleaseRead(&waterDataLock);
+      request->send(200, "text/raw", output);
+    });
+  
+    server.on("/telemetry", HTTP_GET, [](AsyncWebServerRequest* request) {
+      String output;
+      serializeJson(build_telemetry_json(telemetry), output);
+      request->send(200, "application/json", output); });
+
+    server.on("/network_info", HTTP_GET, [](AsyncWebServerRequest* request) {
+        String output;
+        serializeJson(build_network_json(ethernet_data, wifi_data), output);
+        request->send(200, "application/json", output);
+    });
+
+    server.on("/ota_update_status", HTTP_GET, [](AsyncWebServerRequest* request) {
+      String output;
+      serializeJson(build_ota_json(ota_status), output);
+      request->send(200, "application/json", output);
+    });
+
+    server.on("/run_ota_update", HTTP_GET, [](AsyncWebServerRequest* request) {
+      if (ota_status.update_progress > -1) {
+        request->send(200, "text/plain", "OTA Update already in progress");
+        return;
+      } else if (!ota_status.update_available) {
+        request->send(200, "text/plain", "No update available");
+        return;
+      }
+
+      static TaskArgs_t args = {
+        .ota_status = ota_status
+      };
+
+      xTaskCreate(run_ota_update_task, "RunOTAUpdate", 1024 * 8, (void *)&args, 1, NULL);
+      request->send(LittleFS, "/update_progress.html", "text/html", false, processor);
+    });
+}
+
+// ======================
+// Helper Functions
+// ======================
+
+/**
+ * @brief Handles the update of WiFi credentials.
+ * 
+ * Validates and updates the SSID and password in preferences.
+ * 
+ * @param request The web server request object.
+ */
+void handle_update_wifi_credentials(AsyncWebServerRequest* request) {
+    if (request->hasParam(ssid_key, true) && request->hasParam(wifi_password_key, true)) {
+        LOG(ELOG_LEVEL_DEBUG, "Updating SSID config");
+        const AsyncWebParameter* ssid_param = request->getParam(ssid_key, true);
+        const AsyncWebParameter* password_param = request->getParam(wifi_password_key, true);
+        prefs.putString(ssid_key, ssid_param->value().c_str());
+        prefs.putString(wifi_password_key, password_param->value().c_str());
+    } else {
+        request->send(400, "text/plain", "Missing parameters");
+        return;
+    }
+    request->send(LittleFS, "/settings.html", "text/html", false, processor);
+}
+
+/**
+ * @brief Handles the update of sensor settings.
+ * 
+ * Validates and updates sensor configuration parameters in preferences.
+ * 
+ * @param request The web server request object.
+ */
+void handle_update_sensor_settings(AsyncWebServerRequest* request) {
+    int params = request->params();
+
+    if (request->hasParam(level_sensor_range_key, true) && request->hasParam(water_level_min_key, true) && 
+        request->hasParam(water_level_max_key, true) && request->hasParam(water_volume_key, true)) {
+        LOG(ELOG_LEVEL_DEBUG, "Updating Sensor config");
+        const AsyncWebParameter* range_param = request->getParam(level_sensor_range_key, true);
+        const AsyncWebParameter* level_min_param = request->getParam(water_level_min_key, true);
+        const AsyncWebParameter* level_max_param = request->getParam(water_level_max_key, true);
+        const AsyncWebParameter* liters_param = request->getParam(water_volume_key, true);
+
+        String range_str = range_param->value();
+        String level_min_str = level_min_param->value();
+        String level_max_str = level_max_param->value();
+        String liters_str = liters_param->value();
+
+        float range_float = range_str.toFloat();
+        float level_min_float = level_min_str.toFloat();
+        float level_max_float = level_max_str.toFloat();
+        float liters_float = liters_str.toFloat();
+
+        LOG(ELOG_LEVEL_DEBUG, "range_float:%D:", range_float);
+
+        prefs.putFloat(level_sensor_range_key, range_float);
+        prefs.putFloat(water_level_min_key, level_min_float);
+        prefs.putFloat(water_level_max_key, level_max_float);
+        prefs.putFloat(water_volume_key, liters_float);
+
+        LOG(ELOG_LEVEL_DEBUG, "range_float_after:%D:", prefs.getFloat(level_sensor_range_key, -1.0));
+    } else {
+        LOG(ELOG_LEVEL_DEBUG, "!!!! FAIL lo");
+        for (int i = 0; i < params; i++) {
+            const AsyncWebParameter* p = request->getParam(i);
+            if (p->isFile()) {
+                LOG(ELOG_LEVEL_DEBUG, "POST[%s]: %s\n", p->name().c_str(), p->value().c_str());
+            } else if (p->isPost()) {
+                LOG(ELOG_LEVEL_DEBUG, "POST[%s]: %s\n", p->name().c_str(), p->value().c_str());
+            } else {
+                LOG(ELOG_LEVEL_DEBUG, "GET[%s]: %s\n", p->name().c_str(), p->value().c_str());
+            }
+        }
+        request->send(400, "text/plain", "Missing parameters");
+        return;
+    }
+    request->send(LittleFS, "/settings.html", "text/html", false);
+}
+
+/**
+ * @brief Main task for the webserver.
+ * 
+ * Initializes all routes, starts the webserver, and sets up local water data.
+ * Receives water data from the sensor task via a queue and updates local_water_data.
+ * Runs indefinitely to keep the server active.
+ * 
+ * @param pvParameters Task parameters (expected to be a QueueHandle_t for the water data queue).
+ */
+void webserver_task(void *pvParameters) {
+    // Extract the queue handle from the task parameters
+    webserverWaterDataQueue = (QueueHandle_t)pvParameters;
+    if (webserverWaterDataQueue == NULL) {
+        LOG(ELOG_LEVEL_ERROR, "Webserver water data queue is NULL");
+        vTaskDelete(NULL);
+        return;
+    }
+    
+    LOG(ELOG_LEVEL_DEBUG, "Setting up routes");
+    setup_routes();
+    
+    // Initialize the readers-writer lock
+    if (!rwLockInit(&waterDataLock)) {
+        LOG(ELOG_LEVEL_ERROR, "Failed to initialize readers-writer lock");
+        vTaskDelete(NULL);
+        return;
+    }
+    
+    // Initialize local water data with static values
+    rwLockAcquireWrite(&waterDataLock);
+    local_water_data.level = 50.0f;
+    local_water_data.liters = 100.0f;
+    local_water_data.percentage = 50.0f;
+    rwLockReleaseWrite(&waterDataLock);
+    
+    LOG(ELOG_LEVEL_DEBUG, "Starting webserver");
+    server.begin();
+    
+    while (1) {
+        // Check if there is new water data in the queue
+        WaterData newWaterData;
+        if (xQueueReceive(webserverWaterDataQueue, &newWaterData, 0) == pdTRUE) {
+            // Update local_water_data with the new data from the queue
+            rwLockAcquireWrite(&waterDataLock);
+            local_water_data = newWaterData;
+            rwLockReleaseWrite(&waterDataLock);
+        }
+        
+        vTaskDelay(100 / portTICK_PERIOD_MS); // Small delay to reduce CPU usage
+    }
+}

src/networking/webserver.h

@@ -0,0 +1,16 @@
+#ifndef ASYNC_WEBSERVER_H
+#define ASYNC_WEBSERVER_H
+
+#include <ESPAsyncWebServer.h>
+#include <LittleFS.h>
+
+extern AsyncWebServer server;
+
+void setup_api_endpoints();
+void setup_routes();
+void webserver_task(void *pvParameters);
+void handle_update_wifi_credentials(AsyncWebServerRequest* request);
+void handle_update_sensor_settings(AsyncWebServerRequest* request);
+
+#endif // ASYNC_WEBSERVER_H
+

src/sensor/sensor.cpp

@@ -3,6 +3,7 @@
 #include <Elog.h>
 #include "Wire.h"
 #include "../global_data/global_data.h"
+#include "../networking/webserver.h"
 
 
 #ifdef USE_INA226
@@ -47,6 +48,14 @@ void init_sensor(){
 
 void read_sensor_task(void* parameter)
 {
+    // Extract the queue handle from the task parameters
+    QueueHandle_t webserverWaterDataQueue = (QueueHandle_t)parameter;
+    if (webserverWaterDataQueue == NULL) {
+        LOG(ELOG_LEVEL_ERROR, "Webserver water data queue is NULL");
+        vTaskDelete(NULL);
+        return;
+    }
+    
     LOG(ELOG_LEVEL_DEBUG, "Starting read sensor tasks");
     while (true) {
         // Get Values from sensor
@@ -111,6 +120,11 @@ void read_sensor_task(void* parameter)
         water_data.liters = liters;
         water_data.percentage = percentage_rounded;
 
+        // Send the water data to the webserver task via the queue
+        if (xQueueSend(webserverWaterDataQueue, &water_data, 0) != pdTRUE) {
+            LOG(ELOG_LEVEL_ERROR, "Failed to send water data to webserver queue");
+        }
+
         delay(20000);
     }
 }

src/tools/readers_writer_lock.cpp

@@ -0,0 +1,70 @@
+#include "readers_writer_lock.h"
+#include <freertos/task.h>
+
+bool rwLockInit(ReadersWriterLock* rwLock) {
+    if (rwLock == NULL) {
+        return false;
+    }
+    
+    rwLock->mutex = xSemaphoreCreateMutex();
+    if (rwLock->mutex == NULL) {
+        return false;
+    }
+    
+    rwLock->readersCount = 0;
+    rwLock->writerActive = false;
+    
+    return true;
+}
+
+void rwLockAcquireRead(ReadersWriterLock* rwLock) {
+    if (rwLock == NULL) {
+        return;
+    }
+    
+    xSemaphoreTake(rwLock->mutex, portMAX_DELAY);
+    // Wait until no writer is active
+    while (rwLock->writerActive) {
+        xSemaphoreGive(rwLock->mutex);
+        vTaskDelay(10 / portTICK_PERIOD_MS); // Small delay to avoid busy-waiting
+        xSemaphoreTake(rwLock->mutex, portMAX_DELAY);
+    }
+    rwLock->readersCount++;
+    xSemaphoreGive(rwLock->mutex);
+}
+
+void rwLockReleaseRead(ReadersWriterLock* rwLock) {
+    if (rwLock == NULL) {
+        return;
+    }
+    
+    xSemaphoreTake(rwLock->mutex, portMAX_DELAY);
+    rwLock->readersCount--;
+    xSemaphoreGive(rwLock->mutex);
+}
+
+void rwLockAcquireWrite(ReadersWriterLock* rwLock) {
+    if (rwLock == NULL) {
+        return;
+    }
+    
+    xSemaphoreTake(rwLock->mutex, portMAX_DELAY);
+    // Set the writer active flag to block new readers
+    rwLock->writerActive = true;
+    // Wait until no readers are active
+    while (rwLock->readersCount > 0) {
+        xSemaphoreGive(rwLock->mutex);
+        vTaskDelay(10 / portTICK_PERIOD_MS); // Small delay to avoid busy-waiting
+        xSemaphoreTake(rwLock->mutex, portMAX_DELAY);
+    }
+    // Writer now has exclusive access
+}
+
+void rwLockReleaseWrite(ReadersWriterLock* rwLock) {
+    if (rwLock == NULL) {
+        return;
+    }
+    
+    rwLock->writerActive = false;
+    xSemaphoreGive(rwLock->mutex);
+}

src/tools/readers_writer_lock.h

@@ -0,0 +1,65 @@
+#ifndef READERS_WRITER_LOCK_H
+#define READERS_WRITER_LOCK_H
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/semphr.h>
+
+/**
+ * @brief Readers-Writer Lock structure.
+ * 
+ * This structure holds the state for a readers-writer lock,
+ * allowing multiple readers or a single writer to access a shared resource.
+ */
+typedef struct {
+    SemaphoreHandle_t mutex;   /**< Mutex to protect the lock state. */
+    int readersCount;         /**< Number of active readers. */
+    bool writerActive;        /**< Flag to indicate if a writer is active. */
+} ReadersWriterLock;
+
+/**
+ * @brief Initialize a readers-writer lock.
+ * 
+ * Initializes the mutex and sets the initial state of the lock.
+ * 
+ * @param rwLock Pointer to the ReadersWriterLock structure to initialize.
+ * @return true if initialization succeeded, false otherwise.
+ */
+bool rwLockInit(ReadersWriterLock* rwLock);
+
+/**
+ * @brief Acquire a read lock.
+ * 
+ * Blocks if a writer is active, otherwise allows multiple readers to access the data simultaneously.
+ * 
+ * @param rwLock Pointer to the ReadersWriterLock structure.
+ */
+void rwLockAcquireRead(ReadersWriterLock* rwLock);
+
+/**
+ * @brief Release a read lock.
+ * 
+ * Decrements the readers count.
+ * 
+ * @param rwLock Pointer to the ReadersWriterLock structure.
+ */
+void rwLockReleaseRead(ReadersWriterLock* rwLock);
+
+/**
+ * @brief Acquire a write lock.
+ * 
+ * Blocks until all readers have finished and sets the writer active flag.
+ * 
+ * @param rwLock Pointer to the ReadersWriterLock structure.
+ */
+void rwLockAcquireWrite(ReadersWriterLock* rwLock);
+
+/**
+ * @brief Release a write lock.
+ * 
+ * Clears the writer active flag and allows readers and writers.
+ * 
+ * @param rwLock Pointer to the ReadersWriterLock structure.
+ */
+void rwLockReleaseWrite(ReadersWriterLock* rwLock);
+
+#endif // READERS_WRITER_LOCK_H